Android Open Source - FolderCompare Diff View

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
===========================================================================
/*from  w  w w. jav  a  2 s.  c om*/
FolderCompare Source Code
Copyright (C) 2012 Andrey Budnik. 

This file is part of the FolderCompare Source Code.  

FolderCompare Source Code is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

FolderCompare Source Code is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with FolderCompare Source Code.  If not, see <http://www.gnu.org/licenses/>.

===========================================================================
*/

package fc.app;

import java.io.File;
import java.util.LinkedList;

import diff.diff_match_patch;
import diff.diff_match_patch.Diff;
import fc.dialogs.FolderChooser;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.text.Html;
import android.view.Menu;
import android.view.MenuItem;
import android.view.Window;
import android.widget.TextView;
import android.widget.Toast;

public class DiffView extends Activity
{
  private static final int MENU_SAVE_REPORT  = 1;
  
  private static final int RESULT_CHOOSER    = 12;
  
  private String leftPath, rightPath;
  private diff_match_patch comparator;
  private LinkedList< Diff > diffs;
  
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        getWindow().requestFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.diff);
        
        comparator = new diff_match_patch();
        
        Intent i = getIntent();
        leftPath = i.getExtras().getString( "left_path" );
        rightPath = i.getExtras().getString( "right_path" );
        
        CompareFiles();
    }
    
  private TextView GetListView()
  {
    return (TextView)findViewById( R.id.diff_text );
  }
  
  private String DiffToHTML( LinkedList< Diff > diffs )
  {
    String html = "";
    String s;
    
    for( Diff d : diffs )
    {
      s = d.text;
      String lines[] = s.split( "\n" );
      s = "";
      for( String line : lines )
      {
        s += "<![CDATA[" + line + "]]>&para;<br>";
      }
      
      switch( d.operation )
      {
        case EQUAL:
          html += s;
          break;
        
        case INSERT:
          html += "<br><b>&gt;&gt;&gt;</b><font color=\"#0bff0b\">";
          html += s;
          html += "</font>";
          break;
        
        case DELETE:
          html += "<br><b>&lt;&lt;&lt;</b><font color=\"#ff0b0b\">";
          html += s;
          html += "</font>";
          break;
      }
    }
    
    return html;
  }
  
  private void CompareFiles()
  {
    if ( new File( leftPath ).canRead() == false )
    {
      Toast.makeText( this, "Can't read file: " + leftPath, Toast.LENGTH_SHORT ).show();
      return;
    }
    
    if ( new File( rightPath ).canRead() == false )
    {
      Toast.makeText( this, "Can't read file: " + rightPath, Toast.LENGTH_SHORT ).show();
      return;
    }
    
    String text1 = Utils.ReadFileAsString( leftPath );
    String text2 = Utils.ReadFileAsString( rightPath );
    
    diffs = comparator.diff_main( text1, text2, true );
    
    comparator.diff_cleanupSemantic( diffs );
    
    String diffHtml = DiffToHTML( diffs );
    
    GetListView().setText( Html.fromHtml( diffHtml ) );
  }
  
  private void SaveReport( String reportPath )
  {
    String diffHtml = comparator.diff_prettyHtml( diffs );
    String out = "";
    
    out += "<html><head><title>File Comparison Report</title></head>";
    out += "<body><h1><strong>File Comparison Report</strong></h1>";
    out += "<p>Produced by <strong>Folder Compare</strong>.</p>";
    out += "<p>Compared \"" + leftPath + "\" and \"" + rightPath + "\".</p>";
    
    out += diffHtml;
    
    out += "</body></html>";
    
    Utils.WriteStringToFile( out, reportPath );
  }
  
  private void OnMenuSaveReport()
  {
    Intent intent = new Intent( DiffView.this, FolderChooser.class );
    intent.putExtra("default_name", "FileComparisonReport.html" );
    startActivityForResult( intent, RESULT_CHOOSER );
  }
  
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data)
    {
      super.onActivityResult(requestCode, resultCode, data);
      
      if ( resultCode == RESULT_CANCELED )
      {
        if ( requestCode == RESULT_CHOOSER )
        {
          String filePath = data.getStringExtra("path");
          if ( filePath.length() > 0 )
          {
            SaveReport( filePath );
          }
        }
      }
    }
  
    @Override
    public boolean onPrepareOptionsMenu(Menu menu)
    {
      MenuItem item;
      
      menu.clear();
      
      item = menu.add( 0, MENU_SAVE_REPORT, 0, "Save Report" );
      item.setIcon( R.drawable.save );
      
      return super.onPrepareOptionsMenu( menu );
    }
    
    @Override
    public boolean onOptionsItemSelected(MenuItem item)
    {
      switch( item.getItemId() )
      {
      case MENU_SAVE_REPORT:
        OnMenuSaveReport();
        return true;
      }
      return super.onOptionsItemSelected( item );
    }
}

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