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1: /* Provider.java -- Security provider information 2: Copyright (C) 1998, 1999, 2000, 2002 Free Software Foundation, Inc. 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: package java.security; 39: 40: import java.io.Serializable; 41: import java.util.Properties; 42: 43: /** 44: * This class represents a Java security architecture service provider. 45: * The services provided by a such a provider can range from security 46: * algorithms to key generation. 47: * <p> 48: * Providers are installed by name and version number. There is one 49: * standard provider supplied with the class library. This is the 50: * "GNU" provider, which can also be accessed by the alias "SUN" for 51: * compatibility with the JDK. 52: * 53: * @version 0.0 54: * 55: * @author Aaron M. Renn (arenn@urbanophile.com) 56: */ 57: public abstract class Provider extends Properties implements Serializable 58: { 59: private static final long serialVersionUID = -4298000515446427739L; 60: 61: /** 62: * This is a textual description of the provider 63: */ 64: private String info; 65: 66: /** 67: * This is the name of the provider 68: */ 69: private String name; 70: 71: /** 72: * This is the version number of the provider 73: */ 74: private double version; 75: 76: /** 77: * This method initializes a new instance of <code>Provider</code> to have 78: * the specified name, version, and description information. 79: * 80: * @param name The name to assign to this <code>Provider</code>. 81: * @param version The version number for this <code>Provider</code>. 82: * @param info A textual description of this provider. 83: */ 84: protected Provider(String name, double version, String info) 85: { 86: this.name = name; 87: this.version = version; 88: this.info = info; 89: } 90: 91: /** 92: * This method returns the name assigned to this <code>Provider</code>. 93: * 94: * @return The <code>Provider</code>'s name. 95: */ 96: public String getName() 97: { 98: return (name); 99: } 100: 101: /** 102: * This method retunrs the version number of this <code>Provider</code>. 103: * 104: * @return The <code>Provider</code>'s version number. 105: */ 106: public double getVersion() 107: { 108: return (version); 109: } 110: 111: /** 112: * This method returns a textual description of the <code>Provider</code>. 113: * 114: * @return A description of the <code>Provider</code>. 115: */ 116: public String getInfo() 117: { 118: return (info); 119: } 120: 121: /** 122: * Sets the key property to have the specified value. 123: * <p> 124: * <bold>NOT IMPLEMENTED YET</bold>[ 125: * First, if there is a security manager, its <code>checkSecurityAccess</code> 126: * method is called with the string "putProviderProperty."+name, where name is 127: * the provider name, to see if it's ok to set this provider's property 128: * values. 129: * If the default implementation of <code>checkSecurityAccess</code> is used 130: * (that is, that method is not overriden), then this results in a call to the 131: * security manager's <code>checkPermission</code> method with a 132: * <code>SecurityPermission("putProviderProperty."+name)</code> 133: * permission.<br>] 134: * 135: * @param key The property key. 136: * @param value The property value. 137: * 138: * @return The previous value of the specified property (<code>key</code>), 139: * or <code>null</code> if it did not have one. 140: * @throws SecurityException If a security manager exists and its 141: * {@link java.lang.SecurityManager.checkSecurityAccess(java.lang.String)} 142: * method denies access to set property values. 143: * @since Classpath 0.4+cvs, JDK 1.2 144: * @see java.lang.Object.equals(Object) 145: * @see java.util.Hashtable.get(Object) 146: */ 147: public Object put(Object key, Object value) 148: { 149: return super.put(toCanonicalKey(key), value); 150: } 151: 152: // overrides same in java.util.Hashtable 153: public Object get(Object key) 154: { 155: return super.get(toCanonicalKey(key)); 156: } 157: 158: /** 159: * This method removes the specified key entry (and its associated value) 160: * from the property mapping list. 161: * 162: * @param key The key to remove 163: * 164: * @return The previous value for this key, or <code>null</code> if no 165: * previous value. 166: */ 167: public Object remove(Object key) 168: { 169: return super.remove(toCanonicalKey(key)); 170: } 171: 172: /** 173: * This method clears the entire property list such that it no longer 174: * contains the properties used to look up the services provided by 175: * the <code>Provider</code>. 176: */ 177: public void clear() 178: { 179: super.clear(); 180: } 181: 182: /** 183: * This method returns a <code>String</code> representation of this 184: * object. This will include the <code>Provider</code> name and 185: * version number. 186: * 187: * @return A <code>String</code> representation of this object. 188: */ 189: public String toString() 190: { 191: return (getClass().getName() + ": name=" + getName() + " version=" + 192: version); 193: } 194: 195: private Object toCanonicalKey(Object key) 196: { 197: if (key.getClass().isAssignableFrom(String.class)) // is it ours? 198: return ((String) key).toUpperCase(); // use default locale 199: else 200: return key; 201: } 202: }
GNU Classpath (0.20) |