| /** |
| * 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.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| import org.apache.hadoop.conf.Configurable; |
| import org.apache.hadoop.conf.Configuration; |
| import org.junit.Before; |
| import org.junit.Test; |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertTrue; |
| import static org.junit.Assert.assertNotNull; |
| import static org.junit.Assert.fail; |
| |
| /** |
| * TestCase for {@link GenericWritable} class. |
| * @see TestWritable#testWritable(Writable) |
| */ |
| public class TestGenericWritable { |
| |
| private Configuration conf; |
| public static final String CONF_TEST_KEY = "test.generic.writable"; |
| public static final String CONF_TEST_VALUE = "dummy"; |
| |
| @Before |
| public void setUp() throws Exception { |
| conf = new Configuration(); |
| //set the configuration parameter |
| conf.set(CONF_TEST_KEY, CONF_TEST_VALUE); |
| } |
| |
| /** Dummy class for testing {@link GenericWritable} */ |
| public static class Foo implements Writable { |
| private String foo = "foo"; |
| @Override |
| public void readFields(DataInput in) throws IOException { |
| foo = Text.readString(in); |
| } |
| @Override |
| public void write(DataOutput out) throws IOException { |
| Text.writeString(out, foo); |
| } |
| @Override |
| public boolean equals(Object obj) { |
| if (!(obj instanceof Foo)) |
| return false; |
| return this.foo.equals(((Foo)obj).foo); |
| } |
| } |
| /** Dummy class for testing {@link GenericWritable} */ |
| public static class Bar implements Writable, Configurable { |
| private int bar = 42; //The Answer to The Ultimate Question Of Life, the Universe and Everything |
| private Configuration conf = null; |
| @Override |
| public void readFields(DataInput in) throws IOException { |
| bar = in.readInt(); |
| } |
| @Override |
| public void write(DataOutput out) throws IOException { |
| out.writeInt(bar); |
| } |
| @Override |
| public Configuration getConf() { |
| return conf; |
| } |
| @Override |
| public void setConf(Configuration conf) { |
| this.conf = conf; |
| } |
| @Override |
| public boolean equals(Object obj) { |
| if (!(obj instanceof Bar)) |
| return false; |
| return this.bar == ((Bar)obj).bar; |
| } |
| } |
| |
| /** Dummy class for testing {@link GenericWritable} */ |
| public static class Baz extends Bar { |
| @Override |
| public void readFields(DataInput in) throws IOException { |
| super.readFields(in); |
| //needs a configuration parameter |
| assertEquals("Configuration is not set for the wrapped object", |
| CONF_TEST_VALUE, getConf().get(CONF_TEST_KEY)); |
| } |
| @Override |
| public void write(DataOutput out) throws IOException { |
| super.write(out); |
| } |
| } |
| |
| /** Dummy class for testing {@link GenericWritable} */ |
| public static class FooGenericWritable extends GenericWritable { |
| @Override |
| @SuppressWarnings("unchecked") |
| protected Class<? extends Writable>[] getTypes() { |
| return new Class[] {Foo.class, Bar.class, Baz.class}; |
| } |
| @Override |
| public boolean equals(Object obj) { |
| if(! (obj instanceof FooGenericWritable)) |
| return false; |
| return get().equals(((FooGenericWritable)obj).get()); |
| } |
| } |
| |
| @Test |
| public void testFooWritable() throws Exception { |
| System.out.println("Testing Writable wrapped in GenericWritable"); |
| FooGenericWritable generic = new FooGenericWritable(); |
| generic.setConf(conf); |
| Foo foo = new Foo(); |
| generic.set(foo); |
| TestWritable.testWritable(generic); |
| } |
| |
| @Test |
| public void testBarWritable() throws Exception { |
| System.out.println("Testing Writable, Configurable wrapped in GenericWritable"); |
| FooGenericWritable generic = new FooGenericWritable(); |
| generic.setConf(conf); |
| Bar bar = new Bar(); |
| bar.setConf(conf); |
| generic.set(bar); |
| |
| //test writing generic writable |
| FooGenericWritable after |
| = (FooGenericWritable)TestWritable.testWritable(generic, conf); |
| |
| //test configuration |
| System.out.println("Testing if Configuration is passed to wrapped classes"); |
| assertTrue(after.get() instanceof Configurable); |
| assertNotNull(((Configurable)after.get()).getConf()); |
| } |
| |
| @Test |
| public void testBazWritable() throws Exception { |
| System.out.println("Testing for GenericWritable to find class names"); |
| FooGenericWritable generic = new FooGenericWritable(); |
| generic.setConf(conf); |
| Baz baz = new Baz(); |
| generic.set(baz); |
| TestWritable.testWritable(generic, conf); |
| } |
| |
| @Test |
| public void testSet() throws Exception { |
| Foo foo = new Foo(); |
| FooGenericWritable generic = new FooGenericWritable(); |
| //exception should not occur |
| generic.set(foo); |
| |
| try { |
| //exception should occur, since IntWritable is not registered |
| generic = new FooGenericWritable(); |
| generic.set(new IntWritable(1)); |
| fail("Generic writable should have thrown an exception for a Writable not registered"); |
| }catch (RuntimeException e) { |
| //ignore |
| } |
| |
| } |
| |
| @Test |
| public void testGet() throws Exception { |
| Foo foo = new Foo(); |
| FooGenericWritable generic = new FooGenericWritable(); |
| generic.set(foo); |
| assertEquals(foo, generic.get()); |
| } |
| |
| } |