edu.umn.msi.tropix.webgui.client.utils.FileSizeUtils.java Source code

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/*******************************************************************************
 * Copyright 2009 Regents of the University of Minnesota. All rights
 * reserved.
 * Copyright 2009 Mayo Foundation for Medical Education and Research.
 * All rights reserved.
 *
 * This program is made available under the terms of the Eclipse
 * Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 *
 * 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 INCLUDING, WITHOUT LIMITATION, ANY WARRANTIES OR CONDITIONS
 * OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A
 * PARTICULAR PURPOSE.  See the License for the specific language
 * governing permissions and limitations under the License.
 *
 * Contributors:
 * Minnesota Supercomputing Institute - initial API and implementation
 ******************************************************************************/

package edu.umn.msi.tropix.webgui.client.utils;

import com.google.gwt.i18n.client.NumberFormat;

public class FileSizeUtils {
    private static final long BYTES_PER_KILOBYTE = 1024;
    private static final long BYTES_PER_MEGABYTE = 1024 * 1024;
    private static final long BYTES_PER_GIGABYTE = 1024 * 1024 * 1024;

    private static String divide(final long numerator, final long denominator) {
        final NumberFormat formatted = NumberFormat.getFormat("#######.00");
        return formatted.format((1.0 * numerator) / denominator);
    }

    /**
     * 
     * @param fileSize File size in bytes.
     * @return A human readable string representing the file size.
     */
    public static String formatFileSize(final long fileSize) {
        String fileSizeStr = fileSize + " bytes";
        if (fileSize >= BYTES_PER_GIGABYTE) {
            fileSizeStr = divide(fileSize, BYTES_PER_GIGABYTE) + " gigabytes";
        } else if (fileSize >= BYTES_PER_MEGABYTE) {
            fileSizeStr = divide(fileSize, BYTES_PER_MEGABYTE) + " megabytes";
        } else if (fileSize >= BYTES_PER_KILOBYTE) {
            fileSizeStr = divide(fileSize, BYTES_PER_KILOBYTE) + " kilobytes";
        }
        return fileSizeStr;
    }

}