/*
* Copyright (C) 2007, Dave Watson <dwatson@mimvista.com>
* Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
* Copyright (C) 2007, Shawn O. Pearce <spearce@spearce.org>
*
* 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.lib;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.nio.charset.Charset;
import org.spearce.jgit.errors.CorruptObjectException;
import org.spearce.jgit.errors.MissingObjectException;
/**
* Instances of this class represent a Commit object. It represents a snapshot
* in a Git repository, who created it and when.
*/
public class Commit implements Treeish {
private static final ObjectId[] EMPTY_OBJECTID_LIST = new ObjectId[0];
private final Repository objdb;
private ObjectId commitId;
private ObjectId treeId;
private ObjectId[] parentIds;
private PersonIdent author;
private PersonIdent committer;
private String message;
private Tree treeObj;
private byte[] raw;
private Charset encoding;
/**
* Create an empty commit object. More information must be fed to this
* object to make it useful.
*
* @param db
* The repository with which to associate it.
*/
public Commit(final Repository db) {
objdb = db;
parentIds = EMPTY_OBJECTID_LIST;
}
/**
* Create a commit associated with these parents and associate it with a
* repository.
*
* @param db
* The repository to which this commit object belongs
* @param parentIds
* Id's of the parent(s)
*/
public Commit(final Repository db, final ObjectId[] parentIds) {
objdb = db;
this.parentIds = parentIds;
}
/**
* Create a commit object with the specified id and data from and existing
* commit object in a repository.
*
* @param db
* The repository to which this commit object belongs
* @param id
* Commit id
* @param raw
* Raw commit object data
*/
public Commit(final Repository db, final ObjectId id, final byte[] raw) {
objdb = db;
commitId = id;
treeId = ObjectId.fromString(raw, 5);
parentIds = new ObjectId[1];
int np=0;
int rawPtr = 46;
for (;;) {
if (raw[rawPtr] != 'p')
break;
if (np == 0) {
parentIds[np++] = ObjectId.fromString(raw, rawPtr + 7);
} else if (np == 1) {
parentIds = new ObjectId[] { parentIds[0], ObjectId.fromString(raw, rawPtr + 7) };
np++;
} else {
if (parentIds.length <= np) {
ObjectId[] old = parentIds;
parentIds = new ObjectId[parentIds.length+32];
for (int i=0; i<np; ++i)
parentIds[i] = old[i];
}
parentIds[np++] = ObjectId.fromString(raw, rawPtr + 7);
}
rawPtr += 48;
}
if (np != parentIds.length) {
ObjectId[] old = parentIds;
parentIds = new ObjectId[np];
for (int i=0; i<np; ++i)
parentIds[i] = old[i];
} else
if (np == 0)
parentIds = EMPTY_OBJECTID_LIST;
this.raw = raw;
}
/**
* @return get repository for the commit
*/
public Repository getRepository() {
return objdb;
}
/**
* @return The commit object id
*/
public ObjectId getCommitId() {
return commitId;
}
/**
* Set the id of this object.
*
* @param id
* the id that we calculated for this object.
*/
public void setCommitId(final ObjectId id) {
commitId = id;
}
public ObjectId getTreeId() {
return treeId;
}
/**
* Set the tree id for this commit object
*
* @param id
*/
public void setTreeId(final ObjectId id) {
if (treeId==null || !treeId.equals(id)) {
treeObj = null;
}
treeId = id;
}
public Tree getTree() throws IOException {
if (treeObj == null) {
treeObj = objdb.mapTree(getTreeId());
if (treeObj == null) {
throw new MissingObjectException(getTreeId(),
Constants.TYPE_TREE);
}
}
return treeObj;
}
/**
* Set the tree object for this commit
* @see #setTreeId
* @param t the Tree object
*/
public void setTree(final Tree t) {
treeId = t.getTreeId();
treeObj = t;
}
/**
* @return the author and authoring time for this commit
*/
public PersonIdent getAuthor() {
decode();
return author;
}
/**
* Set the author and authoring time for this commit
* @param a
*/
public void setAuthor(final PersonIdent a) {
author = a;
}
/**
* @return the committer and commit time for this object
*/
public PersonIdent getCommitter() {
decode();
return committer;
}
/**
* Set the committer and commit time for this object
* @param c the committer information
*/
public void setCommitter(final PersonIdent c) {
committer = c;
}
/**
* @return the object ids of this commit
*/
public ObjectId[] getParentIds() {
return parentIds;
}
/**
* @return the commit message
*/
public String getMessage() {
decode();
return message;
}
/**
* Set the parents of this commit
* @param parentIds
*/
public void setParentIds(ObjectId[] parentIds) {
this.parentIds = new ObjectId[parentIds.length];
for (int i=0; i<parentIds.length; ++i)
this.parentIds[i] = parentIds[i];
}
private void decode() {
// FIXME: handle I/O errors
if (raw != null) {
try {
DataInputStream br = new DataInputStream(new ByteArrayInputStream(raw));
String n = br.readLine();
if (n == null || !n.startsWith("tree ")) {
throw new CorruptObjectException(commitId, "no tree");
}
while ((n = br.readLine()) != null && n.startsWith("parent ")) {
// empty body
}
if (n == null || !n.startsWith("author ")) {
throw new CorruptObjectException(commitId, "no author");
}
String rawAuthor = n.substring("author ".length());
n = br.readLine();
if (n == null || !n.startsWith("committer ")) {
throw new CorruptObjectException(commitId, "no committer");
}
String rawCommitter = n.substring("committer ".length());
n = br.readLine();
if (n != null && n.startsWith( "encoding"))
encoding = Charset.forName(n.substring("encoding ".length()));
else
if (n == null || !n.equals("")) {
throw new CorruptObjectException(commitId,
"malformed header:"+n);
}
byte[] readBuf = new byte[br.available()]; // in-memory stream so this is all bytes left
br.read(readBuf);
int msgstart = readBuf.length != 0 ? ( readBuf[0] == '\n' ? 1 : 0 ) : 0;
if (encoding != null) {
// TODO: this isn't reliable so we need to guess the encoding from the actual content
author = new PersonIdent(new String(rawAuthor.getBytes(),encoding.name()));
committer = new PersonIdent(new String(rawCommitter.getBytes(),encoding.name()));
message = new String(readBuf,msgstart, readBuf.length-msgstart, encoding.name());
} else {
// TODO: use config setting / platform / ascii / iso-latin
author = new PersonIdent(new String(rawAuthor.getBytes()));
committer = new PersonIdent(new String(rawCommitter.getBytes()));
message = new String(readBuf, msgstart, readBuf.length-msgstart);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
raw = null;
}
}
}
/**
* Set the commit message
*
* @param m the commit message
*/
public void setMessage(final String m) {
message = m;
}
/**
* Persist this commit object
*
* @throws IOException
*/
public void commit() throws IOException {
if (getCommitId() != null)
throw new IllegalStateException("exists " + getCommitId());
setCommitId(new ObjectWriter(objdb).writeCommit(this));
}
public String toString() {
return "Commit[" + ObjectId.toString(getCommitId()) + " " + getAuthor() + "]";
}
/**
* State the encoding for the commit information
*
* @param e
* the encoding. See {@link Charset}
*/
public void setEncoding(String e) {
encoding = Charset.forName(e);
}
/**
* State the encoding for the commit information
*
* @param e
* the encoding. See {@link Charset}
*/
public void setEncoding(Charset e) {
encoding = e;
}
/**
* @return the encoding used. See {@link Charset}
*/
public String getEncoding() {
if (encoding != null)
return encoding.name();
else
return null;
}
}