hadoop-tools/hadoop-distcp/src/test/java/org/apache/hadoop/tools/TestRegexCopyFilter.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.hadoop.tools;

import org.apache.hadoop.fs.Path;
import org.junit.Assert;
import org.junit.Test;

import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;

public class TestRegexCopyFilter {

  @Test
  public void testShouldCopyTrue() {
    List<Pattern> filters = new ArrayList<>();
    filters.add(Pattern.compile("user"));

    RegexCopyFilter regexCopyFilter = new RegexCopyFilter("fakeFile");
    regexCopyFilter.setFilters(filters);

    Path shouldCopyPath = new Path("/user/bar");
    Assert.assertTrue(regexCopyFilter.shouldCopy(shouldCopyPath));
  }

  @Test
  public void testShouldCopyFalse() {
    List<Pattern> filters = new ArrayList<>();
    filters.add(Pattern.compile(".*test.*"));

    RegexCopyFilter regexCopyFilter = new RegexCopyFilter("fakeFile");
    regexCopyFilter.setFilters(filters);

    Path shouldNotCopyPath = new Path("/user/testing");
    Assert.assertFalse(regexCopyFilter.shouldCopy(shouldNotCopyPath));
  }

  @Test
  public void testShouldCopyWithMultipleFilters() {
    List<Pattern> filters = new ArrayList<>();
    filters.add(Pattern.compile(".*test.*"));
    filters.add(Pattern.compile("/user/b.*"));
    filters.add(Pattern.compile(".*_SUCCESS"));

    List<Path> toCopy = getTestPaths();

    int shouldCopyCount = 0;

    RegexCopyFilter regexCopyFilter = new RegexCopyFilter("fakeFile");
    regexCopyFilter.setFilters(filters);

    for (Path path: toCopy) {
      if (regexCopyFilter.shouldCopy(path)) {
        shouldCopyCount++;
      }
    }

    Assert.assertEquals(2, shouldCopyCount);
  }

  @Test
  public void testShouldExcludeAll() {
    List<Pattern> filters = new ArrayList<>();
    filters.add(Pattern.compile(".*test.*"));
    filters.add(Pattern.compile("/user/b.*"));
    filters.add(Pattern.compile(".*"));           // exclude everything

    List<Path> toCopy = getTestPaths();

    int shouldCopyCount = 0;

    RegexCopyFilter regexCopyFilter = new RegexCopyFilter("fakeFile");
    regexCopyFilter.setFilters(filters);

    for (Path path: toCopy) {
      if (regexCopyFilter.shouldCopy(path)) {
        shouldCopyCount++;
      }
    }

    Assert.assertEquals(0, shouldCopyCount);
  }

  private List<Path> getTestPaths() {
    List<Path> toCopy = new ArrayList<>();
    toCopy.add(new Path("/user/bar"));
    toCopy.add(new Path("/user/foo/_SUCCESS"));
    toCopy.add(new Path("/hive/test_data"));
    toCopy.add(new Path("test"));
    toCopy.add(new Path("/user/foo/bar"));
    toCopy.add(new Path("/mapred/.staging_job"));
    return toCopy;
  }

}