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.DeclarationDescriptor;
022    import org.jetbrains.jet.lang.psi.JetSimpleNameExpression;
023    import org.jetbrains.k2js.translate.context.TemporaryVariable;
024    import org.jetbrains.k2js.translate.context.TranslationContext;
025    import org.jetbrains.k2js.translate.general.AbstractTranslator;
026    import org.jetbrains.k2js.translate.utils.JsAstUtils;
027    
028    import java.util.Collections;
029    import java.util.List;
030    
031    import static org.jetbrains.k2js.translate.reference.ReferenceTranslator.translateAsLocalNameReference;
032    import static org.jetbrains.k2js.translate.utils.BindingUtils.getDescriptorForReferenceExpression;
033    
034    public final class ReferenceAccessTranslator extends AbstractTranslator implements CachedAccessTranslator {
035    
036        @NotNull
037        /*package*/ static ReferenceAccessTranslator newInstance(@NotNull JetSimpleNameExpression expression,
038                                                                 @NotNull TranslationContext context) {
039            DeclarationDescriptor referenceDescriptor = getDescriptorForReferenceExpression(context.bindingContext(), expression);
040            assert referenceDescriptor != null : "JetSimpleName expression must reference a descriptor " + expression.getText();
041            return new ReferenceAccessTranslator(referenceDescriptor, context);
042        }
043    
044        @NotNull
045        private final JsExpression reference;
046    
047        private ReferenceAccessTranslator(@NotNull DeclarationDescriptor descriptor, @NotNull TranslationContext context) {
048            super(context);
049            this.reference = translateAsLocalNameReference(descriptor, context());
050        }
051    
052        @Override
053        @NotNull
054        public JsExpression translateAsGet() {
055            return reference;
056        }
057    
058        @Override
059        @NotNull
060        public JsExpression translateAsSet(@NotNull JsExpression toSetTo) {
061            return JsAstUtils.assignment(reference, toSetTo);
062        }
063    
064        @NotNull
065        @Override
066        public CachedAccessTranslator getCached() {
067            return this;
068        }
069    
070        @NotNull
071        @Override
072        public List<TemporaryVariable> declaredTemporaries() {
073            return Collections.emptyList();
074        }
075    }