Performing 'svn merge URL_TO_TRUNK BRANCH_WC' and handling conflicts with SVNKit

   1 /*
   2  * ====================================================================
   3  * Copyright (c) 2004-2008 TMate Software Ltd.  All rights reserved.
   4  *
   5  * This software is licensed as described in the file COPYING, which
   6  * you should have received as part of this distribution.  The terms
   7  * are also available at http://svnkit.com/license.html.
   8  * If newer versions of this license are posted there, you may use a
   9  * newer version instead, at your option.
  10  * ====================================================================
  11  */
  12 package org.tmatesoft.svn.examples.wc;
  13 
  14 import java.io.File;
  15 import java.io.IOException;
  16 import java.util.Collections;
  17 
  18 import org.tmatesoft.svn.core.SVNCommitInfo;
  19 import org.tmatesoft.svn.core.SVNDepth;
  20 import org.tmatesoft.svn.core.SVNException;
  21 import org.tmatesoft.svn.core.SVNPropertyValue;
  22 import org.tmatesoft.svn.core.SVNURL;
  23 import org.tmatesoft.svn.core.internal.wc.DefaultSVNOptions;
  24 import org.tmatesoft.svn.core.wc.ISVNConflictHandler;
  25 import org.tmatesoft.svn.core.wc.SVNClientManager;
  26 import org.tmatesoft.svn.core.wc.SVNCommitClient;
  27 import org.tmatesoft.svn.core.wc.SVNConflictChoice;
  28 import org.tmatesoft.svn.core.wc.SVNConflictDescription;
  29 import org.tmatesoft.svn.core.wc.SVNConflictReason;
  30 import org.tmatesoft.svn.core.wc.SVNConflictResult;
  31 import org.tmatesoft.svn.core.wc.SVNCopyClient;
  32 import org.tmatesoft.svn.core.wc.SVNCopySource;
  33 import org.tmatesoft.svn.core.wc.SVNDiffClient;
  34 import org.tmatesoft.svn.core.wc.SVNMergeFileSet;
  35 import org.tmatesoft.svn.core.wc.SVNRevision;
  36 import org.tmatesoft.svn.core.wc.SVNRevisionRange;
  37 import org.tmatesoft.svn.core.wc.SVNWCClient;
  38 
  39 
  40 /**
  41  * @version 1.2.0
  42  * @author  TMate Software Ltd.
  43  */
  44 public class ConflictedMerge {
  45     /**
  46      * Pass the absolute path of the base directory where all example data will be created in 
  47      * arg[0]. The sample will create:
  48      *  
  49      *  - arg[0]/exampleRepository - repository with some test data
  50      *  - arg[0]/exampleWC         - working copy checked out from exampleRepository
  51      */
  52     public static void main (String[] args) {
  53         //initialize SVNKit to work through file:/// protocol
  54         SamplesUtility.initializeFSFSprotocol();
  55         
  56         File baseDirectory = new File(args[0]);
  57         File reposRoot = new File(baseDirectory, "exampleRepository");
  58         File wcRoot = new File(baseDirectory, "exampleWC");
  59         
  60         try {
  61             //first create a repository and fill it with data
  62             SamplesUtility.createRepository(reposRoot);
  63             SVNCommitInfo info = SamplesUtility.createRepositoryTree(reposRoot);
  64             //print out new revision info
  65             System.out.println(info);
  66 
  67             SVNClientManager clientManager = SVNClientManager.newInstance();
  68             
  69             SVNURL reposURL = SVNURL.fromFile(reposRoot);
  70 
  71             //copy A to A_copy in repository (url-to-url copy)
  72             SVNCopyClient copyClient = clientManager.getCopyClient();
  73             SVNURL A_URL = reposURL.appendPath("A", true);
  74             SVNURL copyTargetURL = reposURL.appendPath("A_copy", true);
  75             SVNCopySource copySource = new SVNCopySource(SVNRevision.UNDEFINED, SVNRevision.HEAD, A_URL); 
  76             info = copyClient.doCopy(new SVNCopySource[] { copySource }, copyTargetURL, false, false, true, 
  77                     "copy A to A_copy", null);
  78             //print out new revision info
  79             System.out.println(info);
  80             
  81             //checkout the entire repository tree
  82             SamplesUtility.checkOutWorkingCopy(reposURL, wcRoot);
  83 
  84             
  85             //now make some changes to the A tree
