CommitBuilder.java
/*
* Copyright (C) 2007, Dave Watson <dwatson@mimvista.com>
* Copyright (C) 2006, 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
* Copyright (C) 2006, 2020, Shawn O. Pearce <spearce@spearce.org> and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.lib;
import static java.nio.charset.StandardCharsets.UTF_8;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.util.List;
import org.eclipse.jgit.util.References;
/**
* Mutable builder to construct a commit recording the state of a project.
*
* Applications should use this object when they need to manually construct a
* commit and want precise control over its fields. For a higher level interface
* see {@link org.eclipse.jgit.api.CommitCommand}.
*
* To read a commit object, construct a {@link org.eclipse.jgit.revwalk.RevWalk}
* and obtain a {@link org.eclipse.jgit.revwalk.RevCommit} instance by calling
* {@link org.eclipse.jgit.revwalk.RevWalk#parseCommit(AnyObjectId)}.
*/
public class CommitBuilder extends ObjectBuilder {
private static final ObjectId[] EMPTY_OBJECTID_LIST = new ObjectId[0];
private static final byte[] htree = Constants.encodeASCII("tree"); //$NON-NLS-1$
private static final byte[] hparent = Constants.encodeASCII("parent"); //$NON-NLS-1$
private static final byte[] hauthor = Constants.encodeASCII("author"); //$NON-NLS-1$
private static final byte[] hcommitter = Constants.encodeASCII("committer"); //$NON-NLS-1$
private static final byte[] hgpgsig = Constants.encodeASCII("gpgsig"); //$NON-NLS-1$
private ObjectId treeId;
private ObjectId[] parentIds;
private PersonIdent committer;
/**
* Initialize an empty commit.
*/
public CommitBuilder() {
parentIds = EMPTY_OBJECTID_LIST;
}
/**
* Get id of the root tree listing this commit's snapshot.
*
* @return id of the root tree listing this commit's snapshot.
*/
public ObjectId getTreeId() {
return treeId;
}
/**
* Set the tree id for this commit object.
*
* @param id
* the tree identity.
*/
public void setTreeId(AnyObjectId id) {
treeId = id.copy();
}
/**
* Get the author of this commit (who wrote it).
*
* @return the author of this commit (who wrote it).
*/
@Override
public PersonIdent getAuthor() {
return super.getAuthor();
}
/**
* Set the author (name, email address, and date) of who wrote the commit.
*
* @param newAuthor
* the new author. Should not be null.
*/
@Override
public void setAuthor(PersonIdent newAuthor) {
super.setAuthor(newAuthor);
}
/**
* Get the committer and commit time for this object.
*
* @return the committer and commit time for this object.
*/
public PersonIdent getCommitter() {
return committer;
}
/**
* Set the committer and commit time for this object.
*
* @param newCommitter
* the committer information. Should not be null.
*/
public void setCommitter(PersonIdent newCommitter) {
committer = newCommitter;
}
/**
* Get the ancestors of this commit.
*
* @return the ancestors of this commit. Never null.
*/
public ObjectId[] getParentIds() {
return parentIds;
}
/**
* Set the parent of this commit.
*
* @param newParent
* the single parent for the commit.
*/
public void setParentId(AnyObjectId newParent) {
parentIds = new ObjectId[] { newParent.copy() };
}
/**
* Set the parents of this commit.
*
* @param parent1
* the first parent of this commit. Typically this is the current
* value of the {@code HEAD} reference and is thus the current
* branch's position in history.
* @param parent2
* the second parent of this merge commit. Usually this is the
* branch being merged into the current branch.
*/
public void setParentIds(AnyObjectId parent1, AnyObjectId parent2) {
parentIds = new ObjectId[] { parent1.copy(), parent2.copy() };
}
/**
* Set the parents of this commit.
*
* @param newParents
* the entire list of parents for this commit.
