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/*
 * Copyright 2009-2014 PrimeTek.
 *
 * 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.primefaces.component.collector;

import java.io.IOException;

import javax.el.ELException;
import javax.el.ValueExpression;
import javax.faces.FacesException;
import javax.faces.component.ActionSource;
import javax.faces.component.UIComponent;
import javax.faces.view.facelets.ComponentHandler;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.FaceletException;
import javax.faces.view.facelets.TagAttribute;
import javax.faces.view.facelets.TagConfig;
import javax.faces.view.facelets.TagHandler;

public class CollectorTagHandler extends TagHandler {

	private final TagAttribute addTo;
	private final TagAttribute removeFrom;
	private final TagAttribute value;
    private final TagAttribute unique;

	public CollectorTagHandler(TagConfig tagConfig) {
		super(tagConfig);
		this.addTo = getAttribute("addTo");
		this.removeFrom = getAttribute("removeFrom");
		this.value = getRequiredAttribute("value");
        this.unique = getAttribute("unique");
	}

	public void apply(FaceletContext faceletContext, UIComponent parent) throws IOException, FacesException, FaceletException, ELException {
		if (ComponentHandler.isNew(parent)) {
			ValueExpression addToVE = null;
			ValueExpression removeFromVE = null;
            ValueExpression uniqueVE = null;
			
			if(addTo != null)
				addToVE = addTo.getValueExpression(faceletContext, Object.class);
			
			if(removeFrom != null)
				removeFromVE = removeFrom.getValueExpression(faceletContext, Object.class);
            
            if(unique != null)
				uniqueVE = unique.getValueExpression(faceletContext, Object.class);
				
			ValueExpression valueVE = value.getValueExpression(faceletContext, Object.class);
			
			ActionSource actionSource = (ActionSource) parent;
			actionSource.addActionListener(new Collector(addToVE, removeFromVE, valueVE, uniqueVE));
		}
	}
}