Class AttributeValueExp
- java.lang.Object
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- javax.management.AttributeValueExp
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- All Implemented Interfaces:
- Serializable, ValueExp
public class AttributeValueExp extends Object implements ValueExp
Represents attributes used as arguments to relational constraints. Instances of this class are usually obtained using
Query.attr.An
AttributeValueExpmay be used anywhere aValueExpis required.- Since:
- 1.5
- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor and Description AttributeValueExp()Deprecated.An instance created with this constructor cannot be used in a query.AttributeValueExp(String attr)Creates a newAttributeValueExprepresenting the specified object attribute, named attr.
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Method Summary
All Methods Instance Methods Concrete Methods Deprecated Methods Modifier and Type Method and Description ValueExpapply(ObjectName name)Applies theAttributeValueExpon an MBean.protected ObjectgetAttribute(ObjectName name)Return the value of the given attribute in the named MBean.StringgetAttributeName()Returns a string representation of the name of the attribute.voidsetMBeanServer(MBeanServer s)Deprecated.This method has no effect. The MBean Server used to obtain an attribute value isQueryEval.getMBeanServer().StringtoString()Returns the string representing its value.
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Constructor Detail
AttributeValueExp
@Deprecated public AttributeValueExp()
Deprecated. An instance created with this constructor cannot be used in a query.AnAttributeValueExpwith a null attribute.
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Method Detail
getAttributeName
public String getAttributeName()
Returns a string representation of the name of the attribute.- Returns:
- the attribute name.
apply
public ValueExp apply(ObjectName name) throws BadStringOperationException, BadBinaryOpValueExpException, BadAttributeValueExpException, InvalidApplicationException
Applies the
AttributeValueExpon an MBean. This method callsgetAttribute(name)and wraps the result as aValueExp. The value returned bygetAttributemust be aNumber,String, orBoolean; otherwise this method throws aBadAttributeValueExpException, which will cause the containing query to be false for thisname.- Specified by:
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applyin interfaceValueExp - Parameters:
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name- The name of the MBean on which theAttributeValueExpwill be applied. - Returns:
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The
ValueExp. - Throws:
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BadAttributeValueExpException -
InvalidApplicationException -
BadStringOperationException -
BadBinaryOpValueExpException
toString
public String toString()
Returns the string representing its value.
setMBeanServer
@Deprecated public void setMBeanServer(MBeanServer s)
Deprecated. This method has no effect. The MBean Server used to obtain an attribute value isQueryEval.getMBeanServer().Sets the MBean server on which the query is to be performed.- Specified by:
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setMBeanServerin interfaceValueExp - Parameters:
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s- The MBean server on which the query is to be performed.
getAttribute
protected Object getAttribute(ObjectName name)
Return the value of the given attribute in the named MBean. If the attempt to access the attribute generates an exception, return null.
The MBean Server used is the one returned by
QueryEval.getMBeanServer().- Parameters:
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name- the name of the MBean whose attribute is to be returned. - Returns:
- the value of the attribute, or null if it could not be obtained.
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