| /** |
| * 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. |
| */ |
| package org.apache.activemq.console.filter; |
| |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| public abstract class ResultTransformFilter implements QueryFilter { |
| private QueryFilter next; |
| |
| /** |
| * Constructs a query filter that transform the format of the query result |
| * |
| * @param next - the query filter to retrieve the results from |
| */ |
| protected ResultTransformFilter(QueryFilter next) { |
| this.next = next; |
| } |
| |
| /** |
| * Transforms the queried results to a collection of different objects |
| * |
| * @param query - the query string |
| * @return collections of transformed objects |
| * @throws Exception |
| */ |
| public List query(String query) throws Exception { |
| return transformList(next.query(query)); |
| } |
| |
| /** |
| * Transforms the queried results to a collection of different objects |
| * |
| * @param queries - the query map |
| * @return collections of transformed objects |
| * @throws Exception |
| */ |
| public List<Object> query(List queries) throws Exception { |
| return transformList(next.query(queries)); |
| } |
| |
| /** |
| * Transforms a collection to a collection of different objects. |
| * |
| * @param result - the collection to transform |
| * @return collection of properties objects |
| */ |
| protected List<Object> transformList(List<Object> result) throws Exception { |
| List<Object> props = new ArrayList<Object>(); |
| |
| for (Iterator<Object> i = result.iterator(); i.hasNext();) { |
| props.add(transformElement(i.next())); |
| } |
| |
| return props; |
| } |
| |
| /** |
| * Transform a result object |
| * |
| * @param obj - the object instance to transform |
| * @return the transformed object |
| */ |
| protected abstract Object transformElement(Object obj) throws Exception; |
| |
| } |