105 lines
3.6 KiB
Java
105 lines
3.6 KiB
Java
/*
|
|
* Copyright 2018 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.io.Serializable;
|
|
import java.util.List;
|
|
import java.util.Objects;
|
|
/**
|
|
* Abstract delta between a source and a target.
|
|
*
|
|
* @author Tobias Warneke (t.warneke@gmx.net)
|
|
*/
|
|
public abstract class AbstractDelta<T> implements Serializable {
|
|
private final Chunk<T> source;
|
|
private final Chunk<T> target;
|
|
private final DeltaType type;
|
|
public AbstractDelta(DeltaType type, Chunk<T> source, Chunk<T> target) {
|
|
Objects.requireNonNull(source);
|
|
Objects.requireNonNull(target);
|
|
Objects.requireNonNull(type);
|
|
this.type = type;
|
|
this.source = source;
|
|
this.target = target;
|
|
}
|
|
public Chunk<T> getSource() {
|
|
return source;
|
|
}
|
|
public Chunk<T> getTarget() {
|
|
return target;
|
|
}
|
|
public DeltaType getType() {
|
|
return type;
|
|
}
|
|
/**
|
|
* Verify the chunk of this delta, to fit the target.
|
|
*
|
|
* @param target
|
|
* @throws PatchFailedException
|
|
*/
|
|
protected VerifyChunk verifyChunkToFitTarget(List<T> target) throws PatchFailedException {
|
|
return getSource().verifyChunk(target);
|
|
}
|
|
protected VerifyChunk verifyAndApplyTo(List<T> target) throws PatchFailedException {
|
|
final VerifyChunk verify = verifyChunkToFitTarget(target);
|
|
if (verify == VerifyChunk.OK) {
|
|
applyTo(target);
|
|
}
|
|
return verify;
|
|
}
|
|
protected abstract void applyTo(List<T> target) throws PatchFailedException;
|
|
protected abstract void restore(List<T> target);
|
|
/**
|
|
* Apply patch fuzzy.
|
|
*
|
|
* @param target the list this patch will be applied to
|
|
* @param fuzz the number of elements to ignore before/after the patched elements
|
|
* @param position the position this patch will be applied to. ignores {@code source.getPosition()}
|
|
* @see <a href="https://www.gnu.org/software/diffutils/manual/html_node/Inexact.html">Description of Fuzzy Patch</a> for more information.
|
|
*/
|
|
@SuppressWarnings("RedundantThrows")
|
|
protected void applyFuzzyToAt(List<T> target, int fuzz, int position) throws PatchFailedException {
|
|
throw new UnsupportedOperationException(this.getClass().getSimpleName() + " does not supports applying patch fuzzy");
|
|
}
|
|
/**
|
|
* Create a new delta of the actual instance with customized chunk data.
|
|
*/
|
|
public abstract AbstractDelta<T> withChunks(Chunk<T> original, Chunk<T> revised);
|
|
@Override
|
|
public int hashCode() {
|
|
return Objects.hash(this.source, this.target, this.type);
|
|
}
|
|
@Override
|
|
public boolean equals(Object obj) {
|
|
if (this == obj) {
|
|
return true;
|
|
}
|
|
if (obj == null) {
|
|
return false;
|
|
}
|
|
if (getClass() != obj.getClass()) {
|
|
return false;
|
|
}
|
|
final AbstractDelta<?> other = (AbstractDelta<?>) obj;
|
|
if (!Objects.equals(this.source, other.source)) {
|
|
return false;
|
|
}
|
|
if (!Objects.equals(this.target, other.target)) {
|
|
return false;
|
|
}
|
|
return this.type == other.type;
|
|
}
|
|
}
|