/*
    * Copyright 2004-2006 the Seasar Foundation and the Others.
    *
    * 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.
   */
  package org.seasar.tuigwaa.database.function.criteria;
  
  import java.lang.reflect.InvocationTargetException;
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  import org.apache.commons.beanutils.PropertyUtils;
  
  public class CriteriaListFunction implements CriteriaFunction {
  
  	private boolean isDisjunction_;
  
  	private List functionList_ = new ArrayList();
  
  	private String name;
  
  	public CriteriaListFunction() {
  	}
  
  	public static CriteriaListFunction create(int firstResult, int maxResult) {
  		CriteriaListFunction func = new CriteriaListFunction();
  		if (firstResult > 0) {
  			func.addFunction(new FirstResultCriteriaFunction(firstResult));
  		}
  		if (maxResult > 0) {
  			func.addFunction(new MaxResultCriteriaFunction(maxResult));
  		}
  		return func;
  	}
  	
  	public static CriteriaFunction addCriteria(CriteriaFunction origCriteria, CriteriaFunction addCriteria){
  		if(origCriteria == null){
  			return addCriteria;
  		}else if(origCriteria instanceof CriteriaListFunction){
  			((CriteriaListFunction)origCriteria).addFunction(addCriteria);
  			return origCriteria;
  		}else{
  			return new CriteriaListFunction(origCriteria, addCriteria);
  		}
  	}
  	
  	public CriteriaListFunction(CriteriaFunction obj) {
  		functionList_.add(obj);
  	}
  
  	public CriteriaListFunction(CriteriaFunction left, CriteriaFunction right) {
  		functionList_.add(left);
  		functionList_.add(right);
  	}
  
  	public void setName(String name) {
  		this.name = name;
  	}
  
  	public String getName() {
  		return name;
  	}
  
  	public boolean isDisjunction() {
  		return isDisjunction_;
  	}
  
  	public void setDisjunction(boolean disjunction) {
  		this.isDisjunction_ = disjunction;
  	}
  
  	public List getFunctionList() {
  		return functionList_;
  	}
  
  	public CriteriaListFunction replace(String name, CriteriaFunction newFunc) {
  		CriteriaListFunction list = new CriteriaListFunction();
  		for (Iterator i = functionList_.iterator(); i.hasNext();) {
  			CriteriaFunction func = (CriteriaFunction) i.next();
  			String aName = func.getName();
  			if (name.equals(aName)) {
  				list.addFunction(newFunc);
  			} else {
  				list.addFunction(func);
  			}
  		}
  		return list;
  	}
 
 	public void injectCriteriaListFunction(CriteriaFunction func) {
 		if (func instanceof CriteriaListFunction) {
 			CriteriaListFunction listFunction = (CriteriaListFunction) func;
 			Iterator itr = listFunction.getFunctionList().iterator();
 			while (itr.hasNext()) {
 				CriteriaFunction criteriaFunction = (CriteriaFunction) itr
 						.next();
 				addFunction(criteriaFunction);
 			}
 		} else {
 			addFunction(func);
 		}
 	}
 
 	public void addFunction(CriteriaFunction function) {
 		if (function != null) {
 			functionList_.add(function);
 		}
 	}
 
 	public Object evaluate(Object obj) {
 		return evaluate((ICriteria) obj);
 	}
 
 	public Object evaluate(ICriteria criteria) {
 		Iterator itr = functionList_.iterator();
 
 		ICriteria listCriteria = disjunctionCheck(criteria);
 
 		while (itr.hasNext()) {
 			UnaryCriteriaFunction function = (UnaryCriteriaFunction) itr.next();
 			function.evaluate(listCriteria);
 		}
 		return criteria;
 	}
 
 	public Object evaluate(Object left, Object right) {
 		return evaluate((ICriteria) left, right);
 	}
 
 	public Object evaluate(ICriteria criteria, Object dto) {
 		Iterator itr = functionList_.iterator();
 
 		ICriteria listCriteria = disjunctionCheck(criteria);
 
 		while (itr.hasNext()) {
 			BinaryCriteriaFunction function = (BinaryCriteriaFunction) itr
 					.next();
 			String name = function.getName();
 
 			try {
 				Object value = PropertyUtils.getProperty(dto, name);
 				function.evaluate(listCriteria, value);
 			} catch (IllegalAccessException e) {
 				// do nothing
 			} catch (InvocationTargetException e) {
 				// do nothing
 			} catch (NoSuchMethodException e) {
 				// do nothing
 			}
 		}
 		return criteria;
 	}
 
 	private ICriteria disjunctionCheck(ICriteria criteria) {
 		if (isDisjunction_) {
 			return criteria.disjunction();
 		} else {
 			return criteria;
 		}
 	}
 
 	public void setValue(Object value) {
 		// do nothing
 	}
 
 	public void setField(String field) {
 		// do nothing
 	}
 
 	public String getField() {
 		return null;
 	}
 
 	public void setOption(String option) {
 		// do nothing
 	}
 
 	public String getOption() {
 		return null;
 	}
 
 	public Object getValue() {
 		return null;
 	}
 }