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