MBeanAttributeMOTableInfo


1   /*_############################################################################
2     _##
3     _##  SNMP4J-AgentJMX - MBeanAttributeMOTableInfo.java
4     _##
5     _##  Copyright (C) 2006-2007  Frank Fock (SNMP4J.org)
6     _##
7     _##  This program is free software; you can redistribute it and/or modify
8     _##  it under the terms of the GNU General Public License version 2 as
9     _##  published by the Free Software Foundation.
10    _##
11    _##  This program is distributed in the hope that it will be useful,
12    _##  but WITHOUT ANY WARRANTY; without even the implied warranty of
13    _##  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14    _##  GNU General Public License for more details.
15    _##
16    _##  You should have received a copy of the GNU General Public License
17    _##  along with this program; if not, write to the Free Software
18    _##  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
19    _##  MA  02110-1301  USA
20    _##
21    _##########################################################################*/
22  
23  package org.snmp4j.agent.mo.jmx;
24  
25  import java.io.IOException  ;
26  import javax.management.*;
27  import org.snmp4j.agent.mo.jmx.types.*;
28  
29  /**
30   * The <code>MBeanAttributeMOTableInfo</code> class describes the mapping from
31   * the attributes of an MBean to a SNMP conceptual table and vice versa.
32   *
33   * @author Frank Fock
34   * @version 1.0
35   */
36  public class MBeanAttributeMOTableInfo extends MBeanMOInfo {
37  
38    private MBeanAttributeKeyProvider keyProvider;
39    private String  [] indexAttributes;
40    private TypedAttribute[] columns;
41    private JMXIndexSupport indexSupport;
42  
43    /**
44     * Creates a table mapping for the supplied MBean name.
45     *
46     * @param name
47     *    the name of the MBean that provides the table data.
48     * @param keyProvider
49     *    a key provider that provides the keys that identify rows in the table.
50     * @param columns
51     *    the attributes that represent the columns of the table.
52     * @param keyAttributes
53     *    the name of the attributes in <code>columns</code> that represent the
54     *    primary key of the row.
55     * @param indexSupport
56     *    provides the mapping between the row keys and their corresponding
57     *    SNMP index values.
58     */
59    public MBeanAttributeMOTableInfo(ObjectName name,
60                                     MBeanAttributeKeyProvider keyProvider,
61                                     TypedAttribute[] columns,
62                                     String  [] keyAttributes,
63                                     JMXIndexSupport indexSupport) {
64      super(name);
65      this.keyProvider = keyProvider;
66      this.indexAttributes = keyAttributes;
67      this.columns = columns;
68      this.indexSupport = indexSupport;
69    }
70  
71    public String  [] getIndexAttributes() {
72      return indexAttributes;
73    }
74  
75    public TypedAttribute[] getColumns() {
76      return columns;
77    }
78  
79    public MBeanAttributeKeyProvider getKeyProvider() {
80      return keyProvider;
81    }
82  
83    public JMXIndexSupport getIndexSupport() {
84      return indexSupport;
85    }
86  
87    public Object   getKey(MBeanServerConnection server, ObjectName row) throws
88        IOException  , ReflectionException, InstanceNotFoundException {
89      Object  [] key = new Object  [indexAttributes.length];
90      AttributeList keyObjects = server.getAttributes(row, indexAttributes);
91      for (int i=0; i<keyObjects.size(); i++) {
92        key[i] = ((Attribute)keyObjects.get(i)).getValue();
93      }
94      if (key.length == 1) {
95        return key[0];
96      }
97      return key;
98    }
99  }
100
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