Adding int-to-object map implementation.
Motivation: Maps with integer keys are used in several places (HTTP/2 code, for example). To reduce the memory footprint of these structures, we need a specialized map class that uses ints as keys. Modifications: Added IntObjectHashMap, which is uses open addressing and double hashing for collision resolution. Result: A new int-based map class that can be shared across Netty.
This commit is contained in:
nmittler
Norman Maurer
parent
f67ac5e46d
commit
02a6dc8ba7
@ -0,0 +1,483 @@
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/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License, version 2.0 (the
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* "License"); you may not use this file except in compliance with the License. You may obtain a
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* copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the License
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* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing permissions and limitations under
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* the License.
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*/
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package io.netty.util.collection;
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import java.lang.reflect.Array;
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import java.util.Arrays;
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import java.util.Iterator;
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import java.util.NoSuchElementException;
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/**
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* A hash map implementation of {@link IntObjectMap} that uses open addressing for keys. To minimize
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* the memory footprint, this class uses open addressing rather than chaining. Collisions are
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* resolved using double hashing.
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*
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* @param <V> The value type stored in the map.
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*/
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public class IntObjectHashMap<V> implements IntObjectMap<V>, Iterable<IntObjectMap.Entry<V>> {
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/** State indicating that a slot is available.*/
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private static final byte AVAILABLE = 0;
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/** State indicating that a slot is occupied. */
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private static final byte OCCUPIED = 1;
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/** State indicating that a slot was removed. */
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private static final byte REMOVED = 2;
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/** Default initial capacity. Used if not specified in the constructor */
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private static final int DEFAULT_CAPACITY = 11;
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/** Default load factor. Used if not specified in the constructor */
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private static final float DEFAULT_LOAD_FACTOR = 0.5f;
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/** The maximum number of elements allowed without allocating more space. */
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private int maxSize;
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/** The load factor for the map. Used to calculate {@link maxSize}. */
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private final float loadFactor;
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private byte[] states;
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private int[] keys;
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private V[] values;
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private int size;
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private int available;
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public IntObjectHashMap() {
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this(DEFAULT_CAPACITY, DEFAULT_LOAD_FACTOR);
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}
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public IntObjectHashMap(int initialCapacity) {
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this(initialCapacity, DEFAULT_LOAD_FACTOR);
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}
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public IntObjectHashMap(int initialCapacity, float loadFactor) {
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if (initialCapacity < 1) {
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throw new IllegalArgumentException("initialCapacity must be >= 1");
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}
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if (loadFactor <= 0.0f) {
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throw new IllegalArgumentException("loadFactor must be > 0");
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}
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this.loadFactor = loadFactor;
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// Allocate the arrays.
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states = new byte[initialCapacity];
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keys = new int[initialCapacity];
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@SuppressWarnings("unchecked")
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V[] temp = (V[]) new Object[initialCapacity];
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values = temp;
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// Initialize the maximum size value.
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maxSize = calcMaxSize(initialCapacity);
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// Initialize the available element count
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available = initialCapacity - size;
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}
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@Override
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public V get(int key) {
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int index = indexOf(key);
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return index < 0 ? null : values[index];
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}
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@Override
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public V put(int key, V value) {
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int hash = hash(key);
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int capacity = capacity();
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int index = hash % capacity;
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int increment = 1 + (hash % (capacity - 2));
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final int startIndex = index;
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int firstRemovedIndex = -1;
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do {
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switch (states[index]) {
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case AVAILABLE:
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// We only stop probing at a AVAILABLE node, since the value may still exist
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// beyond
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// a REMOVED node.
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if (firstRemovedIndex != -1) {
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// We encountered a REMOVED node prior. Store the entry there so that
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// retrieval
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// will be faster.
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insertAt(firstRemovedIndex, key, value);
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return null;
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}
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// No REMOVED node, just store the entry here.
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insertAt(index, key, value);
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return null;
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case OCCUPIED:
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if (keys[index] == key) {
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V previousValue = values[index];
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insertAt(index, key, value);
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return previousValue;
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}
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break;
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case REMOVED:
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// Check for first removed index.
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if (firstRemovedIndex == -1) {
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firstRemovedIndex = index;
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}
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break;
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default:
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throw new AssertionError("Invalid state: " + states[index]);
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}
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// REMOVED or OCCUPIED but wrong key, keep probing ...
