// Copyright 2004, 2005 The Apache Software Foundation
//
// Licensed under the Apache 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.apache.org/licenses/LICENSE-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 org.apache.tapestry.form;
import org.apache.tapestry.IForm;
import org.apache.tapestry.IMarkupWriter;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.multipart.MultipartDecoder;
import org.apache.tapestry.request.IUploadFile;
/**
* Form element used to upload files. For the momement, it is necessary to explicitly set the form's
* enctype to "multipart/form-data". [ <a
* href="../../../../../ComponentReference/Upload.html">Component Reference </a>]
*
* @author Howard Lewis Ship
* @since 1.0.8
*/
public abstract class Upload extends AbstractFormComponent
{
protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
{
IForm form = getForm(cycle);
if (form.wasPrerendered(writer, this))
return;
String name = form.getElementId(this);
if (form.isRewinding())
{
if (!isDisabled())
{
IUploadFile file = getDecoder().getFileUpload(name);
setFile(file);
}
return;
}
// Force the form to use the correct encoding type for
// file uploads.
form.setEncodingType("multipart/form-data");
writer.beginEmpty("input");
writer.attribute("type", "file");
writer.attribute("name", name);
if (isDisabled())
writer.attribute("disabled", "disabled");
// Size, width, etc. can be specified as informal parameters
// (Not making the same mistake here that was made with TextField
// and friends).
renderInformalParameters(writer, cycle);
}
public abstract boolean isDisabled();
public abstract void setFile(IUploadFile file);
public abstract MultipartDecoder getDecoder();
}