357 lines
No EOL
10 KiB
Java
357 lines
No EOL
10 KiB
Java
/*
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* ====================================================================
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*
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 1999-2003 The Apache Software Foundation.
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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 without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution, if
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* any, must include the following acknowlegement:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowlegement may appear in the software itself,
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* if and wherever such third-party acknowlegements normally appear.
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*
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* 4. The names "The Jakarta Project", "Commons", and "Apache Software
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* Foundation" must not be used to endorse or promote products derived
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* from this software without prior written permission. For written
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* permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache"
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* nor may "Apache" appear in their names without prior written
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* permission of the Apache Group.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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*/
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package org.apache.commons.jrcs.diff;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Iterator;
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import java.util.List;
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/**
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* Holds a information about a parrt of the text involved in
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* a differencing or patching operation.
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*
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* @version $Id: Chunk.java,v 1.1 2003/07/14 12:22:29 dchandler Exp $
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* @author <a href="mailto:juanco@suigeneris.org">Juanco Anez</a>
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* @see Diff
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* @see Delta
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*/
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public class Chunk
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extends org.apache.commons.jrcs.util.ToString
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{
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protected int anchor;
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protected int count;
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protected List chunk;
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/**
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* Creates a chunk that doesn't copy the original text.
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* @param pos the start position in the text.
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* @param count the size of the chunk.
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*/
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public Chunk(int pos, int count)
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{
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this.anchor = pos;
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this.count = (count >= 0 ? count : 0);
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}
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/**
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* Creates a chunk and saves a copy the original chunk's text.
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* @param iseq the original text.
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* @param pos the start position in the text.
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* @param count the size of the chunk.
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*/
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public Chunk(Object[] iseq, int pos, int count)
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{
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this(pos, count);
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chunk = slice(iseq, pos, count);
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}
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/**
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* Creates a chunk that will be displaced in the resulting text,
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* and saves a copy the original chunk's text.
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* @param iseq the original text.
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* @param pos the start position in the text.
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* @param count the size of the chunk.
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* @param offset the position the chunk should have in the resulting text.
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*/
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public Chunk(Object[] iseq, int pos, int count, int offset)
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{
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this(offset, count);
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chunk = slice(iseq, pos, count);
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}
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/**
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* Creates a chunk and saves a copy the original chunk's text.
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* @param iseq the original text.
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* @param pos the start position in the text.
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* @param count the size of the chunk.
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*/
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public Chunk(List iseq, int pos, int count)
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{
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this(pos, count);
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chunk = slice(iseq, pos, count);
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}
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/**
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* Creates a chunk that will be displaced in the resulting text,
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* and saves a copy the original chunk's text.
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* @param iseq the original text.
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* @param pos the start position in the text.
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* @param count the size of the chunk.
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* @param offset the position the chunk should have in the resulting text.
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*/
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public Chunk(List iseq, int pos, int count, int offset)
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{
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this(offset, count);
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chunk = slice(iseq, pos, count);
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}
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/**
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* Returns the anchor position of the chunk.
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* @return the anchor position.
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*/
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public int anchor()
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{
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return anchor;
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}
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/**
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* Returns the size of the chunk.
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* @return the size.
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*/
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public int size()
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{
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return count;
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}
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/**
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* Returns the index of the first line of the chunk.
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*/
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public int first()
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{
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return anchor();
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}
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/**
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* Returns the index of the last line of the chunk.
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*/
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public int last()
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{
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return anchor() + size() - 1;
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}
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/**
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* Returns the <i>from</i> index of the chunk in RCS terms.
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*/
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public int rcsfrom()
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{
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return anchor + 1;
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}
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/**
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* Returns the <i>to</i> index of the chunk in RCS terms.
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*/
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public int rcsto()
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{
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return anchor + count;
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}
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/**
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* Returns the text saved for this chunk.
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* @return the text.
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*/
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public List chunk()
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{
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return chunk;
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}
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/**
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* Verifies that this chunk's saved text matches the corresponding
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* text in the given sequence.
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* @param target the sequence to verify against.
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* @return true if the texts match.
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*/
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public boolean verify(List target)
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{
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if (chunk == null)
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{
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return true;
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}
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if (last() > target.size())
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{
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return false;
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}
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for (int i = 0; i < count; i++)
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{
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if (!target.get(anchor + i).equals(chunk.get(i)))
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{
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return false;
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}
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}
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return true;
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}
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/**
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* Delete this chunk from he given text.
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* @param target the text to delete from.
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*/
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public void applyDelete(List target)
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{
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for (int i = last(); i >= first(); i--)
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{
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target.remove(i);
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}
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}
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/**
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* Add the text of this chunk to the target at the given position.
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* @param start where to add the text.
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* @param target the text to add to.
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*/
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public void applyAdd(int start, List target)
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{
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Iterator i = chunk.iterator();
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while (i.hasNext())
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{
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target.add(start++, i.next());
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}
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}
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/**
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* Provide a string image of the chunk using the an empty prefix and
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* postfix.
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*/
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public void toString(StringBuffer s)
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{
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toString(s, "", "");
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}
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/**
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* Provide a string image of the chunk using the given prefix and
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* postfix.
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* @param s where the string image should be appended.
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* @param prefix the text thatshould prefix each line.
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* @param postfix the text that should end each line.
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*/
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public StringBuffer toString(StringBuffer s, String prefix, String postfix)
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{
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if (chunk != null)
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{
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Iterator i = chunk.iterator();
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while (i.hasNext())
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{
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s.append(prefix);
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s.append(i.next());
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s.append(postfix);
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}
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}
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return s;
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}
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/**
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* Retreives the specified part from a {@link List List}.
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* @param seq the list to retreive a slice from.
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* @param pos the start position.
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* @param count the number of items in the slice.
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* @return a {@link List List} containing the specified items.
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*/
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public static List slice(List seq, int pos, int count)
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{
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if (count <= 0)
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{
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return new ArrayList(seq.subList(pos, pos));
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}
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else
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{
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return new ArrayList(seq.subList(pos, pos + count));
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}
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}
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/**
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* Retrieves a slice from an {@link Object Object} array.
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* @param seq the list to retreive a slice from.
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* @param pos the start position.
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* @param count the number of items in the slice.
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* @return a {@link List List} containing the specified items.
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*/
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public static List slice(Object[] seq, int pos, int count)
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{
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return slice(Arrays.asList(seq), pos, count);
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}
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/**
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* Provide a string representation of the numeric range of this chunk.
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*/
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public String rangeString()
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{
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StringBuffer result = new StringBuffer();
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rangeString(result);
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return result.toString();
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}
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/**
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* Provide a string representation of the numeric range of this chunk.
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* @param s where the string representation should be appended.
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*/
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public void rangeString(StringBuffer s)
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{
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rangeString(s, ",");
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}
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/**
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* Provide a string representation of the numeric range of this chunk.
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* @param s where the string representation should be appended.
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* @param separ what to use as line separator.
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*/
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public void rangeString(StringBuffer s, String separ)
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{
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if (size() <= 1)
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{
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s.append(Integer.toString(rcsfrom()));
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}
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else
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{
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s.append(Integer.toString(rcsfrom()));
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s.append(separ);
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s.append(Integer.toString(rcsto()));
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}
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}
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} |