96 lines
2.3 KiB
Java
96 lines
2.3 KiB
Java
package it.cavallium.strangedb.java.objects.lists;
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import it.unimi.dsi.fastutil.longs.LongArrayList;
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import it.cavallium.strangedb.java.objects.EnhancedObject;
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import it.cavallium.strangedb.java.database.IDatabaseTools;
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import java.io.IOException;
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import java.util.Collection;
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import java.util.StringJoiner;
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public abstract class StrangeDbList<T> extends EnhancedObject {
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private final Object indicesAccessLock = new Object();
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protected abstract LongArrayList getIndices();
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public StrangeDbList() {
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}
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public StrangeDbList(IDatabaseTools databaseTools) throws IOException {
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super(databaseTools);
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}
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public T get(int index) throws IOException {
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synchronized (indicesAccessLock) {
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long uid = getIndices().getLong(index);
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return loadItem(uid);
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}
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}
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public void add(T value) throws IOException {
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long uid = databaseTools.getObjectsIO().newNullObject();
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synchronized (indicesAccessLock) {
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getIndices().add(uid);
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writeItemToDisk(uid, value);
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}
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}
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public void update(int index, T value) throws IOException {
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synchronized (indicesAccessLock) {
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long uid = getIndices().getLong(index);
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writeItemToDisk(uid, value);
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}
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}
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public void set(int index, T value) throws IOException {
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long uid = databaseTools.getObjectsIO().newNullObject();
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synchronized (indicesAccessLock) {
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getIndices().set(index, uid);
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writeItemToDisk(uid, value);
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}
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}
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public void add(int index, T value) throws IOException {
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long uid = databaseTools.getObjectsIO().newNullObject();
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synchronized (indicesAccessLock) {
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getIndices().add(index, uid);
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writeItemToDisk(uid, value);
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}
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}
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public T getLast() throws IOException {
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synchronized (indicesAccessLock) {
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if (getIndices().size() > 0) {
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return get(getIndices().size() - 1);
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} else {
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return null;
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}
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}
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}
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public boolean isEmpty() {
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synchronized (indicesAccessLock) {
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return getIndices().size() <= 0;
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}
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}
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public int size() {
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synchronized (indicesAccessLock) {
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return getIndices().size();
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}
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}
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protected abstract T loadItem(long uid) throws IOException;
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protected abstract void writeItemToDisk(long uid, T item) throws IOException;
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@Override
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public String toString() {
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return new StringJoiner(", ", StrangeDbList.class.getSimpleName() + "[", "]")
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.add(getIndices().size() + " items")
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.toString();
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}
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}
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