com.igormaznitsa.mindmap.plugins.external.ExternalPlugins.java Source code

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Here is the source code for com.igormaznitsa.mindmap.plugins.external.ExternalPlugins.java

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/*
 * Copyright 2016 Igor Maznitsa.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.igormaznitsa.mindmap.plugins.external;

import java.io.File;
import java.util.Collection;
import java.util.Locale;
import javax.annotation.Nonnull;
import org.apache.commons.io.FileUtils;
import com.igormaznitsa.commons.version.Version;
import com.igormaznitsa.commons.version.VersionValidator;
import com.igormaznitsa.meta.common.utils.GetUtils;
import com.igormaznitsa.mindmap.model.logger.Logger;
import com.igormaznitsa.mindmap.model.logger.LoggerFactory;
import com.igormaznitsa.mindmap.plugins.MindMapPluginRegistry;
import com.igormaznitsa.mindmap.plugins.api.MindMapPlugin;

public class ExternalPlugins {

    private static final Logger LOGGER = LoggerFactory.getLogger(ExternalPlugins.class);

    private final File pluginsFolder;
    private static final String PLUGIN_EXTENSION = "mmdp";
    private final VersionValidator pluginApiValidator;

    public ExternalPlugins(@Nonnull final File pluginsFolder) {
        this.pluginApiValidator = new VersionValidator(">=" + MindMapPlugin.API.toString());
        this.pluginsFolder = pluginsFolder;
        LOGGER.info("External plugins folder is " + pluginsFolder);
    }

    public void init() {
        final Collection<File> plugins = FileUtils.listFiles(this.pluginsFolder,
                new String[] { PLUGIN_EXTENSION, PLUGIN_EXTENSION.toUpperCase(Locale.ENGLISH) }, false);
        LOGGER.info("Detected " + plugins.size() + " plugin(s)");
        for (final File plugin : plugins) {
            try {
                final PluginClassLoader loader = new PluginClassLoader(plugin);
                final String pluginTitle = GetUtils.ensureNonNull(loader.getAttributes(Attribute.TITLE),
                        "<unknown>");
                final Version pluginVersion = new Version(loader.getAttributes(Attribute.VERSION));

                LOGGER.info(String.format("Detected plugin %s [%s]", pluginTitle, pluginVersion.toString()));
                final Version pluginApiVersion = loader.getApiVersion();
                if (this.pluginApiValidator.isValid(pluginApiVersion)) {
                    LOGGER.info(String.format("Plugin %s [%s] is valid for API", pluginTitle,
                            pluginVersion.toString()));
                    final String[] classes = loader.extractPluginClassNames();
                    for (final String klazzName : classes) {
                        LOGGER.info(String.format("Loading plugin class %s from %s", klazzName, pluginTitle));
                        final MindMapPlugin pluginInstance = (MindMapPlugin) loader.loadClass(klazzName)
                                .newInstance();
                        MindMapPluginRegistry.getInstance().registerPlugin(pluginInstance);
                    }
                } else {
                    LOGGER.warn(String.format("Plugin %s [%s] is not valid for API : %s", pluginTitle,
                            pluginVersion.toString(), pluginApiVersion.toString()));
                }
            } catch (Exception ex) {
                LOGGER.error("Can't load plugin from : " + plugin.getAbsolutePath(), ex);
            }
        }
    }
}