src/java/de/uapcore/lightpit/AbstractLightPITServlet.java

Sat, 07 Apr 2018 23:01:58 +0200

author
Mike Becker <universe@uap-core.de>
date
Sat, 07 Apr 2018 23:01:58 +0200
changeset 23
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parent 22
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child 24
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permissions
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global table style

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2017 Mike Becker. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 *
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28 */
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29 package de.uapcore.lightpit;
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30
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31 import java.io.IOException;
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32 import java.lang.reflect.Method;
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33 import java.lang.reflect.Modifier;
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34 import java.util.Arrays;
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35 import java.util.HashMap;
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36 import java.util.List;
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37 import java.util.Locale;
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38 import java.util.Map;
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39 import java.util.Optional;
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40 import javax.servlet.ServletException;
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41 import javax.servlet.http.HttpServlet;
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42 import javax.servlet.http.HttpServletRequest;
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43 import javax.servlet.http.HttpServletResponse;
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44 import javax.servlet.http.HttpSession;
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45 import org.slf4j.Logger;
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46 import org.slf4j.LoggerFactory;
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47
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48 /**
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49 * A special implementation of a HTTPServlet which is focused on implementing
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50 * the necessary functionality for {@link LightPITModule}s.
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51 */
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52 public abstract class AbstractLightPITServlet extends HttpServlet {
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53
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54 private static final Logger LOG = LoggerFactory.getLogger(AbstractLightPITServlet.class);
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55
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56 private static final String HTML_FULL_DISPATCHER = Functions.jspPath("html_full");
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57
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58 /**
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59 * Store a reference to the annotation for quicker access.
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60 */
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61 private Optional<LightPITModule> moduleInfo = Optional.empty();
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62
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63 /**
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64 * The EL proxy is necessary, because the EL resolver cannot handle annotation properties.
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65 */
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66 private Optional<LightPITModule.ELProxy> moduleInfoELProxy = Optional.empty();
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67
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68
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69 @FunctionalInterface
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70 private static interface HandlerMethod {
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71 ResponseType apply(HttpServletRequest t, HttpServletResponse u) throws IOException, ServletException;
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72 }
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73
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74 /**
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75 * Invocation mapping gathered from the {@link RequestMapping} annotations.
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76 *
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77 * Paths in this map must always start with a leading slash, although
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78 * the specification in the annotation must not start with a leading slash.
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79 *
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80 * The reason for this is the different handling of empty paths in
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81 * {@link HttpServletRequest#getPathInfo()}.
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82 */
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83 private final Map<HttpMethod, Map<String, HandlerMethod>> mappings = new HashMap<>();
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84
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85 /**
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86 * Gives implementing modules access to the {@link ModuleManager}.
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87 * @return the module manager
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88 */
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89 protected final ModuleManager getModuleManager() {
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90 return (ModuleManager) getServletContext().getAttribute(ModuleManager.SC_ATTR_NAME);
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91 }
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92
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93 /**
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94 * Gives implementing modules access to the {@link DatabaseFacade}.
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95 * @return the database facade
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96 */
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97 protected final DatabaseFacade getDatabaseFacade() {
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98 return (DatabaseFacade) getServletContext().getAttribute(DatabaseFacade.SC_ATTR_NAME);
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99 }
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100
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101 private ResponseType invokeMapping(Method method, HttpServletRequest req, HttpServletResponse resp)
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102 throws IOException, ServletException {
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103 try {
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104 LOG.trace("invoke {}#{}", method.getDeclaringClass().getName(), method.getName());
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105 return (ResponseType) method.invoke(this, req, resp);
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106 } catch (ReflectiveOperationException | ClassCastException ex) {
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107 LOG.error(String.format("invocation of method %s failed", method.getName()), ex);
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108 resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
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109 return ResponseType.NONE;
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110 }
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111 }
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112
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113 @Override
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114 public void init() throws ServletException {
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115 moduleInfo = Optional.ofNullable(this.getClass().getAnnotation(LightPITModule.class));
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116 moduleInfoELProxy = moduleInfo.map(LightPITModule.ELProxy::convert);
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117
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118 if (moduleInfo.isPresent()) {
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119 scanForRequestMappings();
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120 }
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121
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122 LOG.trace("{} initialized", getServletName());
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123 }
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124
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125 private void scanForRequestMappings() {
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126 try {
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127 Method[] methods = getClass().getDeclaredMethods();
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128 for (Method method : methods) {
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129 Optional<RequestMapping> mapping = Optional.ofNullable(method.getAnnotation(RequestMapping.class));
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130 if (mapping.isPresent()) {
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131 if (!Modifier.isPublic(method.getModifiers())) {
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132 LOG.warn("{} is annotated with {} but is not public",
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133 method.getName(), RequestMapping.class.getSimpleName()
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134 );
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135 continue;
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136 }
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137 if (Modifier.isAbstract(method.getModifiers())) {
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138 LOG.warn("{} is annotated with {} but is abstract",
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139 method.getName(), RequestMapping.class.getSimpleName()
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140 );
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141 continue;
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142 }
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143 if (!ResponseType.class.isAssignableFrom(method.getReturnType())) {
