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package javax.security.auth.x500;

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

 This class represents an X500PrivateCredential. 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. 
Since:
1.4/**
 * <p> This class represents an {@code X500PrivateCredential}.
 * 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.
 *
 * @since 1.4
 */
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.
Params:
cert – X509Certificate
key –  PrivateKey for the certificate
Throws:
IllegalArgumentException – if either cert or key is null/**
     * Creates an X500PrivateCredential that associates an X.509 certificate,
     * a private key and the KeyStore alias.
     *
     * @param cert X509Certificate
     * @param key  PrivateKey for the certificate
     * @exception IllegalArgumentException if either {@code cert} or
     * {@code key} 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.
Params:
cert – X509Certificate
key –  PrivateKey for the certificate
alias – KeyStore alias
Throws:
IllegalArgumentException – if either cert, key or alias is null/**
     * Creates an X500PrivateCredential that associates an X.509 certificate,
     * a private key and the KeyStore alias.
     *
     * @param cert X509Certificate
     * @param key  PrivateKey for the certificate
     * @param alias KeyStore alias
     * @exception IllegalArgumentException if either {@code cert},
     * {@code key} or {@code alias} 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.
Returns:
the X509Certificate/**
     * Returns the X.509 certificate.
     *
     * @return the X509Certificate
     */

    public X509Certificate getCertificate() {
        return cert;
    }

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

    
Returns the KeyStore alias.
Returns:
the KeyStore alias/**
     * Returns the KeyStore alias.
     *
     * @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.
/**
     * 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.
Returns:
true if X509Certificate and the PrivateKey are null/**
     * Determines if the references to the X.509 certificate and private key
     * in this object have been cleared.
     *
     * @return true if X509Certificate and the PrivateKey are null

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