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/*
 *
 *          Copyright (c) 2013,2019  AT&T Knowledge Ventures
 *                     SPDX-License-Identifier: MIT
 */
package com.att.research.xacmlatt.pdp.std;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.Map;

import com.att.research.xacml.api.Identifier;
import com.att.research.xacmlatt.pdp.policy.FunctionDefinition;
import com.att.research.xacmlatt.pdp.policy.FunctionDefinitionFactory;

/**
 * StdFunctionDefinitionFactory is the default {@link com.att.research.xacmlatt.pdp.policy.FunctionDefinitionFactory} implementation
 * used if no other FunctionDefinitionFactory implementation is supplied.  It contains all of the standard XACML 3.0
 * functions.
 * 
 * @author car
 * @version $Revision: 1.2 $
 */
public class StdFunctionDefinitionFactory extends FunctionDefinitionFactory {
	private static Map 	mapFunctionDefinitions	= new HashMap<>();
	private static boolean								needMapInit				= true;
	
	private static void register(FunctionDefinition functionDefinition) {
		mapFunctionDefinitions.put(functionDefinition.getId(), functionDefinition);
	}
		
    private static void initMap() {
      if (!needMapInit) {
        return;
      }
      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) {

              }
            }
          }
        }
      }
    }
	
	public StdFunctionDefinitionFactory() {
		initMap();
	}

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