TestImportTsv.java

/**
 * Copyright 2010 The Apache Software Foundation
 *
 * 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.hbase.mapreduce;

import java.util.ArrayList;

import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.mapreduce.ImportTsv.TsvParser;
import org.apache.hadoop.hbase.mapreduce.ImportTsv.TsvParser.BadTsvLineException;
import org.apache.hadoop.hbase.mapreduce.ImportTsv.TsvParser.ParsedLine;
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.Test;

import com.google.common.base.Joiner;
import com.google.common.base.Splitter;
import com.google.common.collect.Iterables;

import static org.junit.Assert.*;

public class TestImportTsv {
  @Test
  public void testTsvParserSpecParsing() {
    TsvParser parser;

    parser = new TsvParser("HBASE_ROW_KEY", "\t");
    assertNull(parser.getFamily(0));
    assertNull(parser.getQualifier(0));
    assertEquals(0, parser.getRowKeyColumnIndex());

    parser = new TsvParser("HBASE_ROW_KEY,col1:scol1", "\t");
    assertNull(parser.getFamily(0));
    assertNull(parser.getQualifier(0));
    assertBytesEquals(Bytes.toBytes("col1"), parser.getFamily(1));
    assertBytesEquals(Bytes.toBytes("scol1"), parser.getQualifier(1));
    assertEquals(0, parser.getRowKeyColumnIndex());

    parser = new TsvParser("HBASE_ROW_KEY,col1:scol1,col1:scol2", "\t");
    assertNull(parser.getFamily(0));
    assertNull(parser.getQualifier(0));
    assertBytesEquals(Bytes.toBytes("col1"), parser.getFamily(1));
    assertBytesEquals(Bytes.toBytes("scol1"), parser.getQualifier(1));
    assertBytesEquals(Bytes.toBytes("col1"), parser.getFamily(2));
    assertBytesEquals(Bytes.toBytes("scol2"), parser.getQualifier(2));
    assertEquals(0, parser.getRowKeyColumnIndex());
  }

  @Test
  public void testTsvParser() throws BadTsvLineException {
    TsvParser parser = new TsvParser("col_a,col_b:qual,HBASE_ROW_KEY,col_d", "\t");
    assertBytesEquals(Bytes.toBytes("col_a"), parser.getFamily(0));
    assertBytesEquals(HConstants.EMPTY_BYTE_ARRAY, parser.getQualifier(0));
    assertBytesEquals(Bytes.toBytes("col_b"), parser.getFamily(1));
    assertBytesEquals(Bytes.toBytes("qual"), parser.getQualifier(1));
    assertNull(parser.getFamily(2));
    assertNull(parser.getQualifier(2));
    assertEquals(2, parser.getRowKeyColumnIndex());
    
    byte[] line = Bytes.toBytes("val_a\tval_b\tval_c\tval_d");
    ParsedLine parsed = parser.parse(line, line.length);
    checkParsing(parsed, Splitter.on("\t").split(Bytes.toString(line)));
  }

  private void checkParsing(ParsedLine parsed, Iterable<String> expected) {
    ArrayList<String> parsedCols = new ArrayList<String>();
    for (int i = 0; i < parsed.getColumnCount(); i++) {
      parsedCols.add(Bytes.toString(
          parsed.getLineBytes(),
          parsed.getColumnOffset(i),
          parsed.getColumnLength(i)));
    }
    if (!Iterables.elementsEqual(parsedCols, expected)) {
      fail("Expected: " + Joiner.on(",").join(expected) + "\n" + 
          "Got:" + Joiner.on(",").join(parsedCols));
    }
  }
  
  private void assertBytesEquals(byte[] a, byte[] b) {
    assertEquals(Bytes.toStringBinary(a), Bytes.toStringBinary(b));
  }

  /**
   * Test cases that throw BadTsvLineException
   */
  @Test(expected=BadTsvLineException.class)
  public void testTsvParserBadTsvLineExcessiveColumns() throws BadTsvLineException {
    TsvParser parser = new TsvParser("HBASE_ROW_KEY,col_a", "\t");
    byte[] line = Bytes.toBytes("val_a\tval_b\tval_c");
    ParsedLine parsed = parser.parse(line, line.length);
  }

  @Test(expected=BadTsvLineException.class)
  public void testTsvParserBadTsvLineZeroColumn() throws BadTsvLineException {
    TsvParser parser = new TsvParser("HBASE_ROW_KEY,col_a", "\t");
    byte[] line = Bytes.toBytes("");
    ParsedLine parsed = parser.parse(line, line.length);
  }

  @Test(expected=BadTsvLineException.class)
  public void testTsvParserBadTsvLineOnlyKey() throws BadTsvLineException {
    TsvParser parser = new TsvParser("HBASE_ROW_KEY,col_a", "\t");
    byte[] line = Bytes.toBytes("key_only");
    ParsedLine parsed = parser.parse(line, line.length);
  }

  @Test(expected=BadTsvLineException.class)
  public void testTsvParserBadTsvLineNoRowKey() throws BadTsvLineException {
    TsvParser parser = new TsvParser("col_a,HBASE_ROW_KEY", "\t");
    byte[] line = Bytes.toBytes("only_cola_data_and_no_row_key");
    ParsedLine parsed = parser.parse(line, line.length);
  }
}