/**
* 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.hive.hcatalog.templeton;
import java.io.ByteArrayOutputStream;
/**
* An output stream that will only accept the first N bytes of data.
*/
public class MaxByteArrayOutputStream extends ByteArrayOutputStream {
/**
* The max number of bytes stored.
*/
private int maxBytes;
/**
* The number of bytes currently stored.
*/
private int nBytes;
/**
* Create.
*/
public MaxByteArrayOutputStream(int maxBytes) {
this.maxBytes = maxBytes;
nBytes = 0;
}
/**
* Writes the specified byte to this byte array output stream.
* Any bytes after the first maxBytes will be ignored.
*
* @param b the byte to be written.
*/
public synchronized void write(int b) {
if (nBytes < maxBytes) {
++nBytes;
super.write(b);
}
}
/**
* Writes <code>len</code> bytes from the specified byte array
* starting at offset <code>off</code> to this byte array output stream.
* Any bytes after the first maxBytes will be ignored.
*
* @param b the data.
* @param off the start offset in the data.
* @param len the number of bytes to write.
*/
public synchronized void write(byte b[], int off, int len) {
int storable = Math.min(maxBytes - nBytes, len);
if (storable > 0) {
nBytes += storable;
super.write(b, off, storable);
}
}
}