org.eclipse.jgit.api.ApplyCommand Maven / Gradle / Ivy
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package org.eclipse.jgit.api;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.api.errors.PatchApplyException;
import org.eclipse.jgit.api.errors.PatchFormatException;
import org.eclipse.jgit.diff.DiffEntry.ChangeType;
import org.eclipse.jgit.diff.RawText;
import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.patch.FileHeader;
import org.eclipse.jgit.patch.HunkHeader;
import org.eclipse.jgit.patch.Patch;
import org.eclipse.jgit.util.FileUtils;
import org.eclipse.jgit.util.IO;
/**
* Apply a patch to files and/or to the index.
*
* @see Git documentation about apply
* @since 2.0
*/
public class ApplyCommand extends GitCommand {
private InputStream in;
/**
* Constructs the command if the patch is to be applied to the index.
*
* @param repo
*/
ApplyCommand(Repository repo) {
super(repo);
}
/**
* @param in
* the patch to apply
* @return this instance
*/
public ApplyCommand setPatch(InputStream in) {
checkCallable();
this.in = in;
return this;
}
/**
* Executes the {@code ApplyCommand} command with all the options and
* parameters collected by the setter methods (e.g.
* {@link #setPatch(InputStream)} of this class. Each instance of this class
* should only be used for one invocation of the command. Don't call this
* method twice on an instance.
*
* @return an {@link ApplyResult} object representing the command result
* @throws GitAPIException
* @throws PatchFormatException
* @throws PatchApplyException
*/
public ApplyResult call() throws GitAPIException, PatchFormatException,
PatchApplyException {
checkCallable();
ApplyResult r = new ApplyResult();
try {
final Patch p = new Patch();
try {
p.parse(in);
} finally {
in.close();
}
if (!p.getErrors().isEmpty())
throw new PatchFormatException(p.getErrors());
for (FileHeader fh : p.getFiles()) {
ChangeType type = fh.getChangeType();
File f = null;
switch (type) {
case ADD:
f = getFile(fh.getNewPath(), true);
apply(f, fh);
break;
case MODIFY:
f = getFile(fh.getOldPath(), false);
apply(f, fh);
break;
case DELETE:
f = getFile(fh.getOldPath(), false);
if (!f.delete())
throw new PatchApplyException(MessageFormat.format(
JGitText.get().cannotDeleteFile, f));
break;
case RENAME:
f = getFile(fh.getOldPath(), false);
File dest = getFile(fh.getNewPath(), false);
if (!f.renameTo(dest))
throw new PatchApplyException(MessageFormat.format(
JGitText.get().renameFileFailed, f, dest));
break;
case COPY:
f = getFile(fh.getOldPath(), false);
byte[] bs = IO.readFully(f);
FileWriter fw = new FileWriter(getFile(fh.getNewPath(),
true));
fw.write(new String(bs));
fw.close();
}
r.addUpdatedFile(f);
}
} catch (IOException e) {
throw new PatchApplyException(MessageFormat.format(
JGitText.get().patchApplyException, e.getMessage()), e);
}
setCallable(false);
return r;
}
private File getFile(String path, boolean create)
throws PatchApplyException {
File f = new File(getRepository().getWorkTree(), path);
if (create)
try {
FileUtils.createNewFile(f);
} catch (IOException e) {
throw new PatchApplyException(MessageFormat.format(
JGitText.get().createNewFileFailed, f), e);
}
return f;
}
/**
* @param f
* @param fh
* @throws IOException
* @throws PatchApplyException
*/
private void apply(File f, FileHeader fh)
throws IOException, PatchApplyException {
RawText rt = new RawText(f);
List oldLines = new ArrayList(rt.size());
for (int i = 0; i < rt.size(); i++)
oldLines.add(rt.getString(i));
List newLines = new ArrayList(oldLines);
for (HunkHeader hh : fh.getHunks()) {
StringBuilder hunk = new StringBuilder();
for (int j = hh.getStartOffset(); j < hh.getEndOffset(); j++)
hunk.append((char) hh.getBuffer()[j]);
RawText hrt = new RawText(hunk.toString().getBytes());
List hunkLines = new ArrayList(hrt.size());
for (int i = 0; i < hrt.size(); i++)
hunkLines.add(hrt.getString(i));
int pos = 0;
for (int j = 1; j < hunkLines.size(); j++) {
String hunkLine = hunkLines.get(j);
switch (hunkLine.charAt(0)) {
case ' ':
if (!newLines.get(hh.getNewStartLine() - 1 + pos).equals(
hunkLine.substring(1))) {
throw new PatchApplyException(MessageFormat.format(
JGitText.get().patchApplyException, hh));
}
pos++;
break;
case '-':
if (!newLines.get(hh.getNewStartLine() - 1 + pos).equals(
hunkLine.substring(1))) {
throw new PatchApplyException(MessageFormat.format(
JGitText.get().patchApplyException, hh));
}
newLines.remove(hh.getNewStartLine() - 1 + pos);
break;
case '+':
newLines.add(hh.getNewStartLine() - 1 + pos,
hunkLine.substring(1));
pos++;
break;
}
}
}
if (!isNoNewlineAtEndOfFile(fh))
newLines.add("");
if (!rt.isMissingNewlineAtEnd())
oldLines.add("");
if (!isChanged(oldLines, newLines))
return; // don't touch the file
StringBuilder sb = new StringBuilder();
final String eol = rt.size() == 0
|| (rt.size() == 1 && rt.isMissingNewlineAtEnd()) ? "\n" : rt
.getLineDelimiter();
for (String l : newLines) {
sb.append(l);
if (eol != null)
sb.append(eol);
}
sb.deleteCharAt(sb.length() - 1);
FileWriter fw = new FileWriter(f);
fw.write(sb.toString());
fw.close();
}
private boolean isChanged(List ol, List nl) {
if (ol.size() != nl.size())
return true;
for (int i = 0; i < ol.size(); i++)
if (!ol.get(i).equals(nl.get(i)))
return true;
return false;
}
private boolean isNoNewlineAtEndOfFile(FileHeader fh) {
HunkHeader lastHunk = fh.getHunks().get(fh.getHunks().size() - 1);
RawText lhrt = new RawText(lastHunk.getBuffer());
return lhrt.getString(lhrt.size() - 1).equals(
"\\ No newline at end of file"); //$NON-NLS-1$
}
}
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