AddNoteCommand.java

/*
 * Copyright (C) 2011, Chris Aniszczyk <caniszczyk@gmail.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
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package org.eclipse.jgit.api;

import java.io.IOException;

import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.api.errors.JGitInternalException;
import org.eclipse.jgit.lib.CommitBuilder;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectInserter;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.notes.Note;
import org.eclipse.jgit.notes.NoteMap;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevObject;
import org.eclipse.jgit.revwalk.RevWalk;

/**
 * Add object notes.
 *
 * @see <a href="http://www.kernel.org/pub/software/scm/git/docs/git-notes.html"
 *      >Git documentation about Notes</a>
 */
public class AddNoteCommand extends GitCommand<Note> {

    private RevObject id;

    private String message;

    private String notesRef = Constants.R_NOTES_COMMITS;

    /**
     * Constructor for AddNoteCommand
     *
     * @param repo
     *            the {@link org.eclipse.jgit.lib.Repository}
     */
    protected AddNoteCommand(Repository repo) {
        super(repo);
    }

    /** {@inheritDoc} */
    @Override
    public Note call() throws GitAPIException {
        checkCallable();
        NoteMap map = NoteMap.newEmptyMap();
        RevCommit notesCommit = null;
        try (RevWalk walk = new RevWalk(repo);
                ObjectInserter inserter = repo.newObjectInserter()) {
            Ref ref = repo.findRef(notesRef);
            // if we have a notes ref, use it
            if (ref != null) {
                notesCommit = walk.parseCommit(ref.getObjectId());
                map = NoteMap.read(walk.getObjectReader(), notesCommit);
            }
            map.set(id, message, inserter);
            commitNoteMap(repo, notesRef, walk, map, notesCommit, inserter,
                    "Notes added by 'git notes add'"); //$NON-NLS-1$
            return map.getNote(id);
        } catch (IOException e) {
            throw new JGitInternalException(e.getMessage(), e);
        }
    }

    /**
     * Sets the object id of object you want a note on. If the object already
     * has a note, the existing note will be replaced.
     *
     * @param id
     *            a {@link org.eclipse.jgit.revwalk.RevObject}
     * @return {@code this}
     */
    public AddNoteCommand setObjectId(RevObject id) {
        checkCallable();
        this.id = id;
        return this;
    }

    /**
     * Set the notes message
     *
     * @param message
     *            the notes message used when adding a note
     * @return {@code this}
     */
    public AddNoteCommand setMessage(String message) {
        checkCallable();
        this.message = message;
        return this;
    }

    static void commitNoteMap(Repository r, String ref, RevWalk walk,
            NoteMap map,
            RevCommit notesCommit,
            ObjectInserter inserter,
            String msg)
            throws IOException {
        // commit the note
        CommitBuilder builder = new CommitBuilder();
        builder.setTreeId(map.writeTree(inserter));
        builder.setAuthor(new PersonIdent(r));
        builder.setCommitter(builder.getAuthor());
        builder.setMessage(msg);
        if (notesCommit != null)
            builder.setParentIds(notesCommit);
        ObjectId commit = inserter.insert(builder);
        inserter.flush();
        RefUpdate refUpdate = r.updateRef(ref);
        if (notesCommit != null)
            refUpdate.setExpectedOldObjectId(notesCommit);
        else
            refUpdate.setExpectedOldObjectId(ObjectId.zeroId());
        refUpdate.setNewObjectId(commit);
        refUpdate.update(walk);
    }

    /**
     * Set name of a {@code Ref} to read notes from
     *
     * @param notesRef
     *            the ref to read notes from. Note, the default value of
     *            {@link org.eclipse.jgit.lib.Constants#R_NOTES_COMMITS} will be
     *            used if nothing is set
     * @return {@code this}
     * @see Constants#R_NOTES_COMMITS
     */
    public AddNoteCommand setNotesRef(String notesRef) {
        checkCallable();
        this.notesRef = notesRef;
        return this;
    }

}