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Java > Open Source Codes > com > ibatis > sqlmap > engine > mapping > sql > simple > SimpleDynamicSql


1 /*
2  * Copyright 2004 Clinton Begin
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package com.ibatis.sqlmap.engine.mapping.sql.simple;
17
18 import com.ibatis.common.beans.Probe;
19 import com.ibatis.common.beans.ProbeFactory;
20 import com.ibatis.sqlmap.client.SqlMapException;
21 import com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate;
22 import com.ibatis.sqlmap.engine.mapping.parameter.ParameterMap;
23 import com.ibatis.sqlmap.engine.mapping.result.ResultMap;
24 import com.ibatis.sqlmap.engine.mapping.sql.Sql;
25 import com.ibatis.sqlmap.engine.scope.RequestScope;
26
27 import java.util.StringTokenizer JavaDoc;
28
29 public class SimpleDynamicSql implements Sql {
30
31   private static final Probe PROBE = ProbeFactory.getProbe();
32
33   private static final String JavaDoc ELEMENT_TOKEN = "$";
34
35   private String JavaDoc sqlStatement;
36
37   private SqlMapExecutorDelegate delegate;
38
39   public SimpleDynamicSql(SqlMapExecutorDelegate delegate, String JavaDoc sqlStatement) {
40     this.delegate = delegate;
41     this.sqlStatement = sqlStatement;
42   }
43
44   public String JavaDoc getSql(RequestScope request, Object JavaDoc parameterObject) {
45     return processDynamicElements(sqlStatement, parameterObject);
46   }
47
48   public ParameterMap getParameterMap(RequestScope request, Object JavaDoc parameterObject) {
49     return request.getParameterMap();
50   }
51
52   public ResultMap getResultMap(RequestScope request, Object JavaDoc parameterObject) {
53     return request.getResultMap();
54   }
55
56   public void cleanup(RequestScope request) {
57   }
58
59   public static boolean isSimpleDynamicSql(String JavaDoc sql) {
60     return sql != null && sql.indexOf(ELEMENT_TOKEN) > -1;
61   }
62
63   private String JavaDoc processDynamicElements(String JavaDoc sql, Object JavaDoc parameterObject) {
64     StringTokenizer JavaDoc parser = new StringTokenizer JavaDoc(sql, ELEMENT_TOKEN, true);
65     StringBuffer JavaDoc newSql = new StringBuffer JavaDoc();
66
67     String JavaDoc token = null;
68     String JavaDoc lastToken = null;
69     while (parser.hasMoreTokens()) {
70       token = parser.nextToken();
71
72       if (ELEMENT_TOKEN.equals(lastToken)) {
73         if (ELEMENT_TOKEN.equals(token)) {
74           newSql.append(ELEMENT_TOKEN);
75           token = null;
76         } else {
77
78           Object JavaDoc value = null;
79           if (parameterObject != null) {
80             if (delegate.getTypeHandlerFactory().hasTypeHandler(parameterObject.getClass())) {
81               value = parameterObject;
82             } else {
83               value = PROBE.getObject(parameterObject, token);
84             }
85           }
86           if (value != null) {
87             newSql.append(String.valueOf(value));
88           }
89
90           token = parser.nextToken();
91           if (!ELEMENT_TOKEN.equals(token)) {
92             throw new SqlMapException("Unterminated dynamic element in sql (" + sql + ").");
93           }
94           token = null;
95         }
96       } else {
97         if (!ELEMENT_TOKEN.equals(token)) {
98           newSql.append(token);
99         }
100       }
101
102       lastToken = token;
103     }
104
105     return newSql.toString();
106   }
107
108
109 }
110
111
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