asn1anydefinedby.java

来自「一个非常好的ssh客户端实现」· Java 代码 · 共 59 行

/******************************************************************************
 *
 * Copyright (c) 1999-2004 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.io.IOException;

public class ASN1AnyDefinedBy extends ASN1DynamicType {

    private ASN1OID definedById;
    private boolean fallBackToAny = false;

    public ASN1AnyDefinedBy(ASN1OID definedById) {
	this(definedById, false);
    }

    public ASN1AnyDefinedBy(ASN1OID definedById, boolean fallBackToAny) {
	super();
	this.definedById = definedById;
        this.fallBackToAny = fallBackToAny;
    }

    protected ASN1Object bindType(int tag) throws IOException {
	if(definedById.getValue() == null) {
	    throw new IOException("Unresolved ANY DEFINED BY, OID not set");
	}
	Class type = ASN1OIDRegistry.lookupType(definedById);
	if(type == null) {
            if (fallBackToAny)
                type = ASN1Any.class;
            else
                throw new IOException("Unknown member of " + getType() + " (" +
                                      definedById.getString() + ")");
	}
	ASN1Object value = null;
	try {
	    value = (ASN1Object)type.newInstance();
	} catch (Exception e) {
	    throw new IOException("Error decoding " + getType() + ": " +
				  e.getMessage());
	}

	return value;
    }

}