/
MyersAlgorithm.java
executable file
·69 lines (59 loc) · 2.38 KB
/
MyersAlgorithm.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.servicecomb.toolkit.common;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jgit.diff.EditList;
import org.eclipse.jgit.diff.MyersDiff;
import org.eclipse.jgit.diff.RawText;
import org.eclipse.jgit.diff.RawTextComparator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class MyersAlgorithm implements CompareAlgorithm {
private static final Logger LOGGER = LoggerFactory.getLogger(MyersAlgorithm.class);
@Override
public List<Comparison> compare(String source, String dest) {
if ((source == null) || (dest == null)) {
LOGGER.error("Source is {} and dest is {}", source, dest);
throw new RuntimeException("Source and dest must not be null");
}
EditList diffList = new EditList();
diffList.addAll(MyersDiff.INSTANCE.diff(RawTextComparator.DEFAULT,
new RawText(source.getBytes()), new RawText(dest.getBytes())));
List<Comparison> comparisonList = new ArrayList<>();
diffList.stream().forEachOrdered(edit -> {
ComparisionType comparisionType;
switch (edit.getType()) {
case INSERT:
comparisionType = ComparisionType.INSERT;
break;
case DELETE:
comparisionType = ComparisionType.DELETE;
break;
case REPLACE:
comparisionType = ComparisionType.REPLACE;
break;
default:
comparisionType = ComparisionType.EQUAL;
break;
}
comparisonList
.add(new Comparison(comparisionType, edit.getBeginA(), edit.getEndA(), edit.getBeginB(), edit.getEndB()));
});
return comparisonList;
}
}