org.apache.xml.security.keys.storage.implementations.SingleCertificateResolver Maven / Gradle / Ivy

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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.xml.security.keys.storage.implementations;

import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.util.Iterator;
import java.util.NoSuchElementException;

import org.apache.xml.security.keys.storage.StorageResolverSpi;

/**
 * This {@link StorageResolverSpi} makes a single {@link X509Certificate}
 * available to the {@link org.apache.xml.security.keys.storage.StorageResolver}.
 */
public class SingleCertificateResolver extends StorageResolverSpi {

    /** Field certificate */
    private X509Certificate certificate = null;

    /**
     * @param x509cert the single {@link X509Certificate}
     */
    public SingleCertificateResolver(X509Certificate x509cert) {
        this.certificate = x509cert;
    }

    /** @inheritDoc */
    public Iterator getIterator() {
        return new InternalIterator(this.certificate);
    }

    /**
     * Class InternalIterator
     */
    static class InternalIterator implements Iterator {

        /** Field alreadyReturned */
        boolean alreadyReturned = false;

        /** Field certificate */
        X509Certificate certificate = null;

        /**
         * Constructor InternalIterator
         *
         * @param x509cert
         */
        public InternalIterator(X509Certificate x509cert) {
            this.certificate = x509cert;
        }

        /** @inheritDoc */
        public boolean hasNext() {
            return !this.alreadyReturned;
        }

        /** @inheritDoc */
        public Certificate next() {
            if (this.alreadyReturned) {
                throw new NoSuchElementException();
            }
            this.alreadyReturned = true;
            return this.certificate;
        }

        /**
         * Method remove
         */
        public void remove() {
            throw new UnsupportedOperationException("Can't remove keys from KeyStore");
        }
    }
}