1 files changed, 62 insertions, 0 deletions
diff --git a/src/main/java/at/knowcenter/wag/egov/egiz/ldap/api/LDAPAPIFactoryImpl.java b/src/main/java/at/knowcenter/wag/egov/egiz/ldap/api/LDAPAPIFactoryImpl.java
new file mode 100644
index 0000000..340b54a
--- /dev/null
+++ b/src/main/java/at/knowcenter/wag/egov/egiz/ldap/api/LDAPAPIFactoryImpl.java
@@ -0,0 +1,62 @@
+package at.knowcenter.wag.egov.egiz.ldap.api;
+
+import java.util.Hashtable;
+
+import org.apache.log4j.Logger;
+
+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);
+
+	private Hashtable<String, LDAPAPI> ldapImpls;
+	
+	protected LDAPAPIFactoryImpl() {
+		ldapImpls = new Hashtable<String, LDAPAPI>();
+	}
+
+	private static 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.");
+		} 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 = ldapImpls.get(implClassURI);
+		if (impl == null) {
+			impl = instantiatelAPIImpl(implClassURI);
+			ldapImpls.put(implClassURI, impl);
+		}
+		return impl;
+	}
+
+}