/*
* Copyright 2000-2016 JetBrains s.r.o.
*
* 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.intellij.formatting;
import com.intellij.openapi.util.Pair;
import com.intellij.util.containers.ContainerUtil;
import java.util.*;
public class AlignmentCyclesDetector {
private final int myTotalAlignmentsCount;
private int myBlockRollbacks;
private LeafBlockWrapper myOffsetResponsibleBlock;
private int myBeforeTotalSpaces;
private Map<List<LeafBlockWrapper>, Set<Pair<Integer, Integer>>> map = ContainerUtil.newHashMap();
public AlignmentCyclesDetector(int totalAlignmentsCount) {
myTotalAlignmentsCount = totalAlignmentsCount;
}
public void registerOffsetResponsibleBlock(LeafBlockWrapper block) {
myOffsetResponsibleBlock = block;
myBeforeTotalSpaces = block.getWhiteSpace().getTotalSpaces();
}
public boolean isCycleDetected() {
return myBlockRollbacks > myTotalAlignmentsCount;
}
public void registerBlockRollback(LeafBlockWrapper currentBlock) {
List<LeafBlockWrapper> pairId = Arrays.asList(currentBlock, myOffsetResponsibleBlock);
Set<Pair<Integer, Integer>> pairs = map.get(pairId);
if (pairs == null) {
pairs = new HashSet<>();
map.put(pairId, pairs);
}
int newSpaces = myOffsetResponsibleBlock.getWhiteSpace().getTotalSpaces();
boolean added = pairs.add(Pair.create(myBeforeTotalSpaces, newSpaces));
if (added) {
myBlockRollbacks++;
}
}
}