01: /*
02:
03: Derby - Class org.apache.derby.impl.jdbc.EmbedParametertMetaData40
04:
05: Licensed to the Apache Software Foundation (ASF) under one or more
06: contributor license agreements. See the NOTICE file distributed with
07: this work for additional information regarding copyright ownership.
08: The ASF licenses this file to you under the Apache License, Version 2.0
09: (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.impl.jdbc;
23:
24: import java.sql.SQLException;
25: import org.apache.derby.iapi.reference.SQLState;
26: import org.apache.derby.iapi.sql.ParameterValueSet;
27: import org.apache.derby.iapi.types.DataTypeDescriptor;
28:
29: public class EmbedParameterMetaData40 extends EmbedParameterMetaData30 {
30:
31: /**
32: * Calls the superclass constructors with the parameters passed
33: *
34: * @param pvs ParameterValueSet pvs
35: * @param types DataTypeDescriptor
36: */
37: protected EmbedParameterMetaData40(ParameterValueSet pvs,
38: DataTypeDescriptor[] types) {
39: super (pvs, types);
40: }
41:
42: /**
43: * Returns false unless <code>interfaces</code> is implemented
44: *
45: * @param interfaces a Class defining an interface.
46: * @return true if this implements the interface or
47: * directly or indirectly wraps an object
48: * that does.
49: * @throws java.sql.SQLException if an error occurs while determining
50: * whether this is a wrapper for an object
51: * with the given interface.
52: */
53: public boolean isWrapperFor(Class<?> interfaces)
54: throws SQLException {
55: return interfaces.isInstance(this );
56: }
57:
58: /**
59: * Returns <code>this</code> if this class implements the interface
60: *
61: * @param interfaces a Class defining an interface
62: * @return an object that implements the interface
63: * @throws java.sql.SQLExption if no object if found that implements the
64: * interface
65: */
66: public <T> T unwrap(java.lang.Class<T> interfaces)
67: throws SQLException {
68: //Derby does not implement non-standard methods on
69: //JDBC objects
70: //hence return this if this class implements the interface
71: //or throw an SQLException
72: try {
73: return interfaces.cast(this );
74: } catch (ClassCastException cce) {
75: throw Util.generateCsSQLException(
76: SQLState.UNABLE_TO_UNWRAP, interfaces);
77: }
78: }
79: }
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