org.eclipse.jgit/src/org/eclipse/jgit/patch/CombinedFileHeader.java - jgit - Git at Google

 /*
  * Copyright (C) 2008, Google Inc.
  * 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.patch;

 import static org.eclipse.jgit.lib.Constants.encodeASCII;
 import static org.eclipse.jgit.util.RawParseUtils.match;
 import static org.eclipse.jgit.util.RawParseUtils.nextLF;

 import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;

 import org.eclipse.jgit.lib.AbbreviatedObjectId;
 import org.eclipse.jgit.lib.FileMode;

 /**
  * A file in the Git "diff --cc" or "diff --combined" format.
  * <p>
  * A combined diff shows an n-way comparison between two or more ancestors and
  * the final revision. Its primary function is to perform code reviews on a
  * merge which introduces changes not in any ancestor.
  */
 public class CombinedFileHeader extends FileHeader {
 	private static final byte[] MODE = encodeASCII("mode "); //$NON-NLS-1$

 	private AbbreviatedObjectId[] oldIds;

 	private FileMode[] oldModes;

 	CombinedFileHeader(byte[] b, int offset) {
 		super(b, offset);
 	}

 	/** {@inheritDoc} */
 	@Override
 	@SuppressWarnings("unchecked")
 	public List<? extends CombinedHunkHeader> getHunks() {
 		return (List<CombinedHunkHeader>) super.getHunks();
 	}

 	/**
 	 * {@inheritDoc}
 	 * <p>
 	 *
 	 * @return number of ancestor revisions mentioned in this diff.
 	 */
 	@Override
 	public int getParentCount() {
 		return oldIds.length;
 	}

 	/**
 	 * {@inheritDoc}
 	 * <p>
 	 * @return get the file mode of the first parent.
 	 */
 	@Override
 	public FileMode getOldMode() {
 		return getOldMode(0);
 	}

 	/**
 	 * Get the file mode of the nth ancestor
 	 *
 	 * @param nthParent
 	 *            the ancestor to get the mode of
 	 * @return the mode of the requested ancestor.
 	 */
 	public FileMode getOldMode(int nthParent) {
 		return oldModes[nthParent];
 	}

 	/**
 	 * {@inheritDoc}
 	 * <p>
 	 *
 	 * @return get the object id of the first parent.
 	 */
 	@Override
 	public AbbreviatedObjectId getOldId() {
 		return getOldId(0);
 	}

 	/**
 	 * Get the ObjectId of the nth ancestor
 	 *
 	 * @param nthParent
 	 *            the ancestor to get the object id of
 	 * @return the id of the requested ancestor.
 	 */
 	public AbbreviatedObjectId getOldId(int nthParent) {
 		return oldIds[nthParent];
 	}

 	/** {@inheritDoc} */
 	@Override
 	public String getScriptText(Charset ocs, Charset ncs) {
 		final Charset[] cs = new Charset[getParentCount() + 1];
 		Arrays.fill(cs, ocs);
 		cs[getParentCount()] = ncs;
 		return getScriptText(cs);
 	}

 	/**
 	 * {@inheritDoc}
 	 * <p>
 	 * Convert the patch script for this file into a string.
 	 */
 	@Override
 	public String getScriptText(Charset[] charsetGuess) {
 		return super.getScriptText(charsetGuess);
 	}

 	@Override
 	int parseGitHeaders(int ptr, int end) {
 		while (ptr < end) {
 			final int eol = nextLF(buf, ptr);
 			if (isHunkHdr(buf, ptr, end) >= 1) {
 				// First hunk header; break out and parse them later.
 				break;

 			} else if (match(buf, ptr, OLD_NAME) >= 0) {
 				parseOldName(ptr, eol);

 			} else if (match(buf, ptr, NEW_NAME) >= 0) {
 				parseNewName(ptr, eol);

 			} else if (match(buf, ptr, INDEX) >= 0) {
 				parseIndexLine(ptr + INDEX.length, eol);

 			} else if (match(buf, ptr, MODE) >= 0) {
 				parseModeLine(ptr + MODE.length, eol);

 			} else if (match(buf, ptr, NEW_FILE_MODE) >= 0) {
 				parseNewFileMode(ptr, eol);

 			} else if (match(buf, ptr, DELETED_FILE_MODE) >= 0) {
 				parseDeletedFileMode(ptr + DELETED_FILE_MODE.length, eol);

