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jeremybenn |
/* OpenMBeanInfoSupport.java -- Open typed info about a bean.
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Copyright (C) 2006 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.management.openmbean;
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import java.util.Arrays;
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import java.util.HashSet;
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import javax.management.MBeanInfo;
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import javax.management.MBeanAttributeInfo;
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import javax.management.MBeanConstructorInfo;
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import javax.management.MBeanNotificationInfo;
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import javax.management.MBeanOperationInfo;
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/**
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* Describes an open management bean.
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*
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* @author Andrew John Hughes (gnu_andrew@member.fsf.org)
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* @since 1.5
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*/
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public class OpenMBeanInfoSupport
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extends MBeanInfo
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implements OpenMBeanInfo
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{
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/**
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* Compatible with JDK 1.5
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*/
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private static final long serialVersionUID = 4349395935420511492L;
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/**
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* The hash code of this instance.
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*/
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private transient Integer hashCode;
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/**
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* The <code>toString()</code> result of this instance.
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*/
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private transient String string;
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/**
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* Constructs a new {@link OpenMBeanInfo} using the supplied
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* class name and description with the given attributes,
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* operations, constructors and notifications. The class
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* name does not have to actually specify a valid class that
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* can be loaded by the MBean server or class loader; it merely
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* has to be a syntactically correct class name. Any of the
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* arrays may be <code>null</code>; this will be treated as if
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* an empty array was supplied. A copy of the arrays is
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* taken, so later changes have no effect.
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*
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* @param name the name of the class this instance describes.
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* @param desc a description of the bean.
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* @param attribs the attribute descriptions for the bean,
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* or <code>null</code>.
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* @param cons the constructor descriptions for the bean,
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* or <code>null</code>.
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* @param ops the operation descriptions for the bean,
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* or <code>null</code>.
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* @param notifs the notification descriptions for the bean,
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* or <code>null</code>.
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* @throws ArrayStoreException if a members of an array
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* is not assignable to the equivalent
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* <code>MBeanXXXInfo</code> class.
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*/
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public OpenMBeanInfoSupport(String name, String desc,
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OpenMBeanAttributeInfo[] attribs,
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OpenMBeanConstructorInfo[] cons,
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OpenMBeanOperationInfo[] ops,
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MBeanNotificationInfo[] notifs)
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{
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super(name, desc, (MBeanAttributeInfo[]) attribs,
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(MBeanConstructorInfo[]) cons,
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(MBeanOperationInfo[]) ops,
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notifs);
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}
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/**
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* Compares this attribute with the supplied object. This returns
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* true iff the object is an instance of {@link OpenMBeanInfo}
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* with the same class name and equal instances of the info classes.
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*
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* @param obj the object to compare.
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* @return true if the object is a {@link OpenMBeanInfo}
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* instance,
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* <code>className.equals(object.getClassName())</code>
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* and each info class has an equal in the other object.
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*/
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public boolean equals(Object obj)
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{
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if (!(obj instanceof OpenMBeanInfo))
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return false;
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OpenMBeanInfo o = (OpenMBeanInfo) obj;
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return getClassName().equals(o.getClassName()) &&
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getAttributes().equals(o.getAttributes()) &&
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getConstructors().equals(o.getConstructors()) &&
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getNotifications().equals(o.getNotifications()) &&
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getOperations().equals(o.getOperations());
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}
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/**
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* <p>
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* Returns the hashcode of the bean information as the sum of the
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* hashcodes of the class name and each array (calculated using
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* java.util.HashSet(<code>java.util.Arrays.asList(signature)).hashCode()</code>).
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* </p>
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* <p>
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* As instances of this class are immutable, the return value
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* is computed just once for each instance and reused
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* throughout its life.
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* </p>
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*
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* @return the hashcode of the bean information.
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*/
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public int hashCode()
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{
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if (hashCode == null)
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hashCode =
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Integer.valueOf(getClassName().hashCode() +
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new HashSet<MBeanAttributeInfo>(Arrays.asList(getAttributes())).hashCode() +
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new HashSet<MBeanConstructorInfo>(Arrays.asList(getConstructors())).hashCode() +
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new HashSet<MBeanNotificationInfo>(Arrays.asList(getNotifications())).hashCode() +
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new HashSet<MBeanOperationInfo>(Arrays.asList(getOperations())).hashCode());
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return hashCode.intValue();
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}
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/**
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* <p>
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* Returns a textual representation of this instance. This
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* is constructed using the class name
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* (<code>javax.management.openmbean.OpenMBeanInfo</code>)
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* along with the class name and textual representations
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* of each array.
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* </p>
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* <p>
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* As instances of this class are immutable, the return value
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* is computed just once for each instance and reused
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* throughout its life.
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* </p>
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*
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* @return a @link{java.lang.String} instance representing
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* the instance in textual form.
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*/
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public String toString()
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{
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if (string == null)
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string = getClass().getName()
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+ "[className=" + getClassName()
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+ ",attributes=" + Arrays.toString(getAttributes())
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+ ",constructors=" + Arrays.toString(getConstructors())
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+ ",notifications=" + Arrays.toString(getNotifications())
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+ ",operations=" + Arrays.toString(getOperations())
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+ "]";
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return string;
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}
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}
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