StringList2VarcharFieldConversion


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  ;
19  import java.util.List  ;
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.String} objects and a database
26   * <em>varchar</em> field.
27   * <br/>
28   * Strings may not contain "#" as this is used as separator.
29   *
30   * @author Guillaume Nodet
31   * @version $Id: StringList2VarcharFieldConversion.java,v 1.2.2.1 2005/12/21 22:23:38 tomdz Exp $
32   */
33  public class StringList2VarcharFieldConversion implements FieldConversion
34  {
35  
36      private static final String   NULLVALUE = "#NULL#";
37      private static final String   EMPTYCOLLEC = "#EMTPY#";
38  
39      public StringList2VarcharFieldConversion()
40      {
41      }
42  
43      /* (non-Javadoc)
44       * @see org.apache.ojb.broker.accesslayer.conversions.FieldConversion#javaToSql(java.lang.Object)
45       */
46      public Object   javaToSql(Object   source) throws ConversionException
47      {
48  
49          if (source == null)
50          {
51              return NULLVALUE;
52          }
53  
54          try
55          {
56              List   stringList = (List  ) source;
57              if (stringList.isEmpty())
58              {
59                  return NULLVALUE;
60              }
61  
62              StringBuffer   result = new StringBuffer  ();
63              for (int i = 0; i < stringList.size(); i++)
64              {
65                  String   newSt = (String  ) stringList.get(i);
66                  // introduced in JDK 1.4, replace with commons-lang
67                  // newSt = newSt.replaceAll("#", "##");
68                  newSt = StringUtils.replace(newSt, "#", "##");
69                  if (i > 0)
70                  {
71                      result.append("#");
72                  }
73                  result.append(newSt);
74              }
75              return result.toString();
76          }
77          catch (ClassCastException   e)
78          {
79              throw new ConversionException("Object is not a List of String it is a"
80                      + source.getClass().getName());
81          }
82      }
83  
84      /* (non-Javadoc)
85       * @see org.apache.ojb.broker.accesslayer.conversions.FieldConversion#sqlToJava(java.lang.Object)
86       */
87      public Object   sqlToJava(Object   source) throws ConversionException
88      {
89          if (source == null)
90          {
91              return null;
92          }
93          if (source.toString().equals(NULLVALUE))
94          {
95              return null;
96          }
97          if (source.toString().equals(EMPTYCOLLEC))
98          {
99              return new ArrayList  ();
100         }
101         List   v = new ArrayList  ();
102         StringBuffer   input = new StringBuffer  ();
103         StringBuffer   newString = new StringBuffer  ();
104         int pos = 0;
105         int length;
106 
107         input.append(source.toString());
108         length = input.length();
109         while (pos < length)
110         {
111             if (input.charAt(pos) != '#')
112             {
113                 newString.append(input.charAt(pos));
114             }
115             else
116             {
117                 if (input.charAt(pos + 1) != '#')
118                 {
119                     v.add(newString.toString());
120                     newString = new StringBuffer  ();
121                 }
122                 else
123                 {
124                     newString.append('#');
125                     ++pos;
126                 }
127             }
128             ++pos;
129         }
130         v.add(newString.toString());
131         return v;
132     }
133 }
134
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