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index += increment;
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if (index >= capacity) {
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// Handle wrap-around by decrement rather than mod.
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index -= capacity;
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}
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} while (index != startIndex);
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if (firstRemovedIndex == -1) {
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// Should never happen.
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throw new AssertionError("Unable to insert");
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}
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// Never found a AVAILABLE slot, just use the first REMOVED.
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insertAt(firstRemovedIndex, key, value);
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return null;
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}
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@Override
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public void putAll(IntObjectMap<V> sourceMap) {
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if (sourceMap instanceof IntObjectHashMap) {
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// Optimization - iterate through the arrays.
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IntObjectHashMap<V> source = (IntObjectHashMap<V>) sourceMap;
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int i = -1;
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while ((i = source.nextEntryIndex(i + 1)) >= 0) {
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put(source.keys[i], source.values[i]);
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}
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return;
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}
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// Otherwise, just add each entry.
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for (Entry<V> entry : sourceMap.entries()) {
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put(entry.key(), entry.value());
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}
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}
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@Override
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public V remove(int key) {
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int index = indexOf(key);
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if (index < 0) {
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return null;
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}
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V prev = values[index];
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removeAt(index);
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return prev;
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}
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@Override
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public int size() {
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return size;
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}
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@Override
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public boolean isEmpty() {
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return size == 0;
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}
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@Override
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public void clear() {
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Arrays.fill(states, AVAILABLE);
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Arrays.fill(values, null);
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size = 0;
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available = capacity();
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}
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@Override
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public boolean containsKey(int key) {
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return indexOf(key) >= 0;
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}
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@Override
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public boolean containsValue(V value) {
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int i = -1;
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while ((i = nextEntryIndex(i + 1)) >= 0) {
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V next = values[i];
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if (value == next || (value != null && value.equals(next))) {
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return true;
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}
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}
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return false;
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}
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@Override
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public Iterable<Entry<V>> entries() {
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return this;
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}
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@Override
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public Iterator<Entry<V>> iterator() {
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return new IteratorImpl();
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}
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@Override
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public int[] keys() {
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int[] outKeys = new int[size()];
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copyEntries(keys, outKeys);
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return outKeys;
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}
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@Override
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public V[] values(Class<V> clazz) {
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@SuppressWarnings("unchecked")
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V[] outValues = (V[]) Array.newInstance(clazz, size());
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copyEntries(values, outValues);
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return outValues;
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}
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/**
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* Copies the occupied entries from the source to the target array.
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*/
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private void copyEntries(Object sourceArray, Object targetArray) {
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int sourceIx = -1;
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int targetIx = 0;
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while ((sourceIx = nextEntryIndex(sourceIx + 1)) >= 0) {
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Object obj = Array.get(sourceArray, sourceIx);
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Array.set(targetArray, targetIx++, obj);
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}
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}
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/**
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* Locates the index for the given key. This method probes using double hashing.
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*
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* @param key the key for an entry in the map.
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* @return the index where the key was found, or {@code -1} if no entry is found for that key.
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*/
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private int indexOf(int key) {
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int hash = hash(key);
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int capacity = capacity();
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int increment = 1 + (hash % (capacity - 2));
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int index = hash % capacity;
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int startIndex = index;
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do {
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switch(states[index]) {
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case AVAILABLE:
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// It's available, so no chance that this value exists anywhere in the map.
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return -1;
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case OCCUPIED:
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if (key == keys[index]) {
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// Found it!
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return index;
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}
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break;
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default:
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break;
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}
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// REMOVED or OCCUPIED but wrong key, keep probing ...
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index += increment;
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if (index >= capacity) {
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// Handle wrap-around by decrement rather than mod.
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index -= capacity;
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}
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} while (index != startIndex);
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// Got back to the beginning. Not found.
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return -1;
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}
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/**
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* Determines the current capacity (i.e. size of the arrays).
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*/
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private int capacity() {
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return keys.length;
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}
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/**
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* Creates a hash value for the given key.
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*/
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private int hash(int key) {
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// Just make sure the integer is positive.
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return key & Integer.MAX_VALUE;
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}
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/**
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* Performs an insert of the key/value at the given index position. If necessary, performs a
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* rehash of the map.
