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Java > Open Source Codes > org > apache > ojb > broker > accesslayer > RsQueryObject


1 package org.apache.ojb.broker.accesslayer;
2
3 /* Copyright 2003-2005 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 org.apache.ojb.broker.query.Query;
19 import org.apache.ojb.broker.query.QueryBySQL;
20 import org.apache.ojb.broker.metadata.ClassDescriptor;
21
22 /**
23  * Helper class for {@link RsIterator} queries.
24  *
25  * @author <a HREF="mailto:armin@codeAuLait.de">Armin Waibel</a>
26  * @version $Id: RsQueryObject.java,v 1.5.2.2 2005/12/21 22:22:58 tomdz Exp $
27  */
28 public class RsQueryObject
29 {
30     private Query query;
31     private ClassDescriptor cld;
32     private boolean isSQLBased;
33
34     //*******************************************
35 // static access methods
36 //*******************************************
37
38     /**
39      * Returns a new instance of this class.
40      */
41     public static RsQueryObject get(ClassDescriptor cld, Query query)
42     {
43         return new RsQueryObject(cld, query);
44     }
45
46
47     //*******************************************
48 // private constructors
49 //*******************************************
50 private RsQueryObject(ClassDescriptor cld, Query query)
51     {
52         this.query = query;
53         this.cld = cld;
54         if(query instanceof QueryBySQL)
55         {
56             isSQLBased = true;
57         }
58     }
59
60     //*******************************************
61 // public methods
62 //*******************************************
63 public ResultSetAndStatement performQuery(JdbcAccess jdbcAccess)
64     {
65         if (isSQLBased())
66         {
67
68             return jdbcAccess.executeSQL(((QueryBySQL) query).getSql(), cld, Query.SCROLLABLE);
69         }
70         else
71         {
72             return jdbcAccess.executeQuery(query, cld);
73         }
74     }
75
76     public boolean usePaging()
77     {
78         return query.usePaging();
79     }
80
81     public int getStartIndex()
82     {
83         return query.getStartAtIndex();
84     }
85
86     public int getEndIndex()
87     {
88         return query.getEndAtIndex();
89     }
90
91     public ClassDescriptor getClassDescriptor()
92     {
93         return cld;
94     }
95
96     public Query getQuery()
97     {
98         return query;
99     }
100
101     public boolean isSQLBased()
102     {
103         return isSQLBased;
104     }
105
106     public String JavaDoc getSQLBasedQuery()
107     {
108         if(isSQLBased())
109         {
110             return ((QueryBySQL)query).getSql();
111         }
112         else
113         {
114             return null;
115         }
116     }
117
118     public String JavaDoc toString()
119     {
120         return this.getClass().getName() +
121                 "[" + "query: " + query + ", class descriptor: " + cld.getClassNameOfObject() + "]";
122     }
123 }
124
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