root/org.nuxeo.ecm.platform/trunk/nuxeo-platform-ui-web/src/main/java/org/nuxeo/ecm/platform/ui/web/tag/handler/GenericHtmlComponentHandler.java

/*
 * (C) Copyright 2007 Nuxeo SAS (http://nuxeo.com/) and contributors.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser General Public License
 * (LGPL) version 2.1 which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/lgpl.html
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * Contributors:
 *     Nuxeo - initial API and implementation
 *
 * $Id$
 */

package org.nuxeo.ecm.platform.ui.web.tag.handler;

import javax.faces.component.ValueHolder;

import org.nuxeo.ecm.platform.ui.web.tag.jsf.GenericValueHolderRule;

import com.sun.facelets.tag.MetaRuleset;
import com.sun.facelets.tag.jsf.ComponentConfig;
import com.sun.facelets.tag.jsf.html.HtmlComponentHandler;

/**
 * Generic HTML component handler.
 *
 * Handler evaluating the "value" attribute as a regular value expression, or
 * invoking a method expression.
 *
 * The method can have parameters and the expression must use parentheses even
 * if no parameters are needed.
 *
 * @author <a href="mailto:at@nuxeo.com">Anahide Tchertchian</a>
 *
 */
public class GenericHtmlComponentHandler extends HtmlComponentHandler {

    public GenericHtmlComponentHandler(ComponentConfig config) {
        super(config);
        // TODO Auto-generated constructor stub
    }

    /**
     * Create meta rule set as regular html component, overriding value holder
     * rule to use a generic value holder rule.
     */
    @Override
    protected MetaRuleset createMetaRuleset(Class type) {
        MetaRuleset m = super.createMetaRuleset(type);
        // alias value so that regular ValueHolder rule does not apply, actually
        // this is not necessary as last rule added applies.
        if (ValueHolder.class.isAssignableFrom(type)) {
            m.alias("value", "genericValue");
            m.addRule(GenericValueHolderRule.Instance);
        }
        return m;
    }

}