Package org.eclipse.jgit.api

Source Code of org.eclipse.jgit.api.AddCommand

/*
* Copyright (C) 2010, Christian Halstrick <christian.halstrick@sap.com>
* Copyright (C) 2010, Stefan Lay <stefan.lay@sap.com>
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
*   notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
*   copyright notice, this list of conditions and the following
*   disclaimer in the documentation and/or other materials provided
*   with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
*   names of its contributors may be used to endorse or promote
*   products derived from this software without specific prior
*   written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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package org.eclipse.jgit.api;

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

import org.eclipse.jgit.JGitText;
import org.eclipse.jgit.dircache.DirCache;
import org.eclipse.jgit.dircache.DirCacheBuildIterator;
import org.eclipse.jgit.dircache.DirCacheBuilder;
import org.eclipse.jgit.dircache.DirCacheEntry;
import org.eclipse.jgit.dircache.DirCacheIterator;
import org.eclipse.jgit.lib.ObjectWriter;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.treewalk.FileTreeIterator;
import org.eclipse.jgit.treewalk.TreeWalk;
import org.eclipse.jgit.treewalk.WorkingTreeIterator;
import org.eclipse.jgit.treewalk.filter.PathFilterGroup;

/**
* A class used to execute a {@code Add} command. It has setters for all
* supported options and arguments of this command and a {@link #call()} method
* to finally execute the command. Each instance of this class should only be
* used for one invocation of the command (means: one call to {@link #call()})
*
* @see <a href="http://www.kernel.org/pub/software/scm/git/docs/git-add.html"
*      >Git documentation about Add</a>
*/
public class AddCommand extends GitCommand<DirCache> {

  private Collection<String> filepatterns;

  private WorkingTreeIterator workingTreeIterator;

  private boolean update = false;

  /**
   *
   * @param repo
   */
  public AddCommand(Repository repo) {
    super(repo);
    filepatterns = new LinkedList<String>();
  }

  /**
   * @param filepattern
   *            File to add content from. Also a leading directory name (e.g.
   *            dir to add dir/file1 and dir/file2) can be given to add all
   *            files in the directory, recursively. Fileglobs (e.g. *.c) are
   *            not yet supported.
   * @return {@code this}
   */
  public AddCommand addFilepattern(String filepattern) {
    checkCallable();
    filepatterns.add(filepattern);
    return this;
  }

  /**
   * Allow clients to provide their own implementation of a FileTreeIterator
   * @param f
   * @return {@code this}
   */
  public AddCommand setWorkingTreeIterator(WorkingTreeIterator f) {
    workingTreeIterator = f;
    return this;
  }

  /**
   * Executes the {@code Add} command. Each instance of this class should only
   * be used for one invocation of the command. Don't call this method twice
   * on an instance.
   *
   * @return the DirCache after Add
   */
  public DirCache call() throws NoFilepatternException {

    if (filepatterns.isEmpty())
      throw new NoFilepatternException(JGitText.get().atLeastOnePatternIsRequired);
    checkCallable();
    DirCache dc = null;
    boolean addAll = false;
    if (filepatterns.contains("."))
      addAll = true;

    try {
      dc = repo.lockDirCache();
      ObjectWriter ow = new ObjectWriter(repo);
      DirCacheIterator c;

      DirCacheBuilder builder = dc.builder();
      final TreeWalk tw = new TreeWalk(repo);
      tw.reset();
      tw.addTree(new DirCacheBuildIterator(builder));
      if (workingTreeIterator == null)
        workingTreeIterator = new FileTreeIterator(repo);
      tw.addTree(workingTreeIterator);
      tw.setRecursive(true);
      if (!addAll)
        tw.setFilter(PathFilterGroup.createFromStrings(filepatterns));

      String lastAddedFile = null;

      while (tw.next()) {
        String path = tw.getPathString();

        final File file = new File(repo.getWorkTree(), path);
        WorkingTreeIterator f = tw.getTree(1, WorkingTreeIterator.class);
        if (tw.getTree(0, DirCacheIterator.class) == null &&
            f != null && f.isEntryIgnored()) {
          // file is not in index but is ignored, do nothing
        }
        // In case of an existing merge conflict the
        // DirCacheBuildIterator iterates over all stages of
        // this path, we however want to add only one
        // new DirCacheEntry per path.
        else if (!(path.equals(lastAddedFile))) {
          if (!(update && tw.getTree(0, DirCacheIterator.class) == null)) {
            if (f != null) { // the file exists
              DirCacheEntry entry = new DirCacheEntry(path);
              entry.setLength((int)f.getEntryLength());
              entry.setLastModified(f.getEntryLastModified());
              entry.setFileMode(f.getEntryFileMode());
              entry.setObjectId(ow.writeBlob(file));

              builder.add(entry);
              lastAddedFile = path;
            } else if (!update){
              c = tw.getTree(0, DirCacheIterator.class);
              builder.add(c.getDirCacheEntry());
            }
          }
        }
      }
      builder.commit();
      setCallable(false);
    } catch (IOException e) {
      throw new JGitInternalException(
          JGitText.get().exceptionCaughtDuringExecutionOfAddCommand, e);
    } finally {
      if (dc != null)
        dc.unlock();
    }

    return dc;
  }

  /**
   * @param update
   *            If set to true, the command only matches {@code filepattern}
   *            against already tracked files in the index rather than the
   *            working tree. That means that it will never stage new files,
   *            but that it will stage modified new contents of tracked files
   *            and that it will remove files from the index if the
   *            corresponding files in the working tree have been removed.
   *            In contrast to the git command line a {@code filepattern} must
   *            exist also if update is set to true as there is no
   *            concept of a working directory here.
   *
   * @return {@code this}
   */
  public AddCommand setUpdate(boolean update) {
    this.update = update;
    return this;
  }

  /**
   * @return is the parameter update is set
   */
  public boolean isUpdate() {
    return update;
  }
}
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