| /* |
| * 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.hyracks.data.std.util; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.util.Arrays; |
| |
| public class ByteArrayAccessibleOutputStream extends ByteArrayOutputStream { |
| |
| public ByteArrayAccessibleOutputStream() { |
| super(); |
| } |
| |
| public ByteArrayAccessibleOutputStream(int size) { |
| super(size); |
| } |
| |
| public byte[] getByteArray() { |
| return buf; |
| } |
| |
| // Override to make it not synchronized. |
| @Override |
| public void reset() { |
| count = 0; |
| } |
| |
| @Override |
| public void write(int b) { |
| ensureCapacity(count + 1); |
| buf[count] = (byte) b; |
| count += 1; |
| } |
| |
| /** |
| * Rewind the current position by {@code delta} to a previous position. |
| * This function is used to drop the already written delta bytes. |
| * In some cases, we write some bytes, and afterward we found we've written more than expected. |
| * Then we need to fix the position by rewind the current position to the expected one. |
| * Currently, it is used by the {@link AbstractVarLenObjectBuilder} which may take more space than required |
| * at beginning, and it will shift the data and fix the position whenever required. |
| * It will throw {@link IndexOutOfBoundsException} if the {@code delta} is negative. |
| * Evil function, use with caution. |
| * |
| * @param delta |
| */ |
| public void rewindPositionBy(int delta) { |
| if (delta < 0 || count < delta) { |
| throw new IndexOutOfBoundsException(); |
| } |
| count -= delta; |
| } |
| |
| @Override |
| public void write(byte[] b, int off, int len) { |
| if ((off < 0) || (off > b.length) || (len < 0) || ((off + len) - b.length > 0)) { |
| throw new IndexOutOfBoundsException(); |
| } |
| ensureCapacity(count + len); |
| System.arraycopy(b, off, buf, count, len); |
| count += len; |
| } |
| |
| private void ensureCapacity(int minCapacity) { |
| // overflow-conscious code |
| if (minCapacity - buf.length > 0) |
| grow(minCapacity); |
| } |
| |
| /** |
| * Increases the capacity to ensure that it can hold at least the |
| * number of elements specified by the minimum capacity argument. |
| * |
| * @param minCapacity |
| * the desired minimum capacity |
| */ |
| private void grow(int minCapacity) { |
| // overflow-conscious code |
| int oldCapacity = buf.length; |
| int newCapacity = oldCapacity << 1; |
| if (newCapacity - minCapacity < 0) |
| newCapacity = minCapacity; |
| if (newCapacity < 0) { |
| if (minCapacity < 0) // overflow |
| throw new OutOfMemoryError(); |
| newCapacity = Integer.MAX_VALUE; |
| } |
| buf = Arrays.copyOf(buf, newCapacity); |
| } |
| } |