Component.java

/**
 * Copyright (C) 2009 eXo Platform SAS.
 *
 * This 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 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.exoplatform.webui.config;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.exoplatform.commons.serialization.api.annotations.Converted;
import org.exoplatform.webui.Util;
import org.exoplatform.webui.config.metadata.ComponentMetaData;
import org.exoplatform.webui.core.UIComponent;
import org.exoplatform.webui.core.lifecycle.Lifecycle;
import org.exoplatform.webui.event.EventListener;

/** Created by The eXo Platform SARL Author : Tuan Nguyen tuan08@users.sourceforge.net May 4, 2006 */
@Converted(ComponentConfigConverter.class)
public class Component {

    final ComponentHandle handle;

    private final String id;

    private final String type;

    private final String lifecycle;

    private final String template;

    private final String decorator;

    private final InitParams initParams;

    private final List<Validator> validators;

    private final List<Event> events;

    private final List<EventInterceptor> eventInterceptors;

    /** Declare this map as volatile to make double-check work properly **/
    private volatile Map<String, Event> eventMap;

    private Lifecycle<UIComponent> componentLifecycle;

    public Component(ComponentMetaData metaData) {
        this(new ComponentHandle(null, metaData.getId() == null ? metaData.getType() : metaData.getType() + metaData.getId()),
                metaData.getId(), metaData.getType(), metaData.getLifecycle(), metaData.getTemplate(), metaData.getDecorator(),
                metaData.getInitParams(), metaData.getValidators(), metaData.getEvents(), metaData.getEventInterceptors());
    }

    public Component(Class<?> owner, String id, String type, String lifecycle, String template, String decorator,
            InitParams initParams, List<Validator> validators, List<Event> events, List<EventInterceptor> eventInterceptors) {
        this(new ComponentHandle(owner, id == null ? type : type + ":" + id), id, type, lifecycle, template, decorator,
                initParams, validators, events, eventInterceptors);
    }

    private Component(ComponentHandle handle, String id, String type, String lifecycle, String template, String decorator,
            InitParams initParams, List<Validator> validators, List<Event> events, List<EventInterceptor> eventInterceptors) {
        this.handle = handle;
        this.id = id;
        this.type = type;
        this.lifecycle = lifecycle;
        this.template = template;
        this.decorator = decorator;
        this.initParams = initParams;
        this.validators = validators;
        this.events = events;
        this.eventInterceptors = eventInterceptors;
    }

    public String getKey() {
        return handle.getKey();
    }

    public String getId() {
        return id;
    }

    public String getType() {
        return type;
    }

    public String getLifecycle() {
        return lifecycle;
    }

    public String getTemplate() {
        return template;
    }

    public String getDecorator() {
        return decorator;
    }

    public InitParams getInitParams() {
        return initParams;
    }

    public List<Validator> getValidators() {
        return validators;
    }

    public List<Event> getEvents() {
        return events;
    }

    public List<EventInterceptor> getEventInterceptors() {
        return eventInterceptors;
    }

    public Event getUIComponentEventConfig(String eventName) throws Exception {
        if (eventMap == null) {
            synchronized (this) {
                if (eventMap == null) {
                    Map<String, Event> temporaryMap = new HashMap<String, Event>();

                    if (events == null) {
                        eventMap = temporaryMap;
                        return null;
                    }

                    for (Event event : events) {
                        createCachedEventListeners(event);
                        temporaryMap.put(event.getName(), event);
                    }

                    eventMap = temporaryMap;
                }

                return eventMap.get(eventName);
            }
        } else {
            return eventMap.get(eventName);
        }
    }

    public List<EventListener> getUIComponentEventListeners(String eventName) throws Exception {
        Event event = getUIComponentEventConfig(eventName);
        if (event == null) {
            return null;
        }
        List<EventListener> cachedListeners = event.getCachedEventListeners();
        if (cachedListeners != null) {
            return cachedListeners;
        }
        cachedListeners = new ArrayList<EventListener>();
        for (String listener : event.getListeners()) {
            if (listener.indexOf(".") < 0) {
                listener = type + "$" + listener;
            }
            EventListener eventListener = (EventListener) Util.createObject(listener, event.getInitParams());
            cachedListeners.add(eventListener);
        }
        event.setCachedEventListeners(cachedListeners);
        return cachedListeners;
    }

    private void createCachedEventListeners(Event event) throws Exception {
        List<EventListener> cachedListeners = new ArrayList<EventListener>();
        for (String listener : event.getListeners()) {
            if (listener.indexOf(".") < 0) {
                listener = type + "$" + listener;
            }
            EventListener eventListener = (EventListener) Util.createObject(listener, event.getInitParams());
            cachedListeners.add(eventListener);
        }
        event.setCachedEventListeners(cachedListeners);
    }

    public Lifecycle<UIComponent> getUIComponentLifecycle() throws Exception {
        if (componentLifecycle != null) {
            return componentLifecycle;
        }
        if (lifecycle != null) {
            componentLifecycle = (Lifecycle<UIComponent>) Util.createObject(lifecycle, null);
        } else {
            componentLifecycle = (Lifecycle<UIComponent>) Util.createObject(Lifecycle.class, null);
        }
        return componentLifecycle;
    }

}