org.jetbrains.kotlin.resolve.scopes.JetScopeSelectorUtil Maven / Gradle / Ivy

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/*
 * Copyright 2010-2015 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.kotlin.resolve.scopes;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.kotlin.descriptors.*;
import org.jetbrains.kotlin.name.Name;

import java.util.*;

public class JetScopeSelectorUtil {
    private JetScopeSelectorUtil() {
    }

    public interface ScopeByNameSelector {
        @Nullable
        D get(@NotNull JetScope scope, @NotNull Name name);
    }

    public interface ScopeByNameMultiSelector {
        @NotNull
        Collection get(JetScope scope, Name name);
    }

    @NotNull
    public static  Collection collect(Collection scopes, ScopeByNameMultiSelector selector, Name name) {
        Set descriptors = new HashSet();

        for (JetScope scope : scopes) {
            descriptors.addAll(selector.get(scope, name));
        }

        return descriptors;
    }

    public static final ScopeByNameSelector CLASSIFIER_DESCRIPTOR_SCOPE_SELECTOR =
            new ScopeByNameSelector() {
                @Nullable
                @Override
                public ClassifierDescriptor get(@NotNull JetScope scope, @NotNull Name name) {
                    return scope.getClassifier(name);
                }
            };

    public static final ScopeByNameSelector PACKAGE_SCOPE_SELECTOR =
            new ScopeByNameSelector() {
                @Nullable
                @Override
                public PackageViewDescriptor get(@NotNull JetScope scope, @NotNull Name name) {
                    return scope.getPackage(name);
                }
            };

    public static final ScopeByNameSelector VARIABLE_DESCRIPTOR_SCOPE_SELECTOR =
            new ScopeByNameSelector() {
                @Nullable
                @Override
                public VariableDescriptor get(@NotNull JetScope scope, @NotNull Name name) {
                    return scope.getLocalVariable(name);
                }
            };

    public static final ScopeByNameMultiSelector NAMED_FUNCTION_SCOPE_SELECTOR =
            new ScopeByNameMultiSelector() {
                @NotNull
                @Override
                public Collection get(@NotNull JetScope scope, @NotNull Name name) {
                    return scope.getFunctions(name);
                }
            };

    public static final ScopeByNameMultiSelector NAMED_PROPERTIES_SCOPE_SELECTOR =
            new ScopeByNameMultiSelector() {
                @NotNull
                @Override
                public Collection get(@NotNull JetScope scope, @NotNull Name name) {
                    return scope.getProperties(name);
                }
            };

    @Nullable
    public static  D getFirstMatch(
            @NotNull JetScope[] scopes,
            @NotNull Name name,
            @NotNull ScopeByNameSelector descriptorSelector
    ) {
        for (JetScope scope : scopes) {
            D descriptor = descriptorSelector.get(scope, name);

            if (descriptor != null) {
                return descriptor;
            }
        }

        return null;
    }

    @NotNull
    public static  Set getFromAllScopes(
            @NotNull JetScope[] scopes,
            @NotNull Name name,
            @NotNull ScopeByNameMultiSelector descriptorsSelector
    ) {
        if (scopes.length == 0) return Collections.emptySet();

        Set descriptors = new LinkedHashSet();
        for (JetScope jetScope : scopes) {
            descriptors.addAll(descriptorsSelector.get(jetScope, name));
        }

        return descriptors;
    }
}