| /* |
| * 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.pig.data; |
| |
| import java.io.ByteArrayOutputStream; |
| |
| /** A reusable byte buffer implementation |
| * |
| * <p>This saves memory over creating a new byte[] and |
| * ByteArrayOutputStream each time data is written. |
| * |
| * <p>Typical usage is something like the following:<pre> |
| * |
| * WritableByteArray buffer = new WritableByteArray(); |
| * while (... loop condition ...) { |
| * buffer.reset(); |
| * ... write to buffer ... |
| * byte[] data = buffer.getData(); |
| * int dataLength = buffer.getLength(); |
| * ... write data to its ultimate destination ... |
| * } |
| * </pre> |
| * |
| */ |
| public class WritableByteArray extends ByteArrayOutputStream { |
| |
| public WritableByteArray() { |
| super(); |
| } |
| |
| public WritableByteArray(int size) { |
| super(size); |
| } |
| |
| public WritableByteArray(byte[] buf) { |
| this.buf = buf; |
| this.count = buf.length; |
| } |
| |
| /** |
| * Returns the current contents of the buffer. |
| * Data is only valid to {@link #getLength()}. |
| * @return contents of the buffer |
| */ |
| public byte[] getData() { |
| return buf; |
| } |
| |
| /** |
| * Returns the length of the valid data currently in the buffer |
| * @return length of valid data |
| */ |
| public int getLength() { |
| return count; |
| } |
| |
| } |