ch.systemsx.cisd.openbis.generic.client.web.server.UploadedFilesBean.java Source code

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Here is the source code for ch.systemsx.cisd.openbis.generic.client.web.server.UploadedFilesBean.java

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/*
 * Copyright 2008 ETH Zuerich, CISD
 *
 * 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 ch.systemsx.cisd.openbis.generic.client.web.server;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.springframework.web.multipart.MultipartFile;

import ch.systemsx.cisd.base.exceptions.IOExceptionUnchecked;
import ch.systemsx.cisd.common.spring.IUncheckedMultipartFile;
import ch.systemsx.cisd.common.spring.MultipartFileAdapter;

/**
 * A bean that contains the uploaded files.
 * 
 * @author Christian Ribeaud
 */
public final class UploadedFilesBean {
    private static final String CLASS_SIMPLE_NAME = UploadedFilesBean.class.getSimpleName();

    private List<IUncheckedMultipartFile> multipartFiles = new ArrayList<IUncheckedMultipartFile>();

    private final File createTempFile() throws IOException {
        final File tempFile = File.createTempFile(CLASS_SIMPLE_NAME, null);
        tempFile.deleteOnExit();
        return tempFile;
    }

    public final void addMultipartFile(final MultipartFile multipartFile) {
        assert multipartFile != null : "Unspecified multipart file.";
        try {
            final File tempFile = createTempFile();
            multipartFile.transferTo(tempFile);
            final FileMultipartFileAdapter multipartFileAdapter = new FileMultipartFileAdapter(multipartFile,
                    tempFile);
            multipartFiles.add(multipartFileAdapter);
        } catch (final IOException ex) {
            throw new IOExceptionUnchecked(ex);
        }
    }

    public final Iterable<IUncheckedMultipartFile> iterable() {
        return multipartFiles;
    }

    /**
     * Returns the number of files uploaded.
     */
    public final int size() {
        return multipartFiles.size();
    }

    /**
     * Deletes the transferred files.
     */
    public final void deleteTransferredFiles() {
        for (final IUncheckedMultipartFile multipartFile : iterable()) {
            ((FileMultipartFileAdapter) multipartFile).destFile.delete();
        }
    }

    //
    // Helper classes
    //

    private final static class FileMultipartFileAdapter extends MultipartFileAdapter {
        private final File destFile;

        FileMultipartFileAdapter(final MultipartFile multipartFile, final File destFile) {
            super(multipartFile);
            this.destFile = destFile;
        }

        //
        // MultipartFileAdapter
        //

        @Override
        public final byte[] getBytes() {
            try {
                return FileUtils.readFileToByteArray(destFile);
            } catch (final IOException ex) {
                throw new IOExceptionUnchecked(ex);
            }
        }

        @Override
        public final InputStream getInputStream() {
            try {
                return FileUtils.openInputStream(destFile);
            } catch (final IOException ex) {
                throw new IOExceptionUnchecked(ex);
            }
        }

        @Override
        public final void transferTo(final File dest) {
            throw new UnsupportedOperationException();
        }
    }
}