HADOOP-850. Add Writable implementations for variable-length integers. Contributed by Andrzej.

git-svn-id: https://svn.apache.org/repos/asf/lucene/hadoop/trunk@492251 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -162,6 +162,9 @@ Trunk (unreleased changes)
 45. HADOOP-745.  Fix a synchronization bug in the HDFS namenode.
     (Dhruba Borthakur via cutting)
 
+46. HADOOP-850.  Add Writable implementations for variable-length
+    integers.  (ab via cutting)
+
 
 Release 0.9.2 - 2006-12-15
 

src/java/org/apache/hadoop/io/VIntWritable.java

@@ -0,0 +1,74 @@
+/**
+ * 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.io;
+
+import java.io.*;
+
+/** A WritableComparable for integer values stored in variable-length format.
+ * Such values take between one and five bytes.  Smaller values take fewer bytes.
+ * 
+ * @author Andrzej Bialecki
+ * @see org.apache.hadoop.io.WritableUtils#readVInt(DataInput)
+ */
+public class VIntWritable implements WritableComparable {
+  private int value;
+
+  public VIntWritable() {}
+
+  public VIntWritable(int value) { set(value); }
+
+  /** Set the value of this VIntWritable. */
+  public void set(int value) { this.value = value; }
+
+  /** Return the value of this VIntWritable. */
+  public int get() { return value; }
+
+  public void readFields(DataInput in) throws IOException {
+    value = WritableUtils.readVInt(in);
+  }
+
+  public void write(DataOutput out) throws IOException {
+    WritableUtils.writeVInt(out, value);
+  }
+
+  /** Returns true iff <code>o</code> is a VIntWritable with the same value. */
+  public boolean equals(Object o) {
+    if (!(o instanceof VIntWritable))
+      return false;
+    VIntWritable other = (VIntWritable)o;
+    return this.value == other.value;
+  }
+
+  public int hashCode() {
+    return (int)value;
+  }
+
+  /** Compares two VIntWritables. */
+  public int compareTo(Object o) {
+    int thisValue = this.value;
+    int thatValue = ((VIntWritable)o).value;
+    return (thisValue < thatValue ? -1 : (thisValue == thatValue ? 0 : 1));
+  }
+
+  public String toString() {
+    return Integer.toString(value);
+  }
+
+}
+

src/java/org/apache/hadoop/io/VLongWritable.java

@@ -0,0 +1,74 @@
+/**
+ * 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.io;
+
+import java.io.*;
+
+/** A WritableComparable for longs in a variable-length format. Such values take
+ *  between one and five bytes.  Smaller values take fewer bytes.
+ *  
+ *  @author Andrzej Bialecki
+ *  @see org.apache.hadoop.io.WritableUtils#readVLong(DataInput)
+ */
+public class VLongWritable implements WritableComparable {
+  private long value;
+
+  public VLongWritable() {}
+
+  public VLongWritable(long value) { set(value); }
+
+  /** Set the value of this LongWritable. */
+  public void set(long value) { this.value = value; }
+
+  /** Return the value of this LongWritable. */
+  public long get() { return value; }
+
+  public void readFields(DataInput in) throws IOException {
+    value = WritableUtils.readVLong(in);
+  }
+
+  public void write(DataOutput out) throws IOException {
+    WritableUtils.writeVLong(out, value);
+  }
+
+  /** Returns true iff <code>o</code> is a VLongWritable with the same value. */
+  public boolean equals(Object o) {
+    if (!(o instanceof VLongWritable))
+      return false;
+    VLongWritable other = (VLongWritable)o;
+    return this.value == other.value;
+  }
+
+  public int hashCode() {
+    return (int)value;
+  }
+
+  /** Compares two VLongWritables. */
+  public int compareTo(Object o) {
+    long thisValue = this.value;
+    long thatValue = ((VLongWritable)o).value;
+    return (thisValue < thatValue ? -1 : (thisValue == thatValue ? 0 : 1));
+  }
+
+  public String toString() {
+    return Long.toString(value);
+  }
+
+}
+