br.com.suricattus.surispring.spring.scope.ViewScope.java Source code

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Here is the source code for br.com.suricattus.surispring.spring.scope.ViewScope.java

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/*
 * SURICATTUS
 * Copyright 2011, SURICATTUS CONSULTORIA LTDA, 
 * and individual contributors as indicated by the @authors tag
 *
 * 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 br.com.suricattus.surispring.spring.scope;

import java.util.Map;

import javax.faces.context.FacesContext;

import org.springframework.beans.factory.ObjectFactory;
import org.springframework.beans.factory.config.Scope;
import org.springframework.web.context.request.FacesRequestAttributes;

/**
 * 
 * @author Lucas Lins
 *
 */
public class ViewScope implements Scope {

    public static final String CALLBACKS = ViewScope.class.getName() + ".callbacks";
    public static final String BEANS = ViewScope.class.getName() + ".beans";

    public Object get(String name, ObjectFactory<?> objectFactory) {
        Map<String, Object> beansMap = getBeansMap();
        Object instance = beansMap.get(name);
        if (instance == null) {
            instance = objectFactory.getObject();
            synchronized (beansMap) {
                beansMap.put(name, instance);
            }
        }
        return instance;
    }

    public Object remove(String name) {
        Object instance = getBeansMap().remove(name);
        if (instance != null) {
            Runnable callback = getCallbacksMap().remove(name);
            if (callback != null) {
                callback.run();
            }
        }
        return instance;
    }

    public void registerDestructionCallback(String name, Runnable runnable) {
        getCallbacksMap().put(name, runnable);
    }

    public Object resolveContextualObject(String name) {
        return new FacesRequestAttributes(FacesContext.getCurrentInstance()).resolveReference(name);
    }

    public String getConversationId() {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        FacesRequestAttributes facesRequestAttributes = new FacesRequestAttributes(facesContext);
        return facesRequestAttributes.getSessionId() + "-" + facesContext.getViewRoot().getViewId();
    }

    /* **************************
     * PROTECTED METHODS
     * **************************/

    protected String getBeansIdentifier() {
        return BEANS;
    }

    protected String getCallbacksIdentifier() {
        return CALLBACKS;
    }

    @SuppressWarnings("unchecked")
    protected Map<String, Object> getBeansMap() {
        return (Map<String, Object>) FacesContext.getCurrentInstance().getViewRoot().getViewMap()
                .get(getBeansIdentifier());
    }

    @SuppressWarnings("unchecked")
    protected Map<String, Runnable> getCallbacksMap() {
        return (Map<String, Runnable>) FacesContext.getCurrentInstance().getViewRoot().getViewMap()
                .get(getCallbacksIdentifier());
    }

}