001/*
002 * This library is part of OpenCms -
003 * the Open Source Content Management System
004 *
005 * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
006 *
007 * This library is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * This library is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015 * Lesser General Public License for more details.
016 *
017 * For further information about Alkacon Software, please see the
018 * company website: http://www.alkacon.com
019 *
020 * For further information about OpenCms, please see the
021 * project website: http://www.opencms.org
022 *
023 * You should have received a copy of the GNU Lesser General Public
024 * License along with this library; if not, write to the Free Software
025 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
026 */
027
028package org.opencms.ui.apps.util;
029
030import java.lang.reflect.InvocationTargetException;
031import java.lang.reflect.Method;
032import java.util.Map;
033
034import com.google.common.collect.Maps;
035import com.vaadin.ui.Component;
036
037public class CmsReflectionAppAttributeProvider {
038
039    public static Map<String, Object> getComponentAttributes(Component component) {
040
041        Class<?> cls = component.getClass();
042        Map<String, Object> result = Maps.newHashMap();
043        for (Method method : cls.getDeclaredMethods()) {
044            ProvidesAppAttribute annotation = method.getAnnotation(ProvidesAppAttribute.class);
045            if (annotation != null) {
046                Object val = null;
047                try {
048                    val = method.invoke(component);
049                    result.put(annotation.name(), val);
050                } catch (InvocationTargetException e) {
051                    Throwable cause = e.getCause();
052                    if (cause instanceof Exception) {
053                        throw new RuntimeException(cause);
054                    } else if (cause instanceof RuntimeException) {
055                        throw (RuntimeException)cause;
056                    } else if (cause instanceof Error) {
057                        throw (Error)cause;
058                    }
059                } catch (Exception e) {
060                    throw new RuntimeException(e);
061                }
062            }
063        }
064        return result;
065
066    }
067
068}