/*
* 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.test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.util.Iterator;
import org.apache.pig.EvalFunc;
import org.apache.pig.ExecType;
import org.apache.pig.PigServer;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.data.Tuple;
import org.apache.pig.data.TupleFactory;
import org.apache.pig.test.utils.FILTERFROMFILE;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.Test;
public class TestFilterUDF {
private PigServer pigServer;
private static MiniCluster cluster = MiniCluster.buildCluster();
private File tmpFile;
TupleFactory tf = TupleFactory.getInstance();
public TestFilterUDF() throws ExecException, IOException {
int LOOP_SIZE = 20;
tmpFile = File.createTempFile("test", "txt");
PrintStream ps = new PrintStream(new FileOutputStream(tmpFile));
for (int i = 1; i <= LOOP_SIZE; i++) {
ps.println(i);
}
ps.close();
}
@Before
public void setUp() throws Exception {
pigServer = new PigServer(ExecType.MAPREDUCE, cluster.getProperties());
int LOOP_SIZE = 20;
tmpFile = File.createTempFile("test", "txt");
PrintStream ps = new PrintStream(new FileOutputStream(tmpFile));
for (int i = 1; i <= LOOP_SIZE; i++) {
ps.println(i);
}
ps.close();
}
@After
public void tearDown() throws Exception {
tmpFile.delete();
}
@AfterClass
public static void oneTimeTearDown() throws Exception {
cluster.shutDown();
}
private File createFile(String[] data) throws Exception {
File f = File.createTempFile("tmp", "");
PrintWriter pw = new PrintWriter(f);
for (int i = 0; i < data.length; i++) {
pw.println(data[i]);
}
pw.close();
return f;
}
static public class MyFilterFunction extends EvalFunc<Boolean> {
@Override
public Boolean exec(Tuple input) throws IOException {
try {
int col = (Integer)input.get(0);
if (col > 10)
return true;
} catch (ExecException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return false;
}
}
@Test
public void testFilterUDF() throws Exception {
pigServer.registerQuery("A = LOAD '"
+ Util.generateURI(tmpFile.toString(), pigServer.getPigContext())
+ "' as (x:int);");
pigServer.registerQuery("B = filter A by " + MyFilterFunction.class.getName() + "($0);");
Iterator<Tuple> iter = pigServer.openIterator("B");
assertTrue("No Output received", iter.hasNext());
int cnt = 0;
while (iter.hasNext()) {
Tuple t = iter.next();
assertEquals(true, (Integer)t.get(0) > 10);
++cnt;
}
assertEquals(10, cnt);
}
@Test
public void testFilterUDFusingDefine() throws Exception {
File inputFile = createFile(
new String[] {
"www.paulisageek.com\t4",
"www.yahoo.com\t12344",
"google.com\t1",
"us2.amazon.com\t4141"
}
);
File filterFile = createFile(
new String[] {
"12344"
}
);
pigServer.registerQuery("define FILTER_CRITERION "
+ FILTERFROMFILE.class.getName()
+ "('"
+ Util.generateURI(filterFile.toString(), pigServer
.getPigContext()) + "');");
pigServer.registerQuery("a = LOAD '"
+ Util.generateURI(inputFile.toString(), pigServer
.getPigContext())
+ "' as (url:chararray, numvisits:int);");
pigServer.registerQuery("b = filter a by FILTER_CRITERION(numvisits);");
Tuple expectedTuple = tf.newTuple();
expectedTuple.append(new String("www.yahoo.com"));
expectedTuple.append(new Integer("12344"));
Iterator<Tuple> iter = pigServer.openIterator("b");
while (iter.hasNext()) {
Tuple t = iter.next();
assertTrue(t.equals(expectedTuple));
}
}
@Test
public void testFilterUDFusingDefine2() throws Exception {
File inputFile = createFile(
new String[] {
"www.paulisageek.com\t4",
"www.yahoo.com\t12344",
"google.com\t1",
"us2.amazon.com\t4141"
}
);
File filterFile = createFile(
new String[] {
"12344"
}
);
pigServer.registerQuery("define FILTER_CRITERION "
+ FILTERFROMFILE.class.getName()
+ "('"
+ Util.generateURI(filterFile.toString(), pigServer
.getPigContext()) + "');");
pigServer.registerQuery("a = LOAD '"
+ Util.generateURI(inputFile.toString(), pigServer
.getPigContext())
+ "' as (url:chararray, numvisits:int);");
pigServer.registerQuery("b = filter a by FILTER_CRITERION(numvisits) AND FILTER_CRITERION(numvisits);");
Tuple expectedTuple = tf.newTuple();
expectedTuple.append(new String("www.yahoo.com"));
expectedTuple.append(new Integer("12344"));
Iterator<Tuple> iter = pigServer.openIterator("b");
while (iter.hasNext()) {
Tuple t = iter.next();
assertTrue(t.equals(expectedTuple));
}
}
}