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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.
*/
/*
* Created by IntelliJ IDEA.
* User: max
* Date: Feb 7, 2002
* Time: 2:33:28 PM
* To change template for new class use
* Code Style | Class Templates options (Tools | IDE Options).
*/
package com.intellij.codeInspection.dataFlow.value;
import com.intellij.codeInspection.dataFlow.Nullness;
import com.intellij.openapi.util.Pair;
import com.intellij.psi.*;
import com.intellij.psi.impl.JavaConstantExpressionEvaluator;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.psi.util.TypeConversionUtil;
import com.intellij.util.containers.ContainerUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.List;
import java.util.Map;
public class DfaValueFactory {
private final List<DfaValue> myValues = ContainerUtil.newArrayList();
private final Map<Pair<DfaPsiType, DfaPsiType>, Boolean> myAssignableCache = ContainerUtil.newHashMap();
private final Map<Pair<DfaPsiType, DfaPsiType>, Boolean> myConvertibleCache = ContainerUtil.newHashMap();
private final Map<PsiType, DfaPsiType> myDfaTypes = ContainerUtil.newHashMap();
private final boolean myHonorFieldInitializers;
public DfaValueFactory(boolean honorFieldInitializers) {
myHonorFieldInitializers = honorFieldInitializers;
myValues.add(null);
myVarFactory = new DfaVariableValue.Factory(this);
myConstFactory = new DfaConstValue.Factory(this);
myBoxedFactory = new DfaBoxedValue.Factory(this);
myTypeFactory = new DfaTypeValue.Factory(this);
myRelationFactory = new DfaRelationValue.Factory(this);
}
public boolean isHonorFieldInitializers() {
return myHonorFieldInitializers;
}
public DfaValue createTypeValue(@Nullable PsiType type, Nullness nullability) {
type = TypeConversionUtil.erasure(type);
if (type == null) return DfaUnknownValue.getInstance();
return getTypeFactory().createTypeValue(internType(type), nullability);
}
private DfaPsiType internType(@NotNull PsiType psiType) {
DfaPsiType dfaType = myDfaTypes.get(psiType);
if (dfaType == null) {
myDfaTypes.put(psiType, dfaType = new DfaPsiType(psiType, myAssignableCache, myConvertibleCache));
}
return dfaType;
}
int registerValue(DfaValue value) {
myValues.add(value);
return myValues.size() - 1;
}
public DfaValue getValue(int id) {
return myValues.get(id);
}
@Nullable
public DfaValue createValue(PsiExpression psiExpression) {
if (psiExpression instanceof PsiReferenceExpression) {
return createReferenceValue((PsiReferenceExpression)psiExpression);
}
if (psiExpression instanceof PsiLiteralExpression) {
return createLiteralValue((PsiLiteralExpression)psiExpression);
}
if (psiExpression instanceof PsiNewExpression) {
return createTypeValue(psiExpression.getType(), Nullness.NOT_NULL);
}
final Object value = JavaConstantExpressionEvaluator.computeConstantExpression(psiExpression, false);
PsiType type = psiExpression.getType();
if (value != null && type != null) {
if (value instanceof String) {
return createTypeValue(type, Nullness.NOT_NULL); // Non-null string literal.
}
return getConstFactory().createFromValue(value, type, null);
}
return null;
}
@Nullable
public DfaValue createLiteralValue(PsiLiteralExpression literal) {
if (literal.getValue() instanceof String) {
return createTypeValue(literal.getType(), Nullness.NOT_NULL); // Non-null string literal.
}
return getConstFactory().create(literal);
}
@Nullable
public DfaValue createReferenceValue(PsiReferenceExpression referenceExpression) {
PsiElement psiSource = referenceExpression.resolve();
if (!(psiSource instanceof PsiVariable)) {
return null;
}
final PsiVariable variable = (PsiVariable)psiSource;
if (variable.hasModifierProperty(PsiModifier.FINAL) && !variable.hasModifierProperty(PsiModifier.TRANSIENT)) {
DfaValue constValue = getConstFactory().create(variable);
if (constValue != null) return constValue;
}
if (!variable.hasModifierProperty(PsiModifier.VOLATILE) && isEffectivelyUnqualified(referenceExpression)) {
return getVarFactory().createVariableValue(variable, referenceExpression.getType(), false, null);
}
return null;
}
@Nullable
public static PsiVariable resolveUnqualifiedVariable(PsiReferenceExpression refExpression) {
if (isEffectivelyUnqualified(refExpression)) {
PsiElement resolved = refExpression.resolve();
if (resolved instanceof PsiVariable) {
return (PsiVariable)resolved;
}
}
return null;
}
public static boolean isEffectivelyUnqualified(PsiReferenceExpression refExpression) {
PsiExpression qualifier = refExpression.getQualifierExpression();
if (qualifier == null) {
return true;
}
if (qualifier instanceof PsiThisExpression || qualifier instanceof PsiSuperExpression) {
final PsiJavaCodeReferenceElement thisQualifier = ((PsiQualifiedExpression)qualifier).getQualifier();
if (thisQualifier == null) return true;
final PsiClass innerMostClass = PsiTreeUtil.getParentOfType(refExpression, PsiClass.class);
if (innerMostClass == thisQualifier.resolve()) {
return true;
}
}
return false;
}
private final DfaVariableValue.Factory myVarFactory;
private final DfaConstValue.Factory myConstFactory;
private final DfaBoxedValue.Factory myBoxedFactory;
private final DfaTypeValue.Factory myTypeFactory;
private final DfaRelationValue.Factory myRelationFactory;
@NotNull
public DfaVariableValue.Factory getVarFactory() {
return myVarFactory;
}
@NotNull
public DfaConstValue.Factory getConstFactory() {
return myConstFactory;
}
@NotNull
public DfaBoxedValue.Factory getBoxedFactory() {
return myBoxedFactory;
}
@NotNull
public DfaTypeValue.Factory getTypeFactory() {
return myTypeFactory;
}
@NotNull
public DfaRelationValue.Factory getRelationFactory() {
return myRelationFactory;
}
}
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