| Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
| ContainerUtils |
|
| 4.0;4 |
| 1 | /* | |
| 2 | * Licensed to the Apache Software Foundation (ASF) under one | |
| 3 | * or more contributor license agreements. See the NOTICE file | |
| 4 | * distributed with this work for additional information | |
| 5 | * regarding copyright ownership. The ASF licenses this file | |
| 6 | * to you under the Apache License, Version 2.0 (the | |
| 7 | * "License"); you may not use this file except in compliance | |
| 8 | * with the License. You may obtain a copy of the License at | |
| 9 | * | |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 | |
| 11 | * | |
| 12 | * Unless required by applicable law or agreed to in writing, | |
| 13 | * software distributed under the License is distributed on an | |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
| 15 | * KIND, either express or implied. See the License for the | |
| 16 | * specific language governing permissions and limitations | |
| 17 | * under the License. | |
| 18 | */ | |
| 19 | package org.apache.myfaces.util; | |
| 20 | ||
| 21 | import javax.faces.context.ExternalContext; | |
| 22 | import javax.servlet.ServletContext; | |
| 23 | ||
| 24 | import org.apache.myfaces.shared.util.ExternalContextUtils; | |
| 25 | ||
| 26 | /** | |
| 27 | * Utilities for determining the current container and for the unified | |
| 28 | * expression language. | |
| 29 | * | |
| 30 | */ | |
| 31 | 0 | public class ContainerUtils |
| 32 | { | |
| 33 | /** | |
| 34 | * Used for determining whether Myfaces is running on Google App Engine. | |
| 35 | */ | |
| 36 | private static final String GAE_SERVER_INFO_BEGINNING = "Google App Engine"; | |
| 37 | ||
| 38 | /** | |
| 39 | * Determines whether we're running in a Servlet 2.5/JSP 2.1 environment. | |
| 40 | * | |
| 41 | * @return <code>true</code> if we're running in a JSP 2.1 environment, | |
| 42 | * <code>false</code> otherwise | |
| 43 | */ | |
| 44 | public static boolean isJsp21(ServletContext context) | |
| 45 | { | |
| 46 | //if running on GAE, treat like it is JSP 2.0 | |
| 47 | 0 | if(isRunningOnGoogleAppEngine(context)) |
| 48 | { | |
| 49 | 0 | return false; |
| 50 | } | |
| 51 | ||
| 52 | try | |
| 53 | { | |
| 54 | // simply check if the class JspApplicationContext is available | |
| 55 | 0 | Class.forName("javax.servlet.jsp.JspApplicationContext"); |
| 56 | 0 | return true; |
| 57 | } | |
| 58 | 0 | catch (ClassNotFoundException ex) |
| 59 | { | |
| 60 | // expected exception in a JSP 2.0 (or less) environment | |
| 61 | } | |
| 62 | ||
| 63 | 0 | return false; |
| 64 | } | |
| 65 | ||
| 66 | /** | |
| 67 | * Return true if the specified string contains an EL expression. | |
| 68 | * | |
| 69 | * <p> | |
| 70 | * <strong>NOTICE</strong> This method is just a copy of | |
| 71 | * {@link javax.faces.webapp.UIComponentTag#isValueReference(String)}, but it's required | |
| 72 | * because the class UIComponentTag depends on a JSP 2.1 container | |
| 73 | * (for example, it indirectly implements the interface JspIdConsumer) | |
| 74 | * and therefore internal classes shouldn't access this class. That's | |
| 75 | * also the reason why this method is inside the class ContainerUtils, | |
| 76 | * because it allows MyFaces to be independent of a JSP 2.1 container. | |
| 77 | * </p> | |
| 78 | */ | |
| 79 | public static boolean isValueReference(String value) | |
| 80 | { | |
| 81 | 0 | if (value == null) |
| 82 | { | |
| 83 | 0 | throw new NullPointerException("value"); |
| 84 | } | |
| 85 | ||
| 86 | 0 | int start = value.indexOf("#{"); |
| 87 | 0 | if (start < 0) |
| 88 | { | |
| 89 | 0 | return false; |
| 90 | } | |
| 91 | ||
| 92 | 0 | int end = value.lastIndexOf('}'); |
| 93 | 0 | return (end >=0 && start < end); |
| 94 | } | |
| 95 | ||
| 96 | 0 | private static Boolean runningOnGoogleAppEngine = null; |
| 97 | ||
| 98 | /**Returns true if running on Google App Engine (both production and development environment). | |
| 99 | * <p>If this method returns true, then | |
| 100 | * <ul> | |
| 101 | * <li>MyFaces is initialized as in JSP 2.0 or less environment.</li> | |
| 102 | * <li>Last modification check of faces config is not done during update.</li> | |
| 103 | * </ul> | |
| 104 | */ | |
| 105 | public static boolean isRunningOnGoogleAppEngine( | |
| 106 | ServletContext servletContext) | |
| 107 | { | |
| 108 | 0 | if (runningOnGoogleAppEngine != null) |
| 109 | { | |
| 110 | 0 | return runningOnGoogleAppEngine.booleanValue(); |
| 111 | } | |
| 112 | else | |
| 113 | { | |
| 114 | 0 | return isServerGoogleAppEngine(servletContext.getServerInfo()); |
| 115 | } | |
| 116 | } | |
| 117 | ||
| 118 | /** | |
| 119 | * @see ContainerUtils#isRunningOnGoogleAppEngine(ServletContext) | |
| 120 | */ | |
| 121 | public static boolean isRunningOnGoogleAppEngine( | |
| 122 | ExternalContext externalContext) | |
| 123 | { | |
| 124 | ||
| 125 | 0 | if (runningOnGoogleAppEngine != null) |
| 126 | { | |
| 127 | 0 | return runningOnGoogleAppEngine.booleanValue(); |
| 128 | } | |
| 129 | else | |
| 130 | { | |
| 131 | 0 | String serverInfo = ExternalContextUtils.getServerInfo(externalContext); |
| 132 | ||
| 133 | 0 | return isServerGoogleAppEngine(serverInfo); |
| 134 | } | |
| 135 | } | |
| 136 | ||
| 137 | private static boolean isServerGoogleAppEngine(String serverInfo) | |
| 138 | { | |
| 139 | //for GAE, server info can be "Google App Engine/x.x.x" or "Google App Engine Development/x.x.x" | |
| 140 | 0 | if (serverInfo != null && serverInfo.startsWith(GAE_SERVER_INFO_BEGINNING)) |
| 141 | { | |
| 142 | 0 | runningOnGoogleAppEngine = Boolean.TRUE; |
| 143 | } | |
| 144 | else | |
| 145 | { | |
| 146 | 0 | runningOnGoogleAppEngine = Boolean.FALSE; |
| 147 | } | |
| 148 | ||
| 149 | 0 | return runningOnGoogleAppEngine; |
| 150 | } | |
| 151 | } |