Java tutorial
/* * 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.assertNull; import java.io.File; import java.io.FileOutputStream; import java.io.PrintStream; import java.util.Iterator; import java.util.Random; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.pig.PigServer; import org.apache.pig.builtin.PigStorage; import org.apache.pig.data.DataType; import org.apache.pig.data.Tuple; import org.junit.Before; import org.junit.Test; public class TestInfixArithmetic { private final Log log = LogFactory.getLog(getClass()); private static int LOOP_COUNT = 1024; private PigServer pig; @Before public void setUp() throws Exception { pig = new PigServer(Util.getLocalTestMode()); } Boolean[] nullFlags = new Boolean[] { false, true }; @Test public void testAdd() throws Throwable { File tmpFile = File.createTempFile("test", "txt"); for (int i = 0; i < nullFlags.length; i++) { System.err.println("Testing with nulls: " + nullFlags[i]); PrintStream ps = new PrintStream(new FileOutputStream(tmpFile)); generateInput(ps, nullFlags[i]); String query = "A = foreach (load '" + Util.encodeEscape(Util.generateURI(tmpFile.toString(), pig.getPigContext())) + "' using " + PigStorage.class.getName() + "(':')) generate $0, $0 + $1, $1;"; log.info(query); pig.registerQuery(query); Iterator<Tuple> it = pig.openIterator("A"); tmpFile.delete(); while (it.hasNext()) { Tuple t = it.next(); Double first = (t.get(0) == null ? null : DataType.toDouble(t.get(0))); Double second = (t.get(1) == null ? null : DataType.toDouble(t.get(1))); Double third = (t.get(2) == null ? null : DataType.toDouble(t.get(2))); if (first != null && third != null) { assertEquals(Double.valueOf(first + first), second); } else { assertNull(second); } } } } @Test public void testSubtract() throws Throwable { File tmpFile = File.createTempFile("test", "txt"); for (int i = 0; i < nullFlags.length; i++) { System.err.println("Testing with nulls: " + nullFlags[i]); PrintStream ps = new PrintStream(new FileOutputStream(tmpFile)); generateInput(ps, nullFlags[i]); String query = "A = foreach (load '" + Util.encodeEscape(Util.generateURI(tmpFile.toString(), pig.getPigContext())) + "' using " + PigStorage.class.getName() + "(':')) generate $0, $0 - $1, $1 ;"; log.info(query); pig.registerQuery(query); Iterator<Tuple> it = pig.openIterator("A"); tmpFile.delete(); while (it.hasNext()) { Tuple t = it.next(); Double first = (t.get(0) == null ? null : DataType.toDouble(t.get(0))); Double second = (t.get(1) == null ? null : DataType.toDouble(t.get(1))); Double third = (t.get(2) == null ? null : DataType.toDouble(t.get(2))); if (first != null && third != null) { assertEquals(Double.valueOf(0.0), second); } else { assertNull(second); } } } } @Test public void testMultiply() throws Throwable { File tmpFile = File.createTempFile("test", "txt"); for (int i = 0; i < nullFlags.length; i++) { System.err.println("Testing with nulls: " + nullFlags[i]); PrintStream ps = new PrintStream(new FileOutputStream(tmpFile)); generateInput(ps, nullFlags[i]); String query = "A = foreach (load '" + Util.encodeEscape(Util.generateURI(tmpFile.toString(), pig.getPigContext())) + "' using " + PigStorage.class.getName() + "(':')) generate $0, $0 * $1, $1 ;"; log.info(query); pig.registerQuery(query); Iterator<Tuple> it = pig.openIterator("A"); tmpFile.delete(); while (it.hasNext()) { Tuple t = it.next(); Double first = (t.get(0) == null ? null : DataType.toDouble(t.get(0))); Double second = (t.get(1) == null ? null : DataType.toDouble(t.get(1))); Double third = (t.get(2) == null ? null : DataType.toDouble(t.get(2))); if (first != null && third != null) { assertEquals(Double.valueOf(first * first), second); } else { assertNull(second); } } } } @Test public void testDivide() throws Throwable { File tmpFile = File.createTempFile("test", "txt"); for (int i = 0; i < nullFlags.length; i++) { System.err.println("Testing with nulls: " + nullFlags[i]); PrintStream ps = new PrintStream(new FileOutputStream(tmpFile)); generateInput(ps, nullFlags[i]); String query = "A = foreach (load '" + Util.encodeEscape(Util.generateURI(tmpFile.toString(), pig.getPigContext())) + "' using " + PigStorage.class.getName() + "(':')) generate $0, $0 / $1, $1 ;"; log.info(query); pig.registerQuery(query); Iterator<Tuple> it = pig.openIterator("A"); tmpFile.delete(); while (it.hasNext()) { Tuple t = it.next(); Double first = (t.get(0) == null ? null : DataType.toDouble(t.get(0))); Double second = (t.get(1) == null ? null : DataType.toDouble(t.get(1))); Double third = (t.get(2) == null ? null : DataType.toDouble(t.get(2))); if (first != null && third != null) { assertEquals(Double.valueOf(1.0), second); } else { assertNull(second); } } } } private void generateInput(PrintStream ps, boolean withNulls) { if (withNulls) { // inject nulls randomly for (int i = 1; i < LOOP_COUNT; i++) { int rand = new Random().nextInt(LOOP_COUNT); if (rand <= (0.2 * LOOP_COUNT)) { ps.println(":" + i); } else if (rand > (0.2 * LOOP_COUNT) && rand <= (0.4 * LOOP_COUNT)) { ps.println(i + ":"); } else if (rand > (0.2 * LOOP_COUNT) && rand <= (0.4 * LOOP_COUNT)) { ps.println(":"); } else { ps.println(i + ":" + i); } } } else { for (int i = 1; i < LOOP_COUNT; i++) { ps.println(i + ":" + i); } } ps.close(); } }