ImageEncoderContainer.java

/**
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser 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 Lesser General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * @author Nicola Lagomarsini, GeoSolutions S.A.S., Copyright 2014
 * 
 */
package org.geowebcache.io;

import java.awt.image.RenderedImage;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.geowebcache.mime.MimeType;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

/**
 * Class  used for containing all the ImageEncoder implementations in a map. The user should only call the encode()
 * method and internally it uses the writer associated to the input mimetype.
 */
public class ImageEncoderContainer implements ApplicationContextAware {
    /**
     * Collection of all the ImageEncoder interface implementation
     */
    private Collection<ImageEncoder> encoders;
    /**
     * Map of all the encoders for mimetype
     */
    private Map<String, ImageEncoder> mapEncoders;

    public ImageEncoderContainer() {
    }

    public void encode(RenderedImage image, MimeType mimeType, Object destination,
            boolean aggressiveOutputStreamOptimization, Map<String, Object> map) throws Exception {
        if (mapEncoders == null) {
            throw new IllegalArgumentException("ApplicationContext must be set before encoding");
        }
        mapEncoders.get(mimeType.getMimeType()).encode(image, destination, aggressiveOutputStreamOptimization, mimeType,
                map);
    }

    public boolean isAggressiveOutputStreamSupported(String mimeType) {
        if (mapEncoders == null) {
            throw new IllegalArgumentException(
                    "ApplicationContext must be set before checking the AggressiveOutputStrean support");
        }
        return mapEncoders.get(mimeType).isAggressiveOutputStreamSupported();
    }

    public void setApplicationContext(ApplicationContext context) throws BeansException {
        encoders = context.getBeansOfType(ImageEncoder.class).values();
        if (encoders == null || encoders.isEmpty()) {
            throw new IllegalArgumentException("No Encoder found");
        }

        mapEncoders = new HashMap<String, ImageEncoder>();

        for (ImageEncoder encoder : encoders) {

            List<String> supportedMimeTypes = encoder.getSupportedMimeTypes();

            for (String mimeType : supportedMimeTypes) {
                if (!mapEncoders.containsKey(mimeType)) {
                    mapEncoders.put(mimeType, encoder);
                }
            }
        }
    }
}