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diff --git a/pdf-as-lib/src/main/java/at/knowcenter/wag/egov/egiz/ldap/api/LDAPAPIFactoryImpl.java b/pdf-as-lib/src/main/java/at/knowcenter/wag/egov/egiz/ldap/api/LDAPAPIFactoryImpl.java
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+++ b/pdf-as-lib/src/main/java/at/knowcenter/wag/egov/egiz/ldap/api/LDAPAPIFactoryImpl.java
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+/**
+ * <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.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 <a href="mailto:thomas.knall@iaik.tugraz.at">Thomas Knall</a>
+ */
+public class LDAPAPIFactoryImpl extends LDAPAPIFactory {
+
+	private static final Logger log = Logger.getLogger(LDAPAPIFactoryImpl.class);
+
+	// mapping <full qualified class name, LDAPAPI implementation>
+//	private Hashtable<String, LDAPAPI> ldapImpls;
+	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;
+	}
+	
+	public synchronized LDAPAPI createLDAPAPI(String implClassURI) throws LDAPAPIException {
+		if (implClassURI == null || implClassURI.length() == 0) {
+			// use internal implementation
+			implClassURI = LDAPAPIImpl.class.getName();
+		}
+		LDAPAPI impl = (LDAPAPI) this.ldapImpls.get(implClassURI);
+		if (impl == null) {
+			impl = this.instantiatelAPIImpl(implClassURI);
+			this.ldapImpls.put(implClassURI, impl);
+		}
+		return impl;
+	}
+
+}