| /* |
| * 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.commons.dbutils.handlers; |
| |
| import java.sql.ResultSet; |
| import java.sql.SQLException; |
| |
| import org.apache.commons.dbutils.BasicRowProcessor; |
| import org.apache.commons.dbutils.ResultSetHandler; |
| import org.apache.commons.dbutils.RowProcessor; |
| |
| /** |
| * {@code ResultSetHandler} implementation that converts a |
| * {@code ResultSet} into an {@code Object[]}. This class is |
| * thread safe. |
| * |
| * @see org.apache.commons.dbutils.ResultSetHandler |
| */ |
| public class ArrayHandler implements ResultSetHandler<Object[]> { |
| |
| /** |
| * Singleton processor instance that handlers share to save memory. Notice |
| * the default scoping to allow only classes in this package to use this |
| * instance. |
| */ |
| static final RowProcessor ROW_PROCESSOR = new BasicRowProcessor(); |
| |
| /** |
| * An empty array to return when no more rows are available in the ResultSet. |
| */ |
| private static final Object[] EMPTY_ARRAY = new Object[0]; |
| |
| /** |
| * The RowProcessor implementation to use when converting rows |
| * into arrays. |
| */ |
| private final RowProcessor convert; |
| |
| /** |
| * Creates a new instance of ArrayHandler using a |
| * {@code BasicRowProcessor} for conversion. |
| */ |
| public ArrayHandler() { |
| this(ROW_PROCESSOR); |
| } |
| |
| /** |
| * Creates a new instance of ArrayHandler. |
| * |
| * @param convert The {@code RowProcessor} implementation |
| * to use when converting rows into arrays. |
| */ |
| public ArrayHandler(final RowProcessor convert) { |
| super(); |
| this.convert = convert; |
| } |
| |
| /** |
| * Places the column values from the first row in an {@code Object[]}. |
| * @param rs {@code ResultSet} to process. |
| * @return An Object[]. If there are no rows in the {@code ResultSet} |
| * an empty array will be returned. |
| * |
| * @throws SQLException if a database access error occurs |
| * @see org.apache.commons.dbutils.ResultSetHandler#handle(java.sql.ResultSet) |
| */ |
| @Override |
| public Object[] handle(final ResultSet rs) throws SQLException { |
| return rs.next() ? this.convert.toArray(rs) : EMPTY_ARRAY; |
| } |
| |
| } |