QualifiedAttributeValueExp


1   /*
2    * @(#)QualifiedAttributeValueExp.java  4.18 03/12/19
3    * 
4    * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
5    * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
6    */
7   
8   package javax.management;
9   
10  
11  /**
12   * This class represents indexed attributes used as arguments to relational
13   * constraints. An QualifiedAttributeValueExp may be used anywhere a
14   * ValueExp is required.
15   * @serial include
16   *
17   * @since 1.5
18   */
19  class QualifiedAttributeValueExp extends AttributeValueExp     { 
20  
21  
22      /* Serial version */
23      private static final long serialVersionUID = 8832517277410933254L;
24  
25      /**
26       * @serial The attribute class name
27       */
28      private String   className;
29          
30  
31      /**
32       * Basic Constructor.
33       */
34      public QualifiedAttributeValueExp() { 
35      } 
36  
37      /**
38       * Creates a new QualifiedAttributeValueExp representing the specified object
39       * attribute, named attr with class name className.
40       */
41      public QualifiedAttributeValueExp(String   className, String   attr) { 
42      super(attr);
43      this.className = className;
44      } 
45  
46  
47      /**
48       * Returns a string representation of the class name of the attribute.
49       */
50      public String   getAttrClassName()  { 
51      return className;
52      } 
53  
54      /**
55       * Applies the QualifiedAttributeValueExp to an MBean.
56       *
57       * @param name The name of the MBean on which the QualifiedAttributeValueExp will be applied.
58       *
59       * @return  The ValueExp.
60       *
61       * @exception BadStringOperationException
62       * @exception BadBinaryOpValueExpException
63       * @exception BadAttributeValueExpException 
64       * @exception InvalidApplicationException
65       */
66      public ValueExp   apply(ObjectName   name) throws BadStringOperationException  , BadBinaryOpValueExpException  ,
67      BadAttributeValueExpException  , InvalidApplicationException    {
68      try {
69          MBeanServer   server = QueryEval.getMBeanServer();
70          String   v = server.getObjectInstance(name).getClassName();
71          
72          if (v.equals(className)) {
73          return super.apply(name);
74          }
75          throw new InvalidApplicationException  ("Class name is " + v +
76                            ", should be " + className);
77          
78      } catch (Exception   e) {
79          throw new InvalidApplicationException  ("Qualified attribute: " + e);
80          /* Can happen if MBean disappears between the time we
81             construct the list of MBeans to query and the time we
82             evaluate the query on this MBean, or if
83             getObjectInstance throws SecurityException.  */
84      }
85      } 
86      
87      /**
88       * Returns the string representing its value
89       */        
90      public String   toString()  { 
91      if (className != null) {
92          return className + "." + super.toString();
93      } else {
94          return super.toString();
95      }
96      } 
97      
98  }
99
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