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.piggybank.test.storage; import static org.apache.pig.ExecType.LOCAL; import java.io.ByteArrayInputStream; import java.io.File; import java.io.PrintStream; import java.util.ArrayList; import java.util.Iterator; import java.util.Random; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import junit.framework.TestCase; import org.apache.commons.compress.compressors.bzip2.BZip2CompressorOutputStream; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FSDataOutputStream; import org.apache.hadoop.fs.FileStatus; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; import org.apache.pig.ExecType; import org.apache.pig.PigServer; import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MRConfiguration; import org.apache.pig.data.Tuple; import org.apache.pig.test.Util; import org.w3c.dom.Document; public class TestXMLLoader extends TestCase { public static ArrayList<String[]> data = new ArrayList<String[]>(); static { data.add(new String[] { "<configuration>" }); data.add(new String[] { "<property>" }); data.add(new String[] { "<name> foobar </name>" }); data.add(new String[] { "<value> barfoo </value>" }); data.add(new String[] { "</property>" }); data.add(new String[] { "<ignoreProperty>" }); data.add(new String[] { "<name> foo </name>" }); data.add(new String[] { "</ignoreProperty>" }); data.add(new String[] { "<property>" }); data.add(new String[] { "<name> justname </name>" }); data.add(new String[] { "</property>" }); data.add(new String[] { "</configuration>" }); } public static ArrayList<String[]> nestedTags = new ArrayList<String[]>(); static { nestedTags.add(new String[] { "<events>" }); nestedTags.add(new String[] { "<event id='116913365'>" }); nestedTags.add(new String[] { "<eventRank>1.000000000000</eventRank>" }); nestedTags.add(new String[] { "<name>XY</name>" }); nestedTags.add(new String[] { "<relatedEvents>" }); nestedTags.add(new String[] { "<event id='116913365'>x</event>" }); nestedTags.add(new String[] { "<event id='116913365'>y</event>" }); nestedTags.add(new String[] { "</relatedEvents>" }); nestedTags.add(new String[] { "</event>" }); nestedTags.add(new String[] { "<event id='116913365'>" }); nestedTags.add(new String[] { "<eventRank>3.0000</eventRank>" }); nestedTags.add(new String[] { "<name>AB</name>" }); nestedTags.add(new String[] { "<relatedEvents>" }); nestedTags.add(new String[] { "<event id='116913365'>a</event>" }); nestedTags.add(new String[] { "<event id='116913365'>b</event>" }); nestedTags.add(new String[] { "</relatedEvents>" }); nestedTags.add(new String[] { "</event>" }); nestedTags.add(new String[] { "<event>" }); nestedTags.add(new String[] { "<eventRank>4.0000</eventRank>" }); nestedTags.add(new String[] { "<name>CD</name>" }); nestedTags.add(new String[] { "<relatedEvents>" }); nestedTags.add(new String[] { "<event>c</event>" }); nestedTags.add(new String[] { "<event>d</event>" }); nestedTags.add(new String[] { "</relatedEvents>" }); nestedTags.add(new String[] { "</event>" }); nestedTags.add(new String[] { "</events>" }); } public static ArrayList<String[]> inlineClosedTags = new ArrayList<String[]>(); static { inlineClosedTags.add(new String[] { "<events>" }); inlineClosedTags.add(new String[] { "<event id='3423'/>" }); inlineClosedTags.add(new String[] { "<event/>" }); inlineClosedTags.add(new String[] { "<event><event/></event>" }); inlineClosedTags.add(new String[] { "<event id='33'><tag k='a' v='b'/></event>" }); inlineClosedTags.add(new String[] { "</events>" }); } public void testShouldReturn0TupleCountIfSearchTagIsNotFound() throws Exception { String filename = TestHelper.createTempFile(data, ""); PigServer pig = new PigServer(LOCAL); filename = filename.replace("\\", "\\\\"); String query = "A = LOAD '" + filename + "' USING org.apache.pig.piggybank.storage.XMLLoader('invalid') as (doc:chararray);"; pig.registerQuery(query); Iterator<?