com.jgaap.backend.EventCullers.java Source code

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Here is the source code for com.jgaap.backend.EventCullers.java

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/*
 * JGAAP -- a graphical program for stylometric authorship attribution
 * Copyright (C) 2009,2011 by Patrick Juola
 *
 * 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 com.jgaap.backend;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.jgaap.generics.EventCuller;

/**
 * Instances new Event Cullers based on display name.
 * If parameters are also passed in the form DisplayName|name:value|name:value they are added to the Event Culler before it is returned
 *
 * @author John Noecker
 * @since 5.0.0
 */

public class EventCullers {

    private static final ImmutableList<EventCuller> EVENT_CULLERS = loadEventCullers();
    private static final ImmutableMap<String, EventCuller> eventCullers = loadEventCullersMap();

    /**
     * A read-only list of the EventCullers
     */
    public static List<EventCuller> getEventCullers() {
        return EVENT_CULLERS;
    }

    private static ImmutableList<EventCuller> loadEventCullers() {
        List<Object> objects = AutoPopulate.findObjects("com.jgaap.eventCullers", EventCuller.class);
        for (Object tmp : AutoPopulate.findClasses("com.jgaap.generics", EventCuller.class)) {
            objects.addAll(AutoPopulate.findObjects("com.jgaap.eventCullers", (Class<?>) tmp));
        }
        List<EventCuller> cullers = new ArrayList<EventCuller>(objects.size());
        for (Object tmp : objects) {
            cullers.add((EventCuller) tmp);
        }
        Collections.sort(cullers);
        return ImmutableList.copyOf(cullers);
    }

    private static ImmutableMap<String, EventCuller> loadEventCullersMap() {
        // Load the classifiers dynamically
        ImmutableMap.Builder<String, EventCuller> builder = ImmutableMap.builder();
        for (EventCuller eventCuller : EVENT_CULLERS) {
            builder.put(eventCuller.displayName().toLowerCase().trim(), eventCuller);
        }
        return builder.build();
    }

    public static EventCuller getEventCuller(String action) throws Exception {
        EventCuller eventCuller;
        String[] tmp = action.split("\\|", 2);
        action = tmp[0].trim().toLowerCase();
        if (eventCullers.containsKey(action)) {
            eventCuller = eventCullers.get(action).getClass().newInstance();
        } else {
            throw new Exception("Event culler " + action + " not found!");
        }
        if (tmp.length > 1) {
            eventCuller.setParameters(tmp[1]);
        }
        return eventCuller;
    }
}