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package javax.faces.view.facelets;

import javax.faces.view.BehaviorHolderAttachedObjectHandler;

/**
 * The {@link FaceletHandler} that
 * corresponds to attached objects that represent an instance of {@link
 * javax.faces.component.behavior.ClientBehavior} that must be added to
 * the parent component, which must implement {@link
 * javax.faces.component.behavior.ClientBehaviorHolder}, with a call to
 * {@link
 * javax.faces.component.behavior.ClientBehaviorHolder#addClientBehavior}.
 * The current specification defines one Facelet element for this sort
 * of attached object, <f:ajax>.
 */ 

public class BehaviorHandler extends FaceletsAttachedObjectHandler implements BehaviorHolderAttachedObjectHandler {

    private final TagAttribute event;
    
    private String behaviorId;

    private TagHandlerDelegate helper;

    public BehaviorHandler(BehaviorConfig config) {
        super(config);
        this.behaviorId = config.getBehaviorId();
        this.event = this.getAttribute("event");
        if (null != event && !event.isLiteral()){
            throw new TagException(this.tag, "The 'event' attribute for behavior tag must be a literal");
        }
    }
    
    public TagAttribute getEvent() {
        return this.event;
    }
    
    public String getEventName() {
        if (null != getEvent()) {
            return getEvent().getValue();
        }
        return null;
    }
    
    @Override
    protected TagHandlerDelegate getTagHandlerDelegate() {
        if (null == helper) {
            helper = delegateFactory.createBehaviorHandlerDelegate(this);
        }
        return helper;
    }

    public String getBehaviorId() {
        return behaviorId;
    }

}