001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2008-2012 SonarSource
004     * mailto:contact AT sonarsource DOT com
005     *
006     * Sonar is free software; you can redistribute it and/or
007     * modify it under the terms of the GNU Lesser General Public
008     * License as published by the Free Software Foundation; either
009     * version 3 of the License, or (at your option) any later version.
010     *
011     * Sonar is distributed in the hope that it will be useful,
012     * but WITHOUT ANY WARRANTY; without even the implied warranty of
013     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014     * Lesser General Public License for more details.
015     *
016     * You should have received a copy of the GNU Lesser General Public
017     * License along with Sonar; if not, write to the Free Software
018     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
019     */
020    package org.sonar.api.resources;
021    
022    import com.google.common.annotations.Beta;
023    import com.google.common.base.Preconditions;
024    import com.google.common.base.Predicate;
025    import com.google.common.collect.*;
026    import org.sonar.api.BatchExtension;
027    import org.sonar.api.ServerExtension;
028    import org.sonar.api.batch.InstantiationStrategy;
029    
030    import javax.annotation.concurrent.Immutable;
031    import java.util.Arrays;
032    import java.util.List;
033    
034    /**
035     * @since 2.14
036     */
037    @Beta
038    @Immutable
039    @InstantiationStrategy(InstantiationStrategy.PER_BATCH)
040    public final class ResourceTypeTree implements BatchExtension, ServerExtension {
041    
042      private List<ResourceType> types;
043      private ListMultimap<String, String> relations;
044    
045      private ResourceTypeTree(Builder builder) {
046        this.types = ImmutableList.copyOf(builder.types);
047        this.relations = ImmutableListMultimap.copyOf(builder.relations);
048      }
049    
050      public List<ResourceType> getTypes() {
051        return types;
052      }
053    
054      public List<String> getChildren(String qualifier) {
055        return relations.get(qualifier);
056      }
057    
058      public List<String> getLeaves() {
059        return ImmutableList.copyOf(Collections2.filter(relations.values(), new Predicate<String>() {
060          public boolean apply(String qualifier) {
061            return relations.get(qualifier).isEmpty();
062          }
063        }));
064      }
065    
066      public static Builder builder() {
067        return new Builder();
068      }
069    
070      public static final class Builder {
071        private List<ResourceType> types = Lists.newArrayList();
072        private ListMultimap<String, String> relations = ArrayListMultimap.create();
073    
074        private Builder() {
075        }
076    
077        public Builder addType(ResourceType type) {
078          Preconditions.checkNotNull(type);
079          Preconditions.checkArgument(!types.contains(type), String.format("%s is already registered", type.getQualifier()));
080          types.add(type);
081          return this;
082        }
083    
084        public Builder addRelations(String parentQualifier, String... childrenQualifiers) {
085          Preconditions.checkNotNull(parentQualifier);
086          Preconditions.checkNotNull(childrenQualifiers);
087          Preconditions.checkArgument(childrenQualifiers.length > 0, "childrenQualifiers can't be empty");
088          relations.putAll(parentQualifier, Arrays.asList(childrenQualifiers));
089          return this;
090        }
091    
092        public ResourceTypeTree build() {
093          return new ResourceTypeTree(this);
094        }
095      }
096    
097    }