/* Copyright 2014 The Johns Hopkins University Applied Physics Laboratory * * 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 edu.jhuapl.tinkerpop.parser; import java.util.ArrayList; import java.util.List; import java.util.Map.Entry; import org.apache.accumulo.core.data.Key; import org.apache.accumulo.core.data.Value; import com.tinkerpop.blueprints.Edge; import com.tinkerpop.blueprints.Element; import com.tinkerpop.blueprints.IndexableGraph; import com.tinkerpop.blueprints.KeyIndexableGraph; import com.tinkerpop.blueprints.Vertex; import edu.jhuapl.tinkerpop.AccumuloGraphException; /** * Entry parser for index metadata. The format * is the same for both {@link IndexableGraph} * and {@link KeyIndexableGraph} functionality. * For the former, this parser returns names of * indexes. For the latter, the parser returns * indexed keys. */ public class IndexedItemsListParser implements EntryParser<List<IndexedItem>> { private final Class<? extends Element> elementClass; /** * Constructor to return all items regardless * of element class. */ public IndexedItemsListParser() { this(Element.class); } /** * Create a parser for items of the specified element class. * This may be Vertex, Edge, or Element. * @param elementClass */ public IndexedItemsListParser(Class<? extends Element> elementClass) { // Validate element class. if (!Vertex.class.equals(elementClass) && !Edge.class.equals(elementClass) && !Element.class.equals(elementClass)) { throw new IllegalArgumentException("elementClass must be Vertex, Edge or Element"); } this.elementClass = elementClass; } @SuppressWarnings("unchecked") @Override public List<IndexedItem> parse(Iterable<Entry<Key,Value>> entries) { List<IndexedItem> items = new ArrayList<IndexedItem>(); for (Entry<Key, Value> entry : entries) { Class<? extends Element> clazz; try { clazz = (Class<? extends Element>) Class.forName(entry.getKey() .getColumnQualifier().toString()); } catch (ClassNotFoundException e) { throw new AccumuloGraphException(e); } if (Element.class.equals(elementClass) || elementClass.equals(clazz)) { IndexedItem item = new IndexedItem(entry.getKey() .getRow().toString(), clazz); items.add(item); } } return items; } }