/*
    * Copyright 2007 Kasper B. Graversen
    * 
    * Licensed 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.supercsv.cellprocessor.constraint;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNull;
  import static org.supercsv.SuperCsvTestUtils.ANONYMOUS_CSVCONTEXT;
  
  import org.junit.Before;
  import org.junit.Test;
  import org.supercsv.cellprocessor.ift.CellProcessor;
  import org.supercsv.exception.SuperCsvConstraintViolationException;
  import org.supercsv.mock.IdentityTransform;
  
  /**
   * Tests the Equals constraint.
   * 
   * @author James Bassett
   */
  public class EqualsTest {
  	
  	private static final String EXPECTED_VALUE = "expected";
  	
  	private CellProcessor processor;
  	private CellProcessor processor2;
  	private CellProcessor processorChain;
  	private CellProcessor processorChain2;
  	
  	/**
  	 * Sets up the processors for the test using all constructor combinations.
  	 */
  	@Before
  	public void setUp() {
  		processor = new Equals();
  		processor2 = new Equals(EXPECTED_VALUE);
  		processorChain = new Equals(new IdentityTransform());
  		processorChain2 = new Equals(EXPECTED_VALUE, new IdentityTransform());
  	}
  	
  	/**
  	 * Tests unchained/chained execution with valid (equal) input. The non-constant processors have their constant value
  	 * loaded after the first execution (no check is done on the first execution), so the subsequent call should check
  	 * against that value.
  	 */
  	@Test
  	public void testValidInput() {
  		assertEquals(EXPECTED_VALUE, processor.execute(EXPECTED_VALUE, ANONYMOUS_CSVCONTEXT));
  		assertEquals(EXPECTED_VALUE, processor2.execute(EXPECTED_VALUE, ANONYMOUS_CSVCONTEXT));
  		assertEquals(EXPECTED_VALUE, processorChain.execute(EXPECTED_VALUE, ANONYMOUS_CSVCONTEXT));
  		assertEquals(EXPECTED_VALUE, processorChain2.execute(EXPECTED_VALUE, ANONYMOUS_CSVCONTEXT));
  		
  		// repeat for the benefit of the 'non-constant' processors which will now check against the first value found
  		assertEquals(EXPECTED_VALUE, processor.execute(EXPECTED_VALUE, ANONYMOUS_CSVCONTEXT));
  		assertEquals(EXPECTED_VALUE, processorChain.execute(EXPECTED_VALUE, ANONYMOUS_CSVCONTEXT));
  		
  		// and check the 'constant' processors again, just for good measure
  		assertEquals(EXPECTED_VALUE, processor2.execute(EXPECTED_VALUE, ANONYMOUS_CSVCONTEXT));
  		assertEquals(EXPECTED_VALUE, processorChain2.execute(EXPECTED_VALUE, ANONYMOUS_CSVCONTEXT));
  	}
  	
  	/**
  	 * Tests execution with a null expected value and null input.
  	 */
  	@Test
  	public void testNullConstantWithNull() {
  		CellProcessor equalsWithNullConstant = new Equals((Object) null);
  		assertNull(equalsWithNullConstant.execute(null, ANONYMOUS_CSVCONTEXT));
  	}
  	
  	/**
  	 * Tests execution with a null expected value, but a non-null input (should throw an exception).
  	 */
  	@Test(expected = SuperCsvConstraintViolationException.class)
  	public void testNullConstantWithNonNull() {
  		CellProcessor equalsWithNullConstant = new Equals((Object) null);
  		equalsWithNullConstant.execute(EXPECTED_VALUE, ANONYMOUS_CSVCONTEXT);
  	}
  	
  	/**
  	 * Tests a value that's not equal to the first value encountered (should throw an exception).
  	 */
  	@Test(expected = SuperCsvConstraintViolationException.class)
  	public void testNotEqual() {
  		assertEquals(EXPECTED_VALUE, processor.execute(EXPECTED_VALUE, ANONYMOUS_CSVCONTEXT));
  		processor.execute("something else", ANONYMOUS_CSVCONTEXT);
  	}
 	
 	/**
 	 * Tests a value that's not equal to the constant value (should throw an exception).
 	 */
 	@Test(expected = SuperCsvConstraintViolationException.class)
 	public void testNotEqualWithConstant() {
 		processor2.execute("something else", ANONYMOUS_CSVCONTEXT);
 	}
 	
 }