org.apache.bigtop.itest.datafu.PigTests.java Source code

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Here is the source code for org.apache.bigtop.itest.datafu.PigTests.java

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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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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.bigtop.itest.datafu;

import static org.junit.Assert.*;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.FilenameFilter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Pattern;

import org.apache.commons.io.IOUtils;
import org.apache.pig.data.Tuple;
import org.apache.pig.pigunit.PigTest;
import org.apache.pig.tools.parameters.ParseException;

public abstract class PigTests {
    protected String[] getDefaultArgs() {
        String[] args = { "JAR_PATH=" + getJarPath() };
        return args;
    }

    protected List<String> getDefaultArgsAsList() {
        String[] args = getDefaultArgs();
        List<String> argsList = new ArrayList<String>(args.length);
        for (String arg : args) {
            argsList.add(arg);
        }
        return argsList;
    }

    protected PigTest createPigTest(String scriptPath, String... args) throws IOException {
        // append args to list of default args
        List<String> theArgs = getDefaultArgsAsList();
        for (String arg : args) {
            theArgs.add(arg);
        }

        String[] lines = getLinesFromFile(scriptPath);

        for (String arg : theArgs) {
            String[] parts = arg.split("=", 2);
            if (parts.length == 2) {
                for (int i = 0; i < lines.length; i++) {
                    lines[i] = lines[i].replaceAll(Pattern.quote("$" + parts[0]), parts[1]);
                }
            }
        }

        return new PigTest(lines);
    }

    protected PigTest createPigTest(String scriptPath) throws IOException {
        return createPigTest(scriptPath, getDefaultArgs());
    }

    protected String getJarPath() {
        String jarDir = "dist";
        if (System.getProperty("datafu.jar.dir") != null) {
            jarDir = System.getProperty("datafu.jar.dir");
        }

        String jarDirPath = new File(/* System.getProperty("user.dir"), */ jarDir).getAbsolutePath();

        File userDir = new File(jarDirPath);

        String[] files = userDir.list(new FilenameFilter() {

            @Override
            public boolean accept(File dir, String name) {
                return name.startsWith("datafu") && name.endsWith(".jar") && !name.contains("sources")
                        && !name.contains("javadoc");
            }

        });

        if (files.length == 0) {
            throw new RuntimeException("Could not find JAR file");
        } else if (files.length > 1) {
            throw new RuntimeException("Found more JAR files than expected");
        }

        return userDir.getAbsolutePath() + "/" + files[0];
    }

    protected List<Tuple> getLinesForAlias(PigTest test, String alias) throws IOException, ParseException {
        return getLinesForAlias(test, alias, true);
    }

    protected List<Tuple> getLinesForAlias(PigTest test, String alias, boolean logValues)
            throws IOException, ParseException {
        Iterator<Tuple> tuplesIterator = test.getAlias(alias);
        List<Tuple> tuples = new ArrayList<Tuple>();
        if (logValues) {
            System.out.println(String.format("Values for %s: ", alias));
        }
        while (tuplesIterator.hasNext()) {
            Tuple tuple = tuplesIterator.next();
            if (logValues) {
                System.out.println(tuple.toString());
            }
            tuples.add(tuple);
        }
        return tuples;
    }

    protected void writeLinesToFile(String fileName, String... lines) throws IOException {
        File inputFile = deleteIfExists(getFile(fileName));
        writeLinesToFile(inputFile, lines);
    }

    protected void writeLinesToFile(File file, String[] lines) throws IOException {
        FileWriter writer = new FileWriter(file);
        for (String line : lines) {
            writer.write(line + "\n");
        }
        writer.close();
    }

    protected void assertOutput(PigTest test, String alias, String... expected) throws IOException, ParseException {
        List<Tuple> tuples = getLinesForAlias(test, alias);
        assertEquals(expected.length, tuples.size());
        int i = 0;
        for (String e : expected) {
            assertEquals(tuples.get(i++).toString(), e);
        }
    }

    protected File deleteIfExists(File file) {
        if (file.exists()) {
            file.delete();
        }
        return file;
    }

    protected File getFile(String fileName) {
        return new File(System.getProperty("user.dir"), fileName).getAbsoluteFile();
    }

    /**
     * Gets the lines from a given file.
     * 
     * @param relativeFilePath The path relative to the datafu-tests project.
     * @return The lines from the file
     * @throws IOException
     */
    protected String[] getLinesFromFile(String relativeFilePath) throws IOException {
        // assume that the working directory is the datafu-tests project
        File file = new File(System.getProperty("user.dir"), relativeFilePath).getAbsoluteFile();
        BufferedInputStream content = new BufferedInputStream(new FileInputStream(file));
        Object[] lines = IOUtils.readLines(content).toArray();
        String[] result = new String[lines.length];
        for (int i = 0; i < lines.length; i++) {
            result[i] = (String) lines[i];
        }
        return result;
    }
}