> it = pig.openIterator("A"); int tupleCount = 0; while (it.hasNext()) { Tuple tuple = (Tuple) it.next(); if (tuple == null) break; else { if (tuple.size() > 0) { tupleCount++; } } } assertEquals(0, tupleCount); } public void testLoadXMLLoader() throws Exception { //ArrayList<DataByteArray[]> expected = TestHelper.getExpected(data, pattern); String filename = TestHelper.createTempFile(data, ""); PigServer pig = new PigServer(LOCAL); filename = filename.replace("\\", "\\\\"); String query = "A = LOAD '" + filename + "' USING org.apache.pig.piggybank.storage.XMLLoader('property') as (doc:chararray);"; pig.registerQuery(query); Iterator<?> it = pig.openIterator("A"); int tupleCount = 0; while (it.hasNext()) { Tuple tuple = (Tuple) it.next(); if (tuple == null) break; else { if (tuple.size() > 0) { tupleCount++; } } } assertEquals(2, tupleCount); } public void testXMLLoaderShouldLoadBasicBzip2Files() throws Exception { String filename = TestHelper.createTempFile(data, ""); Process bzipProc = Runtime.getRuntime().exec("bzip2 " + filename); int waitFor = bzipProc.waitFor(); if (waitFor != 0) { fail("Failed to create the class"); } filename = filename + ".bz2"; try { PigServer pigServer = new PigServer(ExecType.LOCAL); String loadQuery = "A = LOAD '" + Util.encodeEscape(filename) + "' USING org.apache.pig.piggybank.storage.XMLLoader('property') as (doc:chararray);"; pigServer.registerQuery(loadQuery); Iterator<Tuple> it = pigServer.openIterator("A"); int tupleCount = 0; while (it.hasNext()) { Tuple tuple = (Tuple) it.next(); if (tuple == null) break; else { //TestHelper.examineTuple(expected, tuple, tupleCount); if (tuple.size() > 0) { tupleCount++; } } } assertEquals(2, tupleCount); } finally { new File(filename).delete(); } } public void testLoaderShouldLoadBasicGzFile() throws Exception { String filename = TestHelper.createTempFile(data, ""); Process bzipProc = Runtime.getRuntime().exec("gzip " + filename); int waitFor = bzipProc.waitFor(); if (waitFor != 0) { fail("Failed to create the class"); } filename = filename + ".gz"; try { PigServer pigServer = new PigServer(ExecType.LOCAL); String loadQuery = "A = LOAD '" + Util.encodeEscape(filename) + "' USING org.apache.pig.piggybank.storage.XMLLoader('property') as (doc:chararray);"; pigServer.registerQuery(loadQuery); Iterator<Tuple> it = pigServer.openIterator("A"); int tupleCount = 0; while (it.hasNext()) { Tuple tuple = (Tuple) it.next(); if (tuple == null) break; else { if (tuple.size() > 0) { tupleCount++; } } } assertEquals(2, tupleCount); } finally { new File(filename).delete(); } } public void testXMLLoaderShouldNotConfusedWithTagsHavingSimilarPrefix() throws Exception { ArrayList<String[]> testData = new ArrayList<String[]>(); testData.add(new String[] { "<namethisalso> foobar9 </namethisalso>" }); testData.addAll(data); String filename = TestHelper.createTempFile(testData, ""); PigServer pig = new PigServer(LOCAL); filename = filename.replace("\\", "\\\\"); String query = "A = LOAD '" + filename + "' USING org.apache.pig.piggybank.storage.XMLLoader('name') as (doc:chararray);"; pig.registerQuery(query); Iterator<?> it = pig.openIterator("A"); int tupleCount = 0; while (it.hasNext()) { Tuple tuple = (Tuple) it.next(); if (tuple == null) break; else { if (tuple.size() > 0) { tupleCount++; } } } assertEquals(3, tupleCount); } public void testShouldReturn1ForIntermediateTagData() throws Exception { String filename = TestHelper.createTempFile(data, ""); PigServer pig = new PigServer(LOCAL); filename = filename.replace("\\", "\\\\"); String query = "A = LOAD '" + filename + "' USING org.apache.pig.piggybank.storage.XMLLoader('ignoreProperty') as (doc:chararray);"; pig.registerQuery(query); Iterator<?