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Copy pathChangeDelta.java
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75 lines (69 loc) · 2.4 KB
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/*
* Copyright 2009-2017 java-diff-utils.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.github.difflib.patch;
import java.util.List;
import java.util.Objects;
/**
* Describes the change-delta between original and revised texts.
*
* @author <a href="dm.naumenko@gmail.com">Dmitry Naumenko</a>
* @param <T> The type of the compared elements in the data 'lines'.
*/
public final class ChangeDelta<T> extends AbstractDelta<T> {
/**
* Creates a change delta with the two given chunks.
*
* @param source The source chunk. Must not be {@code null}.
* @param target The target chunk. Must not be {@code null}.
*/
public ChangeDelta(Chunk<T> source, Chunk<T> target) {
super(DeltaType.CHANGE, source, target);
Objects.requireNonNull(source, "source must not be null");
Objects.requireNonNull(target, "target must not be null");
}
@Override
public void applyTo(List<T> target) throws PatchFailedException {
verifyChunk(target);
int position = getSource().getPosition();
int size = getSource().size();
for (int i = 0; i < size; i++) {
target.remove(position);
}
int i = 0;
for (T line : getTarget().getLines()) {
target.add(position + i, line);
i++;
}
}
@Override
public void restore(List<T> target) {
int position = getTarget().getPosition();
int size = getTarget().size();
for (int i = 0; i < size; i++) {
target.remove(position);
}
int i = 0;
for (T line : getSource().getLines()) {
target.add(position + i, line);
i++;
}
}
@Override
public String toString() {
return "[ChangeDelta, position: " + getSource().getPosition() + ", lines: "
+ getSource().getLines() + " to " + getTarget().getLines() + "]";
}
}