Package org.apache.hadoop.hive.ql.udf.generic

Source Code of org.apache.hadoop.hive.ql.udf.generic.TestGenericUDFLTrim

/**
* 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.ql.udf.generic;

import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDF;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDF.DeferredJavaObject;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDF.DeferredObject;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDFLTrim;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.apache.hadoop.io.Text;

import junit.framework.TestCase;

public class TestGenericUDFLTrim extends TestCase {

  public void testTrim() throws HiveException {
    GenericUDFLTrim udf = new GenericUDFLTrim();
    ObjectInspector valueOI = PrimitiveObjectInspectorFactory.writableStringObjectInspector;
    ObjectInspector[] arguments = { valueOI };

    udf.initialize(arguments);
    runAndVerify(" Hello World! ", "Hello World! ", udf);
    runAndVerify("Hello World! ", "Hello World! ", udf);
    runAndVerify(" Hello World!", "Hello World!", udf);
    runAndVerify("Hello World!", "Hello World!", udf);
    runAndVerify("   ", "", udf);
  }

  private void runAndVerify(String str, String expResult, GenericUDF udf) throws HiveException {

    DeferredObject valueObj = new DeferredJavaObject(new Text(str));
    DeferredObject[] args = { valueObj };
    Text output = (Text) udf.evaluate(args);
    assertEquals("ltrim() test ", expResult, output.toString());
  }
}
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