01: /*
02:
03: Derby - Class org.apache.derby.client.am.ColumnMetaData40
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.client.am;
23:
24: import java.sql.SQLException;
25: import org.apache.derby.shared.common.reference.SQLState;
26:
27: public class ColumnMetaData40 extends ColumnMetaData {
28: /**
29: * Calls the superclass constructor to pass the parameters
30: * @param logWriter LogWriter
31: */
32: public ColumnMetaData40(LogWriter logWriter) {
33: super (logWriter);
34: }
35:
36: /**
37: * Calls the superclass constructor to pass the parameters
38: * @param logWriter LogWriter
39: * @param upperBound int
40: */
41: public ColumnMetaData40(LogWriter logWriter, int upperBound) {
42: super (logWriter, upperBound);
43: }
44:
45: /**
46: * Returns false unless <code>interfaces</code> is implemented
47: *
48: * @param interfaces a Class defining an interface.
49: * @return true if this implements the interface or
50: * directly or indirectly wraps an object
51: * that does.
52: * @throws java.sql.SQLException if an error occurs while determining
53: * whether this is a wrapper for an object
54: * with the given interface.
55: */
56: public boolean isWrapperFor(Class<?> interfaces)
57: throws SQLException {
58: return interfaces.isInstance(this );
59: }
60:
61: /**
62: * Returns <code>this</code> if this class implements the interface
63: *
64: * @param interfaces a Class defining an interface
65: * @return an object that implements the interface
66: * @throws java.sql.SQLExption if no object if found that implements the
67: * interface
68: */
69: public <T> T unwrap(java.lang.Class<T> interfaces)
70: throws SQLException {
71: try {
72: return interfaces.cast(this );
73: } catch (ClassCastException cce) {
74: throw new SqlException(null, new ClientMessageId(
75: SQLState.UNABLE_TO_UNWRAP), interfaces)
76: .getSQLException();
77: }
78: }
79: }
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