001/* OpenMBeanInfoSupport.java -- Open typed info about a bean. 002 Copyright (C) 2006 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038package javax.management.openmbean; 039 040import java.util.Arrays; 041import java.util.HashSet; 042 043import javax.management.MBeanInfo; 044import javax.management.MBeanAttributeInfo; 045import javax.management.MBeanConstructorInfo; 046import javax.management.MBeanNotificationInfo; 047import javax.management.MBeanOperationInfo; 048 049/** 050 * Describes an open management bean. 051 * 052 * @author Andrew John Hughes (gnu_andrew@member.fsf.org) 053 * @since 1.5 054 */ 055public class OpenMBeanInfoSupport 056 extends MBeanInfo 057 implements OpenMBeanInfo 058{ 059 060 /** 061 * Compatible with JDK 1.5 062 */ 063 private static final long serialVersionUID = 4349395935420511492L; 064 065 /** 066 * The hash code of this instance. 067 */ 068 private transient Integer hashCode; 069 070 /** 071 * The <code>toString()</code> result of this instance. 072 */ 073 private transient String string; 074 075 /** 076 * Constructs a new {@link OpenMBeanInfo} using the supplied 077 * class name and description with the given attributes, 078 * operations, constructors and notifications. The class 079 * name does not have to actually specify a valid class that 080 * can be loaded by the MBean server or class loader; it merely 081 * has to be a syntactically correct class name. Any of the 082 * arrays may be <code>null</code>; this will be treated as if 083 * an empty array was supplied. A copy of the arrays is 084 * taken, so later changes have no effect. 085 * 086 * @param name the name of the class this instance describes. 087 * @param desc a description of the bean. 088 * @param attribs the attribute descriptions for the bean, 089 * or <code>null</code>. 090 * @param cons the constructor descriptions for the bean, 091 * or <code>null</code>. 092 * @param ops the operation descriptions for the bean, 093 * or <code>null</code>. 094 * @param notifs the notification descriptions for the bean, 095 * or <code>null</code>. 096 * @throws ArrayStoreException if a members of an array 097 * is not assignable to the equivalent 098 * <code>MBeanXXXInfo</code> class. 099 */ 100 public OpenMBeanInfoSupport(String name, String desc, 101 OpenMBeanAttributeInfo[] attribs, 102 OpenMBeanConstructorInfo[] cons, 103 OpenMBeanOperationInfo[] ops, 104 MBeanNotificationInfo[] notifs) 105 { 106 super(name, desc, (MBeanAttributeInfo[]) attribs, 107 (MBeanConstructorInfo[]) cons, 108 (MBeanOperationInfo[]) ops, 109 notifs); 110 } 111 112 /** 113 * Compares this attribute with the supplied object. This returns 114 * true iff the object is an instance of {@link OpenMBeanInfo} 115 * with the same class name and equal instances of the info classes. 116 * 117 * @param obj the object to compare. 118 * @return true if the object is a {@link OpenMBeanInfo} 119 * instance, 120 * <code>className.equals(object.getClassName())</code> 121 * and each info class has an equal in the other object. 122 */ 123 public boolean equals(Object obj) 124 { 125 if (!(obj instanceof OpenMBeanInfo)) 126 return false; 127 OpenMBeanInfo o = (OpenMBeanInfo) obj; 128 return getClassName().equals(o.getClassName()) && 129 getAttributes().equals(o.getAttributes()) && 130 getConstructors().equals(o.getConstructors()) && 131 getNotifications().equals(o.getNotifications()) && 132 getOperations().equals(o.getOperations()); 133 } 134 135 /** 136 * <p> 137 * Returns the hashcode of the bean information as the sum of the 138 * hashcodes of the class name and each array (calculated using 139 * java.util.HashSet(<code>java.util.Arrays.asList(signature)).hashCode()</code>). 140 * </p> 141 * <p> 142 * As instances of this class are immutable, the return value 143 * is computed just once for each instance and reused 144 * throughout its life. 145 * </p> 146 * 147 * @return the hashcode of the bean information. 148 */ 149 public int hashCode() 150 { 151 if (hashCode == null) 152 hashCode = 153 Integer.valueOf(getClassName().hashCode() + 154 new HashSet<MBeanAttributeInfo>(Arrays.asList(getAttributes())).hashCode() + 155 new HashSet<MBeanConstructorInfo>(Arrays.asList(getConstructors())).hashCode() + 156 new HashSet<MBeanNotificationInfo>(Arrays.asList(getNotifications())).hashCode() + 157 new HashSet<MBeanOperationInfo>(Arrays.asList(getOperations())).hashCode()); 158 return hashCode.intValue(); 159 } 160 161 /** 162 * <p> 163 * Returns a textual representation of this instance. This 164 * is constructed using the class name 165 * (<code>javax.management.openmbean.OpenMBeanInfo</code>) 166 * along with the class name and textual representations 167 * of each array. 168 * </p> 169 * <p> 170 * As instances of this class are immutable, the return value 171 * is computed just once for each instance and reused 172 * throughout its life. 173 * </p> 174 * 175 * @return a @link{java.lang.String} instance representing 176 * the instance in textual form. 177 */ 178 public String toString() 179 { 180 if (string == null) 181 string = getClass().getName() 182 + "[className=" + getClassName() 183 + ",attributes=" + Arrays.toString(getAttributes()) 184 + ",constructors=" + Arrays.toString(getConstructors()) 185 + ",notifications=" + Arrays.toString(getNotifications()) 186 + ",operations=" + Arrays.toString(getOperations()) 187 + "]"; 188 return string; 189 } 190 191}