com.landawn.abacus.util.Charsets Maven / Gradle / Ivy

/*
 * Copyright (C) 2015 HaiYang Li
 *
 * Licensed 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 com.landawn.abacus.util;

import java.nio.charset.Charset;
import java.util.Map;

/**
 * 
 * @since 0.8
 * 
 * @author Haiyang Li
 */
public final class Charsets {
    public static final Charset US_ASCII = Charset.forName("US-ASCII");
    public static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");
    public static final Charset UTF_8 = Charset.forName("UTF-8");
    public static final Charset UTF_16BE = Charset.forName("UTF-16BE");
    public static final Charset UTF_16LE = Charset.forName("UTF-16LE");
    public static final Charset UTF_16 = Charset.forName("UTF-16");

    /**
     * Returns the default charset of this Java virtual machine.
     */
    public static final Charset DEFAULT = Charset.defaultCharset();

    private static final Map charsetPool = new ObjectPool(128);
    static {
        charsetPool.put(US_ASCII.name(), US_ASCII);
        charsetPool.put(ISO_8859_1.name(), ISO_8859_1);
        charsetPool.put(UTF_8.name(), UTF_8);
        charsetPool.put(UTF_16BE.name(), UTF_16BE);
        charsetPool.put(UTF_16LE.name(), UTF_16LE);
        charsetPool.put(UTF_16.name(), UTF_16);
    }

    private Charsets() {
        // singleton.
    }

    public static Charset get(String charsetName) {
        Charset charset = charsetPool.get(charsetName);

        if (charset == null) {
            charset = Charset.forName(charsetName);
            charsetPool.put(charsetName, charset);
        }

        return charset;
    }
}