compare.java

apache的log4j源码

/*
 * 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.log4j.util;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

public class Compare {

  static final int B1_NULL = -1;
  static final int B2_NULL = -2;
  
  static 
  public
  boolean compare(String file1, String file2) throws FileNotFoundException, 
                                                            IOException {
    BufferedReader in1 = new BufferedReader(new FileReader(file1));
    BufferedReader in2 = new BufferedReader(new FileReader(file2));
    
    String s1;
    int lineCounter = 0;
    while((s1 = in1.readLine()) != null) {
      lineCounter++;
      String s2 = in2.readLine();
      if(!s1.equals(s2)) {
	System.out.println("Files ["+file1+"] and ["+file2+"] differ on line " 
			   +lineCounter);
	System.out.println("One reads:  ["+s1+"].");
	System.out.println("Other reads:["+s2+"].");
	return false;
      }
    }
    
    // the second file is longer
    if(in2.read() != -1) {
      System.out.println("File ["+file2+"] longer than file ["+file1+"].");
      return false;
    }
    
    return true;
  }
  
}