> it = pig.openIterator("A"); int tupleCount = 0; while (it.hasNext()) { Tuple tuple = (Tuple) it.next(); if (tuple == null) break; else { if (tuple.size() > 0) { tupleCount++; } } } assertEquals(1, tupleCount); } public void testShouldReturn0TupleCountIfNoEndTagIsFound() throws Exception { // modify the data content to avoid end tag for </ignoreProperty> ArrayList<String[]> testData = new ArrayList<String[]>(); for (String content[] : data) { if (!content[0].equals("</ignoreProperty>")) { testData.add(content); } } String filename = TestHelper.createTempFile(testData, ""); PigServer pig = new PigServer(LOCAL); filename = filename.replace("\\", "\\\\"); String query = "A = LOAD '" + filename + "' USING org.apache.pig.piggybank.storage.XMLLoader('ignoreProperty') as (doc:chararray);"; pig.registerQuery(query); Iterator<?> it = pig.openIterator("A"); int tupleCount = 0; while (it.hasNext()) { Tuple tuple = (Tuple) it.next(); if (tuple == null) break; else { if (tuple.size() > 0) { tupleCount++; } } } assertEquals(0, tupleCount); } public void testShouldReturn0TupleCountIfEmptyFileIsPassed() throws Exception { // modify the data content to avoid end tag for </ignoreProperty> ArrayList<String[]> testData = new ArrayList<String[]>(); String filename = TestHelper.createTempFile(testData, ""); PigServer pig = new PigServer(LOCAL); filename = filename.replace("\\", "\\\\"); String query = "A = LOAD '" + filename + "' USING org.apache.pig.piggybank.storage.XMLLoader('ignoreProperty') as (doc:chararray);"; pig.registerQuery(query); Iterator<?> it = pig.openIterator("A"); int tupleCount = 0; while (it.hasNext()) { Tuple tuple = (Tuple) it.next(); if (tuple == null) break; else { if (tuple.size() > 0) { tupleCount++; } } } assertEquals(0, tupleCount); } public void testXMLLoaderShouldSupportNestedTagWithSameName() throws Exception { String filename = TestHelper.createTempFile(nestedTags, ""); PigServer pig = new PigServer(LOCAL); filename = filename.replace("\\", "\\\\"); String query = "A = LOAD '" + filename + "' USING org.apache.pig.piggybank.storage.XMLLoader('event') as (doc:chararray);"; pig.registerQuery(query); Iterator<?> it = pig.openIterator("A"); int tupleCount = 0; while (it.hasNext()) { Tuple tuple = (Tuple) it.next(); if (tuple == null) break; else { if (tuple.size() > 0) { tupleCount++; } } } assertEquals(3, tupleCount); } public void testXMLLoaderShouldWorkWithInlineClosedTags() throws Exception { String filename = TestHelper.createTempFile(inlineClosedTags, ""); PigServer pig = new PigServer(LOCAL); filename = filename.replace("\\", "\\\\"); String query = "A = LOAD '" + filename + "' USING org.apache.pig.piggybank.storage.XMLLoader('event') as (doc:chararray);"; pig.registerQuery(query); Iterator<?> it = pig.openIterator("A"); int tupleCount = 0; while (it.hasNext()) { Tuple tuple = (Tuple) it.next(); if (tuple == null) break; else { if (tuple.size() > 0) { tupleCount++; } } } assertEquals(4, tupleCount); } public void testXMLLoaderShouldReturnValidXML() throws Exception { String filename = TestHelper.createTempFile(inlineClosedTags, ""); PigServer pig = new PigServer(LOCAL); filename = filename.replace("\\", "\\\\"); String query = "A = LOAD '" + filename + "' USING org.apache.pig.piggybank.storage.XMLLoader('event') as (doc:chararray);"; pig.registerQuery(query); Iterator<?