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/*
* Copyright 2000-2011 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.codeInsight.lookup;
import com.intellij.codeInsight.completion.CompletionLookupArranger;
import com.intellij.openapi.util.Comparing;
import com.intellij.openapi.util.Ref;
import com.intellij.psi.ForceableComparable;
import com.intellij.util.ProcessingContext;
import java.util.IdentityHashMap;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* @author peter
*/
public class CachingComparingClassifier extends ComparingClassifier<LookupElement> {
private final Map<LookupElement, Comparable> myWeights = new IdentityHashMap<LookupElement, Comparable>();
private final LookupElementWeigher myWeigher;
private Ref<Comparable> myFirstWeight;
private boolean myPrimitive = true;
private int myPrefixChanges = -1;
public CachingComparingClassifier(Classifier<LookupElement> next, LookupElementWeigher weigher) {
super(next, weigher.toString(), weigher.isNegated());
myWeigher = weigher;
}
@Override
public final Comparable getWeight(LookupElement t) {
Comparable w = myWeights.get(t);
if (w == null && myWeigher.isPrefixDependent()) {
myWeights.put(t, w = myWeigher.weigh(t));
}
return w;
}
@Override
public Iterable<LookupElement> classify(Iterable<LookupElement> source, ProcessingContext context) {
if (!myWeigher.isPrefixDependent() && myPrimitive) {
return myNext.classify(source, context);
}
checkPrefixChanged(context);
return super.classify(source, context);
}
private void checkPrefixChanged(ProcessingContext context) {
int actualPrefixChanges = context.get(CompletionLookupArranger.PREFIX_CHANGES).intValue();
if (myWeigher.isPrefixDependent() && myPrefixChanges != actualPrefixChanges) {
myPrefixChanges = actualPrefixChanges;
myWeights.clear();
}
}
@Override
public void describeItems(LinkedHashMap<LookupElement, StringBuilder> map, ProcessingContext context) {
checkPrefixChanged(context);
super.describeItems(map, context);
}
@Override
public void addElement(LookupElement t) {
Comparable weight = myWeigher.weigh(t);
if (weight instanceof ForceableComparable) {
((ForceableComparable)weight).force();
}
if (!myWeigher.isPrefixDependent() && myPrimitive) {
if (myFirstWeight == null) {
myFirstWeight = Ref.create(weight);
} else if (!Comparing.equal(myFirstWeight.get(), weight)) {
myPrimitive = false;
}
}
myWeights.put(t, weight);
super.addElement(t);
}
}
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