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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.pig;
import org.apache.hadoop.mapreduce.Job;
import org.junit.Test;
import java.io.IOException;
import java.util.NoSuchElementException;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
/**
* Tests that the LoadFuncMetadataWrapper properly wraps objects that extends
* LoadFunc and implements LoadtMetadata
*/
public class TestLoadFuncMetadataWrapper {
// Asserts that each call to a Wrapper invokes the correct method on the Wrappee.
@Test
public void testSucess() throws IOException {
DummyLoadMetadata loadFunc = new DummyLoadMetadata();
MockWrapper wrapper = new MockWrapper(loadFunc);
wrapper.getSchema(null, null);
assertEquals("getSchema", loadFunc.getLastMethodCalled());
wrapper.getStatistics(null, null);
assertEquals("getStatistics", loadFunc.getLastMethodCalled());
wrapper.getPartitionKeys(null, null);
assertEquals("getPartitionKeys", loadFunc.getLastMethodCalled());
wrapper.setPartitionFilter(null);
assertEquals("setPartitionFilter", loadFunc.getLastMethodCalled());
wrapper.relativeToAbsolutePath(null,null);
assertEquals("relativeToAbsolutePath", loadFunc.getLastMethodCalled());
wrapper.setLocation(null,null);
assertEquals("setLocation", loadFunc.getLastMethodCalled());
wrapper.getInputFormat();
assertEquals("getInputFormat", loadFunc.getLastMethodCalled());
wrapper.getLoadCaster();
assertEquals("getLoadCaster", loadFunc.getLastMethodCalled());
wrapper.prepareToRead(null,null);
assertEquals("prepareToRead", loadFunc.getLastMethodCalled());
wrapper.getNext();
assertEquals("getNext", loadFunc.getLastMethodCalled());
wrapper.setUDFContextSignature(null);
assertEquals("setUDFContextSignature", loadFunc.getLastMethodCalled());
NoSuchElementException e = null;
try {
loadFunc.getLastMethodCalled();
} catch (NoSuchElementException ex) {
e = ex;
}
assertNotNull("The wrapped class had more method invokations than it should have", e);
}
// Asserts that each call to an improperly initialized Wrapper fails.
@Test
public void testError() throws IOException {
MockWrapper wrapper = new MockWrapper(); // <-- !! loadFunc not set !!
IllegalArgumentException e = null;
try {
wrapper.getSchema(null, null);
} catch (IllegalArgumentException ex) {
e = ex;
}
assertNotNull("A useful exception should have been thrown when a method is called on an "
+ "improperly initialized LoadFuncMetadataWrapper", e);
assertTrue("The method name that caused the problem should have been mentioned in the "
+ "exception, since the stack trace gets swallowed when this occurs",
e.getMessage().contains("getSchema"));
}
private static class MockWrapper extends LoadFuncMetadataWrapper {
private MockWrapper() { }
private MockWrapper(LoadMetadata loadMetadata) {
setLoadFunc(loadMetadata);
}
}
private static class DummyLoadMetadata extends TestLoadFuncWrapper.DummyLoadFunc
implements LoadMetadata {
@Override
public ResourceSchema getSchema(String location, Job job) throws IOException {
setLastMethodCalled();
return null;
}
@Override
public ResourceStatistics getStatistics(String location, Job job) throws IOException {
setLastMethodCalled();
return null;
}
@Override
public String[] getPartitionKeys(String location, Job job) throws IOException {
setLastMethodCalled();
return null;
}
@Override
public void setPartitionFilter(Expression partitionFilter) throws IOException {
setLastMethodCalled();
}
}
}