| /* |
| * 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 org.jetbrains.annotations.Nullable; |
| |
| 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; |
| } |
| |
| @Nullable |
| @Override |
| public final Comparable getWeight(LookupElement element, ProcessingContext context) { |
| Comparable w = myWeights.get(element); |
| if (w == null && myWeigher.isPrefixDependent()) { |
| myWeights.put(element, w = myWeigher.weigh(element, context.get(CompletionLookupArranger.WEIGHING_CONTEXT))); |
| } |
| 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, ProcessingContext context) { |
| Comparable weight = myWeigher.weigh(t, context.get(CompletionLookupArranger.WEIGHING_CONTEXT)); |
| 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, context); |
| } |
| |
| } |