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Java > Open Source Codes > org > apache > cayenne > ejbql > parser > EJBQLSum


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19 package org.apache.cayenne.ejbql.parser;
20
21 import java.util.HashMap JavaDoc;
22 import java.util.Map JavaDoc;
23
24 import org.apache.cayenne.ejbql.EJBQLExpressionVisitor;
25
26 /**
27  * @since 3.0
28  * @author Andrus Adamchik
29  */
30 public class EJBQLSum extends EJBQLAggregateColumn {
31
32     // per JPA spec, 4.8.4, SUM type mapping rules are a bit convoluted. Mapping them
33 // here...
34
35     static final Map JavaDoc typeMap;
36
37     static {
38         typeMap = new HashMap JavaDoc();
39         typeMap.put(Integer JavaDoc.class.getName(), Long JavaDoc.class.getName());
40         typeMap.put(Short JavaDoc.class.getName(), Long JavaDoc.class.getName());
41         typeMap.put(Float JavaDoc.class.getName(), Double JavaDoc.class.getName());
42     }
43
44     public EJBQLSum(int id) {
45         super(id);
46     }
47
48     protected boolean visitNode(EJBQLExpressionVisitor visitor) {
49         return visitor.visitSum(this);
50     }
51
52     public String JavaDoc getFunction() {
53         return "SUM";
54     }
55
56     public String JavaDoc getJavaType(String JavaDoc pathType) {
57
58         if (pathType == null) {
59             return "java.lang.Long";
60         }
61
62         // type map only contains mappings that are different from the attribute path, so
63 // if no mapping exists, return the argument passed to this method.
64 String JavaDoc mappedType = (String JavaDoc) typeMap.get(pathType);
65         return mappedType != null ? mappedType : pathType;
66     }
67 }
68
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