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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 3, 2002
* Time: 9:49:29 PM
* To change template for new class use
* Code Style | Class Templates options (Tools | IDE Options).
*/
package com.intellij.codeInspection.dataFlow;
import com.intellij.codeInspection.dataFlow.value.DfaPsiType;
import com.intellij.codeInspection.dataFlow.value.DfaTypeValue;
import com.intellij.codeInspection.dataFlow.value.DfaValue;
import com.intellij.codeInspection.dataFlow.value.DfaVariableValue;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.PsiPrimitiveType;
import com.intellij.util.containers.ContainerUtil;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
public class DfaVariableState {
protected final Set<DfaPsiType> myInstanceofValues;
protected final Set<DfaPsiType> myNotInstanceofValues;
protected final Nullness myNullability;
public DfaVariableState(@NotNull DfaVariableValue dfaVar) {
this(Collections.<DfaPsiType>emptySet(), Collections.<DfaPsiType>emptySet(), dfaVar.getInherentNullability());
}
protected DfaVariableState(Set<DfaPsiType> instanceofValues,
Set<DfaPsiType> notInstanceofValues, Nullness nullability) {
myInstanceofValues = instanceofValues;
myNotInstanceofValues = notInstanceofValues;
myNullability = nullability;
}
public boolean isNullable() {
return myNullability == Nullness.NULLABLE;
}
private boolean checkInstanceofValue(DfaPsiType dfaType) {
if (myInstanceofValues.contains(dfaType)) return true;
for (DfaPsiType dfaTypeValue : myNotInstanceofValues) {
if (dfaTypeValue.isAssignableFrom(dfaType)) return false;
}
for (DfaPsiType dfaTypeValue : myInstanceofValues) {
if (!dfaType.isConvertibleFrom(dfaTypeValue)) return false;
}
return true;
}
@Nullable
public DfaVariableState withInstanceofValue(DfaTypeValue dfaType) {
if (dfaType.getDfaType().getPsiType() instanceof PsiPrimitiveType) return this;
if (checkInstanceofValue(dfaType.getDfaType())) {
DfaVariableState result = dfaType.isNullable() ? withNullability(Nullness.NULLABLE) : this;
if (!myInstanceofValues.contains(dfaType.getDfaType())) {
HashSet<DfaPsiType> newInstanceof = ContainerUtil.newHashSet(myInstanceofValues);
newInstanceof.add(dfaType.getDfaType());
result = createCopy(newInstanceof, myNotInstanceofValues, result.myNullability);
}
return result;
}
return null;
}
@Nullable
public DfaVariableState withNotInstanceofValue(DfaTypeValue dfaType) {
if (myNotInstanceofValues.contains(dfaType.getDfaType())) return this;
for (DfaPsiType dfaTypeValue : myInstanceofValues) {
if (dfaType.getDfaType().isAssignableFrom(dfaTypeValue)) return null;
}
HashSet<DfaPsiType> newNotInstanceof = ContainerUtil.newHashSet(myNotInstanceofValues);
newNotInstanceof.add(dfaType.getDfaType());
return createCopy(myInstanceofValues, newNotInstanceof, myNullability);
}
DfaVariableState withoutType(DfaPsiType type) {
if (myInstanceofValues.contains(type)) {
HashSet<DfaPsiType> newInstanceof = ContainerUtil.newHashSet(myInstanceofValues);
newInstanceof.remove(type);
return createCopy(newInstanceof, myNotInstanceofValues, myNullability);
}
if (myNotInstanceofValues.contains(type)) {
HashSet<DfaPsiType> newNotInstanceof = ContainerUtil.newHashSet(myNotInstanceofValues);
newNotInstanceof.remove(type);
return createCopy(myInstanceofValues, newNotInstanceof, myNullability);
}
return this;
}
public int hashCode() {
return (myInstanceofValues.hashCode() * 31 + myNotInstanceofValues.hashCode()) * 31 + myNullability.hashCode();
}
public boolean equals(Object obj) {
if (obj == this) return true;
if (!(obj instanceof DfaVariableState)) return false;
DfaVariableState aState = (DfaVariableState) obj;
return myNullability == aState.myNullability &&
myInstanceofValues.equals(aState.myInstanceofValues) &&
myNotInstanceofValues.equals(aState.myNotInstanceofValues);
}
protected DfaVariableState createCopy(Set<DfaPsiType> instanceofValues, Set<DfaPsiType> notInstanceofValues, Nullness nullability) {
return new DfaVariableState(instanceofValues, notInstanceofValues, nullability);
}
public String toString() {
@NonNls StringBuilder buf = new StringBuilder();
buf.append(myNullability);
if (!myInstanceofValues.isEmpty()) {
buf.append(" instanceof ").append(StringUtil.join(myInstanceofValues, ","));
}
if (!myNotInstanceofValues.isEmpty()) {
buf.append(" not instanceof ").append(StringUtil.join(myNotInstanceofValues, ","));
}
return buf.toString();
}
public Nullness getNullability() {
return myNullability;
}
public boolean isNotNull() {
return myNullability == Nullness.NOT_NULL;
}
DfaVariableState withNullability(@NotNull Nullness nullness) {
return myNullability == nullness ? this : createCopy(myInstanceofValues, myNotInstanceofValues, nullness);
}
public DfaVariableState withNullable(final boolean nullable) {
return myNullability != Nullness.NOT_NULL ? withNullability(nullable ? Nullness.NULLABLE : Nullness.UNKNOWN) : this;
}
public DfaVariableState withValue(DfaValue value) {
return this;
}
@Nullable
public DfaValue getValue() {
return null;
}
public Set<DfaPsiType> getInstanceofValues() {
return myInstanceofValues;
}
public Set<DfaPsiType> getNotInstanceofValues() {
return myNotInstanceofValues;
}
}
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