001/*
002 * (C) Copyright 2006-2007 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     <a href="mailto:[email protected]">Anahide Tchertchian</a>
018 *
019 * $Id: UIOutputFileCommandLink.java 20116 2007-06-06 09:13:31Z sfermigier $
020 */
021
022package org.nuxeo.ecm.platform.ui.web.component.file;
023
024import javax.el.MethodExpression;
025import javax.faces.component.UIComponent;
026import javax.faces.component.html.HtmlCommandLink;
027import javax.faces.context.FacesContext;
028
029import org.nuxeo.ecm.platform.ui.web.binding.DownloadMethodExpression;
030
031/**
032 * Command Link with an overriden getActionExpression method. This is used to get the action expression querying the
033 * parent of this component, an {@link UIOutputFile} component which values may be changing if it is itself within an
034 * {@link UIInputFile} component.
035 *
036 * @author <a href="mailto:[email protected]">Anahide Tchertchian</a>
037 */
038public class UIOutputFileCommandLink extends HtmlCommandLink {
039
040    public static final String COMPONENT_TYPE = UIOutputFileCommandLink.class.getName();
041
042    @Override
043    public MethodExpression getActionExpression() {
044        UIComponent parent = getParent();
045        if (parent instanceof UIOutputFile) {
046            UIOutputFile outputFile = (UIOutputFile) parent;
047            FacesContext context = FacesContext.getCurrentInstance();
048            return new DownloadMethodExpression(outputFile.getBlobExpression(context),
049                    outputFile.getFileNameExpression(context));
050        }
051        return super.getActionExpression();
052    }
053
054}