/*
    * 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.supercsv.SuperCsvTestUtils.ANONYMOUS_CSVCONTEXT;
  
  import org.junit.Before;
  import org.junit.Test;
  import org.supercsv.SuperCsvTestUtils;
  import org.supercsv.cellprocessor.ift.CellProcessor;
  import org.supercsv.exception.SuperCsvCellProcessorException;
  import org.supercsv.exception.SuperCsvConstraintViolationException;
  import org.supercsv.mock.IdentityTransform;
  
  /**
   * Tests the Strlen constraint.
   * 
   * @author Kasper B. Graversen
   * @author James Bassett
   */
  public class StrlenTest {
  	
  	private static final int LENGTH1 = 2;
  	private static final int LENGTH2 = 3;
  	
  	private CellProcessor processor;
  	private CellProcessor processorChain;
  	private CellProcessor processorChain2;
  	
  	/**
  	 * Sets up the processors for the test using all constructor combinations.
  	 */
  	@Before
  	public void setUp() {
  		processor = new Strlen(LENGTH1, LENGTH2);
  		processorChain = new Strlen(LENGTH1, new IdentityTransform()); // only allows 1 length
  		processorChain2 = new Strlen(new int[] { LENGTH1, LENGTH2 }, new IdentityTransform());
  	}
  	
  	/**
  	 * Tests unchained/chained execution with inputs of valid lengths.
  	 */
  	@Test
  	public void testValidInput() {
  		String input = "OK";
  		assertEquals(input, processor.execute(input, ANONYMOUS_CSVCONTEXT));
  		assertEquals(input, processorChain.execute(input, ANONYMOUS_CSVCONTEXT));
  		assertEquals(input, processorChain2.execute(input, ANONYMOUS_CSVCONTEXT));
  		
  		input = "yep";
  		assertEquals(input, processor.execute(input, ANONYMOUS_CSVCONTEXT));
  		// skip 'processorChain' as it only has 1 valid length
  		assertEquals(input, processorChain2.execute(input, ANONYMOUS_CSVCONTEXT));
  		
  	}
  	
  	/**
  	 * Tests execution with an input with an unexpected length (should throw an Exception).
  	 */
  	@Test(expected = SuperCsvConstraintViolationException.class)
  	public void testInvalidInput() {
  		processor.execute("four", SuperCsvTestUtils.ANONYMOUS_CSVCONTEXT);
  	}
  	
  	/**
  	 * Tests construction of the processor with a negative length (should throw an Exception).
  	 */
  	@Test(expected = IllegalArgumentException.class)
  	public void testNegativeLength() {
  		new Strlen(-1);
  	}
  	
  	/**
  	 * Tests execution with a null input (should throw an Exception).
  	 */
  	@Test(expected = SuperCsvCellProcessorException.class)
  	public void testWithNull() {
  		processor.execute(null, ANONYMOUS_CSVCONTEXT);
  	}
  	
  	/**
  	 * Tests construction with a null array (should throw an Exception).
  	 */
  	@Test(expected = NullPointerException.class)
  	public void testConstructionWithNullArray() {
 		new Strlen((int[]) null);
 	}
 	
 	/**
 	 * Tests construction with an empty array (should throw an Exception).
 	 */
 	@Test(expected = IllegalArgumentException.class)
 	public void testConstructionWithEmptyArray() {
 		new Strlen(new int[] {});
 	}
 }