| /* |
| * Copyright 2009-2010 by The Regents of the University of California |
| * 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 from |
| * |
| * 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 edu.uci.ics.pregelix.dataflow.util; |
| |
| import java.io.InputStream; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| public class ResetableByteArrayInputStream extends InputStream { |
| private static final Logger LOGGER = Logger.getLogger(ResetableByteArrayInputStream.class.getName()); |
| |
| private byte[] data; |
| private int position; |
| |
| public ResetableByteArrayInputStream() { |
| } |
| |
| public void setByteArray(byte[] data, int position) { |
| this.data = data; |
| this.position = position; |
| } |
| |
| @Override |
| public int read() { |
| int remaining = data.length - position; |
| int value = remaining > 0 ? (data[position++] & 0xff) : -1; |
| if (LOGGER.isLoggable(Level.FINEST)) { |
| LOGGER.finest("read(): value: " + value + " remaining: " + remaining + " position: " + position); |
| } |
| return value; |
| } |
| |
| @Override |
| public int read(byte[] bytes, int offset, int length) { |
| int remaining = data.length - position; |
| if (LOGGER.isLoggable(Level.FINEST)) { |
| LOGGER.finest("read(bytes[], int, int): remaining: " + remaining + " offset: " + offset + " length: " |
| + length + " position: " + position); |
| } |
| if (remaining == 0) { |
| return -1; |
| } |
| int l = Math.min(length, remaining); |
| System.arraycopy(data, position, bytes, offset, l); |
| position += l; |
| return l; |
| } |
| } |