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/*
* SPDX-License-Identifier: Apache-1.1
*
* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2003 The Apache Software Foundation.
* Copyright (c) 1996-2006 Juancarlo Añez
* Copyright (c) 2010 Dmitry Naumenko (dm.naumenko@gmail.com)
* Copyright (c) 2015-2016 Brenden Kromhout and contributors to java-diff-utils
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowledgement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgement may appear in the software itself,
* if and wherever such third-party acknowledgements normally appear.
*
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
* ITS 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package difflib;
import java.util.Arrays;
import java.util.List;
import javax.annotation.Nonnegative;
/**
* Holds the information about the part of text involved in the diff process <p> Text is represented as
* <code>Object[]</code> because the diff engine is capable of handling more than plain ascci. In fact, arrays or lists
* of any type that implements {@link java.lang.Object#hashCode hashCode()} and {@link java.lang.Object#equals equals()}
* correctly can be subject to differencing using this library. </p>
* @param <T> The type of the compared elements in the 'lines'.
* @author <a href="dm.naumenko@gmail.com>Dmitry Naumenko</a>
*/
public class Chunk<T> {
@Nonnegative
private final int position;
private List<T> lines;
/**
* Creates a chunk and saves a copy of affected lines
* @param position the start position
* @param lines the affected lines
*/
public Chunk(@Nonnegative int position, List<T> lines) {
if (position < 0) throw new IllegalArgumentException();
this.position = position;
this.lines = lines;
}
/**
* Creates a chunk and saves a copy of affected lines
* @param position the start position (zero-based numbering)
* @param lines the affected lines
*/
public Chunk(@Nonnegative int position, T[] lines) {
if (position < 0) throw new IllegalArgumentException();
this.position = position;
this.lines = Arrays.asList(lines);
}
/**
* Verifies that this chunk's saved text matches the corresponding text in the given sequence.
* @param target the sequence to verify against.
*/
public void verify(List<T> target) throws PatchFailedException {
if (last() > target.size()) {
throw new PatchFailedException("Incorrect Chunk: the position of chunk > target size");
}
for (int i = 0; i < size(); i++) {
if (!target.get(position + i).equals(lines.get(i))) {
throw new PatchFailedException(
"Incorrect Chunk: the chunk content doesn't match the target");
}
}
}
/**
* @return the start position of chunk in the text (zero-based numbering)
*/
@Nonnegative
public int getPosition() {
return position;
}
public void setLines(List<T> lines) {
this.lines = lines;
}
/**
* @return the affected lines
*/
public List<T> getLines() {
return lines;
}
@Nonnegative
public int size() {
return lines.size();
}
/**
* @return the index of the last line of the chunk. (zero-based numbering)
*/
@Nonnegative
public int last() {
return getPosition() + size() - 1;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((lines == null) ? 0 : lines.hashCode());
result = prime * result + position;
result = prime * result + size();
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Chunk<T> other = (Chunk) obj;
if (lines == null) {
if (other.lines != null)
return false;
} else if (!lines.equals(other.lines))
return false;
return position == other.position;
}
@Override
public String toString() {
return "[position: " + position + ", size: " + size() + ", lines: " + lines + "]";
}
}