uk.ac.lancs.e_science.fileUpload.UploadRenderer.java Source code

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Here is the source code for uk.ac.lancs.e_science.fileUpload.UploadRenderer.java

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/*************************************************************************************
 * Copyright (c) 2006, 2008 The Sakai Foundation
 *
 * Licensed under the Educational Community License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.osedu.org/licenses/ECL-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
    
 *************************************************************************************/
package uk.ac.lancs.e_science.fileUpload;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import javax.faces.component.EditableValueHolder;
import javax.faces.component.UIComponent;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.el.ValueBinding;
import javax.faces.render.Renderer;
import javax.servlet.http.HttpServletRequest;

import org.apache.commons.fileupload.FileItem;

public class UploadRenderer extends Renderer {
    public void encodeBegin(FacesContext context, UIComponent component) throws IOException {
        if (!component.isRendered())
            return;
        ResponseWriter writer = context.getResponseWriter();

        String clientId = component.getClientId(context);

        writer.startElement("input", component);
        writer.writeAttribute("type", "file", "type");
        writer.writeAttribute("name", clientId, "clientId");
        writer.writeAttribute("size", "50", null);
        writer.endElement("input");
        writer.flush();
    }

    public void decode(FacesContext context, UIComponent component) {
        ExternalContext external = context.getExternalContext();
        HttpServletRequest request = (HttpServletRequest) external.getRequest();
        String clientId = component.getClientId(context);
        FileItem item = (FileItem) request.getAttribute(clientId);

        Object newValue;
        ValueBinding binding = component.getValueBinding("value");
        if (binding != null) {
            if (binding.getType(context) == byte[].class) {
                newValue = item.get();
            }
            if (binding.getType(context) == FileItem.class) {
                newValue = item;
            } else {
                String encoding = request.getCharacterEncoding();
                if (encoding != null)
                    try {
                        newValue = item.getString(encoding);
                    } catch (UnsupportedEncodingException ex) {
                        newValue = item.getString();
                    }
                else
                    newValue = item.getString();
            }
            ((EditableValueHolder) component).setSubmittedValue(newValue);
        }

        Object target;
        binding = component.getValueBinding("target");
        if (binding != null)
            target = binding.getValue(context);
        else
            target = component.getAttributes().get("target");

    }
}