/*
* Copyright (C) 2009, Constantine Plotnikov <constantine.plotnikov@gmail.com>
* Copyright (C) 2009, Google Inc.
* Copyright (C) 2009, JetBrains s.r.o.
* 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.lib;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.MessageFormat;
import org.eclipse.jgit.JGitText;
import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.treewalk.TreeWalk;
import org.eclipse.jgit.util.RawParseUtils;
/**
* Configuration file based on the blobs stored in the repository.
*
* This implementation currently only provides reading support, and is primarily
* useful for supporting the {@code .gitmodules} file.
*/
public class BlobBasedConfig extends Config {
/**
* Parse a configuration from a byte array.
*
* @param base
* the base configuration file
* @param blob
* the byte array, should be UTF-8 encoded text.
* @throws ConfigInvalidException
* the byte array is not a valid configuration format.
*/
public BlobBasedConfig(Config base, final byte[] blob)
throws ConfigInvalidException {
super(base);
fromText(RawParseUtils.decode(blob));
}
/**
* Load a configuration file from a blob.
*
* @param base
* the base configuration file
* @param db
* the repository
* @param objectId
* the object identifier
* @throws IOException
* the blob cannot be read from the repository.
* @throws ConfigInvalidException
* the blob is not a valid configuration format.
*/
public BlobBasedConfig(Config base, Repository db, AnyObjectId objectId)
throws IOException, ConfigInvalidException {
this(base, read(db, objectId));
}
private static byte[] read(Repository db, AnyObjectId blobId)
throws MissingObjectException, IncorrectObjectTypeException,
IOException {
ObjectReader or = db.newObjectReader();
try {
return read(or, blobId);
} finally {
or.release();
}
}
private static byte[] read(ObjectReader or, AnyObjectId blobId)
throws MissingObjectException, IncorrectObjectTypeException,
IOException {
ObjectLoader loader = or.open(blobId, Constants.OBJ_BLOB);
return loader.getCachedBytes(Integer.MAX_VALUE);
}
/**
* Load a configuration file from a blob stored in a specific commit.
*
* @param base
* the base configuration file
* @param db
* the repository containing the objects.
* @param treeish
* the tree (or commit) that contains the object
* @param path
* the path within the tree
* @throws FileNotFoundException
* the path does not exist in the commit's tree.
* @throws IOException
* the tree and/or blob cannot be accessed.
* @throws ConfigInvalidException
* the blob is not a valid configuration format.
*/
public BlobBasedConfig(Config base, Repository db, AnyObjectId treeish,
String path) throws FileNotFoundException, IOException,
ConfigInvalidException {
this(base, read(db, treeish, path));
}
private static byte[] read(Repository db, AnyObjectId treeish, String path)
throws MissingObjectException, IncorrectObjectTypeException,
IOException {
ObjectReader or = db.newObjectReader();
try {
TreeWalk tree = TreeWalk.forPath(or, path, asTree(or, treeish));
if (tree == null)
throw new FileNotFoundException(MessageFormat.format(JGitText
.get().entryNotFoundByPath, path));
return read(or, tree.getObjectId(0));
} finally {
or.release();
}
}
private static AnyObjectId asTree(ObjectReader or, AnyObjectId treeish)
throws MissingObjectException, IncorrectObjectTypeException,
IOException {
if (treeish instanceof RevTree)
return treeish;
if (treeish instanceof RevCommit
&& ((RevCommit) treeish).getTree() != null)
return ((RevCommit) treeish).getTree();
return new RevWalk(or).parseTree(treeish).getId();
}
}