/* Provider.java -- Security provider information   Copyright (C) 1998, 1999, 2000, 2002 Free Software Foundation, Inc.This file is part of GNU Classpath.GNU Classpath is free software; you can redistribute it and/or modifyit under the terms of the GNU General Public License as published bythe Free Software Foundation; either version 2, or (at your option)any later version.GNU Classpath is distributed in the hope that it will be useful, butWITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNUGeneral Public License for more details.You should have received a copy of the GNU General Public Licensealong with GNU Classpath; see the file COPYING.  If not, write to theFree Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA02110-1301 USA.Linking this library statically or dynamically with other modules ismaking a combined work based on this library.  Thus, the terms andconditions of the GNU General Public License cover the wholecombination.As a special exception, the copyright holders of this library give youpermission to link this library with independent modules to produce anexecutable, regardless of the license terms of these independentmodules, and to copy and distribute the resulting executable underterms of your choice, provided that you also meet, for each linkedindependent module, the terms and conditions of the license of thatmodule.  An independent module is a module which is not derived fromor based on this library.  If you modify this library, you may extendthis exception to your version of the library, but you are notobligated to do so.  If you do not wish to do so, delete thisexception statement from your version. */package java.security;import java.io.Serializable;import java.util.Properties;/** * This class represents a Java security architecture service provider. * The services provided by a such a provider can range from security * algorithms to key generation. * <p> * Providers are installed by name and version number.  There is one * standard provider supplied with the class library.  This is the * "GNU" provider, which can also be accessed by the alias "SUN" for * compatibility with the JDK. * * @version 0.0 * * @author Aaron M. Renn (arenn@urbanophile.com) */public abstract class Provider extends Properties implements Serializable{  private static final long serialVersionUID = -4298000515446427739L;  /**   * This is a textual description of the provider   */  private String info;  /**   * This is the name of the provider   */  private String name;  /**   * This is the version number of the provider   */  private double version;  /**   * This method initializes a new instance of <code>Provider</code> to have   * the specified name, version, and description information.   *   * @param name The name to assign to this <code>Provider</code>.   * @param version The version number for this <code>Provider</code>.   * @param info A textual description of this provider.   */  protected Provider(String name, double version, String info)  {    this.name = name;    this.version = version;    this.info = info;  }  /**   * This method returns the name assigned to this <code>Provider</code>.   *   * @return The <code>Provider</code>'s name.   */  public String getName()  {    return (name);  }  /**   * This method retunrs the version number of this <code>Provider</code>.   *    * @return The <code>Provider</code>'s version number.   */  public double getVersion()  {    return (version);  }  /**   * This method returns a textual description of the <code>Provider</code>.   *   * @return A description of the <code>Provider</code>.   */  public String getInfo()  {    return (info);  }  /**   * Sets the key property to have the specified value.   * <p>   * <bold>NOT IMPLEMENTED YET</bold>[   * First, if there is a security manager, its <code>checkSecurityAccess</code>   * method is called with the string "putProviderProperty."+name, where name is   * the provider name, to see if it's ok to set this provider's property   * values.   * If the default implementation of <code>checkSecurityAccess</code> is used   * (that is, that method is not overriden), then this results in a call to the   * security manager's <code>checkPermission</code> method with a   * <code>SecurityPermission("putProviderProperty."+name)</code>   * permission.<br>]   *   * @param key The property key.   * @param value The property value.   *   * @return The previous value of the specified property (<code>key</code>),   *         or <code>null</code> if it did not have one.   * @throws SecurityException If a security manager exists and its   * {@link java.lang.SecurityManager.checkSecurityAccess(java.lang.String)}   * method denies access to set property values.   * @since Classpath 0.4+cvs, JDK 1.2   * @see java.lang.Object.equals(Object)   * @see java.util.Hashtable.get(Object)   */  public Object put(Object key, Object value)  {    return super.put(toCanonicalKey(key), value);  }    // overrides same in java.util.Hashtable  public Object get(Object key)  {    return super.get(toCanonicalKey(key));  }  /**   * This method removes the specified key entry (and its associated value)   * from the property mapping list.   *    * @param key The key to remove   *   * @return The previous value for this key, or <code>null</code> if no   * previous value.   */  public Object remove(Object key)  {    return super.remove(toCanonicalKey(key));  }  /**   * This method clears the entire property list such that it no longer   * contains the properties used to look up the services provided by   * the <code>Provider</code>.   */  public void clear()  {    super.clear();  }  /**   * This method returns a <code>String</code> representation of this   * object.  This will include the <code>Provider</code> name and   * version number.   *   * @return A <code>String</code> representation of this object.   */  public String toString()  {    return (getClass().getName() + ": name=" + getName() + " version=" +	    version);  }    private Object toCanonicalKey(Object key)  {    if (key.getClass().isAssignableFrom(String.class)) // is it ours?      return ((String) key).toUpperCase(); // use default locale    else      return key;  }}