package at.knowcenter.wag.egov.egiz.ldap.api;
import java.util.Hashtable;
import org.apache.log4j.Logger;
import at.knowcenter.wag.egov.egiz.ldap.client.LDAPIssuerNameFilter;
import at.knowcenter.wag.egov.egiz.sig.LDAPAPI;
/**
* @author Thomas Knall
*/
public class LDAPAPIFactoryImpl extends LDAPAPIFactory {
private static final Logger log = Logger.getLogger(LDAPAPIFactoryImpl.class);
// mapping
private Hashtable ldapImpls;
private LDAPIssuerNameFilter ldapIssuerNameFilter;
protected LDAPAPIFactoryImpl(LDAPIssuerNameFilter ldapIssuerNameFilter) {
this.ldapImpls = new Hashtable();
this.ldapIssuerNameFilter = ldapIssuerNameFilter;
}
private LDAPAPI instantiatelAPIImpl(String implClassURI) throws LDAPAPIException {
if (implClassURI == null) {
throw new NullPointerException("URI of implementing class must not be null.");
}
if (implClassURI.length() == 0) {
throw new IllegalArgumentException("URI of implementing class must not be empty.");
}
log.info("Trying to instantiate \"" + LDAPAPI.class.getName() + "\" implementation \"" + implClassURI + "\"...");
LDAPAPI ldapAPIImpl = null;
try {
Class clazz = Class.forName(implClassURI);
Object ldapAPIImplObj = clazz.newInstance();
if (!(ldapAPIImplObj instanceof LDAPAPI)) {
throw new LDAPAPIException("Declared class does not implement \"" + LDAPAPI.class.getName() + "\".");
}
ldapAPIImpl = (LDAPAPI) ldapAPIImplObj;
log.info("LDAPAPI implementation successfully instantiated.");
ldapAPIImpl.setIssuerNameFilter(this.ldapIssuerNameFilter);
} catch (InstantiationException e) {
throw new LDAPAPIException("Declared implementation of \"" + LDAPAPI.class.getName() + "\" cannot be instantiated.");
} catch (IllegalAccessException e) {
throw new LDAPAPIException("Declared implementation of \"" + LDAPAPI.class.getName() + "\" cannot be instantiated (illegal access).");
} catch (ClassNotFoundException e) {
throw new LDAPAPIException("Unable to find class \"" + implClassURI + "\" as implementation of \"" + LDAPAPI.class.getName() + "\".");
}
return ldapAPIImpl;
}
@Override
public synchronized LDAPAPI createLDAPAPI(String implClassURI) throws LDAPAPIException {
if (implClassURI == null || implClassURI.length() == 0) {
// use internal implementation
implClassURI = LDAPAPIImpl.class.getName();
}
LDAPAPI impl = this.ldapImpls.get(implClassURI);
if (impl == null) {
impl = this.instantiatelAPIImpl(implClassURI);
this.ldapImpls.put(implClassURI, impl);
}
return impl;
}
}