/*
    * 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;
  
  import static org.junit.Assert.assertEquals;
  import static org.supercsv.SuperCsvTestUtils.ANONYMOUS_CSVCONTEXT;
  
  import java.util.regex.PatternSyntaxException;
  
  import org.junit.Before;
  import org.junit.Test;
  import org.supercsv.cellprocessor.ift.CellProcessor;
  import org.supercsv.exception.SuperCsvCellProcessorException;
  import org.supercsv.mock.IdentityTransform;
  
  /**
   * Tests the StrReplace processor.
   * 
   * @author Kasper B. Graversen
   * @author James Bassett
   */
  public class StrReplaceTest {
  	
  	private static final String REGEX = "\\s+"; // whitespace
  	private static final String REPLACEMENT = "_";
  	
  	private CellProcessor processor;
  	private CellProcessor processorChain;
  	
  	/**
  	 * Sets up the processors for the test using all constructor combinations.
  	 */
  	@Before
  	public void setUp() {
  		processor = new StrReplace(REGEX, REPLACEMENT);
  		processorChain = new StrReplace(REGEX, REPLACEMENT, new IdentityTransform());
  	}
  	
  	/**
  	 * Tests unchained/chained execution with valid input.
  	 */
  	@Test
  	public void testValidInput() {
  		String input = "This is a \tString with some \n whitespace";
  		String expected = "This_is_a_String_with_some_whitespace";
  		assertEquals(expected, processor.execute(input, ANONYMOUS_CSVCONTEXT));
  		assertEquals(expected, processorChain.execute(input, ANONYMOUS_CSVCONTEXT));
  	}
  	
  	/**
  	 * Tests unchained/chained execution with non-String input (toString() is called first).
  	 */
  	@Test
  	public void testNonStringInput() {
  		StringBuilder input = new StringBuilder("This is a \tString with some \n whitespace"); // how lazy!
  		String expected = "This_is_a_String_with_some_whitespace";
  		assertEquals(expected, processor.execute(input, ANONYMOUS_CSVCONTEXT));
  		assertEquals(expected, processorChain.execute(input, ANONYMOUS_CSVCONTEXT));
  	}
  	
  	/**
  	 * Tests execution with a null regex (should throw an Exception).
  	 */
  	@Test(expected = NullPointerException.class)
  	public void testWithNullRegex() {
  		processor = new StrReplace(null, REPLACEMENT);
  	}
  	
  	/**
  	 * Tests execution with a null replacement (should throw an Exception).
  	 */
  	@Test(expected = NullPointerException.class)
  	public void testWithNullReplacement() {
  		processor = new StrReplace(REGEX, null);
  	}
  	
  	/**
  	 * Tests execution with an empty regex (should throw an Exception).
  	 */
  	@Test(expected = IllegalArgumentException.class)
  	public void testWithEmptyRegex() {
  		processor = new StrReplace("", REPLACEMENT);
  	}
  	
  	/**
  	 * Tests execution with a null input (should throw an Exception).
 	 */
 	@Test(expected = PatternSyntaxException.class)
 	public void testWithInvalidRegex() {
 		processor = new StrReplace("***", REPLACEMENT);
 	}
 	
 	/**
 	 * Tests execution with a null input (should throw an Exception).
 	 */
 	@Test(expected = SuperCsvCellProcessorException.class)
 	public void testWithNull() {
 		processor.execute(null, ANONYMOUS_CSVCONTEXT);
 	}
 	
 }