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Java implementation of the Simple Certificate Enrollment Protocol

There is a newer version: 2.5.6

package org.jscep.client.verification;

import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.util.HashMap;
import java.util.Map;

/**
 * This CertificateVerifier delegates verification to the provided
 * CertificateVerifier and caches the answer.
 */
public final class CachingCertificateVerifier implements CertificateVerifier {
    /**
     * Previously received verification answers.
     */
    private final Map verificationAnswers;
    /**
     * The verifier to delegate to.
     */
    private final CertificateVerifier delegate;

    /**
     * Constructs a CachingCertificateVerifier which delegates to the
     * specified CertificateVerifier.
     * 
     * @param delegate
     *            the CertificateVerifier to delegate to.
     */
    public CachingCertificateVerifier(final CertificateVerifier delegate) {
        this.delegate = delegate;
        this.verificationAnswers = new HashMap();
    }

    /**
     * This implementation will forward the given certificate to the delegate
     * provided in the constructor, and cache the delegate's response.
     * 
     * On every subsequent invocation with the same certificate, the initial
     * response from the delegate will be returned.
     * 
     * @param cert
     *            the certificate to verify.
     * @return the result of calling verify on the delegate
     *         CertificateVerifier.
     */
    @Override
    public synchronized boolean verify(final X509Certificate cert) {
        if (verificationAnswers.containsKey(cert)) {
            return verificationAnswers.get(cert);
        } else {
            boolean answer = delegate.verify(cert);
            verificationAnswers.put(cert, answer);

            return answer;
        }
    }

}