/*
 * 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.
/**
 * 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.KeyStore;
import java.security.KeyStoreException;
import java.security.cert.Certificate;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.NoSuchElementException;

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

Makes the Certificates from a JAVA KeyStore object available to the StorageResolver. /**
 * Makes the Certificates from a JAVA {@link KeyStore} object available to the
 * {@link com.sun.org.apache.xml.internal.security.keys.storage.StorageResolver}.
 */
public class KeyStoreResolver extends StorageResolverSpi {

    
Field keyStore /** Field keyStore */
    private KeyStore keyStore;

    
Constructor KeyStoreResolver
Params:
keyStore – is the keystore which contains the Certificates
Throws:
StorageResolverException – /**
     * Constructor KeyStoreResolver
     *
     * @param keyStore is the keystore which contains the Certificates
     * @throws StorageResolverException
     */
    public KeyStoreResolver(KeyStore keyStore) throws StorageResolverException {
        this.keyStore = keyStore;
        // Do a quick check on the keystore
        try {
            keyStore.aliases();
        } catch (KeyStoreException ex) {
            throw new StorageResolverException(ex);
        }
    }

    
{@inheritDoc} /** {@inheritDoc} */
    public Iterator<Certificate> getIterator() {
        return new KeyStoreIterator(this.keyStore);
    }

    
Class KeyStoreIterator
/**
     * Class KeyStoreIterator
     */
    static class KeyStoreIterator implements Iterator<Certificate> {

        
Field keyStore /** Field keyStore */
        KeyStore keyStore = null;

        
Field aliases /** Field aliases */
        Enumeration<String> aliases = null;

        
Field nextCert /** Field nextCert */
        Certificate nextCert = null;

        
Constructor KeyStoreIterator
Params:
keyStore – /**
         * Constructor KeyStoreIterator
         *
         * @param keyStore
         */
        public KeyStoreIterator(KeyStore keyStore) {
            try {
                this.keyStore = keyStore;
                this.aliases = this.keyStore.aliases();
            } catch (KeyStoreException ex) {
                // empty Enumeration
                this.aliases = new Enumeration<String>() {
                    public boolean hasMoreElements() {
                        return false;
                    }
                    public String nextElement() {
                        return null;
                    }
                };
            }
        }

        
{@inheritDoc} /** {@inheritDoc} */
        public boolean hasNext() {
            if (nextCert == null) {
                nextCert = findNextCert();
            }

            return nextCert != null;
        }

        
{@inheritDoc} /** {@inheritDoc} */
        public Certificate next() {
            if (nextCert == null) {
                // maybe caller did not call hasNext()
                nextCert = findNextCert();

                if (nextCert == null) {
                    throw new NoSuchElementException();
                }
            }

            Certificate ret = nextCert;
            nextCert = null;
            return ret;
        }

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

        // Find the next entry that contains a certificate and return it.
        // In particular, this skips over entries containing symmetric keys.
        private Certificate findNextCert() {
            while (this.aliases.hasMoreElements()) {
                String alias = this.aliases.nextElement();
                try {
                    Certificate cert = this.keyStore.getCertificate(alias);
                    if (cert != null) {
                        return cert;
                    }
                } catch (KeyStoreException ex) {
                    return null;
                }
            }

            return null;
        }

    }

}