001// Licensed under the Apache License, Version 2.0 (the "License");
002// you may not use this file except in compliance with the License.
003// You may obtain a copy of the License at
004//
005// http://www.apache.org/licenses/LICENSE-2.0
006//
007// Unless required by applicable law or agreed to in writing, software
008// distributed under the License is distributed on an "AS IS" BASIS,
009// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
010// See the License for the specific language governing permissions and
011// limitations under the License.
012
013package org.apache.tapestry5.corelib.components;
014
015import org.apache.tapestry5.BindingConstants;
016import org.apache.tapestry5.ComponentResources;
017import org.apache.tapestry5.SymbolConstants;
018import org.apache.tapestry5.alerts.AlertManager;
019import org.apache.tapestry5.annotations.Component;
020import org.apache.tapestry5.annotations.Environmental;
021import org.apache.tapestry5.annotations.Parameter;
022import org.apache.tapestry5.annotations.Property;
023import org.apache.tapestry5.internal.services.ReloadHelper;
024import org.apache.tapestry5.ioc.annotations.Inject;
025import org.apache.tapestry5.ioc.annotations.Symbol;
026import org.apache.tapestry5.services.Request;
027import org.apache.tapestry5.services.Session;
028import org.apache.tapestry5.services.javascript.JavaScriptSupport;
029
030/**
031 * Renders a dropdown menu of useful options when developing. By default, the DevTool is disabled (invisible)
032 * during production.
033 *
034 * The DevTool provides the following options:
035 * <ul>
036 * <li>Reset the page state, discarding any persistent page properties</li>
037 * <li>Kill the HttpSession (discarding any server-side state)</li>
038 * <li>Re-render the page (useful after changing the page or template)</li>
039 * <li>Re-render the page with rendering comments</li>
040 * <li>Reload all pages and components: classes, messages, templates</li>
041 * <li>Open the T5 Dashboard page in a new window</li>
042 * </ul>
043 *
044 * Note that due to conflicts between Prototype and jQuery, the dev tool is hidden after selecting an item from the menu.
045 *
046 * @tapestrydoc
047 * @since 5.4
048 */
049public class DevTool
050{
051    /**
052     * If false, then the component does not render. Defaults to true unless production mode is enabled.
053     */
054    @Parameter
055    private boolean enabled;
056
057    /**
058     * If true, then the DevTool modifies its markup so as to work within a Bootstrap 3 NavBar. This renders
059     * the component as a {@code <li>} (instead of a {@code <div>}), and removes the "btn" CSS classes.
060     */
061    @Parameter
062    private boolean navbar;
063
064    /**
065     * Additional CSS selectors, e.g., "pull-right" or "dropup".
066     */
067    @Parameter(name = "class", defaultPrefix = BindingConstants.LITERAL)
068    private String className;
069
070
071    @Property
072    @Inject
073    @Symbol(SymbolConstants.PRODUCTION_MODE)
074    private boolean productionMode;
075
076    @Component(inheritInformalParameters = true, parameters = {
077            "class=zoneClass",
078            "elementName=${zoneElement}"
079    })
080    private Zone devmodezone;
081
082
083    @Inject
084    private AlertManager alertManager;
085
086    @Inject
087    private Request request;
088
089    @Environmental
090    private JavaScriptSupport javaScriptSupport;
091
092    @Inject
093    private ComponentResources resources;
094
095    @Inject
096    private ReloadHelper reloadHelper;
097
098    public String getZoneElement()
099    {
100        return navbar ? "li" : "div";
101    }
102
103    public String getZoneClass()
104    {
105        return "dropdown" + (className == null ? "" : " " + className);
106    }
107
108    public String getTriggerClass()
109    {
110        return "dropdown-toggle" + (navbar ? "" : " btn btn-default btn-xs");
111    }
112
113    boolean defaultEnabled()
114    {
115        return !productionMode;
116    }
117
118    /**
119     * When disabled, this prevents any part of the tool from rendering.
120     */
121    boolean beginRender()
122    {
123        if (enabled)
124        {
125            javaScriptSupport.importStack("core").require("bootstrap/dropdown");
126        }
127
128        return enabled;
129    }
130
131    Object onActionFromReset()
132    {
133        if (!productionMode)
134        {
135            resources.discardPersistentFieldChanges();
136
137            alertManager.info("Page state discarded.");
138        }
139
140        return devmodezone.getBody();
141    }
142
143    Object onActionFromKill()
144    {
145        if (!productionMode)
146        {
147            Session session = request.getSession(false);
148
149            if (session == null)
150            {
151                alertManager.info("No server-side session currently exist.");
152            } else
153            {
154                session.invalidate();
155                alertManager.info("Server-side session invalidated.");
156            }
157        }
158
159        return devmodezone.getBody();
160    }
161
162    Object onActionFromReload()
163    {
164        reloadHelper.forceReload();
165
166        return devmodezone.getBody();
167    }
168}