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package javax.faces.view.facelets;

import javax.faces.view.ValueHolderAttachedObjectHandler;

/**
 * Handles setting a {@link
 * javax.faces.convert.Converter} instance on a {@link
 * javax.faces.component.ValueHolder} parent. Will wire all attributes
 * set to the Converter instance created/fetched. Uses the
 * "binding" attribute for grabbing instances to apply attributes
 * to. 
 *
 * Will only set/create
 * Converter if the passed UIComponent's
 * parent is null, signifying that it wasn't
 * restored from an existing tree.
 * 
 */
public class ConverterHandler extends FaceletsAttachedObjectHandler implements ValueHolderAttachedObjectHandler {

    
    private String converterId;
    
    
    private TagHandlerDelegate helper;

    public ConverterHandler(ConverterConfig config) {
        super(config);
        this.converterId = config.getConverterId();
    }

    @Override
    protected TagHandlerDelegate getTagHandlerDelegate() {
        if (null == helper) {
            helper = delegateFactory.createConverterHandlerDelegate(this);
        }
        return helper;

    }

    public String getConverterId(FaceletContext ctx) {
        if (converterId == null) {
            TagAttribute idAttr = getAttribute("converterId");
            if (idAttr == null) {
                return null;
            } else {
                return idAttr.getValue(ctx);
            }
        }
        return converterId;
    }
    
}