Returns a cached thread-local CharsetEncoder for the specified charset. - Java Internationalization

Java examples for Internationalization:Charset

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Description

Returns a cached thread-local CharsetEncoder for the specified charset.

Demo Code

/*//w  w w.j  av  a2  s.c  om
 * Copyright 2014 the original author or authors.
 *
 * 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.java2s;
import java.nio.charset.Charset;

import java.nio.charset.CharsetEncoder;
import java.nio.charset.CodingErrorAction;
import java.util.IdentityHashMap;
import java.util.Map;

public class Main {
    private static final ThreadLocal<Map<Charset, CharsetEncoder>> encoders = new ThreadLocal<Map<Charset, CharsetEncoder>>() {
        @Override
        protected Map<Charset, CharsetEncoder> initialValue() {
            return new IdentityHashMap<Charset, CharsetEncoder>();
        }
    };

    /**
     * Returns a cached thread-local {@link CharsetEncoder} for the specified <tt>charset</tt>.
     * @param charset {@link java.nio.charset.Charset}
     * @return {@link java.nio.charset.CharsetEncoder}
     */
    public static CharsetEncoder getEncoder(Charset charset) {
        if (charset == null) {
            throw new NullPointerException("charset");
        }

        Map<Charset, CharsetEncoder> map = encoders.get();
        CharsetEncoder e = map.get(charset);
        if (e != null) {
            e.reset();
            e.onMalformedInput(CodingErrorAction.REPLACE);
            e.onUnmappableCharacter(CodingErrorAction.REPLACE);
            return e;
        }

        e = charset.newEncoder();
        e.onMalformedInput(CodingErrorAction.REPLACE);
        e.onUnmappableCharacter(CodingErrorAction.REPLACE);
        map.put(charset, e);
        return e;
    }
}

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