/* * Copyright (C) 2010, Google Inc. * 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.storage.file; import java.io.File; import java.io.IOException; import java.util.Set; import org.eclipse.jgit.lib.AbbreviatedObjectId; import org.eclipse.jgit.lib.AnyObjectId; import org.eclipse.jgit.lib.ObjectDatabase; import org.eclipse.jgit.lib.ObjectId; import org.eclipse.jgit.lib.ObjectLoader; import org.eclipse.jgit.lib.ObjectReader; import org.eclipse.jgit.storage.pack.ObjectToPack; import org.eclipse.jgit.storage.pack.PackWriter; abstract class FileObjectDatabase extends ObjectDatabase { static enum InsertLooseObjectResult { INSERTED, EXISTS_PACKED, EXISTS_LOOSE, FAILURE; } @Override public ObjectReader newReader() { return new WindowCursor(this); } @Override public abstract ObjectDirectoryInserter newInserter(); /** * Does the requested object exist in this database? *
* Alternates (if present) are searched automatically.
*
* @param objectId
* identity of the object to test for existence of.
* @return true if the specified object is stored in this database, or any
* of the alternate databases.
*/
public boolean has(final AnyObjectId objectId) {
return hasObjectImpl1(objectId) || hasObjectImpl2(objectId.name());
}
final boolean hasObjectImpl1(final AnyObjectId objectId) {
if (hasObject1(objectId))
return true;
for (final AlternateHandle alt : myAlternates()) {
if (alt.db.hasObjectImpl1(objectId))
return true;
}
return tryAgain1() && hasObject1(objectId);
}
final boolean hasObjectImpl2(final String objectId) {
if (hasObject2(objectId))
return true;
for (final AlternateHandle alt : myAlternates()) {
if (alt.db.hasObjectImpl2(objectId))
return true;
}
return false;
}
abstract void resolve(Set
* Alternates (if present) are searched automatically.
*
* @param curs
* temporary working space associated with the calling thread.
* @param objectId
* identity of the object to open.
* @return a {@link ObjectLoader} for accessing the data of the named
* object, or null if the object does not exist.
* @throws IOException
*/
ObjectLoader openObject(final WindowCursor curs, final AnyObjectId objectId)
throws IOException {
ObjectLoader ldr;
ldr = openObjectImpl1(curs, objectId);
if (ldr != null)
return ldr;
ldr = openObjectImpl2(curs, objectId.name(), objectId);
if (ldr != null)
return ldr;
return null;
}
final ObjectLoader openObjectImpl1(final WindowCursor curs,
final AnyObjectId objectId) throws IOException {
ObjectLoader ldr;
ldr = openObject1(curs, objectId);
if (ldr != null)
return ldr;
for (final AlternateHandle alt : myAlternates()) {
ldr = alt.db.openObjectImpl1(curs, objectId);
if (ldr != null)
return ldr;
}
if (tryAgain1()) {
ldr = openObject1(curs, objectId);
if (ldr != null)
return ldr;
}
return null;
}
final ObjectLoader openObjectImpl2(final WindowCursor curs,
final String objectName, final AnyObjectId objectId)
throws IOException {
ObjectLoader ldr;
ldr = openObject2(curs, objectName, objectId);
if (ldr != null)
return ldr;
for (final AlternateHandle alt : myAlternates()) {
ldr = alt.db.openObjectImpl2(curs, objectName, objectId);
if (ldr != null)
return ldr;
}
return null;
}
long getObjectSize(WindowCursor curs, AnyObjectId objectId)
throws IOException {
long sz = getObjectSizeImpl1(curs, objectId);
if (0 <= sz)
return sz;
return getObjectSizeImpl2(curs, objectId.name(), objectId);
}
final long getObjectSizeImpl1(final WindowCursor curs,
final AnyObjectId objectId) throws IOException {
long sz;
sz = getObjectSize1(curs, objectId);
if (0 <= sz)
return sz;
for (final AlternateHandle alt : myAlternates()) {
sz = alt.db.getObjectSizeImpl1(curs, objectId);
if (0 <= sz)
return sz;
}
if (tryAgain1()) {
sz = getObjectSize1(curs, objectId);
if (0 <= sz)
return sz;
}
return -1;
}
final long getObjectSizeImpl2(final WindowCursor curs,
final String objectName, final AnyObjectId objectId)
throws IOException {
long sz;
sz = getObjectSize2(curs, objectName, objectId);
if (0 <= sz)
return sz;
for (final AlternateHandle alt : myAlternates()) {
sz = alt.db.getObjectSizeImpl2(curs, objectName, objectId);
if (0 <= sz)
return sz;
}
return -1;
}
abstract void selectObjectRepresentation(PackWriter packer,
ObjectToPack otp, WindowCursor curs) throws IOException;
abstract File getDirectory();
abstract AlternateHandle[] myAlternates();
abstract boolean tryAgain1();
abstract boolean hasObject1(AnyObjectId objectId);
abstract boolean hasObject2(String objectId);
abstract ObjectLoader openObject1(WindowCursor curs, AnyObjectId objectId)
throws IOException;
abstract ObjectLoader openObject2(WindowCursor curs, String objectName,
AnyObjectId objectId) throws IOException;
abstract long getObjectSize1(WindowCursor curs, AnyObjectId objectId)
throws IOException;
abstract long getObjectSize2(WindowCursor curs, String objectName,
AnyObjectId objectId) throws IOException;
abstract InsertLooseObjectResult insertUnpackedObject(File tmp,
ObjectId id, boolean createDuplicate);
abstract FileObjectDatabase newCachedFileObjectDatabase();
static class AlternateHandle {
final FileObjectDatabase db;
AlternateHandle(FileObjectDatabase db) {
this.db = db;
}
void close() {
db.close();
}
}
static class AlternateRepository extends AlternateHandle {
final FileRepository repository;
AlternateRepository(FileRepository r) {
super(r.getObjectDatabase());
repository = r;
}
void close() {
repository.close();
}
}
}