ElementOutputStream.java

/*
 * Copyright (c) 2006, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 * 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 org.wso2.carbon.mediator.transform.stream;

import java.io.ByteArrayOutputStream;

/**
 * This class extends ByteArrayOutputStream.
 * The internal byte array can be resized by removing read part of the array.
 */
public class ElementOutputStream extends ByteArrayOutputStream {

    /**
     * The read data of the buffer is removed and  rest is assigned.
     * For example if i=100 & this.buf.length=120 then copy byte 101 to 120 and assign to this.buf
     * So the first 100 bytes are removed from this.buf
     * @param i Position up to which the buffer had been read
     */
    public void resizeBuffer(int i) {
		byte[] temp = this.buf;
		int copyLength = temp.length - i;
		this.buf = new byte[copyLength];
		if (copyLength > 0) {
			System.arraycopy(temp, i, this.buf, 0, copyLength);
		}
		this.count = copyLength;
	}

}