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/*
* Copyright 2000-2012 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.impl.source.resolve;
import com.intellij.openapi.util.Computable;
import com.intellij.openapi.util.Pair;
import com.intellij.psi.*;
import com.intellij.psi.infos.MethodCandidateInfo;
import com.intellij.psi.scope.MethodProcessorSetupFailedException;
import com.intellij.psi.scope.processor.MethodCandidatesProcessor;
import com.intellij.psi.scope.util.PsiScopesUtil;
import com.intellij.psi.util.PsiUtil;
import com.intellij.util.ArrayUtilRt;
import org.jetbrains.annotations.NotNull;
import java.util.Arrays;
import java.util.List;
/**
* User: anna
* Date: 7/18/12
*/
public class ProcessCandidateParameterTypeInferencePolicy extends DefaultParameterTypeInferencePolicy {
public static final ProcessCandidateParameterTypeInferencePolicy INSTANCE = new ProcessCandidateParameterTypeInferencePolicy();
@Override
public Pair<PsiType, ConstraintType> inferTypeConstraintFromCallContext(PsiExpression innerMethodCall,
PsiExpressionList expressionList,
@NotNull PsiCallExpression contextCall,
PsiTypeParameter typeParameter) {
PsiExpression[] expressions = expressionList.getExpressions();
PsiElement parent = innerMethodCall;
while (parent.getParent() instanceof PsiParenthesizedExpression) {
parent = parent.getParent();
}
int i = ArrayUtilRt.find(expressions, parent);
if (i < 0) return null;
PsiMethod owner = (PsiMethod)typeParameter.getOwner();
if (owner == null) return null;
try {
final JavaResolveResult[] results = getResults(contextCall, i);
final PsiType innerReturnType = owner.getReturnType();
for (final JavaResolveResult result : results) {
if (result == null) continue;
final PsiSubstitutor substitutor = getSubstitutor(contextCall, expressions, i, result);
final Pair<PsiType, ConstraintType> constraint = inferConstraint(typeParameter, innerMethodCall, i, innerReturnType, result, substitutor);
if (constraint != null) return constraint;
}
}
catch (MethodProcessorSetupFailedException ev) {
return null;
}
return null;
}
protected PsiSubstitutor getSubstitutor(PsiCallExpression contextCall, PsiExpression[] expressions, int i, JavaResolveResult result) {
if (result instanceof MethodCandidateInfo) {
List<PsiExpression> leftArgs = getExpressions(expressions, i);
return ((MethodCandidateInfo)result).inferSubstitutorFromArgs(this, leftArgs.toArray(new PsiExpression[leftArgs.size()]));
}
else {
return result.getSubstitutor();
}
}
protected List<PsiExpression> getExpressions(PsiExpression[] expressions, int i) {
return Arrays.asList(expressions).subList(0, i);
}
protected static Pair<PsiType, ConstraintType> inferConstraint(PsiTypeParameter typeParameter,
PsiExpression innerMethodCall,
int parameterIdx,
PsiType innerReturnType,
JavaResolveResult result,
final PsiSubstitutor substitutor) {
final PsiElement element = result.getElement();
if (element instanceof PsiMethod) {
final PsiMethod method = (PsiMethod)element;
final PsiParameter[] parameters = method.getParameterList().getParameters();
PsiParameter parameter = null;
if (parameters.length > parameterIdx) {
parameter = parameters[parameterIdx];
}
else if (method.isVarArgs()) {
parameter = parameters[parameters.length - 1];
}
if (parameter != null) {
final PsiParameter finalParameter = parameter;
PsiType type = PsiResolveHelper.ourGuard.doPreventingRecursion(innerMethodCall, true, new Computable<PsiType>() {
@Override
public PsiType compute() {
return substitutor.substitute(finalParameter.getType());
}
});
PsiResolveHelperImpl resolveHelper = (PsiResolveHelperImpl)JavaPsiFacade.getInstance(method.getProject()).getResolveHelper();
final Pair<PsiType, ConstraintType> constraint =
resolveHelper.getSubstitutionForTypeParameterConstraint(typeParameter, innerReturnType, type, false,
PsiUtil.getLanguageLevel(finalParameter));
if (constraint != null) return constraint;
}
}
return null;
}
@NotNull
protected JavaResolveResult[] getResults(@NotNull PsiCallExpression contextCall, final int exprIdx) throws MethodProcessorSetupFailedException {
PsiFile containingFile = contextCall.getContainingFile();
final MethodCandidatesProcessor processor = new MethodCandidatesProcessor(contextCall, containingFile);
//can't call resolve() since it obtains full substitution, that may result in infinite recursion
PsiScopesUtil.setupAndRunProcessor(processor, contextCall, false);
return processor.getResult();
}
}
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