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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.openapi.diagnostic.Logger;
import com.intellij.psi.*;
import com.intellij.psi.impl.JavaConstantExpressionEvaluator;
import gnu.trove.TIntObjectHashMap;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
public class DfaValueFactory {
private static final Logger LOG = Logger.getInstance("#com.intellij.codeInspection.dataFlow.value.DfaValueFactory");
private int myLastID;
private final TIntObjectHashMap<DfaValue> myValues;
public DfaValueFactory() {
myValues = new TIntObjectHashMap<DfaValue>();
myLastID = 0;
myVarFactory = new DfaVariableValue.Factory(this);
myConstFactory = new DfaConstValue.Factory(this);
myBoxedFactory = new DfaBoxedValue.Factory(this);
myNotNullFactory = new DfaNotNullValue.Factory(this);
myTypeFactory = new DfaTypeValue.Factory(this);
myRelationFactory = new DfaRelationValue.Factory(this);
}
public DfaValue createTypeValueWithNullability(@Nullable PsiType type, @Nullable Boolean nullability) {
return nullability == Boolean.FALSE ? getNotNullFactory().create(type) : getTypeFactory().create(type, nullability == Boolean.TRUE);
}
int createID() {
myLastID++;
LOG.assertTrue(myLastID >= 0, "Overflow");
return myLastID;
}
void registerValue(DfaValue value) {
myValues.put(value.getID(), value);
}
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 getNotNullFactory().create(psiExpression.getType());
}
final Object value = JavaConstantExpressionEvaluator.computeConstantExpression(psiExpression, false);
PsiType type = psiExpression.getType();
if (value != null && type != null) {
if (value instanceof String) {
return getNotNullFactory().create(type); // Non-null string literal.
}
return getConstFactory().createFromValue(value, type);
}
return null;
}
@Nullable
public DfaValue createLiteralValue(PsiLiteralExpression literal) {
if (literal.getValue() instanceof String) {
return getNotNullFactory().create(literal.getType()); // Non-null string literal.
}
return getConstFactory().create(literal);
}
private static boolean isNotNullExpression(PsiExpression initializer, PsiType type) {
if (initializer instanceof PsiNewExpression) {
return true;
}
if (initializer instanceof PsiPolyadicExpression) {
if (type != null && type.equalsToText(CommonClassNames.JAVA_LANG_STRING)) {
return true;
}
}
return false;
}
@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;
PsiExpression initializer = variable.getInitializer();
PsiType type = initializer == null ? null : initializer.getType();
if (initializer != null && type != null && isNotNullExpression(initializer, type)) {
return getNotNullFactory().create(type);
}
}
if (isEffectivelyUnqualified(referenceExpression)) {
return getVarFactory().createVariableValue(variable, referenceExpression.getType(), false, null, false);
}
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;
}
private static boolean isEffectivelyUnqualified(PsiReferenceExpression refExpression) {
PsiExpression qualifier = refExpression.getQualifierExpression();
return qualifier == null || qualifier instanceof PsiThisExpression;
}
private final DfaVariableValue.Factory myVarFactory;
private final DfaConstValue.Factory myConstFactory;
private final DfaBoxedValue.Factory myBoxedFactory;
private final DfaNotNullValue.Factory myNotNullFactory;
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 DfaNotNullValue.Factory getNotNullFactory() {
return myNotNullFactory;
}
@NotNull
public DfaTypeValue.Factory getTypeFactory() {
return myTypeFactory;
}
@NotNull
public DfaRelationValue.Factory getRelationFactory() {
return myRelationFactory;
}
}
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