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*
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* @param index the index at which to insert the key/value
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* @param key the entry key
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* @param value the entry value
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*/
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private void insertAt(int index, int key, V value) {
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byte state = states[index];
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if (state != OCCUPIED) {
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// Added a new mapping, increment the size.
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size++;
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if (state == AVAILABLE) {
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// Consumed a OCCUPIED slot, decrement the number of available slots.
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available--;
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}
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}
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keys[index] = key;
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values[index] = value;
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states[index] = OCCUPIED;
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if (size > maxSize) {
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// Need to grow the arrays.
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// TODO: consider using the next prime greater than capacity * 2.
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rehash(capacity() * 2);
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} else if (available == 0) {
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// Open addressing requires that we have at least 1 slot available. Need to refresh
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// the arrays to clear any removed elements.
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rehash(capacity());
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}
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}
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/**
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* Marks the entry at the given index position as {@link REMOVED} and sets the value to
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* {@code null}.
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* <p>
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* TODO: consider performing re-compaction.
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*
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* @param index the index position of the element to remove.
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*/
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private void removeAt(int index) {
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if (states[index] == OCCUPIED) {
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size--;
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}
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states[index] = REMOVED;
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values[index] = null;
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}
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/**
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* Calculates the maximum size allowed before rehashing.
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*/
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private int calcMaxSize(int capacity) {
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// Clip the upper bound so that there will always be at least one
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// available slot.
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int upperBound = capacity - 1;
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return Math.min(upperBound, (int) (capacity * loadFactor));
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}
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/**
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* Rehashes the map for the given capacity.
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*
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* @param newCapacity the new capacity for the map.
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*/
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private void rehash(int newCapacity) {
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int oldCapacity = capacity();
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int[] oldKeys = keys;
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V[] oldVals = values;
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byte[] oldStates = states;
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// New states array is automatically initialized to AVAILABLE (i.e. 0 == AVAILABLE).
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states = new byte[newCapacity];
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keys = new int[newCapacity];
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@SuppressWarnings("unchecked")
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V[] temp = (V[]) new Object[newCapacity];
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values = temp;
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size = 0;
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available = newCapacity;
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maxSize = calcMaxSize(newCapacity);
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// Insert the new states.
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for (int i = 0; i < oldCapacity; ++i) {
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if (oldStates[i] == OCCUPIED) {
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put(oldKeys[i], oldVals[i]);
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}
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}
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}
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/**
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* Returns the next index of the next entry in the map.
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*
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* @param index the index at which to begin the search.
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* @return the index of the next entry, or {@code -1} if not found.
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*/
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private int nextEntryIndex(int index) {
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int capacity = capacity();
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for (; index < capacity; ++index) {
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if (states[index] == OCCUPIED) {
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return index;
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}
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}
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return -1;
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}
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/**
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* Iterator for traversing the entries in this map.
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*/
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private final class IteratorImpl implements Iterator<Entry<V>> {
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int prevIndex;
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int nextIndex;
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IteratorImpl() {
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prevIndex = -1;
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nextIndex = nextEntryIndex(0);
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}
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@Override
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public boolean hasNext() {
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return nextIndex >= 0;
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}
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@Override
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public Entry<V> next() {
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if (!hasNext()) {
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throw new NoSuchElementException();
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}
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prevIndex = nextIndex;
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nextIndex = nextEntryIndex(nextIndex + 1);
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return new EntryImpl(prevIndex);
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}
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@Override
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public void remove() {
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if (prevIndex < 0) {
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throw new IllegalStateException("Next must be called before removing.");
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}
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removeAt(prevIndex);
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prevIndex = -1;
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}
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}
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/**
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* {@link Entry} implementation that just references the key/value at the given index position.
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*/
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private final class EntryImpl implements Entry<V> {
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final int index;
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EntryImpl(int index) {
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this.index = index;
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}
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@Override
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public int key() {
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return keys[index];
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}
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@Override
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public V value() {
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return values[index];
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}
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@Override
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public void setValue(V value) {
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values[index] = value;
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}
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}
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}
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116
common/src/main/java/io/netty/util/collection/IntObjectMap.java
Normal file
116
common/src/main/java/io/netty/util/collection/IntObjectMap.java
Normal file
@ -0,0 +1,116 @@
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/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License, version 2.0 (the
|
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* "License"); you may not use this file except in compliance with the License. You may obtain a
|
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* copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the License
|
||||
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing permissions and limitations under
|
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* the License.
