107 lines
3.0 KiB
Java
107 lines
3.0 KiB
Java
/*
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* Copyright 2011 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a 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
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.util.internal;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* Conversion utility class to parse a property represented as a string or
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* an object.
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*/
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public final class ConversionUtil {
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/**
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* Converts the specified object into an integer.
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*/
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public static int toInt(Object value) {
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if (value instanceof Number) {
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return ((Number) value).intValue();
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} else {
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return Integer.parseInt(String.valueOf(value));
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}
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}
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/**
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* Converts the specified object into a boolean.
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*/
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public static boolean toBoolean(Object value) {
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if (value instanceof Boolean) {
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return ((Boolean) value).booleanValue();
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}
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if (value instanceof Number) {
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return ((Number) value).intValue() != 0;
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} else {
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String s = String.valueOf(value);
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if (s.length() == 0) {
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return false;
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}
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try {
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return Integer.parseInt(s) != 0;
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} catch (NumberFormatException e) {
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// Proceed
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}
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switch (Character.toUpperCase(s.charAt(0))) {
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case 'T': case 'Y':
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return true;
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}
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return false;
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}
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}
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/**
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* Converts the specified object into an array of strings.
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*/
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public static String[] toStringArray(Object value) {
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if (value instanceof String[]) {
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return (String[]) value;
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}
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if (value instanceof Iterable<?>) {
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List<String> answer = new ArrayList<String>();
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for (Object v: (Iterable<?>) value) {
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if (v == null) {
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answer.add(null);
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} else {
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answer.add(String.valueOf(v));
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}
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}
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return answer.toArray(new String[answer.size()]);
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}
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return String.valueOf(value).split("[, \\t\\n\\r\\f\\e\\a]");
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}
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private static final String[] INTEGERS = {
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"0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
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"10", "11", "12", "13", "14", "15",
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};
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public static String toString(int value) {
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if (value >= 0 && value < INTEGERS.length) {
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return INTEGERS[value];
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} else {
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return Integer.toString(value);
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}
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}
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private ConversionUtil() {
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// Unused
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}
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}
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