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.k2js.translate.reference.ReferenceTranslator.translateAsFQReference;
035    import static org.jetbrains.k2js.translate.utils.BindingUtils.getDescriptorForReferenceExpression;
036    
037    public class ClassObjectAccessTranslator extends AbstractTranslator implements CachedAccessTranslator {
038        @NotNull
039        /*package*/ static ClassObjectAccessTranslator newInstance(@NotNull JetSimpleNameExpression expression,
040                @NotNull TranslationContext context) {
041            DeclarationDescriptor referenceDescriptor = getDescriptorForReferenceExpression(context.bindingContext(), expression);
042            assert referenceDescriptor != null : "JetSimpleName expression must reference a descriptor " + expression.getText();
043            return new ClassObjectAccessTranslator(referenceDescriptor, context);
044        }
045    
046        /*package*/ static boolean isClassObjectReference(@NotNull JetReferenceExpression expression,
047                @NotNull TranslationContext context) {
048            DeclarationDescriptor descriptor = getDescriptorForReferenceExpression(context.bindingContext(), expression);
049            return descriptor instanceof ClassDescriptor && !AnnotationsUtils.isNativeObject(descriptor);
050        }
051    
052        @NotNull
053        private final JsExpression referenceToClassObject;
054    
055        private ClassObjectAccessTranslator(@NotNull DeclarationDescriptor descriptor, @NotNull TranslationContext context) {
056            super(context);
057            this.referenceToClassObject = Namer.getClassObjectAccessor(translateAsFQReference(descriptor, context()));
058        }
059    
060        @Override
061        @NotNull
062        public JsExpression translateAsGet() {
063            return referenceToClassObject;
064        }
065    
066        @Override
067        @NotNull
068        public JsExpression translateAsSet(@NotNull JsExpression toSetTo) {
069            throw new IllegalStateException("Class object can't set");
070        }
071    
072        @NotNull
073        @Override
074        public CachedAccessTranslator getCached() {
075            return this;
076        }
077    
078        @NotNull
079        @Override
080        public List<TemporaryVariable> declaredTemporaries() {
081            return Collections.emptyList();
082        }
083    }