JavaCharset.java

package com.cloudhopper.commons.charset;

/*
 * #%L
 * ch-commons-charset
 * %%
 * Copyright (C) 2012 Cloudhopper by Twitter
 * %%
 * 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.
 * #L%
 */

import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.UnsupportedCharsetException;

/**
 * Base class for all charset conversions that rely on the internal Java
 * String getBytes() methods.
 * 
 * @author joelauer (twitter: @jjlauer or <a href="http://twitter.com/jjlauer" target=window>http://twitter.com/jjlauer</a>)
 */
public abstract class JavaCharset extends BaseCharset {
    
    private final java.nio.charset.Charset charset;

    public JavaCharset(String charsetName) {
        try {
            this.charset = java.nio.charset.Charset.forName(charsetName);
        } catch (UnsupportedCharsetException e) {
            throw new IllegalArgumentException("Unsupported Java charset [" + charsetName + "]");
        }
    }

    @Override
    public byte[] encode(CharSequence str0) {
        if (str0 == null) {
            return null;
        }

        return str0.toString().getBytes(charset);
    }

    @Override
    public void decode(byte[] bytes, StringBuilder buffer) {
        if (bytes == null) {
            return;
        }
        ByteBuffer byteBuffer = ByteBuffer.wrap(bytes);
        CharBuffer charBuffer = charset.decode(byteBuffer);
        buffer.append(charBuffer);
    }
    
    @Override
    public String decode(byte[] bytes) {
        if (bytes == null) {
            return null;
        }
        return new String(bytes, charset);
    }

}