 			} else {
 				// Probably an empty patch (stat dirty).
 				break;
 			}

 			ptr = eol;
 		}
 		return ptr;
 	}

 	/** {@inheritDoc} */
 	@Override
 	protected void parseIndexLine(int ptr, int eol) {
 		// "index $asha1,$bsha1..$csha1"
 		//
 		final List<AbbreviatedObjectId> ids = new ArrayList<>();
 		while (ptr < eol) {
 			final int comma = nextLF(buf, ptr, ',');
 			if (eol <= comma)
 				break;
 			ids.add(AbbreviatedObjectId.fromString(buf, ptr, comma - 1));
 			ptr = comma;
 		}

 		oldIds = new AbbreviatedObjectId[ids.size() + 1];
 		ids.toArray(oldIds);
 		final int dot2 = nextLF(buf, ptr, '.');
 		oldIds[ids.size()] = AbbreviatedObjectId.fromString(buf, ptr, dot2 - 1);
 		newId = AbbreviatedObjectId.fromString(buf, dot2 + 1, eol - 1);
 		oldModes = new FileMode[oldIds.length];
 	}

 	/** {@inheritDoc} */
 	@Override
 	protected void parseNewFileMode(int ptr, int eol) {
 		for (int i = 0; i < oldModes.length; i++)
 			oldModes[i] = FileMode.MISSING;
 		super.parseNewFileMode(ptr, eol);
 	}

 	@Override
 	HunkHeader newHunkHeader(int offset) {
 		return new CombinedHunkHeader(this, offset);
 	}

 	private void parseModeLine(int ptr, int eol) {
 		// "mode $amode,$bmode..$cmode"
 		//
 		int n = 0;
 		while (ptr < eol) {
 			final int comma = nextLF(buf, ptr, ',');
 			if (eol <= comma)
 				break;
 			oldModes[n++] = parseFileMode(ptr, comma);
 			ptr = comma;
 		}
 		final int dot2 = nextLF(buf, ptr, '.');
 		oldModes[n] = parseFileMode(ptr, dot2);
 		newMode = parseFileMode(dot2 + 1, eol);
 	}

 	private void parseDeletedFileMode(int ptr, int eol) {
 		// "deleted file mode $amode,$bmode"
 		//
 		changeType = ChangeType.DELETE;
 		int n = 0;
 		while (ptr < eol) {
 			final int comma = nextLF(buf, ptr, ',');
 			if (eol <= comma)
 				break;
 			oldModes[n++] = parseFileMode(ptr, comma);
 			ptr = comma;
 		}
 		oldModes[n] = parseFileMode(ptr, eol);
 		newMode = FileMode.MISSING;
 	}
 }
	/*
	* Copyright (C) 2008, Google Inc.
	* 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.patch;

	import static org.eclipse.jgit.lib.Constants.encodeASCII;
	import static org.eclipse.jgit.util.RawParseUtils.match;
	import static org.eclipse.jgit.util.RawParseUtils.nextLF;

	import java.nio.charset.Charset;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.List;

	import org.eclipse.jgit.lib.AbbreviatedObjectId;
	import org.eclipse.jgit.lib.FileMode;

	/**
	* A file in the Git "diff --cc" or "diff --combined" format.
	* <p>
	* A combined diff shows an n-way comparison between two or more ancestors and
	* the final revision. Its primary function is to perform code reviews on a
	* merge which introduces changes not in any ancestor.
	*/
	public class CombinedFileHeader extends FileHeader {
	private static final byte[] MODE = encodeASCII("mode "); //$NON-NLS-1$

	private AbbreviatedObjectId[] oldIds;

	private FileMode[] oldModes;

	CombinedFileHeader(byte[] b, int offset) {
	super(b, offset);
	}

	/** {@inheritDoc} */
	@Override
	@SuppressWarnings("unchecked")
	public List<? extends CombinedHunkHeader> getHunks() {
	return (List<CombinedHunkHeader>) super.getHunks();
	}

	/**
	* {@inheritDoc}
	* <p>
	*
	* @return number of ancestor revisions mentioned in this diff.
	*/
	@Override
	public int getParentCount() {
	return oldIds.length;
	}

	/**
	* {@inheritDoc}
	* <p>
	* @return get the file mode of the first parent.
	*/
	@Override
	public FileMode getOldMode() {
	return getOldMode(0);
	}

	/**
	* Get the file mode of the nth ancestor
	*
	* @param nthParent
	* the ancestor to get the mode of
	* @return the mode of the requested ancestor.
	*/
	public FileMode getOldMode(int nthParent) {
	return oldModes[nthParent];
	}

