org.eclipse.egit.core.op.AssumeUnchangedOperation.java Source code

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Here is the source code for org.eclipse.egit.core.op.AssumeUnchangedOperation.java

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/*******************************************************************************
 * Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
 * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
 * Copyright (C) 2008, Google Inc.
 * Copyright (C) 2010, Matthias Sohn <matthias.sohn@sap.com>
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *******************************************************************************/
package org.eclipse.egit.core.op;

import java.io.IOException;
import java.util.Collection;
import java.util.IdentityHashMap;
import java.util.Map;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.jobs.ISchedulingRule;
import org.eclipse.core.runtime.jobs.MultiRule;
import org.eclipse.egit.core.Activator;
import org.eclipse.egit.core.CoreText;
import org.eclipse.egit.core.project.GitProjectData;
import org.eclipse.egit.core.project.RepositoryMapping;
import org.eclipse.jgit.dircache.DirCache;
import org.eclipse.jgit.dircache.DirCacheEntry;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.osgi.util.NLS;

/**
 * Tell JGit to ignore changes in selected files
 */
public class AssumeUnchangedOperation implements IEGitOperation {
    private final Collection<? extends IResource> rsrcList;

    private final IdentityHashMap<Repository, DirCache> caches;

    private final IdentityHashMap<RepositoryMapping, Object> mappings;

    private boolean assumeUnchanged;

    /**
     * Create a new operation to ignore changes in tracked files
     *
     * @param rsrcs
     *            collection of {@link IResource}s which should be ignored when
     *            looking for changes or committing.
     * @param assumeUnchanged
     *            {@code true} to set the assume-valid flag in the git index
     *            entry, {@code false} to unset the assume-valid flag in the git
     *            index entry
     */
    public AssumeUnchangedOperation(final Collection<? extends IResource> rsrcs, boolean assumeUnchanged) {
        rsrcList = rsrcs;
        caches = new IdentityHashMap<Repository, DirCache>();
        mappings = new IdentityHashMap<RepositoryMapping, Object>();
        this.assumeUnchanged = assumeUnchanged;
    }

    /* (non-Javadoc)
     * @see org.eclipse.egit.core.op.IEGitOperation#execute(org.eclipse.core.runtime.IProgressMonitor)
     */
    public void execute(IProgressMonitor m) throws CoreException {
        IProgressMonitor monitor;
        if (m == null)
            monitor = new NullProgressMonitor();
        else
            monitor = m;

        caches.clear();
        mappings.clear();

        monitor.beginTask(CoreText.AssumeUnchangedOperation_adding, rsrcList.size() * 200);
        try {
            for (IResource resource : rsrcList) {
                assumeValid(resource);
                monitor.worked(200);
            }

            for (Map.Entry<Repository, DirCache> e : caches.entrySet()) {
                final Repository db = e.getKey();
                final DirCache editor = e.getValue();
                monitor.setTaskName(NLS.bind(CoreText.AssumeUnchangedOperation_writingIndex, db.getDirectory()));
                editor.write();
                editor.commit();
            }
        } catch (RuntimeException e) {
            throw new CoreException(Activator.error(CoreText.UntrackOperation_failed, e));
        } catch (IOException e) {
            throw new CoreException(Activator.error(CoreText.UntrackOperation_failed, e));
        } finally {
            for (final RepositoryMapping rm : mappings.keySet())
                rm.fireRepositoryChanged();
            caches.clear();
            mappings.clear();
            monitor.done();
        }
    }

    /* (non-Javadoc)
     * @see org.eclipse.egit.core.op.IEGitOperation#getSchedulingRule()
     */
    public ISchedulingRule getSchedulingRule() {
        return new MultiRule(rsrcList.toArray(new IResource[rsrcList.size()]));
    }

    private void assumeValid(final IResource resource) throws CoreException {
        final IProject proj = resource.getProject();
        final GitProjectData pd = GitProjectData.get(proj);
        if (pd == null)
            return;
        final RepositoryMapping rm = pd.getRepositoryMapping(resource);
        if (rm == null)
            return;
        final Repository db = rm.getRepository();

        DirCache cache = caches.get(db);
        if (cache == null) {
            try {
                cache = db.lockDirCache();
            } catch (IOException err) {
                throw new CoreException(Activator.error(CoreText.UntrackOperation_failed, err));
            }
            caches.put(db, cache);
            mappings.put(rm, rm);
        }

        final String path = rm.getRepoRelativePath(resource);
        if (resource instanceof IContainer) {
            for (final DirCacheEntry ent : cache.getEntriesWithin(path))
                ent.setAssumeValid(assumeUnchanged);
        } else {
            final DirCacheEntry ent = cache.getEntry(path);
            if (ent != null)
                ent.setAssumeValid(assumeUnchanged);
        }
    }
}