asn1oidregistry.java

来自「一个非常好的ssh客户端实现」· Java 代码 · 共 105 行

/******************************************************************************
 *
 * Copyright (c) 1999-2003 AppGate Network Security AB. All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code as
 * defined in and that are subject to the MindTerm Public Source License,
 * Version 2.0, (the 'License'). You may not use this file except in compliance
 * with the License.
 * 
 * You should have received a copy of the MindTerm Public Source License
 * along with this software; see the file LICENSE.  If not, write to
 * AppGate Network Security AB, Otterhallegatan 2, SE-41118 Goteborg, SWEDEN
 *
 *****************************************************************************/

package com.mindbright.asn1;

import java.util.Properties;
import java.util.Hashtable;
import java.util.Enumeration;

public class ASN1OIDRegistry extends Properties {

    private static ASN1OIDRegistry registry = new ASN1OIDRegistry();
    private static Hashtable       modules  = new Hashtable();

    public void putName(String oid, String name, String shortName) {
	putName(oid, name);
	putShortName(oid, shortName);
    }

    public void putShortName(String oid, String shortName) {
	put("shortname." + oid, shortName);
	put("shortname." + shortName, oid);
    }

    public void putName(String oid, String name) {
	put("name." + oid, name);
	put("name." + name, oid);
    }

    public static synchronized Class lookupType(ASN1OID oid) {
	String id       = oid.getString();
	String type     = registry.getProperty(id);
	Class  typeImpl = null;
	if(type != null) {
	    if(type.indexOf('.') == -1) {
		type = "com.mindbright.asn1." + type;
	    }
	    try {
		typeImpl = Class.forName(type);
	    } catch (ClassNotFoundException e) {
		throw new Error("Can't find class '" + type +
				"' registered in ASN1OIDRegistry with '" +
				id + "'");
	    }
	}
	return typeImpl;
    }

    public static synchronized String lookupName(String id) {
	id = "name." + id;
	return registry.getProperty(id);
    }

    public static synchronized String lookupShortName(String id) {
	id = "shortname." + id;
	return registry.getProperty(id);
    }

    public static void register(ASN1OID oid, String type) {
	register(oid.getString(), type);
    }

    public static synchronized void register(String oid, String type) {
	registry.put(oid, type);
    }

    public static void addModule(String moduleName) {
	// !!! TODO circular references will loop !!!
	try {
	    ASN1OIDRegistry registeredTypes = (ASN1OIDRegistry)
		Class.forName(moduleName + ".RegisteredTypes").newInstance();
	    addModule(moduleName, registeredTypes);
	} catch (Exception e) {
	    throw new Error("In ASN1OIDRegistry: " + e.getMessage());
	}
    }

    public static void addModule(String moduleName, Properties moduleTypes) {
	// !!! OUCH synchronization
	if(modules.get(moduleName) != null) {
	    /* already added... */
	    return;
	}
	modules.put(moduleName, moduleTypes);
	Enumeration e = moduleTypes.propertyNames();
	while(e.hasMoreElements()) {
	    String key = (String)e.nextElement();
	    register(key, moduleTypes.getProperty(key));
	}
    }

}