001    /*
002     * SonarQube, open source software quality management tool.
003     * Copyright (C) 2008-2014 SonarSource
004     * mailto:contact AT sonarsource DOT com
005     *
006     * SonarQube 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     * SonarQube 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 License
017     * along with this program; if not, write to the Free Software Foundation,
018     * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
019     */
020    package org.sonar.batch.index;
021    
022    import com.google.common.base.Preconditions;
023    import com.google.common.base.Strings;
024    import com.google.common.collect.Maps;
025    import org.sonar.api.BatchComponent;
026    import org.sonar.api.resources.Resource;
027    
028    import java.util.Map;
029    
030    /**
031     * @since 3.6
032     */
033    public class ResourceCache implements BatchComponent {
034      // resource by component key
035      private final Map<String, Resource> resources = Maps.newHashMap();
036    
037      public Resource get(String componentKey) {
038        return resources.get(componentKey);
039      }
040    
041      public ResourceCache add(Resource resource) {
042        String componentKey = resource.getEffectiveKey();
043        Preconditions.checkState(!Strings.isNullOrEmpty(componentKey), "Missing resource effective key");
044        resources.put(componentKey, resource);
045        return this;
046      }
047    }