/*
* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package javax.management;
/**
* This class is used by the query building mechanism for isInstanceOf expressions.
* @serial include
*
* @since 1.6
*/
class
InstanceOfQueryExp extends
QueryEval implements
QueryExp {
/* Serial version */
private static final long
serialVersionUID = -1081892073854801359L;
/**
* @serial The {@link StringValueExp} returning the name of the class
* of which selected MBeans should be instances.
*/
private
StringValueExp classNameValue;
/**
* Creates a new InstanceOfExp with a specific class name.
* @param classNameValue The {@link StringValueExp} returning the name of
* the class of which selected MBeans should be instances.
*/
// We are using StringValueExp here to be consistent with other queries,
// although we should actually either use a simple string (the classname)
// or a ValueExp - which would allow more complex queries - like for
// instance evaluating the class name from an AttributeValueExp.
// As it stands - using StringValueExp instead of a simple constant string
// doesn't serve any useful purpose besides offering a consistent
// look & feel.
public
InstanceOfQueryExp(
StringValueExp classNameValue) {
if (
classNameValue == null) {
throw new
IllegalArgumentException("Null class name.");
}
this.
classNameValue =
classNameValue;
}
/**
* Returns the class name.
* @returns The {@link StringValueExp} returning the name of
* the class of which selected MBeans should be instances.
*/
public
StringValueExp getClassNameValue() {
return
classNameValue;
}
/**
* Applies the InstanceOf on a MBean.
*
* @param name The name of the MBean on which the InstanceOf will be applied.
*
* @return True if the MBean specified by the name is instance of the class.
* @exception BadAttributeValueExpException
* @exception InvalidApplicationException
* @exception BadStringOperationException
* @exception BadBinaryOpValueExpException
*/
public boolean
apply(
ObjectName name)
throws
BadStringOperationException,
BadBinaryOpValueExpException,
BadAttributeValueExpException,
InvalidApplicationException {
// Get the class name value
final
StringValueExp val;
try {
val = (
StringValueExp)
classNameValue.
apply(
name);
} catch (
ClassCastException x) {
// Should not happen - unless someone wrongly implemented
// StringValueExp.apply().
final
BadStringOperationException y =
new
BadStringOperationException(
x.
toString());
y.
initCause(
x);
throw
y;
}
// Test whether the MBean is an instance of that class.
try {
return
getMBeanServer().
isInstanceOf(
name,
val.
getValue());
} catch (
InstanceNotFoundException infe) {
return false;
}
}
/**
* Returns a string representation of this InstanceOfQueryExp.
* @return a string representation of this InstanceOfQueryExp.
*/
public
String toString() {
return "InstanceOf " +
classNameValue.
toString();
}
}