contrib/views/hive-next/src/test/java/org/apache/ambari/view/hive2/resources/upload/XMLParserTest.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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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.ambari.view.hive2.resources.upload;

import org.apache.ambari.view.hive2.client.Row;
import org.apache.ambari.view.hive2.resources.uploads.parsers.xml.XMLParser;
import org.junit.Assert;
import org.junit.Test;

import java.io.IOException;
import java.io.StringReader;
import java.util.Iterator;

public class XMLParserTest {

  @Test(expected = IOException.class)
  public void testEmptyStream() throws Exception {
    String xml = "";

    try(
      StringReader sr = new StringReader(xml);
      XMLParser jp = new XMLParser(sr, null);
      ) {
        // creation of XMLParser will throw exception.
    }
  }

  @Test
  public void testEmptyRow() throws Exception {
    String xml = "<table><row></row></table>";
    try(
      StringReader sr = new StringReader(xml);
      XMLParser jp = new XMLParser(sr, null);
      ) {
      Iterator<Row> iterator = jp.iterator();

      Assert.assertEquals("Iterator should not be Empty", true, iterator.hasNext());
      Assert.assertArrayEquals("Row should be empty",new Object[]{},iterator.next().getRow());
    }
  }


  @Test
  public void testEmptyTable() throws Exception {
    String xml = "<table></table>";

    try(
      StringReader sr = new StringReader(xml);
      XMLParser jp = new XMLParser(sr, null);
      ) {
      Iterator<Row> iterator = jp.iterator();

      Assert.assertEquals("Iterator Empty!", false, iterator.hasNext());
    }
  }

  @Test
  public void testParse1Row() throws Exception {

    String xml =
    "<table>"
    + "<row>"
    + "<col name=\"key1\">value1</col>"
    + "<col name=\"key2\">c</col>"
    + "<col name=\"key3\">10</col>"
    + "<col name=\"key4\">10.1</col>"
    + "</row>"
    + "</table>"  ;

    try(
      StringReader sr = new StringReader(xml);
      XMLParser jp = new XMLParser(sr, null)
    ) {
      Iterator<Row> iterator = jp.iterator();

      Assert.assertEquals("Iterator Empty!", true, iterator.hasNext());
      Row row = iterator.next();
      Row expected = new Row(new Object[]{"value1", "c", "10", "10.1"});
      Assert.assertEquals("Row not equal!", expected, row);

      Assert.assertEquals("Should report no more rows!", false, iterator.hasNext());
    }
  }

  @Test
  public void testParseMultipleRow() throws Exception {
    String xml =
    "<table>"
    + "<row>"
    + "<col name=\"key1\">value1</col>"
    + "<col name=\"key2\">c</col>"
    + "<col name=\"key3\">10</col>"
    + "<col name=\"key4\">10.1</col>"
    + "</row>"
    + "<row>"
    + "<col name=\"key1\">value2</col>"
    + "<col name=\"key2\">c2</col>"
    + "<col name=\"key3\">102</col>"
    + "<col name=\"key4\">true</col>"
    + "</row>"
    + "</table>"  ;

    try(
      StringReader sr = new StringReader(xml);
      XMLParser jp = new XMLParser(sr, null)
    ) {
      Iterator<Row> iterator = jp.iterator();

      Assert.assertEquals("Failed to detect 1st row!", true, iterator.hasNext());
      Assert.assertEquals("Failed to match 1st row!", new Row(new Object[]{"value1", "c", "10", "10.1"}), iterator.next());

      Assert.assertEquals("Failed to detect 2nd row!", true, iterator.hasNext());
      Assert.assertEquals("Failed to match 2nd row!", new Row(new Object[]{"value2", "c2", "102", Boolean.TRUE.toString()}), iterator.next());

      Assert.assertEquals("Failed to detect end of rows!", false, iterator.hasNext());
      Assert.assertEquals("Failed to detect end of rows 2nd time!", false, iterator.hasNext());
    }
  }
}