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 AttributeValueExp may be used anywhere a
ValueExp is required.
| Constructor and Description |
|---|
AttributeValueExp()
Deprecated.
An instance created with this constructor cannot be
used in a query.
|
AttributeValueExp(String attr)
Creates a new
AttributeValueExp representing the
specified object attribute, named attr. |
| Modifier and Type | Method and Description |
|---|---|
ValueExp |
apply(ObjectName name)
Applies the
AttributeValueExp on an MBean. |
protected Object |
getAttribute(ObjectName name)
Return the value of the given attribute in the named MBean.
|
String |
getAttributeName()
Returns a string representation of the name of the attribute.
|
void |
setMBeanServer(MBeanServer s)
Deprecated.
This method has no effect. The MBean Server used to
obtain an attribute value is
QueryEval.getMBeanServer(). |
String |
toString()
Returns the string representing its value.
|
@Deprecated public AttributeValueExp()
AttributeValueExp with a null attribute.public String getAttributeName()
public ValueExp apply(ObjectName name) throws BadStringOperationException, BadBinaryOpValueExpException, BadAttributeValueExpException, InvalidApplicationException
Applies the AttributeValueExp on an MBean.
This method calls getAttribute(name) and wraps
the result as a ValueExp. The value returned by
getAttribute must be a Number, String,
or Boolean; otherwise this method throws a
BadAttributeValueExpException, which will cause
the containing query to be false for this name.
apply in interface ValueExpname - The name of the MBean on which the AttributeValueExp will be applied.ValueExp.BadAttributeValueExpExceptionInvalidApplicationExceptionBadStringOperationExceptionBadBinaryOpValueExpExceptionpublic String toString()
@Deprecated public void setMBeanServer(MBeanServer s)
QueryEval.getMBeanServer().setMBeanServer in interface ValueExps - The MBean server on which the query is to be performed.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().
name - the name of the MBean whose attribute is to be returned. Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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