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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.x509;

import org.bouncycastle.util.Selector;

/**
 * This class is an Selector like implementation to select
 * certificates pairs, which are e.g. used for cross certificates. The set of
 * criteria is given from two
 * {@link org.bouncycastle.x509.X509CertStoreSelector}s which must be both
 * matched.
 * 
 * @see org.bouncycastle.x509.X509AttributeCertificate
 * @see org.bouncycastle.x509.X509Store
 */
public class X509CertPairStoreSelector implements Selector
{

    private X509CertStoreSelector forwardSelector;

    private X509CertStoreSelector reverseSelector;

    private X509CertificatePair certPair;

    public X509CertPairStoreSelector()
    {
    }

    /**
     * Returns the certificate pair which is used for testing on equality.
     * 
     * @return Returns the certificate pair which is checked.
     */
    public X509CertificatePair getCertPair()
    {
        return certPair;
    }

    /**
     * Set the certificate pair which is used for testing on equality.
     * 
     * @param certPair The certPairChecking to set.
     */
    public void setCertPair(X509CertificatePair certPair)
    {
        this.certPair = certPair;
    }

    /**
     * @param forwardSelector The certificate selector for the forward part in
     *            the pair.
     */
    public void setForwardSelector(X509CertStoreSelector forwardSelector)
    {
        this.forwardSelector = forwardSelector;
    }

    /**
     * @param reverseSelector The certificate selector for the reverse part in
     *            the pair.
     */
    public void setReverseSelector(X509CertStoreSelector reverseSelector)
    {
        this.reverseSelector = reverseSelector;
    }

    /**
     * Returns a clone of this selector.
     * 
     * @return A clone of this selector.
     * @see java.lang.Object#clone()
     */
    public Object clone()
    {
        X509CertPairStoreSelector cln = new X509CertPairStoreSelector();

        cln.certPair = certPair;
        
        if (forwardSelector != null)
        {
            cln.setForwardSelector((X509CertStoreSelector) forwardSelector
                    .clone());
        }

        if (reverseSelector != null)
        {
            cln.setReverseSelector((X509CertStoreSelector) reverseSelector
                    .clone());
        }

        return cln;
    }

    /**
     * Decides if the given certificate pair should be selected. If
     * obj is not a {@link X509CertificatePair} this method
     * returns false.
     * 
     * @param obj The {@link X509CertificatePair} which should be tested.
     * @return true if the object matches this selector.
     */
    public boolean match(Object obj)
    {
        try
        {
            if (!(obj instanceof X509CertificatePair))
            {
                return false;
            }
            X509CertificatePair pair = (X509CertificatePair)obj;

            if (forwardSelector != null
                    && !forwardSelector.match((Object)pair.getForward()))
            {
                return false;
            }

            if (reverseSelector != null
                    && !reverseSelector.match((Object)pair.getReverse()))
            {
                return false;
            }

            if (certPair != null)
            {
                return certPair.equals(obj);
            }

            return true;
        }
        catch (Exception e)
        {
            return false;
        }
    }

    /**
     * Returns the certicate selector for the forward part.
     * 
     * @return Returns the certicate selector for the forward part.
     */
    public X509CertStoreSelector getForwardSelector()
    {
        return forwardSelector;
    }

    /**
     * Returns the certicate selector for the reverse part.
     * 
     * @return Returns the reverse selector for teh reverse part.
     */
    public X509CertStoreSelector getReverseSelector()
    {
        return reverseSelector;
    }
}