| /* |
| * 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 |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| 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. |
| * @return 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(); |
| } |
| } |