/*
* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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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();
}
}