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/*
* Copyright (C) 2011, Stefan Lay <stefan.lay@.com> 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.diff;
import java.io.IOException;
import java.io.OutputStream;
import java.security.DigestOutputStream;
import java.security.MessageDigest;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.util.io.NullOutputStream;
/**
* A DiffFormatter used to calculate the patch-id of the diff.
*/
public class PatchIdDiffFormatter extends DiffFormatter {
private final MessageDigest digest;
/**
* Initialize a formatter to compute a patch id.
*/
public PatchIdDiffFormatter() {
super(new DigestOutputStream(NullOutputStream.INSTANCE,
Constants.newMessageDigest()));
digest = ((DigestOutputStream) getOutputStream()).getMessageDigest();
}
/**
* Should be called after having called one of the format methods
*
* @return the patch id calculated for the provided diff.
*/
public ObjectId getCalulatedPatchId() {
return ObjectId.fromRaw(digest.digest());
}
/** {@inheritDoc} */
@Override
protected void writeHunkHeader(int aStartLine, int aEndLine,
int bStartLine, int bEndLine) throws IOException {
// The hunk header is not taken into account for patch id calculation
}
/** {@inheritDoc} */
@Override
protected void formatIndexLine(OutputStream o, DiffEntry ent)
throws IOException {
// The index line is not taken into account for patch id calculation
}
}
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