HADOOP-1498. Add file missed in prior commit.
git-svn-id: https://svn.apache.org/repos/asf/lucene/hadoop/trunk/src/contrib/hbase@548794 13f79535-47bb-0310-9956-ffa450edef68
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.hbase.io;
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import java.io.IOException;
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import java.io.DataInput;
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import java.io.DataOutput;
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import java.util.List;
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import org.apache.hadoop.io.BytesWritable;
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import org.apache.hadoop.io.WritableComparable;
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import org.apache.hadoop.io.WritableComparator;
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/**
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* A byte sequence that is usable as a key or value. Based on
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* {@link org.apache.hadoop.io.BytesWritable} only this class is NOT resizable
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* and DOES NOT distinguish between the size of the seqeunce and the current
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* capacity as {@link org.apache.hadoop.io.BytesWritable} does. Hence its
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* comparatively 'immutable'.
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*/
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public class ImmutableBytesWritable implements WritableComparable {
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private byte[] bytes;
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/**
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* Create a zero-size sequence.
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*/
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public ImmutableBytesWritable() {
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super();
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}
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/**
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* Create a ImmutableBytesWritable using the byte array as the initial value.
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* @param bytes This array becomes the backing storage for the object.
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*/
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public ImmutableBytesWritable(byte[] bytes) {
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this.bytes = bytes;
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}
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/**
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* Set the new ImmutableBytesWritable to a copy of the contents of the passed
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* <code>ibw</code>.
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* @param ibw the value to set this ImmutableBytesWritable to.
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*/
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public ImmutableBytesWritable(final ImmutableBytesWritable ibw) {
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this(ibw.get(), 0, ibw.getSize());
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}
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/**
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* Set the value to a copy of the given byte range
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* @param newData the new values to copy in
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* @param offset the offset in newData to start at
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* @param length the number of bytes to copy
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*/
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public ImmutableBytesWritable(final byte[] newData, final int offset,
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final int length) {
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this.bytes = new byte[length];
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System.arraycopy(newData, offset, this.bytes, 0, length);
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}
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/**
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* Get the data from the BytesWritable.
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* @return The data is only valid between 0 and getSize() - 1.
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*/
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public byte[] get() {
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if (this.bytes == null) {
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throw new IllegalStateException("Uninitialiized. Null constructor " +
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"called w/o accompaying readFields invocation");
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}
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return this.bytes;
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}
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/**
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* Get the current size of the buffer.
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*/
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public int getSize() {
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if (this.bytes == null) {
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throw new IllegalStateException("Uninitialiized. Null constructor " +
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"called w/o accompaying readFields invocation");
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}
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return this.bytes.length;
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}
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// inherit javadoc
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public void readFields(final DataInput in) throws IOException {
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this.bytes = new byte[in.readInt()];
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in.readFully(this.bytes, 0, this.bytes.length);
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}
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// inherit javadoc
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public void write(final DataOutput out) throws IOException {
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out.writeInt(this.bytes.length);
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out.write(this.bytes, 0, this.bytes.length);
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}
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// Below methods copied from BytesWritable
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public int hashCode() {
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return WritableComparator.hashBytes(bytes, this.bytes.length);
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}
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/**
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* Define the sort order of the BytesWritable.
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* @param right_obj The other bytes writable
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* @return Positive if left is bigger than right, 0 if they are equal, and
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* negative if left is smaller than right.
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*/
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public int compareTo(Object right_obj) {
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return compareTo(((ImmutableBytesWritable)right_obj).get());
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}
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public int compareTo(final byte [] that) {
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int diff = this.bytes.length - that.length;
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return (diff != 0)?
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diff:
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WritableComparator.compareBytes(this.bytes, 0, this.bytes.length, that,
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0, that.length);
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}
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/**
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* Are the two byte sequences equal?
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*/
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public boolean equals(Object right_obj) {
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if (right_obj instanceof ImmutableBytesWritable) {
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return compareTo(right_obj) == 0;
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}
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return false;
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}
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/**
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* Generate the stream of bytes as hex pairs separated by ' '.
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*/
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public String toString() {
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StringBuffer sb = new StringBuffer(3*this.bytes.length);
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for (int idx = 0; idx < this.bytes.length; idx++) {
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// if not the first, put a blank separator in
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if (idx != 0) {
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sb.append(' ');
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}
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String num = Integer.toHexString(bytes[idx]);
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// if it is only one digit, add a leading 0.
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if (num.length() < 2) {
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sb.append('0');
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}
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sb.append(num);
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}
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return sb.toString();
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}
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/** A Comparator optimized for ImmutableBytesWritable.
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*/
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public static class Comparator extends WritableComparator {
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private BytesWritable.Comparator comparator =
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new BytesWritable.Comparator();
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public Comparator() {
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super(ImmutableBytesWritable.class);
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}
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/**
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* Compare the buffers in serialized form.
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*/
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public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) {
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return comparator.compare(b1, s1, l1, b2, s2, l2);
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}
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}
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static { // register this comparator
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WritableComparator.define(ImmutableBytesWritable.class, new Comparator());
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}
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/**
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* @param array List of byte [].
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* @return Array of byte [].
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*/
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public static byte [][] toArray(final List<byte []> array) {
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// List#toArray doesn't work on lists of byte [].
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byte[][] results = new byte[array.size()][];
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for (int i = 0; i < array.size(); i++) {
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results[i] = array.get(i);
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}
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return results;
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}
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}
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