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/* LoadChildrenBindingImpl.java

	Purpose:
		
	Description:
		
	History:
		2012/1/2 Created by Dennis Chen

Copyright (C) 2011 Potix Corporation. All Rights Reserved.
*/

package org.zkoss.bind.impl;

import java.lang.reflect.Method;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.zkoss.bind.BindContext;
import org.zkoss.bind.Binder;
import org.zkoss.bind.Converter;
import org.zkoss.bind.sys.BindEvaluatorX;
import org.zkoss.bind.sys.BinderCtrl;
import org.zkoss.bind.sys.ConditionType;
import org.zkoss.bind.sys.LoadChildrenBinding;
import org.zkoss.bind.sys.debugger.BindingExecutionInfoCollector;
import org.zkoss.bind.sys.debugger.impl.info.LoadInfo;
import org.zkoss.bind.xel.zel.BindELContext;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.UiException;

/**
 * Implementation of {@link LoadChildrenBinding}.
 * @author dennis
 * @since 6.0.0
 */
public class LoadChildrenBindingImpl extends ChildrenBindingImpl implements
		LoadChildrenBinding {
	private static final long serialVersionUID = 1463169907348730644L;
	private final Set _doneDependsOn;
//	private final Set> _doneConverterDependsOn;
	
	public LoadChildrenBindingImpl(Binder binder, Component comp,
		String loadExpr, ConditionType conditionType,String command,  Map bindingArgs,
		String converterExpr,Map converterArgs) {
		super(binder, comp, loadExpr, conditionType, command, bindingArgs,converterExpr,converterArgs);
		_doneDependsOn = new HashSet(4);
//		_doneConverterDependsOn = new HashSet>(4);
	}
	
	@SuppressWarnings("unchecked")
	public void load(BindContext ctx) {
		final Component comp = getComponent();//ctx.getComponent();
		final BindEvaluatorX eval = getBinder().getEvaluatorX();
		final BindingExecutionInfoCollector collector = ((BinderCtrl)getBinder()).getBindingExecutionInfoCollector();
		//get data from property
		Object value = eval.getValue(ctx, comp, _accessInfo.getProperty());
		
		final boolean activating = ((BinderCtrl)getBinder()).isActivating();	
		
		//use _converter to convert type if any
		final Converter conv = getConverter();
		if (conv != null) {
//			//if a converter depends on some property, we should also add tracker
//			//TODO, Dennis, ISSUES, currently, a base path of a converter, is its binding path.
//			//ex @bind(vm.person.firstName) , it's base path is 'vm.person.firstName', not 'vm.person'
//			//this sepc is different with DependsOn of a property
//			addConverterDependsOnTrackings(conv, ctx);
			
			if(activating) return;//don't load to component if activating
			Object old;
			value = conv.coerceToUi(old = value, comp, ctx);
			if(value == Converter.IGNORED_VALUE) {
				if(collector!=null){
					collector.addInfo(new LoadInfo(LoadInfo.CHILDREN_LOAD,comp,getConditionString(ctx),
							getPropertyString(),null,old,getArgs(),"*Converter.IGNORED_VALUE"));
				}
				return;
			}
		}
		if(activating) return;//don't load to component if activating
		
		comp.getChildren().clear();
		BindELContext.removeModel(comp);
		if(value!=null){
			List