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/*
* 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);
}
}
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