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	/*
	* 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;

	import java.security.KeyStore;
	import java.security.cert.Certificate;
	import java.security.cert.X509Certificate;
	import java.util.ArrayList;
	import java.util.Iterator;
	import java.util.List;
	import java.util.NoSuchElementException;

	import com.sun.org.apache.xml.internal.security.keys.storage.implementations.KeyStoreResolver;
	import com.sun.org.apache.xml.internal.security.keys.storage.implementations.SingleCertificateResolver;

	/**
	* This class collects customized resolvers for Certificates.
	*/
	public class StorageResolver {

	private static final com.sun.org.slf4j.internal.Logger LOG =
	com.sun.org.slf4j.internal.LoggerFactory.getLogger(StorageResolver.class);

	/** Field storageResolvers */
	private List<StorageResolverSpi> storageResolvers;

	/**
	* Constructor StorageResolver
	*
	*/
	public StorageResolver() {}

	/**
	* Constructor StorageResolver
	*
	* @param resolver
	*/
	public StorageResolver(StorageResolverSpi resolver) {
	this.add(resolver);
	}

	/**
	* Method addResolver
	*
	* @param resolver
	*/
	public void add(StorageResolverSpi resolver) {
	if (storageResolvers == null) {
	storageResolvers = new ArrayList<>();
	}
	this.storageResolvers.add(resolver);
	}

	/**
	* Constructor StorageResolver
	*
	* @param keyStore
	*/
	public StorageResolver(KeyStore keyStore) {
	this.add(keyStore);
	}

	/**
	* Method addKeyStore
	*
	* @param keyStore
	*/
	public void add(KeyStore keyStore) {
	try {
	this.add(new KeyStoreResolver(keyStore));
	} catch (StorageResolverException ex) {
	LOG.error("Could not add KeyStore because of: ", ex);
	}
	}

	/**
	* Constructor StorageResolver
	*
	* @param x509certificate
	*/
	public StorageResolver(X509Certificate x509certificate) {
	this.add(x509certificate);
	}

	/**
	* Method addCertificate
	*
	* @param x509certificate
	*/
	public void add(X509Certificate x509certificate) {
	this.add(new SingleCertificateResolver(x509certificate));
	}

	/**
	* Method getIterator
	* @return the iterator for the resolvers.
	*/
	public Iterator<Certificate> getIterator() {
	return new StorageResolverIterator(this.storageResolvers.iterator());
	}

	/**
	* Class StorageResolverIterator
	* This iterates over all the Certificates found in all the resolvers.
	*/
	static class StorageResolverIterator implements Iterator<Certificate> {

	/** Field resolvers */
	Iterator<StorageResolverSpi> resolvers = null;

	/** Field currentResolver */
	Iterator<Certificate> currentResolver = null;

	/**
	* Constructor StorageResolverIterator
	*
	* @param resolvers
	*/
	public StorageResolverIterator(Iterator<StorageResolverSpi> resolvers) {
	this.resolvers = resolvers;
	currentResolver = findNextResolver();
	}

	/** {@inheritDoc} */
	public boolean hasNext() {
	if (currentResolver == null) {
	return false;
	}

	if (currentResolver.hasNext()) {
	return true;
	}

	currentResolver = findNextResolver();
	return currentResolver != null;
	}

	/** {@inheritDoc} */
	public Certificate next() {
	if (hasNext()) {
	return currentResolver.next();
	}

	throw new NoSuchElementException();
	}

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

	// Find the next storage with at least one element and return its Iterator
	private Iterator<Certificate> findNextResolver() {
	while (resolvers.hasNext()) {
	StorageResolverSpi resolverSpi = resolvers.next();
	Iterator<Certificate> iter = resolverSpi.getIterator();
	if (iter.hasNext()) {
	return iter;
	}
	}

	return null;
	}
	}
	}

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