/*
 * @(#)X500PrivateCredential.java	1.8 03/12/19
 *
 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.security.auth.x500;

import java.security.PrivateKey;
import java.security.cert.X509Certificate;
import javax.security.auth.Destroyable;

/**
 * <p> This class represents an <code>X500PrivateCredential</code>.
 * It associates an X.509 certificate, corresponding private key and the
 * KeyStore alias used to reference that exact key pair in the KeyStore.
 * This enables looking up the private credentials for an X.500 principal
 * in a subject. 
 *
 * @version 1.8, 12/19/03
 */
public final class X500PrivateCredential implements Destroyable {
    private X509Certificate cert;
    private PrivateKey key;
    private String alias;

    /**
     * Creates an X500PrivateCredential that associates an X.509 certificate,
     * a private key and the KeyStore alias.
     * <p>
     * @param cert X509Certificate
     * @param key  PrivateKey for the certificate
     * @exception IllegalArgumentException if either <code>cert</code> or 
     * <code>key</code> is null
     *
     */
    
    public X500PrivateCredential(X509Certificate cert, PrivateKey key) {
	if (cert == null || key == null )
	    throw new IllegalArgumentException();
	this.cert = cert;
	this.key = key;
	this.alias=null;
    }

    /**
     * Creates an X500PrivateCredential that associates an X.509 certificate,
     * a private key and the KeyStore alias.
     * <p>
     * @param cert X509Certificate
     * @param key  PrivateKey for the certificate
     * @param alias KeyStore alias
     * @exception IllegalArgumentException if either <code>cert</code>, 
     * <code>key</code> or <code>alias</code> is null
     *
     */
    public X500PrivateCredential(X509Certificate cert, PrivateKey key,
				 String alias) {
	if (cert == null || key == null|| alias == null )
	    throw new IllegalArgumentException();
	this.cert = cert;
	this.key = key;
	this.alias=alias;
    }

    /**
     * Returns the X.509 certificate.
     * <p>
     * @return the X509Certificate
     */

    public X509Certificate getCertificate() {
	return cert;
    }

    /**
     * Returns the PrivateKey.
     * <p>
     * @return the PrivateKey
     */
    public PrivateKey getPrivateKey() {
	return key;
    }

    /**
     * Returns the KeyStore alias.
     * <p>
     * @return the KeyStore alias
     */

    public String getAlias() {
	return alias;
    }

    /**
     * Clears the references to the X.509 certificate, private key and the
     * KeyStore alias in this object.
     */

    public void destroy() {
	cert = null;
	key = null;
	alias =null;
    }

    /**
     * Determines if the references to the X.509 certificate and private key
     * in this object have been cleared.
     * <p>
     * @return true if X509Certificate and the PrivateKey are null

     */
    public boolean isDestroyed() {
	return cert == null && key == null && alias==null;
    }
}