[New] Added PolicyHandler.isPolicyDefAvailable()

li.strolch.agent/src/main/java/li/strolch/policy/DefaultPolicyHandler.java

@@ -81,6 +81,7 @@ public class DefaultPolicyHandler extends StrolchComponent implements PolicyHand
 
 	@Override
 	public <T extends StrolchPolicy> T getPolicy(PolicyDef policyDef, StrolchTransaction tx) {
+		DBC.PRE.assertNotNull("policyDef must not be null!", policyDef);
 		DBC.PRE.assertNotNull("tx must not be null!", tx);
 		try {
 
@@ -94,6 +95,19 @@ public class DefaultPolicyHandler extends StrolchComponent implements PolicyHand
 		}
 	}
 
+	@Override
+	public boolean isPolicyDefAvailable(PolicyDef policyDef) {
+		DBC.PRE.assertNotNull("policyDef must not be null!", policyDef);
+
+		if (policyDef instanceof KeyPolicyDef)
+			return this.classByTypeMap.containsElement(policyDef.getType(), policyDef.getValue());
+
+		if (policyDef instanceof JavaPolicyDef)
+			return true;
+
+		throw new IllegalArgumentException("Unhandled PolicyDev instance " + policyDef.getClass());
+	}
+
 	@Override
 	public <T> Class<T> visit(JavaPolicyDef policyDef) throws ClassNotFoundException {
 		String value = policyDef.getValue();

li.strolch.agent/src/main/java/li/strolch/policy/PolicyHandler.java

@@ -53,5 +53,15 @@ public interface PolicyHandler {
 	 *
 	 * @return the instantiated instance of the referenced policy
 	 */
-	public <T extends StrolchPolicy> T getPolicy(PolicyDef policyDef, StrolchTransaction tx);
+	<T extends StrolchPolicy> T getPolicy(PolicyDef policyDef, StrolchTransaction tx);
+
+	/**
+	 * Returns true, if the policy definition is known
+	 *
+	 * @param policyDef
+	 * 		the policy definition to check for
+	 *
+	 * @return true if the policy definition is known, false otherwise
+	 */
+	boolean isPolicyDefAvailable(PolicyDef policyDef);
 }