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.jet.lang.descriptors.impl;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.jet.lang.descriptors.PackageFragmentDescriptor;
021    import org.jetbrains.jet.lang.descriptors.PackageFragmentProvider;
022    import org.jetbrains.jet.lang.resolve.name.FqName;
023    
024    import java.util.*;
025    
026    public class CompositePackageFragmentProvider implements PackageFragmentProvider {
027        // can be modified from outside
028        private final List<PackageFragmentProvider> providers;
029    
030        public CompositePackageFragmentProvider(@NotNull List<PackageFragmentProvider> providers) {
031            this.providers = providers;
032        }
033    
034        @NotNull
035        @Override
036        public List<PackageFragmentDescriptor> getPackageFragments(@NotNull FqName fqName) {
037            ArrayList<PackageFragmentDescriptor> result = new ArrayList<PackageFragmentDescriptor>();
038            for (PackageFragmentProvider provider : providers) {
039                result.addAll(provider.getPackageFragments(fqName));
040            }
041            result.trimToSize();
042            return result;
043        }
044    
045        @NotNull
046        @Override
047        public Collection<FqName> getSubPackagesOf(@NotNull FqName fqName) {
048            Set<FqName> result = new HashSet<FqName>();
049            for (PackageFragmentProvider provider : providers) {
050                result.addAll(provider.getSubPackagesOf(fqName));
051            }
052            return result;
053        }
054    }