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/*
* Copyright 2000-2009 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.completion;
import com.intellij.codeInsight.lookup.LookupElement;
import com.intellij.codeInsight.lookup.LookupItem;
import com.intellij.psi.PsiMethod;
import com.intellij.psi.PsiType;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.ArrayList;
import static com.intellij.util.ObjectUtils.assertNotNull;
/**
* @author peter
*/
public class JavaMethodMergingContributor extends CompletionContributor {
@Override
public AutoCompletionDecision handleAutoCompletionPossibility(@NotNull AutoCompletionContext context) {
final CompletionParameters parameters = context.getParameters();
if (parameters.getCompletionType() != CompletionType.SMART && parameters.getCompletionType() != CompletionType.BASIC) {
return null;
}
final LookupElement[] items = context.getItems();
if (items.length > 1) {
String commonName = null;
final ArrayList<PsiMethod> allMethods = new ArrayList<PsiMethod>();
for (LookupElement item : items) {
Object o = item.getPsiElement();
if (item.getUserData(LookupItem.FORCE_SHOW_SIGNATURE_ATTR) != null || !(o instanceof PsiMethod)) {
return AutoCompletionDecision.SHOW_LOOKUP;
}
final PsiMethod method = (PsiMethod)o;
final JavaChainLookupElement chain = item.as(JavaChainLookupElement.CLASS_CONDITION_KEY);
final String name = method.getName() + "#" + (chain == null ? "" : chain.getQualifier().getLookupString());
if (commonName != null && !commonName.equals(name)) {
return AutoCompletionDecision.SHOW_LOOKUP;
}
commonName = name;
allMethods.add(method);
item.putUserData(JavaCompletionUtil.ALL_METHODS_ATTRIBUTE, allMethods);
}
return AutoCompletionDecision.insertItem(findBestOverload(items));
}
return super.handleAutoCompletionPossibility(context);
}
public static LookupElement findBestOverload(LookupElement[] items) {
LookupElement best = items[0];
for (int i = 1; i < items.length; i++) {
LookupElement item = items[i];
if (getPriority(best) < getPriority(item)) {
best = item;
}
}
return best;
}
private static int getPriority(LookupElement element) {
PsiMethod method = assertNotNull(getItemMethod(element));
return (method.getReturnType() == PsiType.VOID ? 0 : 1) +
(method.getParameterList().getParametersCount() > 0 ? 2 : 0);
}
@Nullable
private static PsiMethod getItemMethod(LookupElement item) {
Object o = item.getPsiElement();
return o instanceof PsiMethod ? (PsiMethod)o : null;
}
}
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