TestWritable.java
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上传日期:2018-01-08
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- /**
- * 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.*;
- import java.util.Random;
- import org.apache.hadoop.conf.Configurable;
- import org.apache.hadoop.conf.Configuration;
- import org.apache.hadoop.util.ReflectionUtils;
- import junit.framework.TestCase;
- /** Unit tests for Writable. */
- public class TestWritable extends TestCase {
- public TestWritable(String name) { super(name); }
- /** Example class used in test cases below. */
- public static class SimpleWritable implements Writable {
- private static final Random RANDOM = new Random();
- int state = RANDOM.nextInt();
- public void write(DataOutput out) throws IOException {
- out.writeInt(state);
- }
- public void readFields(DataInput in) throws IOException {
- this.state = in.readInt();
- }
- public static SimpleWritable read(DataInput in) throws IOException {
- SimpleWritable result = new SimpleWritable();
- result.readFields(in);
- return result;
- }
- /** Required by test code, below. */
- public boolean equals(Object o) {
- if (!(o instanceof SimpleWritable))
- return false;
- SimpleWritable other = (SimpleWritable)o;
- return this.state == other.state;
- }
- }
- /** Test 1: Check that SimpleWritable. */
- public void testSimpleWritable() throws Exception {
- testWritable(new SimpleWritable());
- }
-
- public void testByteWritable() throws Exception {
- testWritable(new ByteWritable((byte)128));
- }
- public void testDoubleWritable() throws Exception {
- testWritable(new DoubleWritable(1.0));
- }
- /** Utility method for testing writables. */
- public static Writable testWritable(Writable before)
- throws Exception {
- return testWritable(before, null);
- }
-
- /** Utility method for testing writables. */
- public static Writable testWritable(Writable before
- , Configuration conf) throws Exception {
- DataOutputBuffer dob = new DataOutputBuffer();
- before.write(dob);
- DataInputBuffer dib = new DataInputBuffer();
- dib.reset(dob.getData(), dob.getLength());
-
- Writable after = (Writable)ReflectionUtils.newInstance(
- before.getClass(), conf);
- after.readFields(dib);
- assertEquals(before, after);
- return after;
- }
-
- }