src/java/de/uapcore/lightpit/LightPITModule.java

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 2017 Mike Becker. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 */
package de.uapcore.lightpit;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import javax.servlet.annotation.WebServlet;


/**
 * Contains information about a LightPIT module.
 * 
 * This annotation is typically used to annotate the {@link WebServlet} which
 * implements the module's functionality.
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface LightPITModule {
    /**
     * Base name of the module specific resource bundle.
     * @return a base name suitable for the JSTL tag 'setBundle'.
     */
    String bundleBaseName();
    
    /**
     * An array of required modules, identified by the string representation of
     * their class names.
     * @return an array of class names of required modules
     */
    String[] requires() default {};
    
    /**
     * The path for this module, which will be used for the menu entry.
     * 
     * This path must adhere to the URL pattern of the Servlet but must not
     * contain any starting or trailing slashes.
     * 
     * @return the relative module path
     */
    String modulePath();
    
    /**
     * Returns the properties key for the menu label.
     * 
     * Set this string to empty string, if the module should be hidden from
     * the menu.
     * 
     * @return the properties key
     */
    String menuKey() default "menuLabel";
    
    /**
     * Returns the properties key for the page title.
     * 
     * By default this is the same as the menu label.
     * 
     * @return the properties key
     */
    String titleKey() default "menuLabel";
    
    /**
     * If set to <code>true</code>, this module is always loaded, but never
     * visible in the menu or the Web UI module manager.
     * 
     * @return true, if this is a system module
     */
    boolean systemModule() default false;
    
    /**
     * Class representing the annotation.
     * This is necessary, because the EL resolver cannot deal with
     * annotation objects.
     * 
     * Note, that only the properties which are interesting for the JSP pages
     * are proxied by this object.
     */
    public static class ELProxy {
        private final String bundleBaseName, modulePath, menuKey, titleKey;
        
        public static ELProxy convert(LightPITModule annotation) {
            return new ELProxy(
                    annotation.bundleBaseName(),
                    annotation.modulePath(),
                    annotation.menuKey(),
                    annotation.titleKey()
            );
        }

        private ELProxy(String bundleBaseName, String modulePath, String menuKey, String titleKey) {
            this.bundleBaseName = bundleBaseName;
            this.modulePath = modulePath;
            this.menuKey = menuKey;
            this.titleKey = titleKey;
        }

        public String getBundleBaseName() {
            return bundleBaseName;
        }

        public String getMenuKey() {
            return menuKey;
        }

        public String getModulePath() {
            return modulePath;
        }

        public String getTitleKey() {
            return titleKey;
        }
    }
}