screens.java

sun公司的petstore,一个J2ee的示例应用程序.

/*
 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistribution 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.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES
 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN
 * OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR
 * FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR
 * PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF
 * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE SOFTWARE,
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that Software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of
 * any nuclear facility.
 */

package com.sun.j2ee.blueprints.waf.view.template;

import java.util.HashMap;

public class Screens implements java.io.Serializable {

    private HashMap screenMap;
    private HashMap templateMap;
    private String defaultTemplate;

    public Screens (String defaultTemplate) {
        screenMap = new HashMap();
        templateMap = new HashMap();
        this.defaultTemplate = defaultTemplate;
    }

    public String getDefaultTemplate() {
        return defaultTemplate;
    }

    public void addScreen(String screenName, Screen screen) {
        if (screenMap.containsKey(screenName)) {
            screenMap.remove(screenName);
        }
        screenMap.put(screenName, screen);
    }

    public void addTemplate(String templateName, String templateURL) {
        if (templateMap.containsKey(templateName)) {
            templateMap.remove(templateName);
        }
        templateMap.put(templateName, templateURL);
    }

    public Screen getScreen(String screenName) {

        if (screenMap.containsKey(screenName)) {
            return (Screen)screenMap.get(screenName);
        } else {
            System.err.println("Screens Error: Screen " + screenName + " not defined.");
           return null;
        }
    }

    public boolean containsScreen(String screenName) {
        return screenMap.containsKey(screenName);
    }

    public boolean containsTemplate(String templateName) {
        return templateMap.containsKey(templateName);
    }

    public String getTemplate(String screenName) {
        if (screenMap.containsKey(screenName)) {
            String templateName = ((Screen)screenMap.get(screenName)).getTemplate();
            if ((templateName != null) && templateMap.containsKey(templateName)) {
                    return (String)templateMap.get(templateName);
            } else {
                // return the default if template not defined for screen
                return defaultTemplate;
            }
        } else {
                System.err.println("Screens:getTemplate() error: Screen " + screenName + " not defined.");
                return null;
        }
    }

    public String toString() {
        return "[Screens: defaultTemplate=" + defaultTemplate + ", " +
                    "screenMap=" + screenMap +
                    "templateMap=" + templateMap + "]";
    }
}