/**
 * 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.hive.conf;

import junit.framework.TestCase;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.conf.HiveConf.ConfVars;


/**
 * TestHiveConf
 *
 * Test cases for HiveConf. Loads configuration files located
 * in common/src/test/resources.
 */
public class TestHiveConf extends TestCase {

  public void testHiveSitePath() throws Exception {
    String expectedPath = System.getProperty("test.build.resources") + "/hive-site.xml";
    assertEquals(expectedPath, new HiveConf().getHiveSitePath());
  }

  private void checkHadoopConf(String name, String expectedHadoopVal) throws Exception {
    assertEquals(expectedHadoopVal, new Configuration().get(name));
  }

  private void checkConfVar(ConfVars var, String expectedConfVarVal) throws Exception {
    assertEquals(expectedConfVarVal, var.defaultVal);
  }

  private void checkHiveConf(String name, String expectedHiveVal) throws Exception {
    assertEquals(expectedHiveVal, new HiveConf().get(name));
  }

  public void testConfProperties() throws Exception {
    // Make sure null-valued ConfVar properties do not override the Hadoop Configuration
    checkHadoopConf(ConfVars.HADOOPFS.varname, "core-site.xml");
    checkConfVar(ConfVars.HADOOPFS, null);
    checkHiveConf(ConfVars.HADOOPFS.varname, "core-site.xml");

    // Make sure non-null-valued ConfVar properties *do* override the Hadoop Configuration
    checkHadoopConf(ConfVars.HADOOPNUMREDUCERS.varname, "1");
    checkConfVar(ConfVars.HADOOPNUMREDUCERS, "-1");
    checkHiveConf(ConfVars.HADOOPNUMREDUCERS.varname, "-1");

    // Non-null ConfVar only defined in ConfVars
    checkHadoopConf(ConfVars.HIVESKEWJOINKEY.varname, null);
    checkConfVar(ConfVars.HIVESKEWJOINKEY, "100000");
    checkHiveConf(ConfVars.HIVESKEWJOINKEY.varname, "100000");

    // ConfVar overridden in in hive-site.xml
    checkHadoopConf(ConfVars.METASTORE_CONNECTION_DRIVER.varname, null);
    checkConfVar(ConfVars.METASTORE_CONNECTION_DRIVER, "org.apache.derby.jdbc.EmbeddedDriver");
    checkHiveConf(ConfVars.METASTORE_CONNECTION_DRIVER.varname, "hive-site.xml");

    // Property defined in hive-site.xml only
    checkHadoopConf("test.property1", null);
    checkHiveConf("test.property1", "hive-site.xml");

    // Test HiveConf property variable substitution in hive-site.xml
    checkHiveConf("test.var.hiveconf.property", ConfVars.DEFAULTPARTITIONNAME.defaultVal);
  }
}