> it = pig.openIterator("A"); while (it.hasNext()) { Tuple tuple = (Tuple) it.next(); if (tuple == null) break; else { // Test it returns a valid XML DocumentBuilder docBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder(); docBuilder.parse(new ByteArrayInputStream(((String) tuple.get(0)).getBytes())); } } } /** * This test case test the special case when a non-matching tag spans two file * splits in a .bz2 compressed file. At the same time, the part that falls in * the first split is a prefix of the matching tag. * In other words, till the end of the first split, it looks like the tag is * matching but it is not actually matching. * * @throws Exception */ public void testXMLLoaderShouldNotReturnLastNonMatchedTag() throws Exception { Configuration conf = new Configuration(); long blockSize = 100 * 1024; conf.setLong("fs.local.block.size", blockSize); String tagName = "event"; PigServer pig = new PigServer(LOCAL, conf); FileSystem localFs = FileSystem.getLocal(conf); FileStatus[] testFiles = localFs .globStatus(new Path("src/test/java/org/apache/pig/piggybank/test/evaluation/xml/data/*xml.bz2")); assertTrue("No test files", testFiles.length > 0); for (FileStatus testFile : testFiles) { String testFileName = testFile.getPath().toUri().getPath().replace("\\", "\\\\"); String query = "A = LOAD '" + testFileName + "' USING org.apache.pig.piggybank.storage.XMLLoader('event') as (doc:chararray);"; pig.registerQuery(query); Iterator<?> it = pig.openIterator("A"); while (it.hasNext()) { Tuple tuple = (Tuple) it.next(); if (tuple == null) break; else { if (tuple.size() > 0) { assertTrue(((String) tuple.get(0)).startsWith("<" + tagName + ">")); } } } } } /** * This test checks that a multi-line tag spanning two splits should be * matched. * @throws Exception */ public void testXMLLoaderShouldMatchTagSpanningSplits() throws Exception { Configuration conf = new Configuration(); long blockSize = 512; conf.setLong("fs.local.block.size", blockSize); conf.setLong(MRConfiguration.MAX_SPLIT_SIZE, blockSize); String tagName = "event"; File tempFile = File.createTempFile("long-file", ".xml"); FileSystem localFs = FileSystem.getLocal(conf); FSDataOutputStream directOut = localFs.create(new Path(tempFile.getAbsolutePath()), true); String matchingElement = "<event>\ndata\n</event>\n"; long pos = 0; int matchingCount = 0; PrintStream ps = new PrintStream(directOut); // 1- Write some elements that fit completely in the first block while (pos + 2 * matchingElement.length() < blockSize) { ps.print(matchingElement); pos += matchingElement.length(); matchingCount++; } // 2- Write a long element that spans multiple lines and multiple blocks String longElement = matchingElement.replace("data", "data\ndata\ndata\ndata\ndata\ndata\ndata\ndata\ndata\ndata\ndata\n"); ps.print(longElement); pos += longElement.length(); matchingCount++; // 3- Write some more elements to fill in the second block completely while (pos < 2 * blockSize) { ps.print(matchingElement); pos += matchingElement.length(); matchingCount++; } ps.close(); PigServer pig = new PigServer(LOCAL, conf); String tempFileName = tempFile.getAbsolutePath().replace("\\", "\\\\"); String query = "A = LOAD '" + tempFileName + "' USING org.apache.pig.piggybank.storage.XMLLoader('event') as (doc:chararray);"; pig.registerQuery(query); Iterator<?> it = pig.openIterator("A"); int count = 0; while (it.hasNext()) { Tuple tuple = (Tuple) it.next(); if (tuple == null) break; else { if (tuple.size() > 0) { count++; // Make sure the returned text is a proper XML element DocumentBuilder docBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder(); Document doc = docBuilder.parse(new ByteArrayInputStream(((String) tuple.get(0)).getBytes())); assertTrue(doc.getDocumentElement().getNodeName().equals(tagName)); } } } assertEquals(matchingCount, count); } }