org.apache.hadoop.fs.TestListFiles.java Source code

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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
 *
 *     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.hadoop.fs;

import java.io.IOException;
import java.util.HashSet;
import java.util.Random;
import java.util.Set;

import org.apache.commons.logging.impl.Log4JLogger;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.log4j.Level;

import static org.junit.Assert.*;
import org.junit.Test;
import org.junit.BeforeClass;

/**
 * This class tests the FileStatus API.
 */
public class TestListFiles {
    {
        ((Log4JLogger) FileSystem.LOG).getLogger().setLevel(Level.ALL);
    }

    static final long seed = 0xDEADBEEFL;

    final protected static Configuration conf = new Configuration();
    protected static FileSystem fs;
    protected static Path TEST_DIR;
    final private static int FILE_LEN = 10;
    private static Path FILE1;
    private static Path DIR1;
    private static Path FILE2;
    private static Path FILE3;

    static {
        setTestPaths(new Path(System.getProperty("test.build.data", "build/test/data/work-dir/localfs"), "main_"));
    }

    protected static Path getTestDir() {
        return TEST_DIR;
    }

    /**
     * Sets the root testing directory and reinitializes any additional test paths
     * that are under the root.  This method is intended to be called from a
     * subclass's @BeforeClass method if there is a need to override the testing
     * directory.
     * 
     * @param testDir Path root testing directory
     */
    protected static void setTestPaths(Path testDir) {
        TEST_DIR = testDir;
        FILE1 = new Path(TEST_DIR, "file1");
        DIR1 = new Path(TEST_DIR, "dir1");
        FILE2 = new Path(DIR1, "file2");
        FILE3 = new Path(DIR1, "file3");
    }

    @BeforeClass
    public static void testSetUp() throws Exception {
        fs = FileSystem.getLocal(conf);
        fs.delete(TEST_DIR, true);
    }

    private static void writeFile(FileSystem fileSys, Path name, int fileSize) throws IOException {
        // Create and write a file that contains three blocks of data
        FSDataOutputStream stm = fileSys.create(name);
        byte[] buffer = new byte[fileSize];
        Random rand = new Random(seed);
        rand.nextBytes(buffer);
        stm.write(buffer);
        stm.close();
    }

    /** Test when input path is a file */
    @Test
    public void testFile() throws IOException {
        fs.mkdirs(TEST_DIR);
        writeFile(fs, FILE1, FILE_LEN);

        RemoteIterator<LocatedFileStatus> itor = fs.listFiles(FILE1, true);
        LocatedFileStatus stat = itor.next();
        assertFalse(itor.hasNext());
        assertTrue(stat.isFile());
        assertEquals(FILE_LEN, stat.getLen());
        assertEquals(fs.makeQualified(FILE1), stat.getPath());
        assertEquals(1, stat.getBlockLocations().length);

        itor = fs.listFiles(FILE1, false);
        stat = itor.next();
        assertFalse(itor.hasNext());
        assertTrue(stat.isFile());
        assertEquals(FILE_LEN, stat.getLen());
        assertEquals(fs.makeQualified(FILE1), stat.getPath());
        assertEquals(1, stat.getBlockLocations().length);

        fs.delete(FILE1, true);
    }

    /** Test when input path is a directory */
    @Test
    public void testDirectory() throws IOException {
        fs.mkdirs(DIR1);

        // test empty directory
        RemoteIterator<LocatedFileStatus> itor = fs.listFiles(DIR1, true);
        assertFalse(itor.hasNext());
        itor = fs.listFiles(DIR1, false);
        assertFalse(itor.hasNext());

        // testing directory with 1 file
        writeFile(fs, FILE2, FILE_LEN);
        itor = fs.listFiles(DIR1, true);
        LocatedFileStatus stat = itor.next();
        assertFalse(itor.hasNext());
        assertTrue(stat.isFile());
        assertEquals(FILE_LEN, stat.getLen());
        assertEquals(fs.makeQualified(FILE2), stat.getPath());
        assertEquals(1, stat.getBlockLocations().length);

        itor = fs.listFiles(DIR1, false);
        stat = itor.next();
        assertFalse(itor.hasNext());
        assertTrue(stat.isFile());
        assertEquals(FILE_LEN, stat.getLen());
        assertEquals(fs.makeQualified(FILE2), stat.getPath());
        assertEquals(1, stat.getBlockLocations().length);

        // test more complicated directory
        writeFile(fs, FILE1, FILE_LEN);
        writeFile(fs, FILE3, FILE_LEN);

        Set<Path> filesToFind = new HashSet<Path>();
        filesToFind.add(fs.makeQualified(FILE1));
        filesToFind.add(fs.makeQualified(FILE2));
        filesToFind.add(fs.makeQualified(FILE3));

        itor = fs.listFiles(TEST_DIR, true);
        stat = itor.next();
        assertTrue(stat.isFile());
        assertTrue("Path " + stat.getPath() + " unexpected", filesToFind.remove(stat.getPath()));

        stat = itor.next();
        assertTrue(stat.isFile());
        assertTrue("Path " + stat.getPath() + " unexpected", filesToFind.remove(stat.getPath()));

        stat = itor.next();
        assertTrue(stat.isFile());
        assertTrue("Path " + stat.getPath() + " unexpected", filesToFind.remove(stat.getPath()));
        assertFalse(itor.hasNext());
        assertTrue(filesToFind.isEmpty());

        itor = fs.listFiles(TEST_DIR, false);
        stat = itor.next();
        assertTrue(stat.isFile());
        assertEquals(fs.makeQualified(FILE1), stat.getPath());
        assertFalse(itor.hasNext());

        fs.delete(TEST_DIR, true);
    }
}