  86             SamplesUtility.writeToFile(new File(wcRoot, "A/B/lambda"), "New text appended to 'lambda'", true);
  87             SamplesUtility.writeToFile(new File(wcRoot, "A/mu"), "New text in 'mu'", false);
  88             
  89             SVNWCClient wcClient = SVNClientManager.newInstance().getWCClient();
  90             wcClient.doSetProperty(new File(wcRoot, "A/B"), "spam", SVNPropertyValue.create("egg"), false, 
  91                     SVNDepth.EMPTY, null, null);
  92 
  93             //commit local changes
  94             SVNCommitClient commitClient = clientManager.getCommitClient();
  95             commitClient.doCommit(new File[] { wcRoot }, false, "committing changes", null, null, false, false, SVNDepth.INFINITY);
  96 
  97             //now make some local changes to the A_copy tree 
  98             //change file contents of A_copy/B/lambda and A_copy/mu
  99             SamplesUtility.writeToFile(new File(wcRoot, "A_copy/B/lambda"), "New text in copied 'lambda'", true);
 100             SamplesUtility.writeToFile(new File(wcRoot, "A_copy/mu"), "New text in copied 'mu'", false);
 101 
 102             //now diff the base revision of the working copy against the repository
 103             SVNDiffClient diffClient = clientManager.getDiffClient();
 104 
 105             /*
 106              * Since we provided no custom ISVNOptions implementation to SVNClientManager, our 
 107              * manager uses DefaultSVNOptions, which is set to all SVN*Client classes which the 
 108              * manager produces. So, we can cast ISVNOptions to DefaultSVNOptions.
 109              */
 110             DefaultSVNOptions options = (DefaultSVNOptions) diffClient.getOptions();
 111             //This way we set a conflict handler which will automatically resolve conflicts for those 
 112             //cases that we would like
 113             options.setConflictHandler(new ConflictResolverHandler());
 114             
 115             /* do the same merge call, merge-tracking feature will merge only those revisions
 116              * which were not still merged.
 117              */ 
 118             SVNRevisionRange rangeToMerge = new SVNRevisionRange(SVNRevision.create(1), SVNRevision.HEAD);
 119             diffClient.doMerge(A_URL, SVNRevision.HEAD, Collections.singleton(rangeToMerge), 
 120                     new File(wcRoot, "A_copy"), SVNDepth.UNKNOWN, true, false, false, false);
 121             
 122         } catch (SVNException svne) {
 123             System.out.println(svne.getErrorMessage());
 124             System.exit(1);
 125         } catch (IOException ioe) {
 126             ioe.printStackTrace();
 127             System.exit(1);
 128         }
 129     }
 130 
 131     /**
 132      * Conflict resolver which always selects the local version of a file.
 133      * 
 134      * @version 1.2.0
 135      * @author  TMate Software Ltd.
 136      */
 137     private static class ConflictResolverHandler implements ISVNConflictHandler {
 138     
 139         public SVNConflictResult handleConflict(SVNConflictDescription conflictDescription) throws SVNException {
 140             SVNConflictReason reason = conflictDescription.getConflictReason();
 141             SVNMergeFileSet mergeFiles = conflictDescription.getMergeFiles();
 142             
 143             SVNConflictChoice choice = SVNConflictChoice.THEIRS_FULL;
 144             if (reason == SVNConflictReason.EDITED) {
 145                 //If the reason why conflict occurred is local edits, chose local version of the file
 146                 //Otherwise the repository version of the file will be chosen.
 147                 choice = SVNConflictChoice.MINE_FULL;
 148             }
 149             System.out.println("Automatically resolving conflict for " + mergeFiles.getWCFile() + 
 150                     ", choosing " + (choice == SVNConflictChoice.MINE_FULL ? "local file" : "repository file"));
 151             return new SVNConflictResult(choice, mergeFiles.getResultFile()); 
 152         }   
 153     
 154     }
 155 }