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/*
* Copyright (C) 2009-2010, Google Inc.
* Copyright (C) 2008-2009, Johannes E. Schindelin <johannes.schindelin@gmx.de>
* 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.diff;
import static org.eclipse.jgit.util.RawCharUtil.isWhitespace;
import static org.eclipse.jgit.util.RawCharUtil.trimTrailingWhitespace;
/**
* A version of {@link RawText} that ignores all whitespace.
*/
public class RawTextIgnoreAllWhitespace extends RawText {
/**
* Create a new sequence from an existing content byte array.
* <p>
* The entire array (indexes 0 through length-1) is used as the content.
*
* @param input
* the content array. The array is never modified, so passing
* through cached arrays is safe.
*/
public RawTextIgnoreAllWhitespace(byte[] input) {
super(input);
}
@Override
public boolean equals(final int i, final Sequence other, final int j) {
return equals(this, i + 1, (RawText) other, j + 1);
}
private static boolean equals(final RawText a, final int ai,
final RawText b, final int bi) {
if (a.hashes.get(ai) != b.hashes.get(bi))
return false;
int as = a.lines.get(ai);
int bs = b.lines.get(bi);
int ae = a.lines.get(ai + 1);
int be = b.lines.get(bi + 1);
ae = trimTrailingWhitespace(a.content, as, ae);
be = trimTrailingWhitespace(b.content, bs, be);
while (as < ae && bs < be) {
byte ac = a.content[as];
byte bc = b.content[bs];
while (as < ae - 1 && isWhitespace(ac)) {
as++;
ac = a.content[as];
}
while (bs < be - 1 && isWhitespace(bc)) {
bs++;
bc = b.content[bs];
}
if (ac != bc)
return false;
as++;
bs++;
}
return as == ae && bs == be;
}
@Override
protected int hashLine(final byte[] raw, int ptr, final int end) {
int hash = 5381;
for (; ptr < end; ptr++) {
byte c = raw[ptr];
if (!isWhitespace(c))
hash = (hash << 5) ^ (c & 0xff);
}
return hash;
}
}
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