/**
 * <copyright> Copyright 2006 by Know-Center, Graz, Austria </copyright>
 * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
 * joint initiative of the Federal Chancellery Austria and Graz University of
 * Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 */
package at.knowcenter.wag.egov.egiz.ldap.client;

import iaik.asn1.structures.Name;

import java.util.Hashtable;
import java.util.List;

import org.apache.log4j.Logger;


/**
 * @author <a href="mailto:thomas.knall@iaik.tugraz.at">Thomas Knall</a>
 */
public abstract class LDAPClientFactory {
	
	private final Logger log = Logger.getLogger(getClass());
	
	protected static final String DEFAULT_IDENTIFIER = "default LDAPClientFactory";

	/**
	 * Mapping of category/identifier to LDAPClientFactory.
	 * Allows the usage of multiple independently configured LDAPClientFactoryImpls. 
	 */
//	private static Hashtable<String, LDAPClientFactory> ldapClientFactoryInstances = new Hashtable<String, LDAPClientFactory>();
	private static Hashtable ldapClientFactoryInstances = new Hashtable();

	private LDAPMappingStore ldapMappingStore;
	
	protected LDAPClientFactory() {
		this.ldapMappingStore = new LDAPMappingStore();
	}
	
	public List getMappings(String issuerName) throws LDAPException {
		return this.ldapMappingStore.getMappings(issuerName);
	}
	
	public List getMapping(Name name) {
		return this.ldapMappingStore.getMappings(name);
	}

	public void resetMappings() {
		this.ldapMappingStore.clearStore();
	}
	
	public boolean hasBeenConfigured() {
		return !this.ldapMappingStore.isEmpty();
	}
	
	public synchronized void registerMapping(LDAPMapping ldapMapping) {
		this.ldapMappingStore.addMapping(ldapMapping);
	}
	
	public void setLDAPIssuerNameFilter(LDAPIssuerNameFilter filter) throws LDAPException {
		if (this.hasBeenConfigured()) {
			throw new LDAPException("Not allowed to set filter after registration of mappings.");
		}
		this.ldapMappingStore = new LDAPMappingStore(filter);
	}
	
	public boolean isLDAPIssuerNameFilter() {
		return this.ldapMappingStore.isLDAPIssuerNameFilter();
	}
	
	public static synchronized LDAPClientFactory getInstance(String identifier) {
		LDAPClientFactory ldapClientFactoryInstance = (LDAPClientFactory) ldapClientFactoryInstances.get(identifier);
		if (ldapClientFactoryInstance == null) {
			ldapClientFactoryInstance = new LDAPClientFactoryImpl();
			ldapClientFactoryInstances.put(identifier, ldapClientFactoryInstance);
		}
		return ldapClientFactoryInstance;
	}
	
	public static synchronized LDAPClientFactory getInstance() {
		return getInstance(DEFAULT_IDENTIFIER);
	}
	
	public abstract List createClients(String issuerName) throws LDAPException;
	
}