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*/
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package io.netty.util.collection;
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/**
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* Interface for a primitive map that uses {@code int}s as keys.
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*
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* @param <V> the value type stored in the map.
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*/
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public interface IntObjectMap<V> {
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/**
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* An Entry in the map.
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*
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* @param <V> the value type stored in the map.
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*/
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interface Entry<V> {
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/**
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* Gets the key for this entry.
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*/
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int key();
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/**
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* Gets the value for this entry.
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*/
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V value();
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/**
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* Sets the value for this entry.
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*/
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void setValue(V value);
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}
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/**
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* Gets the value in the map with the specified key.
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*
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* @param key the key whose associated value is to be returned.
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* @return the value or {@code null} if the key was not found in the map.
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*/
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V get(int key);
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/**
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* Puts the given entry into the map.
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*
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* @param key the key of the entry.
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* @param value the value of the entry.
|
||||
* @return the previous value for this key or {@code null} if there was no previous mapping.
|
||||
*/
|
||||
V put(int key, V value);
|
||||
|
||||
/**
|
||||
* Puts all of the entries from the given map into this map.
|
||||
*/
|
||||
void putAll(IntObjectMap<V> sourceMap);
|
||||
|
||||
/**
|
||||
* Removes the entry with the specified key.
|
||||
*
|
||||
* @param key the key for the entry to be removed from this map.
|
||||
* @return the previous value for the key, or {@code null} if there was no mapping.
|
||||
*/
|
||||
V remove(int key);
|
||||
|
||||
/**
|
||||
* Returns the number of entries contained in this map.
|
||||
*/
|
||||
int size();
|
||||
|
||||
/**
|
||||
* Indicates whether or not this map is empty (i.e {@link #size()} == {@code 0]).
|
||||
|
||||
*/
|
||||
boolean isEmpty();
|
||||
|
||||
/**
|
||||
* Clears all entries from this map.
|
||||
*/
|
||||
void clear();
|
||||
|
||||
/**
|
||||
* Indicates whether or not this map contains a value for the specified key.
|
||||
*/
|
||||
boolean containsKey(int key);
|
||||
|
||||
/**
|
||||
* Indicates whether or not the map contains the specified value.
|
||||
*/
|
||||
boolean containsValue(V value);
|
||||
|
||||
/**
|
||||
* Gets an iterable collection of the entries contained in this map.
|
||||
*/
|
||||
Iterable<Entry<V>> entries();
|
||||
|
||||
/**
|
||||
* Gets the keys contained in this map.
|
||||
*/
|
||||
int[] keys();
|
||||
|
||||
/**
|
||||
* Gets the values contained in this map.
|
||||
*/
|
||||
V[] values(Class<V> clazz);
|
||||
}
|
||||
@ -0,0 +1,20 @@
|
||||
/*
|
||||
* Copyright 2014 The Netty Project
|
||||
*
|
||||
* The Netty Project licenses this file to you under the Apache License,
|
||||
* version 2.0 (the "License"); you may not use this file except in compliance
|
||||
* with the License. You may obtain a copy of the License at:
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
||||
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
||||
* License for the specific language governing permissions and limitations
|
||||
* under the License.
|
||||
*/
|
||||
|
||||
/**
|
||||
* Utility classes for commonly used collections.
|
||||
*/
|
||||
package io.netty.util.collection;
|
||||
@ -0,0 +1,286 @@
|
||||
/*
|
||||
* Copyright 2014 The Netty Project
|
||||
*
|
||||
* The Netty Project licenses this file to you under the Apache License, version 2.0 (the
|
||||
* "License"); you may not use this file except in compliance with the License. You may obtain a
|
||||
* copy of the License at:
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software distributed under the License
|
||||
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
|
||||
* or implied. See the License for the specific language governing permissions and limitations under
|
||||
* the License.
|
||||
*/
|
||||
package io.netty.util.collection;
|
||||
|
||||
import static org.junit.Assert.assertEquals;
|
||||
import static org.junit.Assert.assertFalse;
|
||||
import static org.junit.Assert.assertNull;
|
||||
import static org.junit.Assert.assertSame;
|
||||
import static org.junit.Assert.assertTrue;
|
||||
|
||||
import java.util.HashSet;
|
||||
import java.util.Set;
|
||||
|
||||
import org.junit.Before;
|
||||
import org.junit.Test;
|
||||
|
||||
/**
|
||||
* Tests for {@link IntObjectHashMap}.
