001/* 002 * (C) Copyright 2007 Nuxeo SAS (http://nuxeo.com/) and contributors. 003 * 004 * All rights reserved. This program and the accompanying materials 005 * are made available under the terms of the GNU Lesser General Public License 006 * (LGPL) version 2.1 which accompanies this distribution, and is available at 007 * http://www.gnu.org/licenses/lgpl.html 008 * 009 * This library is distributed in the hope that it will be useful, 010 * but WITHOUT ANY WARRANTY; without even the implied warranty of 011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 012 * Lesser General Public License for more details. 013 * 014 * Contributors: 015 * Nuxeo - initial API and implementation 016 * 017 * $Id: GenericHtmlComponentHandler.java 28610 2008-01-09 17:13:52Z sfermigier $ 018 */ 019 020package org.nuxeo.ecm.platform.ui.web.tag.handler; 021 022import javax.el.ValueExpression; 023import javax.faces.component.UIComponent; 024import javax.faces.component.ValueHolder; 025import javax.faces.view.facelets.ComponentConfig; 026import javax.faces.view.facelets.FaceletContext; 027 028import org.nuxeo.ecm.platform.ui.web.binding.DefaultValueExpression; 029 030import com.sun.faces.facelets.tag.jsf.html.HtmlComponentHandler; 031 032/** 033 * Generic HTML component handler. 034 * <p> 035 * Handler that manages a defaultValue attribute set on the tag, to default to this value when value is null or empty. 036 * 037 * @author <a href="mailto:at@nuxeo.com">Anahide Tchertchian</a> 038 */ 039public class GenericHtmlComponentHandler extends HtmlComponentHandler { 040 041 public GenericHtmlComponentHandler(ComponentConfig config) { 042 super(config); 043 } 044 045 /** 046 * Overrides the "value" value expression to handle default value mapping. 047 */ 048 public void onComponentCreated(FaceletContext ctx, UIComponent c, UIComponent parent) { 049 if (c instanceof ValueHolder) { 050 ValueExpression dve = c.getValueExpression("defaultValue"); 051 if (dve != null) { 052 c.setValueExpression("value", new DefaultValueExpression(c.getValueExpression("value"), dve)); 053 } 054 } 055 } 056 057}