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Java > Open Source Codes > org > apache > derby > client > am > ParameterMetaData40


1 /*
2
3    Derby - Class org.apache.derby.client.am.ParameterMetaData40
4
5    Licensed to the Apache Software Foundation (ASF) under one or more
6    contributor license agreements. See the NOTICE file distributed with
7    this work for additional information regarding copyright ownership.
8    The ASF licenses this file to You under the Apache License, Version 2.0
9    (the "License"); you may not use this file except in compliance with
10    the License. You may obtain a copy of the License at
11
12       http://www.apache.org/licenses/LICENSE-2.0
13
14    Unless required by applicable law or agreed to in writing, software
15    distributed under the License is distributed on an "AS IS" BASIS,
16    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17    See the License for the specific language governing permissions and
18    limitations under the License.
19
20 */
21
22 package org.apache.derby.client.am;
23
24 import java.sql.SQLException JavaDoc;
25 import org.apache.derby.shared.common.reference.SQLState;
26
27 public class ParameterMetaData40 extends ParameterMetaData {
28     
29     /**
30      *
31      * Calls the superclass constructor to pass the arguments
32      * @param columnMetaData ColumnMetaData
33      *
34      */
35     public ParameterMetaData40(ColumnMetaData columnMetaData) {
36         super(columnMetaData);
37     }
38     
39     /**
40      * Returns false unless <code>interfaces</code> is implemented
41      *
42      * @param interfaces a Class defining an interface.
43      * @return true if this implements the interface or
44      * directly or indirectly wraps an object
45      * that does.
46      * @throws java.sql.SQLException if an error occurs while determining
47      * whether this is a wrapper for an object
48      * with the given interface.
49      */
50     public boolean isWrapperFor(Class JavaDoc<?> interfaces) throws SQLException JavaDoc {
51         return interfaces.isInstance(this);
52     }
53     
54     /**
55      * Returns <code>this</code> if this class implements the interface
56      *
57      * @param interfaces a Class defining an interface
58      * @return an object that implements the interface
59      * @throws java.sql.SQLExption if no object if found that implements the
60      * interface
61      */
62     public <T> T unwrap(java.lang.Class JavaDoc<T> interfaces)
63                                    throws SQLException JavaDoc {
64         try {
65             return interfaces.cast(this);
66         } catch (ClassCastException JavaDoc cce) {
67             throw new SqlException(null,new ClientMessageId(SQLState.UNABLE_TO_UNWRAP),
68                     interfaces).getSQLException();
69         }
70     }
71 }
72
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