Source Code Cross Referenced for ResultObjectFactory.java in  » Database-ORM » iBATIS » com » ibatis » sqlmap » engine » mapping » result » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database ORM » iBATIS » com.ibatis.sqlmap.engine.mapping.result 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         *  Copyright 2006 The Apache Software Foundation
03:         *
04:         *  Licensed under the Apache License, Version 2.0 (the "License");
05:         *  you may not use this file except in compliance with the License.
06:         *  You may obtain a copy of the License at
07:         *
08:         *      http://www.apache.org/licenses/LICENSE-2.0
09:         *
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.result;
17:
18:        /**
19:         * iBATIS uses an implementation of this interface to create
20:         * result objects after the execution of a statement.  To use, specify
21:         * your implementation class as the type for the "resultObjectFactory"
22:         * element in the SqlMapConfig.  Any implementation of this interface
23:         * must have a public no argument constructor.
24:         * 
25:         * Note that iBATIS makes use of this interface through the
26:         * ResultObjectFactoryUtil class.
27:         *   
28:         * @author Jeff Butler
29:         *
30:         */
31:        public interface ResultObjectFactory {
32:
33:            /**
34:             * Returns a new instance of the requested class.
35:             * iBATIS will call this method in these circumstances:
36:             * 
37:             * <ul>
38:             *   <li>When processing a result set - to create new instances of result objects</li>
39:             *   <li>When processing the output parameters of a stored procedure - to create
40:             *       instances of OUTPUT parameters
41:             *   </li>
42:             *   <li>When processing a nested select - to create instances of parameter
43:             *       objects on the nested select
44:             *   </li>
45:             *   <li>When processing result maps with nested result maps.  iBATIS will
46:             *     ask the factory to create an instance of the nested object.  If the nested
47:             *     object is some implementation of <code>java.util.Collection</code>
48:             *     then iBATIS will supply default implementations of the common interfaces
49:             *     if the factory chooses not to create the object.  If the
50:             *     embedded object is a <code>java.util.List</code> or 
51:             *     <code>java.util.Collection</code> the default behavior is to
52:             *     create an <code>java.util.ArrayList</code>.  If the embedded object is a
53:             *     <code>java.util.Set</code> the default behavior
54:             *     is to create a <code>java.util.HashSet</code>.</li>
55:             * </ul>
56:             *
57:             * If you return <code>null</code> from this method, iBATIS will attempt
58:             * to create in instance of the class with it's normal mechanism.  This means
59:             * that you can selectively choose which objects to create with this interface.
60:             * In the event that you choose not to create an object, iBATIS will translate some
61:             * common interfaces to their common implementations.  If the requested
62:             * class is List or Collection iBATIS will create an ArrayList.  If the requested
63:             * class is Set then iBATIS will create a HashSet.  But these rules only apply
64:             * if you choose not to create the object.  So you can use this factory to
65:             * supply custom implementations of those interfaces if you so desire.
66:             * 
67:             * @param statementId the ID of the statement that generated the call to this method
68:             * @param clazz the type of object to create
69:             * @return a new instance of the specified class.  The instance must
70:             *   be castable to the specified class.  If you return <code>null</code>,
71:             *   iBATIS will attempt to create the instance using it's normal 
72:             *   mechanism.
73:             * @throws InstantiationException if the instance cannot be created.  If you
74:             *   throw this Exception, iBATIS will throw a runtime exception in response and
75:             *   will end.
76:             * @throws IllegalAccessException if the constructor cannot be accessed.  If you
77:             *   throw this Exception, iBATIS will throw a runtime exception in response and
78:             *   will end.
79:             */
80:            Object createInstance(String statementId, Class clazz)
81:                    throws InstantiationException, IllegalAccessException;
82:
83:            /**
84:             * Called for each property configured in the SqlMapCong file.  All the properties
85:             * will be set before any call is made to createInstance
86:             * 
87:             * @param name
88:             * @param value
89:             */
90:            void setProperty(String name, String value);
91:        }
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