org.jetbrains.jet.lang.resolve.scopes.SubstitutingScope Maven / Gradle / Ivy

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/*
 * Copyright 2010-2013 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.
 */

package org.jetbrains.jet.lang.resolve.scopes;

import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.annotations.TestOnly;
import org.jetbrains.jet.lang.descriptors.*;
import org.jetbrains.jet.lang.resolve.name.Name;
import org.jetbrains.jet.lang.types.TypeSubstitutor;
import org.jetbrains.jet.utils.Printer;

import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class SubstitutingScope implements JetScope {

    private final JetScope workerScope;
    private final TypeSubstitutor substitutor;

    private Map substitutedDescriptors = null;
    private Collection allDescriptors = null;

    public SubstitutingScope(JetScope workerScope, @NotNull TypeSubstitutor substitutor) {
        this.workerScope = workerScope;
        this.substitutor = substitutor;
    }

    @Nullable
    private  D substitute(@Nullable D descriptor) {
        if (descriptor == null) return null;
        if (substitutor.isEmpty()) return descriptor;

        if (substitutedDescriptors == null) {
            substitutedDescriptors = Maps.newHashMap();
        }

        DeclarationDescriptor substituted = substitutedDescriptors.get(descriptor);
        if (substituted == null && !substitutedDescriptors.containsKey(descriptor)) {
            substituted = descriptor.substitute(substitutor);

            //noinspection ConstantConditions
            substitutedDescriptors.put(descriptor, substituted);
        }

        //noinspection unchecked
        return (D) substituted;
    }

    @NotNull
    private  Collection substitute(@NotNull Collection descriptors) {
        if (substitutor.isEmpty()) return descriptors;
        if (descriptors.isEmpty()) return descriptors;

        Set result = Sets.newHashSetWithExpectedSize(descriptors.size());
        for (D descriptor : descriptors) {
            D substitute = substitute(descriptor);
            if (substitute != null) {
                result.add(substitute);
            }
        }

        return result;
    }

    @NotNull
    @Override
    public Collection getProperties(@NotNull Name name) {
        return substitute(workerScope.getProperties(name));
    }

    @Override
    public VariableDescriptor getLocalVariable(@NotNull Name name) {
        return substitute(workerScope.getLocalVariable(name));
    }

    @Override
    public ClassifierDescriptor getClassifier(@NotNull Name name) {
        return substitute(workerScope.getClassifier(name));
    }

    @NotNull
    @Override
    public Collection getFunctions(@NotNull Name name) {
        return substitute(workerScope.getFunctions(name));
    }

    @Override
    public PackageViewDescriptor getPackage(@NotNull Name name) {
        return workerScope.getPackage(name);
    }

    @NotNull
    @Override
    public List getImplicitReceiversHierarchy() {
        throw new UnsupportedOperationException(); // TODO
    }

    @NotNull
    @Override
    public DeclarationDescriptor getContainingDeclaration() {
        return workerScope.getContainingDeclaration();
    }

    @NotNull
    @Override
    public Collection getDeclarationsByLabel(@NotNull Name labelName) {
        throw new UnsupportedOperationException(); // TODO
    }

    @NotNull
    @Override
    public Collection getAllDescriptors() {
        if (allDescriptors == null) {
            allDescriptors = substitute(workerScope.getAllDescriptors());
        }
        return allDescriptors;
    }

    @NotNull
    @Override
    public Collection getOwnDeclaredDescriptors() {
        return substitute(workerScope.getOwnDeclaredDescriptors());
    }

    @TestOnly
    @Override
    public void printScopeStructure(@NotNull Printer p) {
        p.println(getClass().getSimpleName(), " {");
        p.pushIndent();

        p.println("substitutor = ");
        p.pushIndent();
        p.println(substitutor);
        p.popIndent();

        p.print("workerScope = ");
        workerScope.printScopeStructure(p.withholdIndentOnce());

        p.popIndent();
        p.println("}");
    }
}