Add GarbageCollectCommand to porcelain API

Bug: 394544
Change-Id: I73faa55d860db64efc3412fee27386df47552a75
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Signed-off-by: Chris Aniszczyk <zx@twitter.com>

3 files changed, 161 insertions, 0 deletions

diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/api/GarbageCollectCommand.java b/org.eclipse.jgit/src/org/eclipse/jgit/api/GarbageCollectCommand.java
new file mode 100644
index 0000000000..9dd6633579
--- /dev/null
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/api/GarbageCollectCommand.java
@@ -0,0 +1,144 @@
+/*
+ * Copyright (C) 2012, Matthias Sohn <matthias.sohn@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
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package org.eclipse.jgit.api;
+
+import java.io.IOException;
+import java.text.MessageFormat;
+import java.text.ParseException;
+import java.util.Date;
+import java.util.Properties;
+
+import org.eclipse.jgit.api.errors.GitAPIException;
+import org.eclipse.jgit.api.errors.JGitInternalException;
+import org.eclipse.jgit.internal.JGitText;
+import org.eclipse.jgit.lib.ProgressMonitor;
+import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.storage.file.FileRepository;
+import org.eclipse.jgit.storage.file.GC;
+import org.eclipse.jgit.storage.file.GC.RepoStatistics;
+import org.eclipse.jgit.util.GitDateParser;
+
+/**
+ * A class used to execute a {@code gc} 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()})
+ * 
+ * @since 2.2
+ * @see <a href="http://www.kernel.org/pub/software/scm/git/docs/git-gc.html"
+ *      >Git documentation about gc</a>
+ */
+public class GarbageCollectCommand extends GitCommand<Properties> {
+
+	private ProgressMonitor monitor;
+
+	private Date expire;
+
+	/**
+	 * @param repo
+	 */
+	protected GarbageCollectCommand(Repository repo) {
+		super(repo);
+		if (!(repo instanceof FileRepository))
+			throw new UnsupportedOperationException(MessageFormat.format(
+					JGitText.get().unsupportedGC, repo.getClass().toString()));
+	}
+
+	/**
+	 * @param monitor
+	 *            a progress monitor
+	 * @return this instance
+	 */
+	public GarbageCollectCommand setProgressMonitor(ProgressMonitor monitor) {
+		this.monitor = monitor;
+		return this;
+	}
+
+	/**
+	 * During gc() or prune() each unreferenced, loose object which has been
+	 * created or modified after <code>expire</code> will not be pruned. Only
+	 * older objects may be pruned. If set to null then every object is a
+	 * candidate for pruning. Use {@link GitDateParser} to parse time formats
+	 * used by git gc.
+	 *
+	 * @param expire
+	 *            minimal age of objects to be pruned.
+	 * @return this instance
+	 */
+	public GarbageCollectCommand setExpire(Date expire) {
+		this.expire = expire;
+		return this;
+	}
+
+	@Override
+	public Properties call() throws GitAPIException {
+		checkCallable();
+
+		GC gc = new GC((FileRepository) repo);
+		gc.setProgressMonitor(monitor);
+		if (this.expire != null)
+			gc.setExpire(expire);
+
+		try {
+			gc.gc();
+			return toProperties(gc.getStatistics());
+		} catch (IOException e) {
+			throw new JGitInternalException(JGitText.get().gcFailed, e);
+		} catch (ParseException e) {
+			throw new JGitInternalException(JGitText.get().gcFailed, e);
+		}
+	}
+
+	@SuppressWarnings("boxing")
+	private static Properties toProperties(RepoStatistics stats) {
+		Properties p = new Properties();
+		p.put("numberOfLooseObjects", stats.numberOfLooseObjects); //$NON-NLS-1$
+		p.put("numberOfLooseRefs", stats.numberOfLooseRefs); //$NON-NLS-1$
+		p.put("numberOfPackedObjects", stats.numberOfPackedObjects); //$NON-NLS-1$
+		p.put("numberOfPackedRefs", stats.numberOfPackedRefs); //$NON-NLS-1$
+		p.put("numberOfPackFiles", stats.numberOfPackFiles); //$NON-NLS-1$
+		p.put("sizeOfLooseObjects", stats.sizeOfLooseObjects); //$NON-NLS-1$
+		p.put("sizeOfPackedObjects", stats.sizeOfPackedObjects); //$NON-NLS-1$
+		return p;
+	}
+}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/api/Git.java b/org.eclipse.jgit/src/org/eclipse/jgit/api/Git.java
index 8a86af8763..77f951e16f 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/api/Git.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/api/Git.java
@@ -618,6 +618,21 @@ public class Git {
 	}
 
 	/**
+	 * Returns a command object to execute a {@code gc} command
+	 *
+	 * @see <a
+	 *      href="http://www.kernel.org/pub/software/scm/git/docs/git-gc.html"
+	 *      >Git documentation about gc</a>
+	 *
+	 * @return a {@link GarbageCollectCommand} used to collect all optional
+	 *         parameters and to finally execute the {@code gc} command
+	 * @since 2.2
+	 */
+	public GarbageCollectCommand gc() {
+		return new GarbageCollectCommand(repo);
+	}
+
+	/**
 	 * @return the git repository this class is interacting with
 	 */
 	public Repository getRepository() {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java
index 6a55ccef91..48963253c6 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java
@@ -270,6 +270,7 @@ public class JGitText extends TranslationBundle {
 	/***/ public String flagNotFromThis;
 	/***/ public String flagsAlreadyCreated;
 	/***/ public String funnyRefname;
+	/***/ public String gcFailed;
 	/***/ public String gitmodulesNotFound;
 	/***/ public String headRequiredToStash;
 	/***/ public String hoursAgo;
@@ -568,6 +569,7 @@ public class JGitText extends TranslationBundle {
 	/***/ public String unsupportedCommand0;
 	/***/ public String unsupportedEncryptionAlgorithm;
 	/***/ public String unsupportedEncryptionVersion;
+	/***/ public String unsupportedGC;
 	/***/ public String unsupportedOperationNotAddAtEnd;
 	/***/ public String unsupportedPackIndexVersion;
 	/***/ public String unsupportedPackVersion;