001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.commons.dbutils.handlers;
018    
019    import java.sql.ResultSet;
020    import java.sql.SQLException;
021    import java.util.List;
022    
023    import org.apache.commons.dbutils.ResultSetHandler;
024    import org.apache.commons.dbutils.RowProcessor;
025    
026    /**
027     * <code>ResultSetHandler</code> implementation that converts a
028     * <code>ResultSet</code> into a <code>List</code> of beans. This class is 
029     * thread safe.
030     * 
031     * @see org.apache.commons.dbutils.ResultSetHandler
032     */
033    public class BeanListHandler<T> implements ResultSetHandler<List<T>> {
034    
035        /**
036         * The Class of beans produced by this handler.
037         */
038        private final Class<T> type;
039    
040        /**
041         * The RowProcessor implementation to use when converting rows 
042         * into beans.
043         */
044        private final RowProcessor convert;
045    
046        /** 
047         * Creates a new instance of BeanListHandler.
048         * 
049         * @param type The Class that objects returned from <code>handle()</code>
050         * are created from.
051         */
052        public BeanListHandler(Class<T> type) {
053            this(type, ArrayHandler.ROW_PROCESSOR);
054        }
055    
056        /** 
057         * Creates a new instance of BeanListHandler.
058         * 
059         * @param type The Class that objects returned from <code>handle()</code>
060         * are created from.
061         * @param convert The <code>RowProcessor</code> implementation 
062         * to use when converting rows into beans.
063         */
064        public BeanListHandler(Class<T> type, RowProcessor convert) {
065            this.type = type;
066            this.convert = convert;
067        }
068    
069        /**
070         * Convert the whole <code>ResultSet</code> into a List of beans with
071         * the <code>Class</code> given in the constructor.
072         * 
073         * @param rs The <code>ResultSet</code> to handle.
074         * 
075         * @return A List of beans, never <code>null</code>.
076         * 
077         * @throws SQLException if a database access error occurs
078         * @see org.apache.commons.dbutils.RowProcessor#toBeanList(ResultSet, Class)
079         */
080        public List<T> handle(ResultSet rs) throws SQLException {
081            return this.convert.toBeanList(rs, type);
082        }
083    }