package at.knowcenter.wag.egov.egiz.ldap.client;

import iaik.asn1.structures.Name;

import java.util.Hashtable;

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 LDAPMapping getMapping(String issuerName) throws LDAPException {
		return this.ldapMappingStore.getMapping(issuerName);
	}
	
	public LDAPMapping getMapping(Name name) {
		return this.ldapMappingStore.getMapping(name);
	}

	public void resetMappings() {
		this.ldapMappingStore.clearStore();
	}
	
	public boolean hasBeenConfigured() {
		return !this.ldapMappingStore.isEmpty();
	}
	
//	public synchronized void registerMappings(Iterable<LDAPMapping> iterable) {
//	public synchronized void registerMappings(Iterable iterable) {
//		if (!iterable.iterator().hasNext()) {
//			log.warn("There were no ldap mappings provided.");
//		}
//		this.ldapMappingStore.storeMappings(iterable);
//	}
	
	public synchronized void registerMapping(LDAPMapping ldapMapping) {
		this.ldapMappingStore.storeMapping(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 idenfifier) {
		LDAPClientFactory ldapClientFactoryInstance = (LDAPClientFactory) ldapClientFactoryInstances.get(idenfifier);
		if (ldapClientFactoryInstance == null) {
			ldapClientFactoryInstance = new LDAPClientFactoryImpl();
			ldapClientFactoryInstances.put(idenfifier, ldapClientFactoryInstance);
		}
		return ldapClientFactoryInstance;
	}
	
	public static synchronized LDAPClientFactory getInstance() {
		return getInstance(DEFAULT_IDENTIFIER);
	}
	
	public abstract LDAPClient createClient(String issuerName) throws LDAPException;
	
}