patch, 5 partsSupport receive.fsckobjects

diff --git a/org.spearce.jgit/src/org/spearce/jgit/transport/BundleWriter.java b/org.spearce.jgit/src/org/spearce/jgit/transport/BundleWriter.java
new file mode 100644
index 0000000..f0fbd37
--- /dev/null
+++ b/org.spearce.jgit/src/org/spearce/jgit/transport/BundleWriter.java
@@ -0,0 +1,196 @@
+/*
+ * Copyright (C) 2008, Google Inc.
+ *
+ * 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 Git Development Community 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.spearce.jgit.transport;
+
+import java.io.BufferedOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+import java.io.Writer;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.TreeMap;
+
+import org.spearce.jgit.lib.AnyObjectId;
+import org.spearce.jgit.lib.Constants;
+import org.spearce.jgit.lib.ObjectId;
+import org.spearce.jgit.lib.PackWriter;
+import org.spearce.jgit.lib.ProgressMonitor;
+import org.spearce.jgit.lib.Ref;
+import org.spearce.jgit.lib.Repository;
+import org.spearce.jgit.revwalk.RevCommit;
+
+/**
+ * Creates a Git bundle file, for sneaker-net transport to another system.
+ * <p>
+ * Bundles generated by this class can be later read in from a file URI using
+ * the bundle transport, or from an application controlled buffer by the more
+ * generic {@link TransportBundleStream}.
+ * <p>
+ * Applications creating bundles need to call one or more <code>include</code>
+ * calls to reflect which objects should be available as refs in the bundle for
+ * the other side to fetch. At least one include is required to create a valid
+ * bundle file, and duplicate names are not permitted.
+ * <p>
+ * Optional <code>assume</code> calls can be made to declare commits which the
+ * recipient must have in order to fetch from the bundle file. Objects reachable
+ * from these assumed commits can be used as delta bases in order to reduce the
+ * overall bundle size.
+ */
+public class BundleWriter {
+	private final PackWriter packWriter;
+
+	private final Map<String, ObjectId> include;
+
+	private final Set<RevCommit> assume;
+
+	/**
+	 * Create a writer for a bundle.
+	 * 
+	 * @param repo
+	 *            repository where objects are stored.
+	 * @param monitor
+	 *            operations progress monitor.
+	 */
+	public BundleWriter(final Repository repo, final ProgressMonitor monitor) {
+		packWriter = new PackWriter(repo, monitor);
+		include = new TreeMap<String, ObjectId>();
+		assume = new HashSet<RevCommit>();
+	}
+
+	/**
+	 * Include an object (and everything reachable from it) in the bundle.
+	 * 
+	 * @param name
+	 *            name the recipient can discover this object as from the
+	 *            bundle's list of advertised refs . The name must be a valid
+	 *            ref format and must not have already been included in this
+	 *            bundle writer.
+	 * @param id
+	 *            object to pack. Multiple refs may point to the same object.
+	 */
+	public void include(final String name, final AnyObjectId id) {
+		if (!Repository.isValidRefName(name))
+			throw new IllegalArgumentException("Invalid ref name: " + name);
+		if (include.containsKey(name))
+			throw new IllegalStateException("Duplicate ref: " + name);
+		include.put(name, id.toObjectId());
+	}
+
+	/**
+	 * Include a single ref (a name/object pair) in the bundle.
+	 * <p>
+	 * This is a utility function for:
+	 * <code>include(r.getName(), r.getObjectId())</code>.
+	 * 
+	 * @param r
+	 *            the ref to include.
+	 */
+	public void include(final Ref r) {
+		include(r.getName(), r.getObjectId());
+	}
+
+	/**
+	 * Assume a commit is available on the recipient's side.
+	 * <p>
+	 * In order to fetch from a bundle the recipient must have any assumed
+	 * commit. Each assumed commit is explicitly recorded in the bundle header
+	 * to permit the recipient to validate it has these objects.
+	 * 
+	 * @param c
+	 *            the commit to assume being available. This commit should be
+	 *            parsed and not disposed in order to maximize the amount of
+	 *            debugging information available in the bundle stream.
+	 */
+	public void assume(final RevCommit c) {
+		if (c != null)
+			assume.add(c);
+	}
+
+	/**
+	 * Generate and write the bundle to the output stream.
+	 * <p>
+	 * This method can only be called once per BundleWriter instance.
+	 * 
+	 * @param os
+	 *            the stream the bundle is written to. If the stream is not
+	 *            buffered it will be buffered by the writer. Caller is
+	 *            responsible for closing the stream.
+	 * @throws IOException
+	 *             an error occurred reading a local object's data to include in
+	 *             the bundle, or writing compressed object data to the output
+	 *             stream.
+	 */
+	public void writeBundle(OutputStream os) throws IOException {
+		if (!(os instanceof BufferedOutputStream))
+			os = new BufferedOutputStream(os);
+
+		final HashSet<ObjectId> inc = new HashSet<ObjectId>();
+		final HashSet<ObjectId> exc = new HashSet<ObjectId>();
+		inc.addAll(include.values());
+		for (final RevCommit r : assume)
+			exc.add(r.getId());
+		packWriter.preparePack(inc, exc, exc.size() > 0, true);
+
+		final Writer w = new OutputStreamWriter(os, Constants.CHARSET);
+		w.write(TransportBundle.V2_BUNDLE_SIGNATURE);
+		w.write('\n');
+
+		final char[] tmp = new char[Constants.OBJECT_ID_LENGTH * 2];
+		for (final RevCommit a : assume) {
+			w.write('-');
+			a.copyTo(tmp, w);
+			if (a.getRawBuffer() != null) {
+				w.write(' ');
+				w.write(a.getShortMessage());
+			}
+			w.write('\n');
+		}
+		for (final Map.Entry<String, ObjectId> e : include.entrySet()) {
+			e.getValue().copyTo(tmp, w);
+			w.write(' ');
+			w.write(e.getKey());
+			w.write('\n');
+		}
+
+		w.write('\n');
+		w.flush();
+		packWriter.writePack(os);
+	}
+}