JResourceManagerWrapper.java

package org.objectweb.jonas.security.lib.wrapper;

import java.io.Reader;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.objectweb.jonas.security.JResources;
import org.objectweb.jonas.security.SecurityServiceException;
import org.objectweb.jonas.server.LoaderManager;

public class JResourceManagerWrapper {

    private static Object managerInstance = null;

    private static Method addResourcesMethod = null;

    private JResourceManagerWrapper() {
    }

    public static void addResources(JResources jres, Reader reader, String xml) throws SecurityServiceException {
        if (managerInstance == null) {
            managerInstance = getJResourceManagerInstance();
        }

        if (addResourcesMethod == null) {
            addResourcesMethod = getJResourceManagerMethod();
        }

        try {
            addResourcesMethod.invoke(managerInstance, new Object[] {jres, reader, xml});
        } catch (InvocationTargetException e) {
            Throwable t = e.getTargetException();
            if (t instanceof SecurityServiceException) {
                throw (SecurityServiceException) t;
            } else if (t instanceof Error) {
                throw (Error) t;
            }
            throw new SecurityServiceException("Exception during JResourcesManager.addResources invocation", e);
        } catch (Exception e) {
            throw new SecurityServiceException("Exception during JResourcesManager.addResources invocation", e);
        }
    }

    private static Method getJResourceManagerMethod() throws SecurityServiceException {
        try {
            return managerInstance.getClass().getMethod("addResources",
                    new Class[] {JResources.class, Reader.class, String.class});
        } catch (Exception e) {
            throw new SecurityServiceException("Cannot get JResourcesManager.addResources method", e);
        }
    }

    private static Object getJResourceManagerInstance() throws SecurityServiceException {

        LoaderManager lm = LoaderManager.getInstance();
        try {
            ClassLoader tools = lm.getToolsLoader();

            Class jrmClass = tools.loadClass("org.objectweb.jonas.security.lib.JResourceManager");
            Method m = jrmClass.getMethod("getInstance", new Class[] {});
            return m.invoke(null, new Object[] {});
        } catch (InvocationTargetException e) {
            Throwable t = e.getTargetException();
            if (t instanceof SecurityServiceException) {
                throw (SecurityServiceException) t;
            } else if (t instanceof Error) {
                throw (Error) t;
            }
            throw new SecurityServiceException("InvocationTargetException during JResourcesManager.getInstance invocation : " + e.getMessage(), e);
        } catch (Exception e) {
            throw new SecurityServiceException("Exception during JResourcesManager.getInstance invocation : " + e.getMessage(), e);
        }
    }

}

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