uk.co.modularaudio.service.imagefactory.impl.ComponentImageFactoryImpl.java Source code

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Here is the source code for uk.co.modularaudio.service.imagefactory.impl.ComponentImageFactoryImpl.java

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/**
 *
 * Copyright (C) 2015 - Daniel Hams, Modular Audio Limited
 *                      daniel.hams@gmail.com
 *
 * Mad 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.
 *
 * Mad 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 Mad.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package uk.co.modularaudio.service.imagefactory.impl;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import uk.co.modularaudio.service.configuration.ConfigurationService;
import uk.co.modularaudio.service.configuration.ConfigurationServiceHelper;
import uk.co.modularaudio.service.imagefactory.ComponentImageFactory;
import uk.co.modularaudio.util.component.ComponentWithLifecycle;
import uk.co.modularaudio.util.exception.ComponentConfigurationException;
import uk.co.modularaudio.util.exception.DatastoreException;

public class ComponentImageFactoryImpl implements ComponentWithLifecycle, ComponentImageFactory {
    private static Log log = LogFactory.getLog(ComponentImageFactoryImpl.class.getName());

    private static final String CONFIG_KEY_RESOURCE_PREFIX = ComponentImageFactoryImpl.class.getSimpleName()
            + ".ResourcePrefix";

    private final Map<String, BufferedImage> biCache = new HashMap<String, BufferedImage>();

    private ConfigurationService configurationService;

    private String resourcePrefix;

    @Override
    public void init() throws ComponentConfigurationException {
        if (configurationService == null) {
            throw new ComponentConfigurationException("Service missing dependencies. Check configuration");
        }
        final Map<String, String> errors = new HashMap<String, String>();
        resourcePrefix = ConfigurationServiceHelper.checkForSingleStringKey(configurationService,
                CONFIG_KEY_RESOURCE_PREFIX, errors);
        ConfigurationServiceHelper.errorCheck(errors);
    }

    @Override
    public void destroy() {
    }

    private BufferedImage getBufferedImageFromPath(final String filename) throws DatastoreException {
        final String pathToLoad = filename;
        BufferedImage retVal = biCache.get(pathToLoad);

        if (retVal == null) {
            try {
                final String resourcePath = resourcePrefix + pathToLoad;
                final InputStream iis = this.getClass().getResourceAsStream(resourcePath);
                if (iis == null) {
                    throw new DatastoreException("Failed to find image resource at path: " + resourcePath);
                }
                retVal = ImageIO.read(iis);
                if (log.isDebugEnabled()) {
                    log.debug("Adding " + pathToLoad + " to buffered image cache");
                }
                if (retVal.getColorModel().hasAlpha()) {
                    if (log.isWarnEnabled()) {
                        log.warn("Image " + pathToLoad + " has alpha, and probably shouldn't");
                    }
                }
                biCache.put(pathToLoad, retVal);
            } catch (final IOException ie) {
                final String msg = "Exception caught loading image " + pathToLoad + ": " + ie.toString();
                log.error(msg, ie);
                throw new DatastoreException(msg, ie);
            }
        }

        return retVal;
    }

    @Override
    public synchronized BufferedImage getBufferedImage(final String filename) throws DatastoreException {
        return getBufferedImageFromPath(filename);
    }

    public void setConfigurationService(final ConfigurationService configurationService) {
        this.configurationService = configurationService;
    }
}