001    /*
002     * Copyright 2010-2013 JetBrains s.r.o.
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    package org.jetbrains.k2js.translate.reference;
018    
019    import com.google.dart.compiler.backend.js.ast.JsExpression;
020    import org.jetbrains.annotations.NotNull;
021    import org.jetbrains.jet.lang.descriptors.ClassDescriptor;
022    import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
023    import org.jetbrains.jet.lang.psi.JetReferenceExpression;
024    import org.jetbrains.jet.lang.psi.JetSimpleNameExpression;
025    import org.jetbrains.k2js.translate.context.Namer;
026    import org.jetbrains.k2js.translate.context.TemporaryVariable;
027    import org.jetbrains.k2js.translate.context.TranslationContext;
028    import org.jetbrains.k2js.translate.general.AbstractTranslator;
029    import org.jetbrains.k2js.translate.utils.AnnotationsUtils;
030    
031    import java.util.Collections;
032    import java.util.List;
033    
034    import static org.jetbrains.jet.lang.resolve.DescriptorUtils.isEnumEntry;
035    import static org.jetbrains.jet.lang.resolve.DescriptorUtils.isObject;
036    import static org.jetbrains.k2js.translate.reference.ReferenceTranslator.translateAsFQReference;
037    import static org.jetbrains.k2js.translate.utils.BindingUtils.getDescriptorForReferenceExpression;
038    
039    public class ClassObjectAccessTranslator extends AbstractTranslator implements CachedAccessTranslator {
040        @NotNull
041        /*package*/ static ClassObjectAccessTranslator newInstance(@NotNull JetSimpleNameExpression expression,
042                @NotNull TranslationContext context) {
043            DeclarationDescriptor referenceDescriptor = getDescriptorForReferenceExpression(context.bindingContext(), expression);
044            assert referenceDescriptor != null : "JetSimpleName expression must reference a descriptor " + expression.getText();
045            return new ClassObjectAccessTranslator(referenceDescriptor, context);
046        }
047    
048        /*package*/ static boolean isClassObjectReference(@NotNull JetReferenceExpression expression,
049                @NotNull TranslationContext context) {
050            DeclarationDescriptor descriptor = getDescriptorForReferenceExpression(context.bindingContext(), expression);
051            return descriptor instanceof ClassDescriptor && !AnnotationsUtils.isNativeObject(descriptor);
052        }
053    
054        @NotNull
055        private final JsExpression referenceToClassObject;
056    
057        private ClassObjectAccessTranslator(@NotNull DeclarationDescriptor descriptor, @NotNull TranslationContext context) {
058            super(context);
059            JsExpression fqReference = translateAsFQReference(descriptor, context());
060            if (isObject(descriptor) || isEnumEntry(descriptor)) {
061                this.referenceToClassObject = fqReference;
062            }
063            else {
064                this.referenceToClassObject = Namer.getClassObjectAccessor(fqReference);
065            }
066        }
067    
068        @Override
069        @NotNull
070        public JsExpression translateAsGet() {
071            return referenceToClassObject;
072        }
073    
074        @Override
075        @NotNull
076        public JsExpression translateAsSet(@NotNull JsExpression toSetTo) {
077            throw new IllegalStateException("Class object can't set");
078        }
079    
080        @NotNull
081        @Override
082        public CachedAccessTranslator getCached() {
083            return this;
084        }
085    
086        @NotNull
087        @Override
088        public List<TemporaryVariable> declaredTemporaries() {
089            return Collections.emptyList();
090        }
091    }