001 /* OpenMBeanConstructorInfoSupport.java -- Open typed info about an constructor. 002 Copyright (C) 2006 Free Software Foundation, Inc. 003 004 This file is part of GNU Classpath. 005 006 GNU Classpath is free software; you can redistribute it and/or modify 007 it under the terms of the GNU General Public License as published by 008 the Free Software Foundation; either version 2, or (at your option) 009 any later version. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 019 02110-1301 USA. 020 021 Linking this library statically or dynamically with other modules is 022 making a combined work based on this library. Thus, the terms and 023 conditions of the GNU General Public License cover the whole 024 combination. 025 026 As a special exception, the copyright holders of this library give you 027 permission to link this library with independent modules to produce an 028 executable, regardless of the license terms of these independent 029 modules, and to copy and distribute the resulting executable under 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 036 exception statement from your version. */ 037 038 package javax.management.openmbean; 039 040 import java.util.Arrays; 041 042 import javax.management.MBeanConstructorInfo; 043 import javax.management.MBeanParameterInfo; 044 045 /** 046 * Describes a constructor for an open management bean. 047 * 048 * @author Andrew John Hughes (gnu_andrew@member.fsf.org) 049 * @since 1.5 050 */ 051 public class OpenMBeanConstructorInfoSupport 052 extends MBeanConstructorInfo 053 implements OpenMBeanConstructorInfo 054 { 055 056 /** 057 * Compatible with JDK 1.5 058 */ 059 private static final long serialVersionUID = -4400441579007477003L; 060 061 /** 062 * The hash code of this instance. 063 */ 064 private transient Integer hashCode; 065 066 /** 067 * The <code>toString()</code> result of this instance. 068 */ 069 private transient String string; 070 071 /** 072 * Constructs a @link{OpenMBeanConstructorInfo} with the specified 073 * name, description and parameter information. A <code>null</code> 074 * value for the parameter information is the same as passing in 075 * an empty array. Neither the name nor the description may be 076 * null or equal to the empty string. A copy of the parameter array 077 * is taken, so later changes have no effect. 078 * 079 * @param name the name of the constructor. 080 * @param desc a description of the constructor. 081 * @param sig the signature of the constructor, as a series 082 * of {@link MBeanParameterInfo} objects, one for 083 * each parameter. 084 * @throws IllegalArgumentException if the name or description is 085 * either <code>null</code> 086 * or the empty string. 087 * @throws ArrayStoreException if the members of the signature array 088 * are not assignable to 089 * {@link javax.management.MBeanParameterInfo} 090 */ 091 public OpenMBeanConstructorInfoSupport(String name, String desc, 092 OpenMBeanParameterInfo[] sig) 093 { 094 super(name, desc, (MBeanParameterInfo[]) sig); 095 if (name == null) 096 throw new IllegalArgumentException("The name may not be null."); 097 if (desc == null) 098 throw new IllegalArgumentException("The description may not be null."); 099 if (name.length() == 0) 100 throw new IllegalArgumentException("The name may not be the empty string."); 101 if (desc.length() == 0) 102 throw new IllegalArgumentException("The description may not be the " + 103 "empty string."); 104 } 105 106 /** 107 * Compares this attribute with the supplied object. This returns 108 * true iff the object is an instance of {@link OpenMBeanConstructorInfo} 109 * with an equal name and signature. 110 * 111 * @param obj the object to compare. 112 * @return true if the object is a {@link OpenMBeanParameterInfo} 113 * instance, 114 * <code>name.equals(object.getName())</code>, 115 * and <code>signature.equals(object.getSignature())</code>. 116 */ 117 public boolean equals(Object obj) 118 { 119 if (!(obj instanceof OpenMBeanConstructorInfo)) 120 return false; 121 OpenMBeanConstructorInfo o = (OpenMBeanConstructorInfo) obj; 122 return getName().equals(o.getName()) && 123 getSignature().equals(o.getSignature()); 124 } 125 126 /** 127 * <p> 128 * Returns the hashcode of the constructor information as the sum of 129 * the hashcodes of the name and signature (calculated by 130 * <code>java.util.Arrays.asList(signature).hashCode()</code>). 131 * </p> 132 * <p> 133 * As instances of this class are immutable, the return value 134 * is computed just once for each instance and reused 135 * throughout its life. 136 * </p> 137 * 138 * @return the hashcode of the constructor information. 139 */ 140 public int hashCode() 141 { 142 if (hashCode == null) 143 hashCode = Integer.valueOf(getName().hashCode() + 144 Arrays.asList(getSignature()).hashCode()); 145 return hashCode.intValue(); 146 } 147 148 /** 149 * <p> 150 * Returns a textual representation of this instance. This 151 * is constructed using the class name 152 * (<code>javax.management.openmbean.OpenMBeanConstructorInfo</code>) 153 * along with the name and signature. 154 * </p> 155 * <p> 156 * As instances of this class are immutable, the return value 157 * is computed just once for each instance and reused 158 * throughout its life. 159 * </p> 160 * 161 * @return a @link{java.lang.String} instance representing 162 * the instance in textual form. 163 */ 164 public String toString() 165 { 166 if (string == null) 167 string = getClass().getName() 168 + "[name=" + getName() 169 + ",signature=" + Arrays.toString(getSignature()) 170 + "]"; 171 return string; 172 } 173 174 }