Add the character to the CharBuffer, extending the buffer if needed - Java java.nio

Java examples for java.nio:CharBuffer

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Description

Add the character to the CharBuffer, extending the buffer if needed

Demo Code

/*//from w  w w .  j  a v  a  2s.  c  om
 * Copyright (c) 2013 Ramon Servadei 
 *  
 * 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.CharBuffer;

public class Main {
    public static final int BLOCK_SIZE = 64;

    /**
     * Add the character to the buffer, extending the buffer if needed
     * 
     * @return the same buffer if not extended, <b>a new buffer if extended</b>
     */
    public static final CharBuffer put(char c, CharBuffer buffer) {
        CharBuffer localBuf = buffer;
        if (capacityRemaining(buffer) < 1) {
            localBuf = extendBuffer(buffer, BLOCK_SIZE);
        }
        localBuf.put(c);
        return localBuf;
    }

    /**
     * @see #putChar(char, CharBuffer)
     */
    public static final CharBuffer put(char[] chars, CharBuffer buffer) {
        CharBuffer localBuf = buffer;
        if (capacityRemaining(buffer) < chars.length) {
            localBuf = extendBuffer(buffer, chars.length + BLOCK_SIZE);
        }
        localBuf.put(chars);
        return localBuf;
    }

    /**
     * @return the remaining capacity in the buffer
     */
    private static int capacityRemaining(CharBuffer buffer) {
        return buffer.limit() - buffer.position();
    }

    /**
     * @return a new buffer with the contents of the original buffer and extended by the size
     */
    private static CharBuffer extendBuffer(CharBuffer buffer, int size) {
        final CharBuffer localBuffer = CharBuffer.allocate(buffer
                .capacity() + size);
        System.arraycopy(buffer.array(), 0, localBuffer.array(), 0,
                buffer.position());
        localBuffer.position(buffer.position());
        return localBuffer;
    }
}

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