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package org.jboss.spring.vfs.context;

import org.springframework.context.ApplicationContextException;
import org.springframework.util.ClassUtils;
import org.springframework.util.ReflectionUtils;

/**
 * @author Marius Bogoevici
 */
public class ContextClassUtil {

    static final String VFS_APPLICATION_CONTEXT_CLASS_NAME = "org.jboss.spring.vfs.context.VFSXmlWebApplicationContext";

    public static boolean isJBossAS5orHigher() {
        try {
            Class jBossVersionClass = DelegatingContextLoaderListener.class.getClassLoader().loadClass("org.jboss.Version");
            Object versionObject = ReflectionUtils.invokeMethod(ReflectionUtils.findMethod(jBossVersionClass, "getInstance"), null);
            Integer majorVersion = (Integer) ReflectionUtils.invokeMethod(ReflectionUtils.findMethod(jBossVersionClass, "getMajor"), versionObject);
            // For JBoss AS versions 5 and higher
            if (majorVersion >= 5) {
                return true;
            }
        } catch (ClassNotFoundException e) {
            // do nothing;
        }
        return false;
    }

    public static Class getVFSWebContextClass() {
        try {
            return ClassUtils.forName(VFS_APPLICATION_CONTEXT_CLASS_NAME);
        } catch (ClassNotFoundException ex) {
            throw new ApplicationContextException(
                    "Failed to load custom context class [" + VFS_APPLICATION_CONTEXT_CLASS_NAME + "]", ex);
        }
    }
}