name.martingeisse.wicket.util.StatelessUtil.java Source code

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Here is the source code for name.martingeisse.wicket.util.StatelessUtil.java

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/**
 * Copyright (c) 2011 Martin Geisse
 *
 * This file is distributed under the terms of the MIT license.
 */

package name.martingeisse.wicket.util;

import name.martingeisse.common.util.ParameterUtil;
import org.apache.log4j.Logger;
import org.apache.wicket.Component;
import org.apache.wicket.MarkupContainer;

/**
 * Utility methods for implementing stateless components and
 * stateless pages.
 */
public class StatelessUtil {

    /**
     * the logger
     */
    private static Logger logger = Logger.getLogger(StatelessUtil.class);

    /**
     * Dumps the stateful components in the component hierarchy, starting at
     * the specified component. The information is logged at INFO level.
     * 
     * @param root the component to start at
     */
    public static void dumpStatefulComponents(final Component root) {
        ParameterUtil.ensureNotNull(root, "root");
        if (!root.isStateless()) {
            logger.info("stateful component: " + root.getPath());
        }
        if (root instanceof MarkupContainer) {
            final MarkupContainer container = (MarkupContainer) root;
            for (final Component child : container) {
                dumpStatefulComponents(child);
            }
        }
    }

}