org.apache.hadoop.hive.serde2.binarysortable.OutputByteBuffer Maven / Gradle / Ivy
/**
* 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.hadoop.hive.serde2.binarysortable;
import java.util.Arrays;
/**
* This class is much more efficient than ByteArrayOutputStream because none of
* the methods are synchronized.
*/
public class OutputByteBuffer {
byte[] data;
int length;
public OutputByteBuffer(int size) {
data = new byte[size];
}
public OutputByteBuffer() {
this(128);
}
/**
* Reset the byte buffer.
*/
public void reset() {
length = 0;
}
public final void write(byte b) {
write(b, false);
}
/**
* Write one byte to the byte buffer. Final method to help inlining.
*
* @param invert
* whether we want to invert all the bits.
*/
public final void write(byte b, boolean invert) {
if (length == data.length) {
data = Arrays.copyOf(data, data.length * 2);
}
if (invert) {
data[length++] = (byte) (0xff ^ b);
} else {
data[length++] = b;
}
}
/**
* Returns the underlying byte array.
*/
public final byte[] getData() {
return data;
}
/**
* Returns the current length.
*/
public final int getLength() {
return length;
}
/**
* Return the bytes in hex format.
*/
public String dumpHex() {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < length; i++) {
byte b = data[i];
int v = (b < 0 ? 256 + b : b);
sb.append(String.format("x%02x", v));
}
return sb.toString();
}
}