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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.daemon.impl.quickfix;
import com.intellij.codeInsight.daemon.impl.HighlightInfo;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.util.Comparing;
import com.intellij.openapi.util.TextRange;
import com.intellij.psi.*;
import com.intellij.psi.infos.CandidateInfo;
import com.intellij.util.IncorrectOperationException;
import gnu.trove.THashSet;
import org.jetbrains.annotations.Nullable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;
/**
* @author ven
*/
public abstract class ArgumentFixerActionFactory {
private static final Logger LOG = Logger.getInstance("#com.intellij.codeInsight.daemon.impl.quickfix.ArgumentFixerActionFactory");
@Nullable
protected abstract PsiExpression getModifiedArgument(PsiExpression expression, final PsiType toType) throws IncorrectOperationException;
public void registerCastActions(CandidateInfo[] candidates, PsiCall call, HighlightInfo highlightInfo, final TextRange fixRange) {
if (candidates.length == 0) return;
List<CandidateInfo> methodCandidates = new ArrayList<CandidateInfo>(Arrays.asList(candidates));
PsiExpressionList list = call.getArgumentList();
PsiExpression[] expressions = list.getExpressions();
if (expressions.length == 0) return;
// filter out not castable candidates
nextMethod:
for (int i = methodCandidates.size() - 1; i >= 0; i--) {
CandidateInfo candidate = methodCandidates.get(i);
PsiMethod method = (PsiMethod) candidate.getElement();
PsiSubstitutor substitutor = candidate.getSubstitutor();
assert method != null;
PsiParameter[] parameters = method.getParameterList().getParameters();
if (expressions.length != parameters.length) {
methodCandidates.remove(i);
continue;
}
for (int j = 0; j < parameters.length; j++) {
PsiParameter parameter = parameters[j];
PsiExpression expression = expressions[j];
// check if we can cast to this method
PsiType exprType = expression.getType();
PsiType parameterType = substitutor.substitute(parameter.getType());
if (exprType == null
|| parameterType == null
|| !areTypesConvertible(exprType, parameterType, call)) {
methodCandidates.remove(i);
continue nextMethod;
}
}
}
if (methodCandidates.isEmpty()) return;
try {
for (int i = 0; i < expressions.length; i++) {
PsiExpression expression = expressions[i];
PsiType exprType = expression.getType();
Set<String> suggestedCasts = new THashSet<String>();
// find to which type we can cast this param to get valid method call
for (CandidateInfo candidate : methodCandidates) {
PsiMethod method = (PsiMethod)candidate.getElement();
PsiSubstitutor substitutor = candidate.getSubstitutor();
assert method != null;
PsiParameter[] parameters = method.getParameterList().getParameters();
PsiType originalParameterType = parameters[i].getType();
PsiType parameterType = substitutor.substitute(originalParameterType);
if (parameterType instanceof PsiWildcardType) continue;
if (!GenericsUtil.isFromExternalTypeLanguage(parameterType)) continue;
if (suggestedCasts.contains(parameterType.getCanonicalText())) continue;
// strict compare since even widening cast may help
if (Comparing.equal(exprType, parameterType)) continue;
PsiCall newCall = (PsiCall) call.copy();
PsiExpression modifiedExpression = getModifiedArgument(expression, parameterType);
if (modifiedExpression == null) continue;
newCall.getArgumentList().getExpressions()[i].replace(modifiedExpression);
JavaResolveResult resolveResult = newCall.resolveMethodGenerics();
if (resolveResult.getElement() != null && resolveResult.isValidResult()) {
suggestedCasts.add(parameterType.getCanonicalText());
QuickFixAction.registerQuickFixAction(highlightInfo, fixRange, createFix(list, i, parameterType));
}
}
}
}
catch (IncorrectOperationException e) {
LOG.error(e);
}
}
public abstract boolean areTypesConvertible(final PsiType exprType, final PsiType parameterType, final PsiElement context);
public abstract MethodArgumentFix createFix(final PsiExpressionList list, final int i, final PsiType parameterType);
}
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