|
||||
*/
|
||||
public class IntObjectHashMapTest {
|
||||
|
||||
private static class Value {
|
||||
private final String name;
|
||||
|
||||
public Value(String name) {
|
||||
this.name = name;
|
||||
}
|
||||
|
||||
@Override
|
||||
public int hashCode() {
|
||||
final int prime = 31;
|
||||
int result = 1;
|
||||
result = prime * result + ((name == null) ? 0 : name.hashCode());
|
||||
return result;
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean equals(Object obj) {
|
||||
if (this == obj) {
|
||||
return true;
|
||||
}
|
||||
if (obj == null) {
|
||||
return false;
|
||||
}
|
||||
if (getClass() != obj.getClass()) {
|
||||
return false;
|
||||
}
|
||||
Value other = (Value) obj;
|
||||
if (name == null) {
|
||||
if (other.name != null) {
|
||||
return false;
|
||||
}
|
||||
} else if (!name.equals(other.name)) {
|
||||
return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
private IntObjectHashMap<Value> map;
|
||||
|
||||
@Before
|
||||
public void setup() {
|
||||
map = new IntObjectHashMap<Value>();
|
||||
}
|
||||
|
||||
@Test
|
||||
public void putNewMappingShouldSucceed() {
|
||||
Value v = new Value("v");
|
||||
assertNull(map.put(1, v));
|
||||
assertEquals(1, map.size());
|
||||
assertTrue(map.containsKey(1));
|
||||
assertTrue(map.containsValue(v));
|
||||
assertEquals(v, map.get(1));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void putShouldReplaceValue() {
|
||||
Value v1 = new Value("v1");
|
||||
assertNull(map.put(1, v1));
|
||||
|
||||
// Replace the value.
|
||||
Value v2 = new Value("v2");
|
||||
assertSame(v1, map.put(1, v2));
|
||||
|
||||
assertEquals(1, map.size());
|
||||
assertTrue(map.containsKey(1));
|
||||
assertTrue(map.containsValue(v2));
|
||||
assertEquals(v2, map.get(1));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void putShouldGrowMap() {
|
||||
for (int i = 0; i < 10000; ++i) {
|
||||
Value v = new Value(Integer.toString(i));
|
||||
assertNull(map.put(i, v));
|
||||
assertEquals(i + 1, map.size());
|
||||
assertTrue(map.containsKey(i));
|
||||
assertTrue(map.containsValue(v));
|
||||
assertEquals(v, map.get(i));
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
public void removeMissingValueShouldReturnNull() {
|
||||
assertNull(map.remove(1));
|
||||
assertEquals(0, map.size());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void removeShouldReturnPreviousValue() {
|
||||
Value v = new Value("v");
|
||||
map.put(1, v);
|
||||
assertSame(v, map.remove(1));
|
||||
}
|
||||
|
||||
/**
|
||||
* This test is a bit internal-centric. We're just forcing a rehash to occur based on no longer
|
||||
* having any FREE slots available. We do this by adding and then removing several keys up to
|
||||
* the capacity, so that no rehash is done. We then add one more, which will cause the rehash
|
||||
* due to a lack of free slots and verify that everything is still behaving properly
|
||||
*/
|
||||
@Test
|
||||
public void noFreeSlotsShouldRehash() {
|
||||
for (int i = 0; i < 10; ++i) {
|
||||
map.put(i, new Value(Integer.toString(i)));
|
||||
// Now mark it as REMOVED so that size won't cause the rehash.
|
||||
map.remove(i);
|
||||
assertEquals(0, map.size());
|
||||
}
|
||||
|
||||
// Now add an entry to force the rehash since no FREE slots are available in the map.