*/
public void setParentIds(ObjectId... newParents) {
parentIds = new ObjectId[newParents.length];
for (int i = 0; i < newParents.length; i++)
parentIds[i] = newParents[i].copy();
}
/**
* Set the parents of this commit.
*
* @param newParents
* the entire list of parents for this commit.
*/
public void setParentIds(List<? extends AnyObjectId> newParents) {
parentIds = new ObjectId[newParents.size()];
for (int i = 0; i < newParents.size(); i++)
parentIds[i] = newParents.get(i).copy();
}
/**
* Add a parent onto the end of the parent list.
*
* @param additionalParent
* new parent to add onto the end of the current parent list.
*/
public void addParentId(AnyObjectId additionalParent) {
if (parentIds.length == 0) {
setParentId(additionalParent);
} else {
ObjectId[] newParents = new ObjectId[parentIds.length + 1];
System.arraycopy(parentIds, 0, newParents, 0, parentIds.length);
newParents[parentIds.length] = additionalParent.copy();
parentIds = newParents;
}
}
/**
* Set the encoding for the commit information.
*
* @param encodingName
* the encoding name. See
* {@link java.nio.charset.Charset#forName(String)}.
* @deprecated use {@link #setEncoding(Charset)} instead.
*/
@Deprecated
public void setEncoding(String encodingName) {
setEncoding(Charset.forName(encodingName));
}
@Override
public byte[] build() throws UnsupportedEncodingException {
ByteArrayOutputStream os = new ByteArrayOutputStream();
OutputStreamWriter w = new OutputStreamWriter(os, getEncoding());
try {
os.write(htree);
os.write(' ');
getTreeId().copyTo(os);
os.write('\n');
for (ObjectId p : getParentIds()) {
os.write(hparent);
os.write(' ');
p.copyTo(os);
os.write('\n');
}
os.write(hauthor);
os.write(' ');
w.write(getAuthor().toExternalString());
w.flush();
os.write('\n');
os.write(hcommitter);
os.write(' ');
w.write(getCommitter().toExternalString());
w.flush();
os.write('\n');
GpgSignature signature = getGpgSignature();
if (signature != null) {
os.write(hgpgsig);
os.write(' ');
writeMultiLineHeader(signature.toExternalString(), os,
true);
os.write('\n');
}
writeEncoding(getEncoding(), os);
os.write('\n');
if (getMessage() != null) {
w.write(getMessage());
w.flush();
}
} catch (IOException err) {
// This should never occur, the only way to get it above is
// for the ByteArrayOutputStream to throw, but it doesn't.
//
throw new RuntimeException(err);
}
return os.toByteArray();
}
/**
* Format this builder's state as a commit object.
*
* @return this object in the canonical commit format, suitable for storage
* in a repository.
* @throws java.io.UnsupportedEncodingException
* the encoding specified by {@link #getEncoding()} is not
* supported by this Java runtime.
*/
public byte[] toByteArray() throws UnsupportedEncodingException {
return build();
}
/** {@inheritDoc} */
@SuppressWarnings("nls")
@Override
public String toString() {
StringBuilder r = new StringBuilder();
r.append("Commit");
r.append("={\n");
r.append("tree ");
r.append(treeId != null ? treeId.name() : "NOT_SET");
r.append("\n");
for (ObjectId p : parentIds) {
r.append("parent ");
r.append(p.name());
r.append("\n");
}
r.append("author ");
r.append(getAuthor() != null ? getAuthor().toString() : "NOT_SET");
r.append("\n");
r.append("committer ");
r.append(committer != null ? committer.toString() : "NOT_SET");
r.append("\n");
r.append("gpgSignature ");
GpgSignature signature = getGpgSignature();
r.append(signature != null ? signature.toString()
: "NOT_SET");
r.append("\n");
Charset encoding = getEncoding();
if (!References.isSameObject(encoding, UTF_8)) {
r.append("encoding ");
r.append(encoding.name());
r.append("\n");
}
r.append("\n");
r.append(getMessage() != null ? getMessage() : "");
r.append("}");
return r.toString();
}
}