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Java > Open Source Codes > org > apache > cayenne > jpa > bridge > JpaSQLTemplate


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19
20
21 package org.apache.cayenne.jpa.bridge;
22
23 import java.util.Collections JavaDoc;
24
25 import org.apache.cayenne.jpa.map.JpaQueryHint;
26 import org.apache.cayenne.CayenneRuntimeException;
27 import org.apache.cayenne.map.EntityResolver;
28 import org.apache.cayenne.query.Query;
29 import org.apache.cayenne.query.SQLTemplate;
30
31 /**
32  * An indirect query that resolves to Cayenne SQLTemplate using information from JPA query
33  * hints.
34  *
35  * @author Andrus Adamchik
36  */
37 public class JpaSQLTemplate extends JpaIndirectQuery {
38
39     /**
40      * Creates a SQLTemplate using query hints.
41      */
42     @Override JavaDoc
43     protected Query createReplacementQuery(EntityResolver resolver) {
44         SQLTemplate query = new SQLTemplate();
45         query.setDefaultTemplate(jpaQuery.getQuery());
46
47         if (parentEntity != null) {
48             query.setRoot(parentEntity);
49         }
50         else if (parentMap != null) {
51             query.setRoot(parentMap);
52         }
53         else {
54             throw new CayenneRuntimeException("Unknown query root. Name: " + getName());
55         }
56
57         // metadata hints
58 JpaQueryHint dataRowsHint = jpaQuery.getHint(QueryHints.DATA_ROWS_HINT);
59         if (dataRowsHint != null) {
60             query.setFetchingDataRows("true".equalsIgnoreCase(dataRowsHint.getValue()));
61         }
62
63         return query.queryWithParameters(parameters != null
64                 ? parameters
65                 : Collections.EMPTY_MAP);
66     }
67
68 }
69
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