at.gv.egiz.bku.binding.MultiPartFormDataInputDecoder.java Source code

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Here is the source code for at.gv.egiz.bku.binding.MultiPartFormDataInputDecoder.java

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/*
 * Copyright 2011 by Graz University of Technology, Austria
 * MOCCA has been developed by the E-Government Innovation Center EGIZ, a joint
 * initiative of the Federal Chancellery Austria and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 */

package at.gv.egiz.bku.binding;

import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;

import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.FileUpload;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.RequestContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import at.gv.egiz.bku.slexceptions.SLRuntimeException;

/**
 * The code to detect the multipart boundary is based on
 * org.apache.commons.fileupload.FileUploadBase of
 * http://commons.apache.org/fileupload/
 * 
 * @author wbauer
 * 
 */
public class MultiPartFormDataInputDecoder implements InputDecoder, RequestContext {

    private final Logger log = LoggerFactory.getLogger(MultiPartFormDataInputDecoder.class);

    private String contentType;
    private InputStream stream;

    @Override
    public void setContentType(String contentType) {
        this.contentType = contentType;
    }

    @Override
    public String getCharacterEncoding() {
        return null;
    }

    @Override
    public int getContentLength() {
        return 0;
    }

    @Override
    public String getContentType() {
        return contentType;
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return stream;
    }

    @Override
    public Iterator<FormParameter> getFormParameterIterator() {
        try {
            FileUpload fup = new FileUpload();
            FileItemIterator fit = fup.getItemIterator(this);
            return new IteratorDelegator(fit);
        } catch (Exception iox) {
            log.error("Cannot decode multipart form data stream " + iox);
            throw new SLRuntimeException(iox);
        }
    }

    @Override
    public void setInputStream(InputStream is) {
        stream = is;
    }

    static class IteratorDelegator implements Iterator<FormParameter> {

        private final Logger log = LoggerFactory.getLogger(MultiPartFormDataInputDecoder.class);

        private FileItemIterator fileItemIterator;

        public IteratorDelegator(FileItemIterator fit) {
            fileItemIterator = fit;
        }

        @Override
        public boolean hasNext() {
            try {
                return fileItemIterator.hasNext();
            } catch (FileUploadException e) {
                log.error("Failed to get next file item.", e);
                throw new SLRuntimeException(e);
            } catch (IOException e) {
                log.error("Failed to get next file item.", e);
                throw new SLRuntimeException(e);
            }
        }

        @Override
        public FormParameter next() {
            try {
                FileItemStream item = fileItemIterator.next();
                return new FormParameterImpl(item.getContentType(), item.getFieldName(), item.openStream(),
                        item.getHeaders());
            } catch (FileUploadException e) {
                log.error("Failed to get next file item.", e);
                throw new SLRuntimeException(e);
            } catch (IOException e) {
                log.error("Failed to get next file item.", e);
                throw new SLRuntimeException(e);
            }
        }

        @Override
        public void remove() {
            throw new UnsupportedOperationException("Remove not supported");
        }
    }
}