Back to index...

	/*
	* Copyright (c) 1997, 2004, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package sun.security.x509;

	import java.io.*;

	import sun.security.util.*;

	/**
	* Represent the GeneralSubtree ASN.1 object, whose syntax is:
	* <pre>
	* GeneralSubtree ::= SEQUENCE {
	* base GeneralName,
	* minimum [0] BaseDistance DEFAULT 0,
	* maximum [1] BaseDistance OPTIONAL
	* }
	* BaseDistance ::= INTEGER (0..MAX)
	* </pre>
	* @author Amit Kapoor
	* @author Hemma Prafullchandra
	*/
	public class GeneralSubtree {
	private static final byte TAG_MIN = 0;
	private static final byte TAG_MAX = 1;
	private static final int MIN_DEFAULT = 0;

	private GeneralName name;
	private int minimum = MIN_DEFAULT;
	private int maximum = -1;

	private int myhash = -1;

	/**
	* The default constructor for the class.
	*
	* @params name the GeneralName
	* @params min the minimum BaseDistance
	* @params max the maximum BaseDistance
	*/
	public GeneralSubtree(GeneralName name, int min, int max) {
	this.name = name;
	this.minimum = min;
	this.maximum = max;
	}

	/**
	* Create the object from its DER encoded form.
	*
	* @param val the DER encoded from of the same.
	*/
	public GeneralSubtree(DerValue val) throws IOException {
	if (val.tag != DerValue.tag_Sequence) {
	throw new IOException("Invalid encoding for GeneralSubtree.");
	}
	name = new GeneralName(val.data.getDerValue(), true);

	// NB. this is always encoded with the IMPLICIT tag
	// The checks only make sense if we assume implicit tagging,
	// with explicit tagging the form is always constructed.
	while (val.data.available() != 0) {
	DerValue opt = val.data.getDerValue();

	if (opt.isContextSpecific(TAG_MIN) && !opt.isConstructed()) {
	opt.resetTag(DerValue.tag_Integer);
	minimum = opt.getInteger();

	} else if (opt.isContextSpecific(TAG_MAX) && !opt.isConstructed()) {
	opt.resetTag(DerValue.tag_Integer);
	maximum = opt.getInteger();
	} else
	throw new IOException("Invalid encoding of GeneralSubtree.");
	}
	}

	/**
	* Return the GeneralName.
	*
	* @return the GeneralName
	*/
	public GeneralName getName() {
	//XXXX May want to consider cloning this
	return name;
	}

	/**
	* Return the minimum BaseDistance.
	*
	* @return the minimum BaseDistance. Default is 0 if not set.
	*/
	public int getMinimum() {
	return minimum;
	}

	/**
	* Return the maximum BaseDistance.
	*
	* @return the maximum BaseDistance, or -1 if not set.
	*/
	public int getMaximum() {
	return maximum;
	}

	/**
	* Return a printable string of the GeneralSubtree.
	*/
	public String toString() {
	String s = "\n GeneralSubtree: [\n" +
	" GeneralName: " + ((name == null) ? "" : name.toString()) +
	"\n Minimum: " + minimum;
	if (maximum == -1) {
	s += "\t Maximum: undefined";
	} else
	s += "\t Maximum: " + maximum;
	s += " ]\n";
	return (s);
	}

	/**
	* Compare this GeneralSubtree with another
	*
	* @param other GeneralSubtree to compare to this
	* @returns true if match
	*/
	public boolean equals(Object other) {
	if (!(other instanceof GeneralSubtree))
	return false;
	GeneralSubtree otherGS = (GeneralSubtree)other;
	if (this.name == null) {
	if (otherGS.name != null) {
	return false;
	}
	} else {
	if (!((this.name).equals(otherGS.name)))
	return false;
	}
	if (this.minimum != otherGS.minimum)
	return false;
	if (this.maximum != otherGS.maximum)
	return false;
	return true;
	}

	/**
	* Returns the hash code for this GeneralSubtree.
	*
	* @return a hash code value.
	*/
	public int hashCode() {
	if (myhash == -1) {
	myhash = 17;
	if (name != null) {
	myhash = 37 * myhash + name.hashCode();
	}
	if (minimum != MIN_DEFAULT) {
	myhash = 37 * myhash + minimum;
	}
	if (maximum != -1) {
	myhash = 37 * myhash + maximum;
	}
	}
	return myhash;
	}

	/**
	* Encode the GeneralSubtree.
	*
	* @params out the DerOutputStream to encode this object to.
	*/
	public void encode(DerOutputStream out) throws IOException {
	DerOutputStream seq = new DerOutputStream();

	name.encode(seq);

	if (minimum != MIN_DEFAULT) {
	DerOutputStream tmp = new DerOutputStream();
	tmp.putInteger(minimum);
	seq.writeImplicit(DerValue.createTag(DerValue.TAG_CONTEXT,
	false, TAG_MIN), tmp);
	}
	if (maximum != -1) {
	DerOutputStream tmp = new DerOutputStream();
	tmp.putInteger(maximum);
	seq.writeImplicit(DerValue.createTag(DerValue.TAG_CONTEXT,
	false, TAG_MAX), tmp);
	}
	out.write(DerValue.tag_Sequence, seq);
	}
	}

Back to index...