com.w4t.webfileuploadkit.WebFileUploadRenderer.java Source code

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Here is the source code for com.w4t.webfileuploadkit.WebFileUploadRenderer.java

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/*******************************************************************************
 * Copyright (c) 2002-2006 Innoopract Informationssysteme GmbH.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Innoopract Informationssysteme GmbH - initial API and implementation
 ******************************************************************************/
package com.w4t.webfileuploadkit;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.fileupload.FileItem;
import org.eclipse.rwt.internal.lifecycle.HtmlResponseWriter;
import org.eclipse.rwt.internal.service.ContextProvider;
import org.eclipse.rwt.internal.util.HTML;

import com.w4t.*;
import com.w4t.engine.lifecycle.standard.EventQueue;
import com.w4t.engine.requests.IFileUploadRequest;
import com.w4t.event.WebFileUploadEvent;
import com.w4t.internal.adaptable.IFileUploadAdapter;

public abstract class WebFileUploadRenderer extends Renderer {

    public void readData(final WebComponent component) {
        HttpServletRequest request = ContextProvider.getRequest();
        String fileName = request.getParameter(component.getUniqueID());
        // don't ask for fileName == null; in this case there is actually an upload
        if (!"".equals(fileName)) {
            IFileUploadRequest uploadRequest = (IFileUploadRequest) request;
            WebFileUpload upload = (WebFileUpload) component;
            FileItem uploadedFile = uploadRequest.getFileItem(upload.getUniqueID());
            if (uploadedFile.getSize() != 0) {
                IFileUploadAdapter adapter = (IFileUploadAdapter) upload.getAdapter(IFileUploadAdapter.class);
                adapter.setFileItem(uploadedFile);

                int id = WebFileUploadEvent.FILEUPLOADED;
                WebFileUploadEvent evt = new WebFileUploadEvent(upload, id);
                EventQueue.getEventQueue().addToQueue(evt);
            }
        }
    }

    public void render(final WebComponent component) throws IOException {
        WebFileUpload fileUpload = (WebFileUpload) component;
        WebForm webForm = fileUpload.getWebForm();
        IFileUploadAdapter adapter = (IFileUploadAdapter) webForm.getAdapter(IFileUploadAdapter.class);
        adapter.setMultipartFormEncoding(true);
        HtmlResponseWriter out = getResponseWriter();
        out.startElement(HTML.INPUT, null);
        out.writeAttribute(HTML.TYPE, HTML.FILE, null);
        out.writeAttribute(HTML.NAME, fileUpload.getUniqueID(), null);
        RenderUtil.writeUniversalAttributes(fileUpload);
        createSizeAttribute(fileUpload);
        appendFocusHandling(fileUpload);
        out.endElement(HTML.INPUT);
    }

    // Helping Methods
    //////////////////

    abstract void appendFocusHandling(final WebFileUpload fileUpload) throws IOException;

    private void createSizeAttribute(final WebFileUpload fileUpload) throws IOException {
        int size = fileUpload.getSize();
        if (size >= 0) {
            HtmlResponseWriter out = getResponseWriter();
            out.writeAttribute(HTML.SIZE, String.valueOf(size), null);
        }
    }
}