/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.apache.cxf.helpers;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;

/**
 * Subclass of ByteArrayOutputStream that allows creation of a
 * ByteArrayInputStream directly without creating a copy of the byte[].
 * 
 * Also, on "toByteArray()" it truncates it's buffer to the current size
 * and returns the new buffer directly.  Multiple calls to toByteArray() 
 * will return the exact same byte[] unless a write is called in between.
 * 
 * Note: once the InputStream is created, the output stream should
 * no longer be used.  In particular, make sure not to call reset()
 * and then write as that may overwrite the data that the InputStream
 * is using.
 */
public class LoadingByteArrayOutputStream extends ByteArrayOutputStream {
    public LoadingByteArrayOutputStream() {
        super(1024);
    }
    public LoadingByteArrayOutputStream(int i) {
        super(i);
    }
    
    public ByteArrayInputStream createInputStream() {
        return new ByteArrayInputStream(buf, 0, count) {
            public String toString() {
                return IOUtils.newStringFromBytes(buf, 0, count);
            }
        };
    }
    
    public byte[] toByteArray() {
        if (count != buf.length) {
            buf = super.toByteArray();
        }
        return buf;
    }
}