|
||||
Value v = new Value("v");
|
||||
map.put(1, v);
|
||||
assertEquals(1, map.size());
|
||||
assertSame(v, map.get(1));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void putAllShouldSucceed() {
|
||||
Value v1 = new Value("v1");
|
||||
Value v2 = new Value("v2");
|
||||
Value v3 = new Value("v3");
|
||||
map.put(1, v1);
|
||||
map.put(2, v2);
|
||||
map.put(3, v3);
|
||||
|
||||
IntObjectHashMap<Value> map2 = new IntObjectHashMap<Value>();
|
||||
map2.putAll(map);
|
||||
assertEquals(3, map2.size());
|
||||
assertSame(v1, map2.get(1));
|
||||
assertSame(v2, map2.get(2));
|
||||
assertSame(v3, map2.get(3));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void clearShouldSucceed() {
|
||||
Value v1 = new Value("v1");
|
||||
Value v2 = new Value("v2");
|
||||
Value v3 = new Value("v3");
|
||||
map.put(1, v1);
|
||||
map.put(2, v2);
|
||||
map.put(3, v3);
|
||||
map.clear();
|
||||
assertEquals(0, map.size());
|
||||
assertTrue(map.isEmpty());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void containsValueShouldFindNull() {
|
||||
map.put(1, new Value("v1"));
|
||||
map.put(2, null);
|
||||
map.put(3, new Value("v2"));
|
||||
assertTrue(map.containsValue(null));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void containsValueShouldFindInstance() {
|
||||
Value v = new Value("v1");
|
||||
map.put(1, new Value("v2"));
|
||||
map.put(2, new Value("v3"));
|
||||
map.put(3, v);
|
||||
assertTrue(map.containsValue(v));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void containsValueShouldFindEquivalentValue() {
|
||||
map.put(1, new Value("v1"));
|
||||
map.put(2, new Value("v2"));
|
||||
map.put(3, new Value("v3"));
|
||||
assertTrue(map.containsValue(new Value("v2")));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void containsValueNotFindMissingValue() {
|
||||
map.put(1, new Value("v1"));
|
||||
map.put(2, new Value("v2"));
|
||||
map.put(3, new Value("v3"));
|
||||
assertFalse(map.containsValue(new Value("v4")));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void iteratorShouldTraverseEntries() {
|
||||
map.put(1, new Value("v1"));
|
||||
map.put(2, new Value("v2"));
|
||||
map.put(3, new Value("v3"));
|
||||
|
||||
// Add and then immediately remove another entry.
|
||||
map.put(4, new Value("v4"));
|
||||
map.remove(4);
|
||||
|
||||
Set<Integer> found = new HashSet<Integer>();
|
||||
for (IntObjectMap.Entry<Value> entry : map.entries()) {
|
||||
assertTrue(found.add(entry.key()));
|
||||
}
|
||||
assertEquals(3, found.size());
|
||||
assertTrue(found.contains(1));
|
||||
assertTrue(found.contains(2));
|
||||
assertTrue(found.contains(3));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void keysShouldBeReturned() {
|
||||
map.put(1, new Value("v1"));
|
||||
map.put(2, new Value("v2"));
|
||||
map.put(3, new Value("v3"));
|
||||
|
||||
// Add and then immediately remove another entry.
|
||||
map.put(4, new Value("v4"));
|
||||
map.remove(4);
|
||||
|
||||
int[] keys = map.keys();
|
||||
assertEquals(3, keys.length);
|
||||
|
||||
Set<Integer> expected = new HashSet<Integer>();
|
||||
expected.add(1);
|
||||
expected.add(2);
|
||||
expected.add(3);
|
||||
|
||||
Set<Integer> found = new HashSet<Integer>();
|
||||
for (int key : keys) {
|
||||
assertTrue(found.add(key));
|
||||
}
|
||||
assertEquals(expected, found);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void valuesShouldBeReturned() {
|
||||
Value v1 = new Value("v1");
|
||||
Value v2 = new Value("v2");
|
||||
Value v3 = new Value("v3");
|
||||
map.put(1, v1);
|
||||
map.put(2, v2);
|
||||
map.put(3, v3);
|
||||
|
||||
// Add and then immediately remove another entry.
|
||||
map.put(4, new Value("v4"));
|
||||
map.remove(4);
|
||||
|
||||
Value[] values = map.values(Value.class);
|
||||
assertEquals(3, values.length);
|
||||
|
||||
Set<Value> expected = new HashSet<Value>();
|
||||
expected.add(v1);
|
||||
expected.add(v2);
|
||||
expected.add(v3);
|
||||
|
||||
Set<Value> found = new HashSet<Value>();
|
||||
for (Value value : values) {
|
||||
assertTrue(found.add(value));
|
||||
}
|
||||
assertEquals(expected, found);
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user