| /* |
| * 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.psi.filters.types; |
| |
| import com.intellij.psi.*; |
| import com.intellij.psi.filters.ElementFilter; |
| import com.intellij.psi.filters.FilterUtil; |
| import com.intellij.psi.infos.CandidateInfo; |
| import com.intellij.psi.util.PsiUtil; |
| import org.jetbrains.annotations.Nullable; |
| |
| |
| /** |
| * Created by IntelliJ IDEA. |
| * User: ik |
| * Date: 28.01.2003 |
| * Time: 20:53:38 |
| * To change this template use Options | File Templates. |
| */ |
| public class AssignableFromFilter implements ElementFilter{ |
| private PsiType myType = null; |
| private String myClassName = null; |
| |
| public AssignableFromFilter(PsiType type){ |
| myType = type; |
| } |
| |
| public AssignableFromFilter(final String className) { |
| myClassName = className; |
| } |
| |
| public AssignableFromFilter(){} |
| |
| @Override |
| public boolean isClassAcceptable(Class hintClass){ |
| return true; |
| } |
| |
| @Override |
| public boolean isAcceptable(Object element, PsiElement context){ |
| PsiType type = myType; |
| if(type == null) { |
| JavaPsiFacade psiFacade = JavaPsiFacade.getInstance(context.getProject()); |
| final PsiClass aClass = psiFacade.findClass(myClassName, context.getResolveScope()); |
| if (aClass != null) { |
| type = psiFacade.getElementFactory().createType(aClass, PsiSubstitutor.EMPTY); |
| } |
| else { |
| type = null; |
| } |
| } |
| if(type == null) return false; |
| if(element == null) return false; |
| if (element instanceof PsiType) return type.isAssignableFrom((PsiType) element); |
| |
| PsiSubstitutor substitutor = null; |
| |
| if(element instanceof CandidateInfo){ |
| final CandidateInfo info = (CandidateInfo)element; |
| substitutor = info.getSubstitutor(); |
| element = info.getElement(); |
| } |
| |
| return isAcceptable((PsiElement)element, context, type, substitutor); |
| } |
| |
| public static boolean isAcceptable(PsiElement element, PsiElement context, PsiType expectedType, PsiSubstitutor substitutor) { |
| if (element instanceof PsiMethod && isReturnTypeInferrable((PsiMethod)element, context, expectedType, substitutor)) { |
| return true; |
| } |
| |
| PsiType typeByElement = FilterUtil.getTypeByElement(element, context); |
| if (typeByElement == null) { |
| return false; |
| } |
| |
| if(substitutor != null) { |
| typeByElement = substitutor.substitute(typeByElement); |
| } |
| |
| if (!allowBoxing(context) && (expectedType instanceof PsiPrimitiveType != typeByElement instanceof PsiPrimitiveType)) { |
| return false; |
| } |
| |
| return expectedType.isAssignableFrom(typeByElement); |
| } |
| |
| private static boolean allowBoxing(PsiElement place) { |
| final PsiElement parent = place.getParent(); |
| if (parent.getParent() instanceof PsiSynchronizedStatement) { |
| final PsiSynchronizedStatement statement = (PsiSynchronizedStatement)parent.getParent(); |
| if (parent.equals(statement.getLockExpression())) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| private static boolean isReturnTypeInferrable(PsiMethod method, PsiElement place, PsiType expectedType, @Nullable PsiSubstitutor substitutor) { |
| final PsiResolveHelper helper = JavaPsiFacade.getInstance(method.getProject()).getResolveHelper(); |
| for (final PsiTypeParameter parameter : method.getTypeParameters()) { |
| PsiType returnType = method.getReturnType(); |
| if (substitutor != null) { |
| returnType = substitutor.substitute(returnType); |
| } |
| final PsiType substitutionForParameter = helper.getSubstitutionForTypeParameter(parameter, |
| returnType, |
| expectedType, |
| false, |
| PsiUtil.getLanguageLevel(place)); |
| if (substitutionForParameter != PsiType.NULL && !(substitutionForParameter instanceof PsiIntersectionType)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| public String toString(){ |
| return "assignable-from(" + (myType != null ? myType : myClassName) + ")"; |
| } |
| } |