exec/java-exec/src/test/java/org/apache/drill/exec/physical/impl/scan/v3/file/TestFileDescrip.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.drill.exec.physical.impl.scan.v3.file;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import org.apache.drill.categories.EvfTests;
import org.apache.drill.test.BaseTest;
import org.apache.hadoop.fs.Path;
import org.junit.Test;
import org.junit.experimental.categories.Category;

@Category(EvfTests.class)
public class TestFileDescrip extends BaseTest {

  /**
   * Degenerate case: no file or root
   */
  @Test
  public void testEmpty() {
    FileDescrip fd = new FileDescrip(null, null);
    assertFalse(fd.isSet());
    assertNull(fd.filePath());
    assertEquals(0, fd.dirPathLength());
    assertNull(fd.partition(0));
  }

  /**
   * Degenerate case: no file path, but with as selection root
   * Should never occur in practice.
   */
  @Test
  public void testNoPath() {
    Path root = new Path("hdfs://a/b");
    FileDescrip fd = new FileDescrip(null, root);
    assertFalse(fd.isSet());
    assertNull(fd.filePath());
    assertEquals(0, fd.dirPathLength());
    assertNull(fd.partition(0));
  }

  /**
   * Simple file, no selection root.
   * Should never really occur, but let's test it anyway.
   */
  @Test
  public void testNoRoot() {
    Path input = new Path("hdfs://foo.csv");
    FileDescrip fd = new FileDescrip(input, null);
    assertTrue(fd.isSet());
    assertSame(input, fd.filePath());
    assertEquals(0, fd.dirPathLength());
    assertNull(fd.partition(0));
  }

  /**
   * Normal file, no selection root.
   */
  @Test
  public void testSingleFile() {
    Path input = new Path("hdfs://a/b/c/foo.csv");
    FileDescrip fd = new FileDescrip(input, null);
    assertTrue(fd.isSet());
    assertSame(input, fd.filePath());
    assertEquals(0, fd.dirPathLength());
    assertNull(fd.partition(0));
  }

  /**
   * Normal file, resides in selection root.
   */
  @Test
  public void testRootFile() {
    Path root = new Path("hdfs://a/b");
    Path input = new Path("hdfs://a/b/foo.csv");
    FileDescrip fd = new FileDescrip(input, root);
    assertTrue(fd.isSet());
    assertSame(input, fd.filePath());
    assertEquals(0, fd.dirPathLength());
    assertNull(fd.partition(0));
  }

  /**
   * Normal file, below selection root.
   */
  @Test
  public void testBelowRoot() {
    Path root = new Path("hdfs://a/b");
    Path input = new Path("hdfs://a/b/c/foo.csv");
    FileDescrip fd = new FileDescrip(input, root);
    assertTrue(fd.isSet());
    assertSame(input, fd.filePath());
    assertEquals(1, fd.dirPathLength());
    assertEquals("c", fd.partition(0));
    assertNull(fd.partition(1));
  }

  /**
   * Normal file, above selection root.
   * This is an error condition.
   */
  @Test
  public void testAboveRoot() {
    Path root = new Path("hdfs://a/b");
    Path input = new Path("hdfs://a/foo.csv");
    try {
      new FileDescrip(input, root);
      fail();
    } catch (IllegalArgumentException e) {
      // Expected
    }
  }

  /**
   * Normal file, disjoint with selection root.
   * This is an error condition.
   */
  @Test
  public void testDisjointPath() {
    Path root = new Path("hdfs://a/b");
    Path input = new Path("hdfs://d/foo.csv");
    try {
      new FileDescrip(input, root);
      fail();
    } catch (IllegalArgumentException e) {
      // Expected
    }
  }
}