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Java > Open Source Codes > org > apache > ojb > broker > accesslayer > conversions > IntList2VarcharFieldConversion


1 package org.apache.ojb.broker.accesslayer.conversions;
2
3 /* Copyright 2004-2005 The Apache Software Foundation
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * 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
18 import java.util.ArrayList JavaDoc;
19 import java.util.List JavaDoc;
20
21 import org.apache.commons.lang.StringUtils;
22
23 /**
24  * This implementation of the {@link FieldConversion} interface converts
25  * between a {@link java.util.List} of {@link java.lang.Integer} objects and a database
26  * <em>varchar</em> field.
27  *
28  * @author Guillaume Nodet
29  * @version $Id: IntList2VarcharFieldConversion.java,v 1.2.2.2 2005/12/21 22:23:38 tomdz Exp $
30  */
31 public class IntList2VarcharFieldConversion implements FieldConversion
32 {
33
34     private static final String JavaDoc NULLVALUE = "#NULL#";
35     private static final String JavaDoc EMPTYCOLLEC = "#EMTPY#";
36
37     public IntList2VarcharFieldConversion()
38     {
39     }
40
41     /* (non-Javadoc)
42      * @see org.apache.ojb.broker.accesslayer.conversions.FieldConversion#javaToSql(java.lang.Object)
43      */
44     public Object JavaDoc javaToSql(Object JavaDoc source) throws ConversionException
45     {
46         if (source == null)
47         {
48             return NULLVALUE;
49         }
50
51         try
52         {
53             List JavaDoc intList = (List JavaDoc) source;
54             if (intList.isEmpty())
55             {
56                 return EMPTYCOLLEC;
57             }
58
59             StringBuffer JavaDoc result = new StringBuffer JavaDoc();
60             for (int i = 0; i < intList.size(); i++)
61             {
62                 Integer JavaDoc obj = (Integer JavaDoc) intList.get(i);
63                 String JavaDoc newSt = obj.toString();
64                 newSt = StringUtils.replace(newSt, "#", "##");
65                 result.append(newSt);
66                 result.append("#");
67             }
68             return result.toString();
69         }
70         catch (ClassCastException JavaDoc e)
71         {
72             throw new ConversionException("Object is not a List of Integer it is a"
73                     + source.getClass().getName());
74         }
75     }
76
77     /* (non-Javadoc)
78      * @see org.apache.ojb.broker.accesslayer.conversions.FieldConversion#sqlToJava(java.lang.Object)
79      */
80     public Object JavaDoc sqlToJava(Object JavaDoc source) throws ConversionException
81     {
82
83         if (source == null)
84         {
85             return null;
86         }
87         if (!(source instanceof String JavaDoc))
88         {
89             throw new ConversionException("Object is not a String it is a"
90                     + source.getClass().getName());
91         }
92         if (source.toString().equals(NULLVALUE))
93         {
94             return null;
95         }
96         if (source.toString().equals(EMPTYCOLLEC))
97         {
98             return new ArrayList JavaDoc();
99         }
100
101         List JavaDoc v = new ArrayList JavaDoc();
102         String JavaDoc input = source.toString();
103         int pos = input.indexOf("#");
104
105         while (pos >= 0)
106         {
107             if (pos == 0)
108             {
109                 v.add("");
110             }
111             else
112             {
113                 v.add(Integer.valueOf(input.substring(0, pos)));
114             }
115
116             if (pos + 1 > input.length())
117             {
118                 //# at end causes outof bounds
119 break;
120             }
121
122             input = input.substring(pos + 1, input.length());
123             pos = input.indexOf("#");
124         }
125         return v;
126     }
127
128 }
129
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