	/**
	* {@inheritDoc}
	* <p>
	*
	* @return get the object id of the first parent.
	*/
	@Override
	public AbbreviatedObjectId getOldId() {
	return getOldId(0);
	}

	/**
	* Get the ObjectId of the nth ancestor
	*
	* @param nthParent
	* the ancestor to get the object id of
	* @return the id of the requested ancestor.
	*/
	public AbbreviatedObjectId getOldId(int nthParent) {
	return oldIds[nthParent];
	}

	/** {@inheritDoc} */
	@Override
	public String getScriptText(Charset ocs, Charset ncs) {
	final Charset[] cs = new Charset[getParentCount() + 1];
	Arrays.fill(cs, ocs);
	cs[getParentCount()] = ncs;
	return getScriptText(cs);
	}

	/**
	* {@inheritDoc}
	* <p>
	* Convert the patch script for this file into a string.
	*/
	@Override
	public String getScriptText(Charset[] charsetGuess) {
	return super.getScriptText(charsetGuess);
	}

	@Override
	int parseGitHeaders(int ptr, int end) {
	while (ptr < end) {
	final int eol = nextLF(buf, ptr);
	if (isHunkHdr(buf, ptr, end) >= 1) {
	// First hunk header; break out and parse them later.
	break;

	} else if (match(buf, ptr, OLD_NAME) >= 0) {
	parseOldName(ptr, eol);

	} else if (match(buf, ptr, NEW_NAME) >= 0) {
	parseNewName(ptr, eol);

	} else if (match(buf, ptr, INDEX) >= 0) {
	parseIndexLine(ptr + INDEX.length, eol);

	} else if (match(buf, ptr, MODE) >= 0) {
	parseModeLine(ptr + MODE.length, eol);

	} else if (match(buf, ptr, NEW_FILE_MODE) >= 0) {
	parseNewFileMode(ptr, eol);

	} else if (match(buf, ptr, DELETED_FILE_MODE) >= 0) {
	parseDeletedFileMode(ptr + DELETED_FILE_MODE.length, eol);

	} else {
	// Probably an empty patch (stat dirty).
	break;
	}

	ptr = eol;
	}
	return ptr;
	}

	/** {@inheritDoc} */
	@Override
	protected void parseIndexLine(int ptr, int eol) {
	// "index $asha1,$bsha1..$csha1"
	//
	final List<AbbreviatedObjectId> ids = new ArrayList<>();
	while (ptr < eol) {
	final int comma = nextLF(buf, ptr, ',');
	if (eol <= comma)
	break;
	ids.add(AbbreviatedObjectId.fromString(buf, ptr, comma - 1));
	ptr = comma;
	}

	oldIds = new AbbreviatedObjectId[ids.size() + 1];
	ids.toArray(oldIds);
	final int dot2 = nextLF(buf, ptr, '.');
	oldIds[ids.size()] = AbbreviatedObjectId.fromString(buf, ptr, dot2 - 1);
	newId = AbbreviatedObjectId.fromString(buf, dot2 + 1, eol - 1);
	oldModes = new FileMode[oldIds.length];
	}

	/** {@inheritDoc} */
	@Override
	protected void parseNewFileMode(int ptr, int eol) {
	for (int i = 0; i < oldModes.length; i++)
	oldModes[i] = FileMode.MISSING;
	super.parseNewFileMode(ptr, eol);
	}

	@Override
	HunkHeader newHunkHeader(int offset) {
	return new CombinedHunkHeader(this, offset);
	}

	private void parseModeLine(int ptr, int eol) {
	// "mode $amode,$bmode..$cmode"
	//
	int n = 0;
	while (ptr < eol) {
	final int comma = nextLF(buf, ptr, ',');
	if (eol <= comma)
	break;
	oldModes[n++] = parseFileMode(ptr, comma);
	ptr = comma;
	}
	final int dot2 = nextLF(buf, ptr, '.');
	oldModes[n] = parseFileMode(ptr, dot2);
	newMode = parseFileMode(dot2 + 1, eol);
	}

	private void parseDeletedFileMode(int ptr, int eol) {
	// "deleted file mode $amode,$bmode"
	//
	changeType = ChangeType.DELETE;
	int n = 0;
	while (ptr < eol) {
	final int comma = nextLF(buf, ptr, ',');
	if (eol <= comma)
	break;
	oldModes[n++] = parseFileMode(ptr, comma);
	ptr = comma;
	}
	oldModes[n] = parseFileMode(ptr, eol);
	newMode = FileMode.MISSING;
	}
	}