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Java > Open Source Codes > org > objectstyle > cayenne > dba > JdbcActionBuilder


1 /* ====================================================================
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56 package org.objectstyle.cayenne.dba;
57
58 import org.objectstyle.cayenne.access.jdbc.BatchAction;
59 import org.objectstyle.cayenne.access.jdbc.ProcedureAction;
60 import org.objectstyle.cayenne.access.jdbc.SQLTemplateAction;
61 import org.objectstyle.cayenne.access.jdbc.SQLTemplateSelectAction;
62 import org.objectstyle.cayenne.access.jdbc.SelectAction;
63 import org.objectstyle.cayenne.access.jdbc.UpdateAction;
64 import org.objectstyle.cayenne.map.EntityResolver;
65 import org.objectstyle.cayenne.query.BatchQuery;
66 import org.objectstyle.cayenne.query.ProcedureQuery;
67 import org.objectstyle.cayenne.query.Query;
68 import org.objectstyle.cayenne.query.SQLAction;
69 import org.objectstyle.cayenne.query.SQLActionVisitor;
70 import org.objectstyle.cayenne.query.SQLTemplate;
71 import org.objectstyle.cayenne.query.SelectQuery;
72
73 /**
74  * A factory of default SQLActions. Adapters usually subclass JdbcActionBuilder to provide
75  * custom actions for various query types.
76  *
77  * @since 1.2
78  * @author Andrei Adamchik
79  */
80 public class JdbcActionBuilder implements SQLActionVisitor {
81
82     protected DbAdapter adapter;
83     protected EntityResolver entityResolver;
84
85     public JdbcActionBuilder(DbAdapter adapter, EntityResolver resolver) {
86         this.adapter = adapter;
87         this.entityResolver = resolver;
88     }
89
90     public SQLAction batchAction(BatchQuery query) {
91         // check run strategy...
92
93         // optimistic locking is not supported in batches due to JDBC driver limitations
94 boolean useOptimisticLock = query.isUsingOptimisticLocking();
95
96         boolean runningAsBatch = !useOptimisticLock && adapter.supportsBatchUpdates();
97         BatchAction action = new BatchAction(query, adapter, entityResolver);
98         action.setBatch(runningAsBatch);
99         return action;
100     }
101
102     public SQLAction procedureAction(ProcedureQuery query) {
103         return new ProcedureAction(query, adapter, entityResolver);
104     }
105
106     public SQLAction objectSelectAction(SelectQuery query) {
107         return new SelectAction(query, adapter, entityResolver);
108     }
109
110     public SQLAction sqlAction(SQLTemplate query) {
111         return query.isSelecting()
112                 ? new SQLTemplateSelectAction(query, adapter)
113                 : new SQLTemplateAction(query, adapter);
114     }
115
116     public SQLAction updateAction(Query query) {
117         if (query instanceof SQLTemplate) {
118             return new SQLTemplateAction((SQLTemplate) query, adapter);
119         }
120
121         return new UpdateAction(query, adapter, entityResolver);
122     }
123
124     /**
125      * Returns DbAdapter used associated with this action builder.
126      */
127     public DbAdapter getAdapter() {
128         return adapter;
129     }
130
131     /**
132      * Returns EntityResolver that can be used to gain access to the mapping objects.
133      */
134     public EntityResolver getEntityResolver() {
135         return entityResolver;
136     }
137 }
138
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