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	/*
	* Copyright (c) 1997, 2019, 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.pkcs10;

	import java.io.IOException;
	import java.io.OutputStream;
	import java.security.cert.CertificateException;
	import java.util.Collection;
	import java.util.Collections;
	import java.util.Enumeration;
	import java.util.Hashtable;

	import sun.security.util.*;

	/**
	* This class defines the PKCS10 attributes for the request.
	* The ASN.1 syntax for this is:
	* <pre>
	* Attributes ::= SET OF Attribute
	* </pre>
	*
	* @author Amit Kapoor
	* @author Hemma Prafullchandra
	* @see PKCS10
	* @see PKCS10Attribute
	*/
	public class PKCS10Attributes implements DerEncoder {

	private Hashtable<String, PKCS10Attribute> map =
	new Hashtable<String, PKCS10Attribute>(3);

	/**
	* Default constructor for the PKCS10 attribute.
	*/
	public PKCS10Attributes() { }

	/**
	* Create the object from the array of PKCS10Attribute objects.
	*
	* @param attrs the array of PKCS10Attribute objects.
	*/
	public PKCS10Attributes(PKCS10Attribute[] attrs) {
	for (int i = 0; i < attrs.length; i++) {
	map.put(attrs[i].getAttributeId().toString(), attrs[i]);
	}
	}

	/**
	* Create the object, decoding the values from the passed DER stream.
	* The DER stream contains the SET OF Attribute.
	*
	* @param in the DerInputStream to read the attributes from.
	* @exception IOException on decoding errors.
	*/
	public PKCS10Attributes(DerInputStream in) throws IOException {
	DerValue[] attrs = in.getSet(3, true);

	if (attrs == null)
	throw new IOException("Illegal encoding of attributes");
	for (int i = 0; i < attrs.length; i++) {
	PKCS10Attribute attr = new PKCS10Attribute(attrs[i]);
	map.put(attr.getAttributeId().toString(), attr);
	}
	}

	/**
	* Encode the attributes in DER form to the stream.
	*
	* @param out the OutputStream to marshal the contents to.
	* @exception IOException on encoding errors.
	*/
	public void encode(OutputStream out) throws IOException {
	derEncode(out);
	}

	/**
	* Encode the attributes in DER form to the stream.
	* Implements the {@code DerEncoder} interface.
	*
	* @param out the OutputStream to marshal the contents to.
	* @exception IOException on encoding errors.
	*/
	public void derEncode(OutputStream out) throws IOException {
	// first copy the elements into an array
	Collection<PKCS10Attribute> allAttrs = map.values();
	PKCS10Attribute[] attribs =
	allAttrs.toArray(new PKCS10Attribute[map.size()]);

	DerOutputStream attrOut = new DerOutputStream();
	attrOut.putOrderedSetOf(DerValue.createTag(DerValue.TAG_CONTEXT,
	true, (byte)0),
	attribs);
	out.write(attrOut.toByteArray());
	}

	/**
	* Set the attribute value.
	*/
	public void setAttribute(String name, Object obj) {
	if (obj instanceof PKCS10Attribute) {
	map.put(name, (PKCS10Attribute)obj);
	}
	}

	/**
	* Get the attribute value.
	*/
	public Object getAttribute(String name) {
	return map.get(name);
	}

	/**
	* Delete the attribute value.
	*/
	public void deleteAttribute(String name) {
	map.remove(name);
	}

	/**
	* Return an enumeration of names of attributes existing within this
	* attribute.
	*/
	public Enumeration<PKCS10Attribute> getElements() {
	return (map.elements());
	}

	/**
	* Return a Collection of attributes existing within this
	* PKCS10Attributes object.
	*/
	public Collection<PKCS10Attribute> getAttributes() {
	return (Collections.unmodifiableCollection(map.values()));
	}

	/**
	* Compares this PKCS10Attributes for equality with the specified
	* object. If the {@code other} object is an
	* {@code instanceof} {@code PKCS10Attributes}, then
	* all the entries are compared with the entries from this.
	*
	* @param other the object to test for equality with this PKCS10Attributes.
	* @return true if all the entries match that of the Other,
	* false otherwise.
	*/
	public boolean equals(Object other) {
	if (this == other)
	return true;
	if (!(other instanceof PKCS10Attributes))
	return false;

	Collection<PKCS10Attribute> othersAttribs =
	((PKCS10Attributes)other).getAttributes();
	PKCS10Attribute[] attrs =
	othersAttribs.toArray(new PKCS10Attribute[othersAttribs.size()]);
	int len = attrs.length;
	if (len != map.size())
	return false;
	PKCS10Attribute thisAttr, otherAttr;
	String key = null;
	for (int i=0; i < len; i++) {
	otherAttr = attrs[i];
	key = otherAttr.getAttributeId().toString();

	if (key == null)
	return false;
	thisAttr = map.get(key);
	if (thisAttr == null)
	return false;
	if (! thisAttr.equals(otherAttr))
	return false;
	}
	return true;
	}

	/**
	* Returns a hashcode value for this PKCS10Attributes.
	*
	* @return the hashcode value.
	*/
	public int hashCode() {
	return map.hashCode();
	}

	/**
	* Returns a string representation of this {@code PKCS10Attributes} object
	* in the form of a set of entries, enclosed in braces and separated
	* by the ASCII characters "{@code , }" (comma and space).
	* <p>Overrides the {@code toString} method of {@code Object}.
	*
	* @return a string representation of this PKCS10Attributes.
	*/
	public String toString() {
	String s = map.size() + "\n" + map.toString();
	return s;
	}
	}

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