/*-
 * ============LICENSE_START=======================================================
 * ECOMP-TEST
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ============LICENSE_END=========================================================
 */

package org.openecomp.policy.pdp.test.custom;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.util.HashMap;
import java.util.Map;

import com.att.research.xacml.api.Identifier;
import com.att.research.xacml.std.IdentifierImpl;
import com.att.research.xacmlatt.pdp.policy.FunctionDefinition;
import com.att.research.xacmlatt.pdp.policy.FunctionDefinitionFactory;
import com.att.research.xacmlatt.pdp.std.StdFunctions;
import com.att.research.xacmlatt.pdp.std.functions.FunctionDefinitionBagOneAndOnly;

public class CustomFunctionDefinitionFactory extends FunctionDefinitionFactory {
	private static Map<Identifier,FunctionDefinition> 	mapFunctionDefinitions	= new HashMap<Identifier,FunctionDefinition>();
	private static boolean								needMapInit				= true;
	
	public static final Identifier ID_FUNCTION_PRIVATEKEY_ONE_AND_ONLY = new IdentifierImpl("urn:com:att:research:xacml:custom:function:3.0:rsa:privatekey-one-and-only");
	public static final Identifier ID_FUNCTION_PUBLICKEY_ONE_AND_ONLY = new IdentifierImpl("urn:com:att:research:xacml:custom:function:3.0:rsa:publickey-one-and-only");
	
	public static final FunctionDefinition	FD_PRIVATEKEY_ONE_AND_ONLY	= new FunctionDefinitionBagOneAndOnly<PrivateKey>(ID_FUNCTION_PRIVATEKEY_ONE_AND_ONLY, DataTypePrivateKey.newInstance());
	public static final FunctionDefinition	FD_PUBLICKEY_ONE_AND_ONLY	= new FunctionDefinitionBagOneAndOnly<PublicKey>(ID_FUNCTION_PUBLICKEY_ONE_AND_ONLY, DataTypePublicKey.newInstance());

	private static void register(FunctionDefinition functionDefinition) {
		mapFunctionDefinitions.put(functionDefinition.getId(), functionDefinition);
	}
		
	private static void initMap() {
		if (needMapInit) {
			synchronized(mapFunctionDefinitions) {
				if (needMapInit) {
					needMapInit	= false;
					Field[] declaredFields	= StdFunctions.class.getDeclaredFields();
					for (Field field : declaredFields) {
						if (Modifier.isStatic(field.getModifiers()) && 
							field.getName().startsWith(StdFunctions.FD_PREFIX) &&
							FunctionDefinition.class.isAssignableFrom(field.getType()) &&
							Modifier.isPublic(field.getModifiers())
						) {
							try {
								register((FunctionDefinition)(field.get(null)));
							} catch (IllegalAccessException ex) {
								
							}
						}
					}
					//
					// Our custom function
					//
					register(FunctionDefinitionDecrypt.newInstance());
					register(FD_PRIVATEKEY_ONE_AND_ONLY);
					register(FD_PUBLICKEY_ONE_AND_ONLY);
				}
			}
		}
	}
	
	public CustomFunctionDefinitionFactory() {
		initMap();
	}

	@Override
	public FunctionDefinition getFunctionDefinition(Identifier functionId) {
		return mapFunctionDefinitions.get(functionId);
	}

}