org.lunifera.runtime.web.vaadin.common.sharedState.SharedStateUtil.java Source code

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Here is the source code for org.lunifera.runtime.web.vaadin.common.sharedState.SharedStateUtil.java

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/**
 * Copyright (c) 2011 - 2014, Lunifera GmbH (Gross Enzersdorf), Loetz KG (Heidelberg)
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors: 
 *       Florian Pirchner - Initial implementation
 */
package org.lunifera.runtime.web.vaadin.common.sharedState;

import java.util.Map;

import org.lunifera.runtime.common.state.ISharedStateContext;

import com.vaadin.ui.AbstractComponent;
import com.vaadin.ui.Component;

/**
 * Vaadin util to find a shared state if available.
 */
public class SharedStateUtil {

    /**
     * Tries to find the {@link ISharedStateContext} registered with the Vaadin
     * component. It also iterates the parents recursively to find it.
     * 
     * @param component
     * @return
     */
    public static ISharedStateContext getSharedState(Component component) {
        if (component == null) {
            return null;
        }
        if (component instanceof AbstractComponent) {
            AbstractComponent comp = (AbstractComponent) component;
            if (comp.getData() != null && (comp.getData() instanceof Map)) {
                @SuppressWarnings("unchecked")
                Map<Object, Object> map = (Map<Object, Object>) comp.getData();
                ISharedStateContext sharedState = (ISharedStateContext) map.get(ISharedStateContext.class);
                if (sharedState != null) {
                    return sharedState;
                }
            }
        }
        return getSharedState(component.getParent());
    }

}