| /* |
| * 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.AutoCompletionPolicy; |
| import com.intellij.codeInsight.lookup.LookupElement; |
| import com.intellij.psi.*; |
| import com.intellij.util.Consumer; |
| import org.jetbrains.annotations.NonNls; |
| import org.jetbrains.annotations.NotNull; |
| |
| import static com.intellij.psi.CommonClassNames.*; |
| |
| /** |
| * @author peter |
| */ |
| class CollectionsUtilityMethodsProvider { |
| private final PsiElement myElement; |
| private final PsiType myExpectedType; |
| private final PsiType myDefaultType; |
| @NotNull private final Consumer<LookupElement> myResult; |
| |
| CollectionsUtilityMethodsProvider(PsiElement position, |
| PsiType expectedType, |
| PsiType defaultType, @NotNull final Consumer<LookupElement> result) { |
| myResult = result; |
| myElement = position; |
| myExpectedType = expectedType; |
| myDefaultType = defaultType; |
| } |
| |
| public void addCompletions(boolean showAll) { |
| final PsiElement parent = myElement.getParent(); |
| if (parent instanceof PsiReferenceExpression && ((PsiReferenceExpression)parent).getQualifierExpression() != null) return; |
| |
| final PsiClass collectionsClass = |
| JavaPsiFacade.getInstance(myElement.getProject()).findClass(JAVA_UTIL_COLLECTIONS, myElement.getResolveScope()); |
| if (collectionsClass == null) return; |
| |
| final PsiElement pparent = parent.getParent(); |
| if (showAll || |
| pparent instanceof PsiReturnStatement || |
| pparent instanceof PsiConditionalExpression && pparent.getParent() instanceof PsiReturnStatement) { |
| addCollectionMethod(JAVA_UTIL_LIST, "emptyList", collectionsClass); |
| addCollectionMethod(JAVA_UTIL_SET, "emptySet", collectionsClass); |
| addCollectionMethod(JAVA_UTIL_MAP, "emptyMap", collectionsClass); |
| } |
| |
| if (showAll) { |
| addCollectionMethod(JAVA_UTIL_LIST, "singletonList", collectionsClass); |
| addCollectionMethod(JAVA_UTIL_SET, "singleton", collectionsClass); |
| addCollectionMethod(JAVA_UTIL_MAP, "singletonMap", collectionsClass); |
| |
| addCollectionMethod(JAVA_UTIL_COLLECTION, "unmodifiableCollection", collectionsClass); |
| addCollectionMethod(JAVA_UTIL_LIST, "unmodifiableList", collectionsClass); |
| addCollectionMethod(JAVA_UTIL_SET, "unmodifiableSet", collectionsClass); |
| addCollectionMethod(JAVA_UTIL_MAP, "unmodifiableMap", collectionsClass); |
| addCollectionMethod("java.util.SortedSet", "unmodifiableSortedSet", collectionsClass); |
| addCollectionMethod("java.util.SortedMap", "unmodifiableSortedMap", collectionsClass); |
| } |
| |
| } |
| |
| private void addCollectionMethod(final String baseClassName, |
| @NonNls final String method, @NotNull final PsiClass collectionsClass) { |
| if (isClassType(myExpectedType, baseClassName) || isClassType(myExpectedType, JAVA_UTIL_COLLECTION)) { |
| addMethodItem(myExpectedType, method, collectionsClass); |
| } else if (isClassType(myDefaultType, baseClassName) || isClassType(myDefaultType, JAVA_UTIL_COLLECTION)) { |
| addMethodItem(myDefaultType, method, collectionsClass); |
| } |
| } |
| |
| private void addMethodItem(PsiType expectedType, String methodName, PsiClass containingClass) { |
| final PsiMethod[] methods = containingClass.findMethodsByName(methodName, false); |
| if (methods.length == 0) { |
| return; |
| } |
| |
| final PsiMethod method = methods[0]; |
| final JavaMethodCallElement item = new JavaMethodCallElement(method, false, false); |
| item.setAutoCompletionPolicy(AutoCompletionPolicy.NEVER_AUTOCOMPLETE); |
| item.setInferenceSubstitutor(SmartCompletionDecorator.calculateMethodReturnTypeSubstitutor(method, expectedType), myElement); |
| myResult.consume(item); |
| } |
| |
| private static boolean isClassType(final PsiType type, final String className) { |
| if (type instanceof PsiClassType) { |
| final PsiClass psiClass = ((PsiClassType)type).resolve(); |
| return psiClass != null && className.equals(psiClass.getQualifiedName()); |
| } |
| return false; |
| } |
| |
| } |