/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

/**

 * 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 com.sun.org.apache.xml.internal.security.keys.storage.implementations;

import java.security.cert.Certificate;

import java.security.cert.X509Certificate;

import java.util.Iterator;

import java.util.NoSuchElementException;

import com.sun.org.apache.xml.internal.security.keys.storage.StorageResolverSpi;

/**

 * This {@link StorageResolverSpi} makes a single {@link X509Certificate}

 * available to the {@link com.sun.org.apache.xml.internal.security.keys.storage.StorageResolver}.

 */

public class SingleCertificateResolver extends StorageResolverSpi {

    /** Field certificate */

    private X509Certificate certificate;

    /**

     * @param x509cert the single {@link X509Certificate}

     */

    public SingleCertificateResolver(X509Certificate x509cert) {

        this.certificate = x509cert;

    }

    /** {@inheritDoc} */

    public Iterator<Certificate> getIterator() {

        return new InternalIterator(this.certificate);

    }

    /**

     * Class InternalIterator

     */

    static class InternalIterator implements Iterator<Certificate> {

        /** 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");

        }

    }

}