Java tutorial
package org.apache.rya.indexing.mongodb; /* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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. */ import java.util.Set; import org.openrdf.model.URI; import com.mongodb.BasicDBObject; import com.mongodb.DBObject; import com.mongodb.QueryBuilder; import org.apache.rya.indexing.StatementConstraints; import org.apache.rya.mongodb.dao.SimpleMongoDBStorageStrategy; public class IndexingMongoDBStorageStrategy extends SimpleMongoDBStorageStrategy { public DBObject getQuery(final StatementConstraints contraints) { final QueryBuilder queryBuilder = QueryBuilder.start(); if (contraints.hasSubject()) { queryBuilder.and(new BasicDBObject(SUBJECT, contraints.getSubject().toString())); } if (contraints.hasPredicates()) { final Set<URI> predicates = contraints.getPredicates(); if (predicates.size() > 1) { for (final URI pred : predicates) { final DBObject currentPred = new BasicDBObject(PREDICATE, pred.toString()); queryBuilder.or(currentPred); } } else if (!predicates.isEmpty()) { queryBuilder.and(new BasicDBObject(PREDICATE, predicates.iterator().next().toString())); } } if (contraints.hasContext()) { queryBuilder.and(new BasicDBObject(CONTEXT, contraints.getContext().toString())); } return queryBuilder.get(); } }