Coverage Report - org.apache.commons.dbutils.handlers.ScalarHandler
 
Classes in this File Line Coverage Branch Coverage Complexity
ScalarHandler
0%
0/15
0%
0/4
1.8
 
 1  
 /*
 2  
  * Licensed to the Apache Software Foundation (ASF) under one or more
 3  
  * contributor license agreements.  See the NOTICE file distributed with
 4  
  * this work for additional information regarding copyright ownership.
 5  
  * The ASF licenses this file to You under the Apache License, Version 2.0
 6  
  * (the "License"); you may not use this file except in compliance with
 7  
  * the License.  You may obtain a copy of the License at
 8  
  *
 9  
  *      http://www.apache.org/licenses/LICENSE-2.0
 10  
  *
 11  
  * Unless required by applicable law or agreed to in writing, software
 12  
  * distributed under the License is distributed on an "AS IS" BASIS,
 13  
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 14  
  * See the License for the specific language governing permissions and
 15  
  * limitations under the License.
 16  
  */
 17  
 package org.apache.commons.dbutils.handlers;
 18  
 
 19  
 import java.sql.ResultSet;
 20  
 import java.sql.SQLException;
 21  
 
 22  
 import org.apache.commons.dbutils.ResultSetHandler;
 23  
 
 24  
 /**
 25  
  * <code>ResultSetHandler</code> implementation that converts one
 26  
  * <code>ResultSet</code> column into an Object. This class is thread safe.
 27  
  * 
 28  
  * @see org.apache.commons.dbutils.ResultSetHandler
 29  
  */
 30  
 public class ScalarHandler implements ResultSetHandler {
 31  
 
 32  
     /**
 33  
      * The column number to retrieve.
 34  
      */
 35  
     private final int columnIndex;
 36  
 
 37  
     /**
 38  
      * The column name to retrieve.  Either columnName or columnIndex
 39  
      * will be used but never both.
 40  
      */
 41  
     private final String columnName;
 42  
 
 43  
     /** 
 44  
      * Creates a new instance of ScalarHandler.  The first column will
 45  
      * be returned from <code>handle()</code>.
 46  
      */
 47  
     public ScalarHandler() {
 48  0
         this(1, null);
 49  0
     }
 50  
 
 51  
     /** 
 52  
      * Creates a new instance of ScalarHandler.
 53  
      * 
 54  
      * @param columnIndex The index of the column to retrieve from the 
 55  
      * <code>ResultSet</code>.
 56  
      */
 57  
     public ScalarHandler(int columnIndex) {
 58  0
         this(columnIndex, null);
 59  0
     }
 60  
 
 61  
     /** 
 62  
      * Creates a new instance of ScalarHandler.
 63  
      * 
 64  
      * @param columnName The name of the column to retrieve from the 
 65  
      * <code>ResultSet</code>.
 66  
      */
 67  
     public ScalarHandler(String columnName) {
 68  0
         this(1, columnName);
 69  0
     }
 70  
 
 71  
     // Helper constructor
 72  0
     private ScalarHandler(int columnIndex, String columnName){
 73  0
         this.columnIndex = columnIndex;
 74  0
         this.columnName = columnName;        
 75  0
     }
 76  
 
 77  
     /**
 78  
      * Returns one <code>ResultSet</code> column as an object via the
 79  
      * <code>ResultSet.getObject()</code> method that performs type 
 80  
      * conversions.
 81  
      * 
 82  
      * @return The column or <code>null</code> if there are no rows in
 83  
      * the <code>ResultSet</code>.
 84  
      * 
 85  
      * @throws SQLException if a database access error occurs
 86  
      * 
 87  
      * @see org.apache.commons.dbutils.ResultSetHandler#handle(java.sql.ResultSet)
 88  
      */
 89  
     public Object handle(ResultSet rs) throws SQLException {
 90  
 
 91  0
         if (rs.next()) {
 92  0
             if (this.columnName == null) {
 93  0
                 return rs.getObject(this.columnIndex);
 94  
             } else {
 95  0
                 return rs.getObject(this.columnName);
 96  
             }
 97  
 
 98  
         } else {
 99  0
             return null;
 100  
         }
 101  
     }
 102  
 }