/**
    * Copyright 2005-2011 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.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.Collections;
  import java.util.List;
  
  import org.kuali.rice.krms.api.engine.ExecutionEnvironment;
  import org.kuali.rice.krms.framework.engine.Proposition;
  import org.kuali.rice.krms.framework.engine.PropositionResult;
  
  /**
   * TODO... 
   * 
   * @author Kuali Rice Team (rice.collab@kuali.org)
   *
   */
  public class ExpressionBasedProposition implements Proposition {
  
  	private final Expression<Boolean> expression;
  	
  	public ExpressionBasedProposition(Expression<Boolean> expression) {
  		this.expression = expression;
  	}
  	
  	@Override
  	public PropositionResult evaluate(ExecutionEnvironment environment) {
  		return new PropositionResult(expression.invoke(environment).booleanValue());
  	}
  
  
      @Override
      public List<Proposition> getChildren() {
          return Collections.emptyList();
      }
      
      @Override
      public boolean isCompound() {
          return false;
      }
  }