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
017package org.jetbrains.k2js.translate.reference;
018
019import com.google.dart.compiler.backend.js.ast.JsExpression;
020import com.google.dart.compiler.backend.js.ast.JsName;
021import com.google.dart.compiler.backend.js.ast.JsNameRef;
022import org.jetbrains.annotations.NotNull;
023import org.jetbrains.annotations.Nullable;
024import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
025import org.jetbrains.jet.lang.descriptors.PropertyDescriptor;
026import org.jetbrains.k2js.translate.context.TranslationContext;
027
028import static org.jetbrains.k2js.translate.utils.JsAstUtils.assignment;
029import static org.jetbrains.k2js.translate.utils.JsDescriptorUtils.getExpectedThisDescriptor;
030
031/**
032 * For native apis that use .property notation for access.
033 */
034public final class NativePropertyAccessTranslator extends PropertyAccessTranslator {
035
036    @Nullable
037    private final JsExpression receiver;
038    @NotNull
039    private final PropertyDescriptor propertyDescriptor;
040
041    /*package*/
042    NativePropertyAccessTranslator(@NotNull PropertyDescriptor descriptor,
043            @Nullable JsExpression receiver,
044            @NotNull TranslationContext context) {
045        super(context);
046        this.receiver = receiver;
047        this.propertyDescriptor = descriptor.getOriginal();
048    }
049
050    @Override
051    @NotNull
052    public JsExpression translateAsGet() {
053        return translateAsGet(getReceiver());
054    }
055
056    @NotNull
057    @Override
058    protected JsExpression translateAsGet(@Nullable JsExpression receiver) {
059        return getCallType().constructCall(receiver, new CallType.CallConstructor() {
060            @NotNull
061            @Override
062            public JsExpression construct(@Nullable JsExpression receiver) {
063                return doTranslateAsGet(receiver);
064            }
065        }, context());
066    }
067
068    @NotNull
069    private JsExpression doTranslateAsGet(JsExpression receiver) {
070        JsName nativePropertyName = context().getNameForDescriptor(propertyDescriptor);
071        if (receiver != null) {
072            return new JsNameRef(nativePropertyName, receiver);
073        }
074        else {
075            return nativePropertyName.makeRef();
076        }
077    }
078
079    @Override
080    @NotNull
081    protected JsExpression translateAsSet(@Nullable JsExpression receiver, @NotNull final JsExpression setTo) {
082        assert receiver != null;
083        return getCallType().constructCall(receiver, new CallType.CallConstructor() {
084            @NotNull
085            @Override
086            public JsExpression construct(@Nullable JsExpression receiver) {
087                return assignment(translateAsGet(receiver), setTo);
088            }
089        }, context());
090    }
091
092    @NotNull
093    @Override
094    public JsExpression translateAsSet(@NotNull JsExpression setTo) {
095        return translateAsSet(getReceiver(), setTo);
096    }
097
098    @Nullable
099    private JsExpression getReceiver() {
100        if (receiver != null) {
101            return receiver;
102        }
103        assert propertyDescriptor.getReceiverParameter() == null : "Can't have native extension properties.";
104        DeclarationDescriptor expectedThisDescriptor = getExpectedThisDescriptor(propertyDescriptor);
105        if (expectedThisDescriptor == null) {
106            return null;
107        }
108        return context().getThisObject(expectedThisDescriptor);
109    }
110
111    @NotNull
112    @Override
113    public CachedAccessTranslator getCached() {
114        return new CachedPropertyAccessTranslator(getReceiver(), this, context());
115    }
116}