Author: cutting
Date: Tue Jun 19 09:40:59 2007
New Revision: 548794
URL: http://svn.apache.org/viewvc?view=rev&rev=548794
Log:
HADOOP-1498. Add file missed in prior commit.
Added:
lucene/hadoop/trunk/src/contrib/hbase/src/java/org/apache/hadoop/hbase/io/
lucene/hadoop/trunk/src/contrib/hbase/src/java/org/apache/hadoop/hbase/io/ImmutableBytesWritable.java
Added:
lucene/hadoop/trunk/src/contrib/hbase/src/java/org/apache/hadoop/hbase/io/ImmutableBytesWritable.java
URL:
http://svn.apache.org/viewvc/lucene/hadoop/trunk/src/contrib/hbase/src/java/org/apache/hadoop/hbase/io/ImmutableBytesWritable.java?view=auto&rev=548794
==============================================================================
---
lucene/hadoop/trunk/src/contrib/hbase/src/java/org/apache/hadoop/hbase/io/ImmutableBytesWritable.java
(added)
+++
lucene/hadoop/trunk/src/contrib/hbase/src/java/org/apache/hadoop/hbase/io/ImmutableBytesWritable.java
Tue Jun 19 09:40:59 2007
@@ -0,0 +1,200 @@
+/**
+ * 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.hbase.io;
+
+import java.io.IOException;
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.util.List;
+
+import org.apache.hadoop.io.BytesWritable;
+import org.apache.hadoop.io.WritableComparable;
+import org.apache.hadoop.io.WritableComparator;
+
+/**
+ * A byte sequence that is usable as a key or value. Based on
+ * [EMAIL PROTECTED] org.apache.hadoop.io.BytesWritable} only this class is
NOT resizable
+ * and DOES NOT distinguish between the size of the seqeunce and the current
+ * capacity as [EMAIL PROTECTED] org.apache.hadoop.io.BytesWritable} does.
Hence its
+ * comparatively 'immutable'.
+ */
+public class ImmutableBytesWritable implements WritableComparable {
+ private byte[] bytes;
+
+ /**
+ * Create a zero-size sequence.
+ */
+ public ImmutableBytesWritable() {
+ super();
+ }
+
+ /**
+ * Create a ImmutableBytesWritable using the byte array as the initial value.
+ * @param bytes This array becomes the backing storage for the object.
+ */
+ public ImmutableBytesWritable(byte[] bytes) {
+ this.bytes = bytes;
+ }
+
+ /**
+ * Set the new ImmutableBytesWritable to a copy of the contents of the passed
+ * <code>ibw</code>.
+ * @param ibw the value to set this ImmutableBytesWritable to.
+ */
+ public ImmutableBytesWritable(final ImmutableBytesWritable ibw) {
+ this(ibw.get(), 0, ibw.getSize());
+ }
+
+ /**
+ * Set the value to a copy of the given byte range
+ * @param newData the new values to copy in
+ * @param offset the offset in newData to start at
+ * @param length the number of bytes to copy
+ */
+ public ImmutableBytesWritable(final byte[] newData, final int offset,
+ final int length) {
+ this.bytes = new byte[length];
+ System.arraycopy(newData, offset, this.bytes, 0, length);
+ }
+
+ /**
+ * Get the data from the BytesWritable.
+ * @return The data is only valid between 0 and getSize() - 1.
+ */
+ public byte[] get() {
+ if (this.bytes == null) {
+ throw new IllegalStateException("Uninitialiized. Null constructor " +
+ "called w/o accompaying readFields invocation");
+ }
+ return this.bytes;
+ }
+
+ /**
+ * Get the current size of the buffer.
+ */
+ public int getSize() {
+ if (this.bytes == null) {
+ throw new IllegalStateException("Uninitialiized. Null constructor " +
+ "called w/o accompaying readFields invocation");
+ }
+ return this.bytes.length;
+ }
+
+
+ // inherit javadoc
+ public void readFields(final DataInput in) throws IOException {
+ this.bytes = new byte[in.readInt()];
+ in.readFully(this.bytes, 0, this.bytes.length);
+ }
+
+ // inherit javadoc
+ public void write(final DataOutput out) throws IOException {
+ out.writeInt(this.bytes.length);
+ out.write(this.bytes, 0, this.bytes.length);
+ }
+
+ // Below methods copied from BytesWritable
+
+ public int hashCode() {
+ return WritableComparator.hashBytes(bytes, this.bytes.length);
+ }
+
+ /**
+ * Define the sort order of the BytesWritable.
+ * @param right_obj The other bytes writable
+ * @return Positive if left is bigger than right, 0 if they are equal, and
+ * negative if left is smaller than right.
+ */
+ public int compareTo(Object right_obj) {
+ return compareTo(((ImmutableBytesWritable)right_obj).get());
+ }
+
+ public int compareTo(final byte [] that) {
+ int diff = this.bytes.length - that.length;
+ return (diff != 0)?
+ diff:
+ WritableComparator.compareBytes(this.bytes, 0, this.bytes.length, that,
+ 0, that.length);
+ }
+
+ /**
+ * Are the two byte sequences equal?
+ */
+ public boolean equals(Object right_obj) {
+ if (right_obj instanceof ImmutableBytesWritable) {
+ return compareTo(right_obj) == 0;
+ }
+ return false;
+ }
+
+ /**
+ * Generate the stream of bytes as hex pairs separated by ' '.
+ */
+ public String toString() {
+ StringBuffer sb = new StringBuffer(3*this.bytes.length);
+ for (int idx = 0; idx < this.bytes.length; idx++) {
+ // if not the first, put a blank separator in
+ if (idx != 0) {
+ sb.append(' ');
+ }
+ String num = Integer.toHexString(bytes[idx]);
+ // if it is only one digit, add a leading 0.
+ if (num.length() < 2) {
+ sb.append('0');
+ }
+ sb.append(num);
+ }
+ return sb.toString();
+ }
+
+ /** A Comparator optimized for ImmutableBytesWritable.
+ */
+ public static class Comparator extends WritableComparator {
+ private BytesWritable.Comparator comparator =
+ new BytesWritable.Comparator();
+
+ public Comparator() {
+ super(ImmutableBytesWritable.class);
+ }
+
+ /**
+ * Compare the buffers in serialized form.
+ */
+ public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) {
+ return comparator.compare(b1, s1, l1, b2, s2, l2);
+ }
+ }
+
+ static { // register this comparator
+ WritableComparator.define(ImmutableBytesWritable.class, new Comparator());
+ }
+
+ /**
+ * @param array List of byte [].
+ * @return Array of byte [].
+ */
+ public static byte [][] toArray(final List<byte []> array) {
+ // List#toArray doesn't work on lists of byte [].
+ byte[][] results = new byte[array.size()][];
+ for (int i = 0; i < array.size(); i++) {
+ results[i] = array.get(i);
+ }
+ return results;
+ }
+}
\ No newline at end of file
