/*

  * Copyright 2011 The Kuali Foundation

  *

  * Licensed under the Educational Community License, Version 1.0 (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.opensource.org/licenses/ecl1.php

  *

  * 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.

  */

 package org.kuali.rice.krms.framework.engine.expression;

 import java.util.ArrayList;

 import java.util.List;

 import org.kuali.rice.krms.api.engine.ExecutionEnvironment;

 import org.kuali.rice.krms.framework.engine.Function;

 /**

  * TODO...

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  * 

  */

 public final class FunctionExpression implements Expression<Object> {

         private final Function function;

         private final List<Expression<? extends Object>> arguments;

         public FunctionExpression(Function function,

                         List<Expression<? extends Object>> arguments) {

                 this.function = function;

                 this.arguments = arguments;

         }

         @Override

         public Object invoke(ExecutionEnvironment environment) {

                 List<Object> argumentValues = new ArrayList<Object>(arguments.size());

                 for (Expression<? extends Object> argument : arguments) {

                         argumentValues.add(argument.invoke(environment));

                 }

                 return function.invoke(argumentValues);

         }

 }