1   /*   Copyright 2004 The Apache Software Foundation
    2   *
    3   *   Licensed under the Apache License, Version 2.0 (the "License");
    4   *   you may not use this file except in compliance with the License.
    5   *   You may obtain a copy of the License at
    6   *
    7   *       http://www.apache.org/licenses/LICENSE-2.0
    8   *
    9   *   Unless required by applicable law or agreed to in writing, software
   10   *   distributed under the License is distributed on an "AS IS" BASIS,
   11   *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   12   *   See the License for the specific language governing permissions and
   13   *  limitations under the License.
   14   */
   15   
   16   package org.apache.xmlbeans.impl.util;
   17   
   18   import java.io.IOException;
   19   import java.io.LineNumberReader;
   20   import java.io.Reader;
   21   import java.util.List;
   22   
   23   /**
   24    * This needs to be here so that it can be accessed by FilerImpl
   25    */
   26   public class Diff
   27   {
   28       public static void readersAsText(Reader r1, String name1, Reader r2, String name2,
   29           List diffs)
   30           throws IOException
   31       {
   32           LineNumberReader reader1 = new LineNumberReader(r1);
   33           LineNumberReader reader2 = new LineNumberReader(r2);
   34           String line1 = reader1.readLine();
   35           String line2 = reader2.readLine();
   36           while (line1 != null && line2 != null)
   37           {
   38               if (!line1.equals(line2))
   39               {
   40                   diffs.add("File \"" + name1 + "\" and file \"" +
   41                       name2 + "\" differ at line " + reader1.getLineNumber() +
   42                       ":" + "\n" + line1 + "\n========\n" + line2);
   43                   break;
   44               }
   45               line1 = reader1.readLine();
   46               line2 = reader2.readLine();
   47           }
   48           if (line1 == null && line2 != null)
   49               diffs.add("File \"" + name2 + "\" has extra lines at line " +
   50                   reader2.getLineNumber() + ":\n" + line2);
   51           if (line1 != null && line2 == null)
   52               diffs.add("File \"" + name1 + "\" has extra lines at line " +
   53                   reader1.getLineNumber() + ":\n" + line1);
   54       }
   55   }