01: /*
02: * Copyright (c) 1998-2005 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * Resin Open Source is free software; you can redistribute it and/or modify
10: * it under the terms of the GNU General Public License as published by
11: * the Free Software Foundation; either version 2 of the License, or
12: * (at your option) any later version.
13: *
14: * Resin Open Source is distributed in the hope that it will be useful,
15: * but WITHOUT ANY WARRANTY; without even the implied warranty of
16: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17: * of NON-INFRINGEMENT. See the GNU General Public License for more
18: * details.
19: *
20: * You should have received a copy of the GNU General Public License
21: * along with Resin Open Source; if not, write to the
22: * Free SoftwareFoundation, Inc.
23: * 59 Temple Place, Suite 330
24: * Boston, MA 02111-1307 USA
25: *
26: * @author Sam
27: */
28:
29: package com.caucho.jmx;
30:
31: import javax.management.Descriptor;
32: import javax.management.RuntimeOperationsException;
33:
34: public class EmptyDescriptor implements Descriptor {
35: public static final Descriptor EMPTY_DESCRIPTOR = new EmptyDescriptor();
36:
37: private static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];
38: private static final String[] EMPTY_STRING_ARRAY = new String[0];
39:
40: private EmptyDescriptor() {
41: }
42:
43: public Object getFieldValue(String fieldName)
44: throws RuntimeOperationsException {
45: return null;
46: }
47:
48: public void setField(String fieldName, Object fieldValue)
49: throws RuntimeOperationsException {
50: throw new RuntimeOperationsException(
51: new UnsupportedOperationException());
52: }
53:
54: public String[] getFields() {
55: return EMPTY_STRING_ARRAY;
56: }
57:
58: public String[] getFieldNames() {
59: return EMPTY_STRING_ARRAY;
60: }
61:
62: public Object[] getFieldValues(String[] fieldNames) {
63: return EMPTY_OBJECT_ARRAY;
64: }
65:
66: public void removeField(String fieldName) {
67: throw new RuntimeOperationsException(
68: new UnsupportedOperationException());
69: }
70:
71: public void setFields(String[] fieldNames, Object[] fieldValues)
72: throws RuntimeOperationsException {
73: throw new RuntimeOperationsException(
74: new UnsupportedOperationException());
75: }
76:
77: public Object clone() throws RuntimeOperationsException {
78: return this ;
79: }
80:
81: public boolean isValid() throws RuntimeOperationsException {
82: return true;
83: }
84: }
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