org.xlcloud.console.extensions.scope.ViewScopedContext Maven / Gradle / Ivy

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/*
 * Copyright 2012 AMG.lab, a Bull Group Company
 * 
 * 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 org.xlcloud.console.extensions.scope;

import java.util.Map;

import javax.enterprise.context.spi.Context;
import javax.enterprise.context.spi.Contextual;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.Bean;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;

/**
 * Class intended to work with ViewScope annotation.
 * It stores instantiated beans for the whole cycle of view contextm
 * even if there is ajax data exchange. 
 *
 * @author "Konrad Król", AMG.net
 */
public class ViewScopedContext implements Context {

    /** {@inheritDoc} */
    @Override
    @SuppressWarnings( { "rawtypes", "unchecked" } )
    public Class getScope() {
        return ViewScoped.class;
    }

    /** {@inheritDoc} */
    @Override
    @SuppressWarnings( { "unchecked", "rawtypes" } )
    public  T get(Contextual contextual, CreationalContext creationalContext) {
        Bean beanFromContextual = (Bean) contextual;
        Map viewScopeMap = getViewScopeMap();
        
        if(viewScopeMap.containsKey(beanFromContextual.getName())) {
            return (T) viewScopeMap.get(beanFromContextual.getName());
        } else {
            T resultBean = (T) beanFromContextual.create(creationalContext);
            viewScopeMap.put(beanFromContextual.getName(), resultBean);
            
            return resultBean;
        }
    }
    
    /** {@inheritDoc} */
    @Override
    @SuppressWarnings( { "unchecked", "rawtypes" } )
    public  T get(Contextual contextual) {
        Bean bean = (Bean) contextual;
        return (T) getViewScopeMap().get(bean.getName());
    }

    /** {@inheritDoc} */
    @Override
    public boolean isActive() {
        return true;
    }

    @SuppressWarnings( "rawtypes" )
    private Map getViewScopeMap() {
        UIViewRoot viewRoot = FacesContext.getCurrentInstance().getViewRoot();
        return viewRoot.getViewMap(true);
    }
}