jease.site.Streams.java Source code

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Here is the source code for jease.site.Streams.java

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/*
Copyright (C) 2016 maik.jablonski@jease.org
    
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
    
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
    
You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package jease.site;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import jease.Names;
import jease.Registry;
import jfix.util.Images;

import org.apache.commons.lang3.math.NumberUtils;

/**
 * Service to stream binary contents to client.
 */
public class Streams {

    /**
     * Write given file to response.
     * 
     * If the given content type denotes a browser supported image, the image
     * will be automatically scaled if either "scale" is present as request
     * paramter or JEASE_IMAGE_LIMIT is set in Registry.
     */
    public static void write(HttpServletRequest request, HttpServletResponse response, File file,
            String contentType) throws IOException {
        if (Images.isBrowserCompatible(contentType)) {
            int scale = NumberUtils.toInt(request.getParameter("scale"));
            if (scale > 0) {
                java.io.File scaledImage = Images.scale(file, scale);
                scaledImage.deleteOnExit();
                response.setContentType(contentType);
                response.setContentLength((int) scaledImage.length());
                Files.copy(scaledImage.toPath(), response.getOutputStream());
                return;
            }
            int limit = NumberUtils.toInt(Registry.getParameter(Names.JEASE_IMAGE_LIMIT));
            if (limit > 0) {
                java.io.File scaledImage = Images.limit(file, limit);
                scaledImage.deleteOnExit();
                response.setContentType(contentType);
                response.setContentLength((int) scaledImage.length());
                Files.copy(scaledImage.toPath(), response.getOutputStream());
                return;
            }

        }
        response.setContentType(contentType);
        response.setContentLength((int) file.length());
        Files.copy(file.toPath(), response.getOutputStream());
    }
}