/*
    * Copyright 2006-2007 the original author or authors.
    *
    * 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.springframework.batch.test;
  
  import java.io.BufferedReader;
  import java.io.File;
  import java.io.FileReader;
  
  import junit.framework.Assert;
  
  import org.springframework.core.io.Resource;
  
  /**
   * This class can be used to assert that two files are the same.
   * 
   * @author Dan Garrette
   * @since 2.0
   */
  public abstract class AssertFile {
  
  	public static void assertFileEquals(File expected, File actual) throws Exception {
  		BufferedReader expectedReader = new BufferedReader(new FileReader(expected));
  		BufferedReader actualReader = new BufferedReader(new FileReader(actual));
  		try {
  			int lineNum = 1;
  			for (String expectedLine = null; (expectedLine = expectedReader.readLine()) != null; lineNum++) {
  				String actualLine = actualReader.readLine();
  				Assert.assertEquals("Line number " + lineNum + " does not match.", expectedLine, actualLine);
  			}
  
  			String actualLine = actualReader.readLine();
  			Assert.assertEquals("More lines than expected.  There should not be a line number " + lineNum + ".", null,
  					actualLine);
  		}
  		finally {
  			expectedReader.close();
  			actualReader.close();
  		}
  	}
  
  	public static void assertFileEquals(Resource expected, Resource actual) throws Exception {
  		AssertFile.assertFileEquals(expected.getFile(), actual.getFile());
  	}
  
  	public static void assertLineCount(int expectedLineCount, File file) throws Exception {
  		BufferedReader expectedReader = new BufferedReader(new FileReader(file));
  		try {
  			int lineCount = 0;
  			while (expectedReader.readLine() != null) {
  				lineCount++;
  			}
  			Assert.assertEquals(expectedLineCount, lineCount);
  		}
  		finally {
  			expectedReader.close();
  		}
  	}
  
  	public static void assertLineCount(int expectedLineCount, Resource resource) throws Exception {
  		AssertFile.assertLineCount(expectedLineCount, resource.getFile());
  	}
  }