/*
* Copyright 2012 Objectos, Fábrica de Software LTDA.
*
* 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 br.com.objectos.comuns.web.upload;
import java.io.IOException;
import java.util.Iterator;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import com.google.common.base.Preconditions;
import com.google.common.collect.AbstractIterator;
/**
* @author marcio.endo@objectos.com.br (Marcio Endo)
*/
class UploadRequestApacheCommons implements UploadRequest {
private final TheIterable iterable;
public UploadRequestApacheCommons(HttpServletRequest request) {
this.iterable = new TheIterable(request);
}
@Override
public Iterable<PotentialFile> getPotentialFiles() {
return iterable;
}
@Override
public UploadedForm getUploadedForm() {
return iterable.getForm();
}
private static class TheIterable implements Iterable<PotentialFile> {
private final HttpServletRequest request;
private final MapUploadedForm form = new MapUploadedForm();
private boolean formReady = false;
public TheIterable(HttpServletRequest request) {
this.request = request;
}
@Override
public Iterator<PotentialFile> iterator() {
return new TheIterator();
}
public MapUploadedForm getForm() {
Preconditions.checkState(formReady,
"You should iterate through the files before calling this method.");
return form;
}
private class TheIterator extends AbstractIterator<PotentialFile> {
private final FileItemIterator delegate;
private final PotentialFile firstAndOnly;
private boolean stopNow = false;
public TheIterator() {
ServletFileUpload upload = new ServletFileUpload();
FileItemIterator delegate = null;
PotentialFile firstAndOnly = null;
try {
delegate = upload.getItemIterator(request);
} catch (FileUploadException e) {
firstAndOnly = new PotentialFileFailed(e);
} catch (IOException e) {
firstAndOnly = new PotentialFileFailed(e);
}
this.delegate = delegate;
this.firstAndOnly = firstAndOnly;
}
@Override
protected PotentialFile computeNext() {
if (stopNow) {
return theEnd();
}
if (firstAndOnly != null) {
stopNow = true;
return firstAndOnly;
}
PotentialFile next = null;
try {
next = getNext();
} catch (FileUploadException e) {
next = new PotentialFileFailed(e);
} catch (IOException e) {
next = new PotentialFileFailed(e);
}
return next != null ? next : theEnd();
}
private PotentialFile theEnd() {
formReady = true;
return endOfData();
}
private PotentialFile getNext() throws FileUploadException, IOException {
PotentialFile next = null;
while (delegate.hasNext()) {
FileItemStream stream = delegate.next();
if (!stream.isFormField()) {
UploadedFile file = new UploadedFileApacheCommons(stream);
next = new PotentialFileSucceeded(file);
break;
} else {
UploadedFormFieldApacheCommons field = new UploadedFormFieldApacheCommons(stream);
form.add(field);
}
}
return next;
}
}
}
}