001/*
002 * (C) Copyright 2006-2007 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 *     <a href="mailto:at@nuxeo.com">Anahide Tchertchian</a>
016 *
017 * $Id: UIOutputFileCommandLink.java 20116 2007-06-06 09:13:31Z sfermigier $
018 */
019
020package org.nuxeo.ecm.platform.ui.web.component.file;
021
022import javax.el.MethodExpression;
023import javax.faces.component.UIComponent;
024import javax.faces.component.html.HtmlCommandLink;
025import javax.faces.context.FacesContext;
026
027import org.nuxeo.ecm.platform.ui.web.binding.DownloadMethodExpression;
028
029/**
030 * Command Link with an overriden getActionExpression method. This is used to get the action expression querying the
031 * parent of this component, an {@link UIOutputFile} component which values may be changing if it is itself within an
032 * {@link UIInputFile} component.
033 *
034 * @author <a href="mailto:at@nuxeo.com">Anahide Tchertchian</a>
035 */
036public class UIOutputFileCommandLink extends HtmlCommandLink {
037
038    public static final String COMPONENT_TYPE = UIOutputFileCommandLink.class.getName();
039
040    @Override
041    public MethodExpression getActionExpression() {
042        UIComponent parent = getParent();
043        if (parent instanceof UIOutputFile) {
044            UIOutputFile outputFile = (UIOutputFile) parent;
045            FacesContext context = FacesContext.getCurrentInstance();
046            return new DownloadMethodExpression(outputFile.getBlobExpression(context),
047                    outputFile.getFileNameExpression(context));
048        }
049        return super.getActionExpression();
050    }
051
052}