TestBZip.java

/*
 * 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.apache.pig.ExecType.MAPREDUCE;

import java.io.File;
import java.io.FileOutputStream;
import java.util.HashMap;
import java.util.Iterator;

import junit.framework.TestCase;

import org.apache.pig.PigServer;
import org.apache.pig.backend.local.datastorage.LocalSeekableInputStream;
import org.apache.pig.data.DataByteArray;
import org.apache.pig.data.DataType;
import org.apache.pig.data.Tuple;
import org.apache.tools.bzip2r.CBZip2InputStream;
import org.apache.tools.bzip2r.CBZip2OutputStream;
import org.junit.Test;

public class TestBZip extends TestCase {
    MiniCluster cluster = MiniCluster.buildCluster();

    /**
     * Tests the end-to-end writing and reading of a BZip file.
     */
    @Test
    public void testBzipInPig() throws Exception {
        PigServer pig = new PigServer(MAPREDUCE);
        try {
            pig.deleteFile("junit-out.bz");
        } catch (Exception e) {
        }
        File in = File.createTempFile("junit", ".bz");
        in.deleteOnExit();
        File out = File.createTempFile("junit", ".bz");
        out.deleteOnExit();
        out.delete();
        CBZip2OutputStream cos = new CBZip2OutputStream(
                new FileOutputStream(in));
        for (int i = 1; i < 100; i++) {
            cos.write((i + "\n").getBytes());
            cos.write((-i + "\n").getBytes());
        }
        cos.close();
        pig.registerQuery("AA=load '" + Util.generateURI(in.getAbsolutePath()) + "';");
        pig.registerQuery("A=foreach (group (filter AA by $0 > 0) all) generate flatten($1);");
        pig.store("A", Util.generateURI(out.getAbsolutePath()));
        CBZip2InputStream cis = new CBZip2InputStream(
                new LocalSeekableInputStream(new File(out, "part-00000.bz")));
        // Just a sanity check, to make sure it was a bzip file; we
        // will do the value verification later
        assertEquals(100, cis.read(new byte[100]));
        cis.close();
        pig.registerQuery("B=load '" + Util.generateURI(out.getAbsolutePath()) + "';");
        Iterator<Tuple> i = pig.openIterator("B");
        HashMap<Integer, Integer> map = new HashMap<Integer, Integer>();
        while (i.hasNext()) {
            Integer val = DataType.toInteger(i.next().get(0));
            map.put(val, val);
            
        }
        assertEquals(new Integer(99), new Integer(map.keySet().size()));
        for(int j = 1; j < 100; j++) {
          assertEquals(new Integer(j), map.get(j));
        }
        in.delete();
        out.delete();
    }

    /**
     * Tests the end-to-end writing and reading of an empty BZip file.
     */
    @Test
    public void testEmptyBzipInPig() throws Exception {
        PigServer pig = new PigServer(MAPREDUCE);
        try {
            pig.deleteFile("junit-out.bz");
        } catch (Exception e) {
        }
        File in = File.createTempFile("junit", ".tmp");
        in.deleteOnExit();
        File out = File.createTempFile("junit", ".bz");
        out.deleteOnExit();
        out.delete();
        FileOutputStream fos = new FileOutputStream(in);
        fos.write("55\n".getBytes());
        fos.close();
        System.out.println(in.getAbsolutePath());
        pig.registerQuery("AA=load '" + Util.generateURI(in.getAbsolutePath()) + "';");
        pig
                .registerQuery("A=foreach (group (filter AA by $0 < '0') all) generate flatten($1);");
        pig.store("A", Util.generateURI(out.getAbsolutePath()));
        CBZip2InputStream cis = new CBZip2InputStream(
                new LocalSeekableInputStream(new File(out, "part-00000.bz")));
        assertEquals(-1, cis.read(new byte[100]));
        cis.close();
        pig.registerQuery("B=load '" + Util.generateURI(out.getAbsolutePath()) + "';");
        pig.openIterator("B");
        in.delete();
        out.delete();
    }

    /**
     * Tests the writing and reading of an empty BZip file.
     */
    @Test
    public void testEmptyBzip() throws Exception {
        File tmp = File.createTempFile("junit", ".tmp");
        tmp.deleteOnExit();
        CBZip2OutputStream cos = new CBZip2OutputStream(new FileOutputStream(
                tmp));
        cos.close();
        assertNotSame(0, tmp.length());
        CBZip2InputStream cis = new CBZip2InputStream(
                new LocalSeekableInputStream(tmp));
        assertEquals(-1, cis.read(new byte[100]));
        cis.close();
        tmp.delete();

    }
}