Merge "Define a subsequence utility type"
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/*
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* Copyright (C) 2010, Google Inc.
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* and other copyright owners as documented in the project's IP log.
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*
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* This program and the accompanying materials are made available
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* under the terms of the Eclipse Distribution License v1.0 which
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* accompanies this distribution, is reproduced below, and is
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* available at http://www.eclipse.org/org/documents/edl-v10.php
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* - Neither the name of the Eclipse Foundation, Inc. nor the
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* names of its contributors may be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.eclipse.jgit.diff;
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/**
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* Wraps a {@link Sequence} to have a narrower range of elements.
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*
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* This sequence acts as a proxy for the real sequence, translating element
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* indexes on the fly by adding {@code begin} to them. Sequences of this type
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* must be used with a {@link SubsequenceComparator}.
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*
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* @param <S>
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* the base sequence type.
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*/
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public final class Subsequence<S extends Sequence> extends Sequence {
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final S base;
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final int begin;
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private final int size;
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/**
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* Construct a subset of another sequence.
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*
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* The size of the subsequence will be {@code end - begin}.
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*
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* @param base
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* the real sequence.
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* @param begin
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* First element index of {@code base} that will be part of this
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* new subsequence. The element at {@code begin} will be this
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* sequence's element 0.
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* @param end
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* One past the last element index of {@code base} that will be
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* part of this new subsequence.
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*/
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public Subsequence(S base, int begin, int end) {
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this.base = base;
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this.begin = begin;
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this.size = end - begin;
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}
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@Override
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public int size() {
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return size;
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}
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}
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@ -0,0 +1,79 @@
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/*
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* Copyright (C) 2010, Google Inc.
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* and other copyright owners as documented in the project's IP log.
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*
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* This program and the accompanying materials are made available
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* under the terms of the Eclipse Distribution License v1.0 which
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* accompanies this distribution, is reproduced below, and is
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* available at http://www.eclipse.org/org/documents/edl-v10.php
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* - Neither the name of the Eclipse Foundation, Inc. nor the
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* names of its contributors may be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
|
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.eclipse.jgit.diff;
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/**
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* Wrap another comparator for use with {@link Subsequence}.
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*
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* This comparator acts as a proxy for the real comparator, translating element
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* indexes on the fly by adding the subsequence's begin offset to them.
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* Comparators of this type must be used with a {@link Subsequence}.
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*
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* @param <S>
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* the base sequence type.
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*/
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public final class SubsequenceComparator<S extends Sequence> extends
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SequenceComparator<Subsequence<S>> {
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private final SequenceComparator<? super S> cmp;
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/**
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* Construct a comparator wrapping another comparator.
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*
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* @param cmp
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* the real comparator.
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*/
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public SubsequenceComparator(SequenceComparator<? super S> cmp) {
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this.cmp = cmp;
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}
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@Override
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public boolean equals(Subsequence<S> a, int ai, Subsequence<S> b, int bi) {
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return cmp.equals(a.base, ai + a.begin, b.base, bi + b.begin);
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}
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@Override
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public int hash(Subsequence<S> seq, int ptr) {
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return cmp.hash(seq.base, ptr + seq.begin);
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}
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}
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