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/*
* Copyright 2000-2013 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.
*/
/*
* @author max
*/
package com.intellij.psi.impl.source.resolve;
import com.intellij.openapi.components.ServiceManager;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.Key;
import com.intellij.openapi.util.NotNullLazyKey;
import com.intellij.openapi.util.RecursionGuard;
import com.intellij.psi.*;
import com.intellij.psi.impl.AnyPsiChangeListener;
import com.intellij.psi.impl.PsiManagerImpl;
import com.intellij.psi.impl.source.PsiClassReferenceType;
import com.intellij.psi.impl.source.PsiImmediateClassType;
import com.intellij.psi.infos.MethodCandidateInfo;
import com.intellij.psi.util.TypeConversionUtil;
import com.intellij.reference.SoftReference;
import com.intellij.util.Function;
import com.intellij.util.containers.ConcurrentWeakHashMap;
import com.intellij.util.messages.MessageBus;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.lang.ref.Reference;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentMap;
public class JavaResolveCache {
private static final Logger LOG = Logger.getInstance("#com.intellij.psi.impl.source.resolve.JavaResolveCache");
private static final NotNullLazyKey<JavaResolveCache, Project> INSTANCE_KEY = ServiceManager.createLazyKey(JavaResolveCache.class);
public static JavaResolveCache getInstance(Project project) {
return INSTANCE_KEY.getValue(project);
}
private final ConcurrentMap<PsiExpression, Reference<PsiType>> myCalculatedTypes = new ConcurrentWeakHashMap<PsiExpression, Reference<PsiType>>();
private final Map<PsiVariable,Object> myVarToConstValueMapPhysical = new ConcurrentWeakHashMap<PsiVariable, Object>();
private final Map<PsiVariable,Object> myVarToConstValueMapNonPhysical = new ConcurrentWeakHashMap<PsiVariable, Object>();
private static final Object NULL = Key.create("NULL");
public JavaResolveCache(@Nullable("can be null in com.intellij.core.JavaCoreApplicationEnvironment.JavaCoreApplicationEnvironment") MessageBus messageBus) {
if (messageBus != null) {
messageBus.connect().subscribe(PsiManagerImpl.ANY_PSI_CHANGE_TOPIC, new AnyPsiChangeListener() {
@Override
public void beforePsiChanged(boolean isPhysical) {
clearCaches(isPhysical);
}
@Override
public void afterPsiChanged(boolean isPhysical) {
}
});
}
}
private void clearCaches(boolean isPhysical) {
myCalculatedTypes.clear();
if (isPhysical) {
myVarToConstValueMapPhysical.clear();
}
myVarToConstValueMapNonPhysical.clear();
}
@Nullable
public <T extends PsiExpression> PsiType getType(@NotNull T expr, @NotNull Function<T, PsiType> f) {
PsiType type = getCachedType(expr);
if (type == null) {
final RecursionGuard.StackStamp dStackStamp = PsiDiamondType.ourDiamondGuard.markStack();
final RecursionGuard.StackStamp gStackStamp = PsiResolveHelper.ourGraphGuard.markStack();
type = f.fun(expr);
if (!dStackStamp.mayCacheNow() || !gStackStamp.mayCacheNow() || !MethodCandidateInfo.ourOverloadGuard.currentStack().isEmpty()) {
return type;
}
if (type == null) type = TypeConversionUtil.NULL_TYPE;
Reference<PsiType> ref = new SoftReference<PsiType>(type);
myCalculatedTypes.put(expr, ref);
if (type instanceof PsiClassReferenceType) {
// convert reference-based class type to the PsiImmediateClassType, since the reference may become invalid
PsiClassType.ClassResolveResult result = ((PsiClassReferenceType)type).resolveGenerics();
PsiClass psiClass = result.getElement();
type = psiClass == null
? type // for type with unresolved reference, leave it in the cache
// for clients still might be able to retrieve its getCanonicalText() from the reference text
: new PsiImmediateClassType(psiClass, result.getSubstitutor(), ((PsiClassReferenceType)type).getLanguageLevel(), type.getAnnotations());
}
}
if (!type.isValid()) {
if (expr.isValid()) {
PsiJavaCodeReferenceElement refInside = type instanceof PsiClassReferenceType ? ((PsiClassReferenceType)type).getReference() : null;
@NonNls String typeinfo = type + " (" + type.getClass() + ")" + (refInside == null ? "" : "; ref inside: "+refInside + " ("+refInside.getClass()+") valid:"+refInside.isValid());
LOG.error("Type is invalid: " + typeinfo + "; expr: '" + expr + "' (" + expr.getClass() + ") is valid");
}
else {
LOG.error("Expression: '"+expr+"' is invalid, must not be used for getType()");
}
}
return type == TypeConversionUtil.NULL_TYPE ? null : type;
}
private <T extends PsiExpression> PsiType getCachedType(T expr) {
Reference<PsiType> reference = myCalculatedTypes.get(expr);
return SoftReference.dereference(reference);
}
@Nullable
public Object computeConstantValueWithCaching(@NotNull PsiVariable variable, @NotNull ConstValueComputer computer, Set<PsiVariable> visitedVars){
boolean physical = variable.isPhysical();
Map<PsiVariable, Object> map = physical ? myVarToConstValueMapPhysical : myVarToConstValueMapNonPhysical;
Object cached = map.get(variable);
if (cached == NULL) return null;
if (cached != null) return cached;
Object result = computer.execute(variable, visitedVars);
map.put(variable, result == null ? NULL : result);
return result;
}
public interface ConstValueComputer{
Object execute(PsiVariable variable, Set<PsiVariable> visitedVars);
}
}
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