filters.BaseFilter.java Source code

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Here is the source code for filters.BaseFilter.java

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/*******************************************************************************
 * Instafilter, a RESTful API for manipulating images and applying customizable filters in real-time.
 * 
 * Copyright (C) 2012  Marco Palladino
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package filters;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

import javax.imageio.ImageIO;

import org.apache.commons.lang.StringUtils;

import exceptions.EmptyExtensionException;
import exceptions.FileTooBigException;
import exceptions.NotSupportedFormatException;

public abstract class BaseFilter {

    public static final int FILE_SIZE_LIMIT = 4194304;

    public void filter(URL url, OutputStream output, FilterOptions options)
            throws IOException, EmptyExtensionException, NotSupportedFormatException, FileTooBigException {
        String format = SupportedFormats.supportFormat(url.toString());
        if (StringUtils.isBlank(format)) {
            throw new NotSupportedFormatException();
        }

        // Calculate size
        HttpURLConnection openConnection = (HttpURLConnection) url.openConnection();
        int contentLength = openConnection.getContentLength();
        if (contentLength > FILE_SIZE_LIMIT) {
            throw new FileTooBigException();
        }
        openConnection.disconnect();

        BufferedImage read = ImageIO.read(url);
        doFilter(read, output, options, format);
    }

    public void filter(URL url, OutputStream output)
            throws IOException, EmptyExtensionException, NotSupportedFormatException, FileTooBigException {
        filter(url, output, null);
    }

    public void filter(File file, OutputStream output, FilterOptions options)
            throws IOException, EmptyExtensionException, NotSupportedFormatException, FileTooBigException {
        if (file.length() > FILE_SIZE_LIMIT) { // 
            throw new FileTooBigException();
        }
        String format = SupportedFormats.supportFormat(file.getAbsolutePath());
        if (StringUtils.isBlank(format)) {
            throw new NotSupportedFormatException();
        }
        doFilter(ImageIO.read(file), output, options, format);
    }

    public void filter(File file, OutputStream output)
            throws IOException, EmptyExtensionException, NotSupportedFormatException, FileTooBigException {
        filter(file, output, null);
    }

    protected abstract void doFilter(BufferedImage image, OutputStream output, FilterOptions options, String format)
            throws IOException;

}