JDK8/Java8源码在线阅读

/*
 * Copyright (c) 1999, 2008, 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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 * questions.
 */

package javax.management;


/**
 * <p>Represents attributes used as arguments to relational constraints,
 * where the attribute must be in an MBean of a specified {@linkplain
 * MBeanInfo#getClassName() class}. A QualifiedAttributeValueExp may be used
 * anywhere a ValueExp is required.
 *
 * @serial include
 *
 * @since 1.5
 */
class QualifiedAttributeValueExp extends AttributeValueExp   {


    /* Serial version */
    private static final long serialVersionUID = 8832517277410933254L;

    /**
     * @serial The attribute class name
     */
    private String className;


    /**
     * Basic Constructor.
     * @deprecated see {@link AttributeValueExp#AttributeValueExp()}
     */
    @Deprecated
    public QualifiedAttributeValueExp() {
    }

    /**
     * Creates a new QualifiedAttributeValueExp representing the specified object
     * attribute, named attr with class name className.
     */
    public QualifiedAttributeValueExp(String className, String attr) {
        super(attr);
        this.className = className;
    }


    /**
     * Returns a string representation of the class name of the attribute.
     */
    public String getAttrClassName()  {
        return className;
    }

    /**
     * Applies the QualifiedAttributeValueExp to an MBean.
     *
     * @param name The name of the MBean on which the QualifiedAttributeValueExp will be applied.
     *
     * @return  The ValueExp.
     *
     * @exception BadStringOperationException
     * @exception BadBinaryOpValueExpException
     * @exception BadAttributeValueExpException
     * @exception InvalidApplicationException
     */
    @Override
    public ValueExp apply(ObjectName name) throws BadStringOperationException, BadBinaryOpValueExpException,
        BadAttributeValueExpException, InvalidApplicationException  {
        try {
            MBeanServer server = QueryEval.getMBeanServer();
            String v = server.getObjectInstance(name).getClassName();

            if (v.equals(className)) {
                return super.apply(name);
            }
            throw new InvalidApplicationException("Class name is " + v +
                                                  ", should be " + className);

        } catch (Exception e) {
            throw new InvalidApplicationException("Qualified attribute: " + e);
            /* Can happen if MBean disappears between the time we
               construct the list of MBeans to query and the time we

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