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144 LOG.warn("{} is annotated with {} but has the wrong return type - 'ResponseType' required",
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145 method.getName(), RequestMapping.class.getSimpleName()
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146 );
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147 continue;
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148 }
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149
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150 Class<?>[] params = method.getParameterTypes();
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151 if (params.length == 2
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152 && HttpServletRequest.class.isAssignableFrom(params[0])
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153 && HttpServletResponse.class.isAssignableFrom(params[1])) {
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154
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155 final String requestPath = "/"+mapping.get().requestPath();
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156
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157 if (mappings.computeIfAbsent(mapping.get().method(), k -> new HashMap<>()).
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158 putIfAbsent(requestPath,
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159 (req, resp) -> invokeMapping(method, req, resp)) != null) {
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160 LOG.warn("{} {} has multiple mappings",
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161 mapping.get().method(),
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162 mapping.get().requestPath()
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163 );
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164 }
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165
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166 LOG.debug("{} {} maps to {}::{}",
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167 mapping.get().method(),
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168 requestPath,
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169 getClass().getSimpleName(),
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170 method.getName()
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171 );
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172 } else {
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173 LOG.warn("{} is annotated with {} but has the wrong parameters - (HttpServletRequest,HttpServletResponse) required",
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174 method.getName(), RequestMapping.class.getSimpleName()
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175 );
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176 }
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177 }
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178 }
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179 } catch (SecurityException ex) {
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180 LOG.error("Scan for request mappings on declared methods failed.", ex);
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181 }
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182 }
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183
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184 @Override
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185 public void destroy() {
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186 mappings.clear();
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187 LOG.trace("{} destroyed", getServletName());
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188 }
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189
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190 /**
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191 * Sets the name of the dynamic fragment.
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192 *
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193 * It is sufficient to specify the name without any extension. The extension
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194 * is added automatically if not specified.
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195 *
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196 * The fragment must be located in the dynamic fragments folder.
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197 *
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198 * @param req the servlet request object
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199 * @param fragmentName the name of the fragment
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200 * @see Constants#DYN_FRAGMENT_PATH_PREFIX
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201 */
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202 public void setDynamicFragment(HttpServletRequest req, String fragmentName) {
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203 req.setAttribute(Constants.REQ_ATTR_FRAGMENT, Functions.dynFragmentPath(fragmentName));
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204 }
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205
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206 /**
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207 * Specifies the name of an additional stylesheet used by the module.
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208 *
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209 * Setting an additional stylesheet is optional, but quite common for HTML
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210 * output.
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211 *
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212 * It is sufficient to specify the name without any extension. The extension
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213 * is added automatically if not specified.
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214 *
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215 * @param req the servlet request object
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216 * @param stylesheet the name of the stylesheet
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217 */
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218 public void setStylesheet(HttpServletRequest req, String stylesheet) {
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219 req.setAttribute(Constants.REQ_ATTR_STYLESHEET, Functions.enforceExt(stylesheet, ".css"));
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220 }
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221
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222 private void forwardToFullView(HttpServletRequest req, HttpServletResponse resp)
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223 throws IOException, ServletException {
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224
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225 req.setAttribute(Constants.REQ_ATTR_MENU, getModuleManager().getMainMenu());
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226 req.getRequestDispatcher(HTML_FULL_DISPATCHER).forward(req, resp);
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227 }
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228
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229 private Optional<HandlerMethod> findMapping(HttpMethod method, HttpServletRequest req) {
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230 return Optional.ofNullable(mappings.get(method)).map(
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231 (rm) -> rm.get(Optional.ofNullable(req.getPathInfo()).orElse("/"))
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232 );
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233 }
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234
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235 private void forwardAsSepcified(ResponseType type, HttpServletRequest req, HttpServletResponse resp)
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236 throws ServletException, IOException {
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237 switch (type) {
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238 case NONE: return;
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239 case HTML_FULL:
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240 forwardToFullView(req, resp);
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241 return;
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242 // TODO: implement remaining response types
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243 default:
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244 // this code should be unreachable
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245 LOG.error("ResponseType switch is not exhaustive - this is a bug!");
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246 throw new UnsupportedOperationException();
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247 }
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248 }
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249
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250 private void doProcess(HttpMethod method, HttpServletRequest req, HttpServletResponse resp)
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251 throws ServletException, IOException {
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252
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253 // Synchronize module information with database
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254 getModuleManager().syncWithDatabase(getDatabaseFacade());
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255
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256 // choose the requested language as session language (if available) or fall back to english, otherwise
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257 HttpSession session = req.getSession();
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258 if (session.getAttribute(Constants.SESSION_ATTR_LANGUAGE) == null) {
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259 Optional<List<String>> availableLanguages = Functions.availableLanguages(getServletContext()).map(Arrays::asList);
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260 Optional<Locale> reqLocale = Optional.of(req.getLocale());
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261 Locale sessionLocale = reqLocale.filter((rl) -> availableLanguages.map((al) -> al.contains(rl.getLanguage())).orElse(false)).orElse(Locale.ENGLISH);
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262 session.setAttribute(Constants.SESSION_ATTR_LANGUAGE, sessionLocale);
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263 LOG.debug("Settng language for new session {}: {}", session.getId(), sessionLocale.getDisplayLanguage());
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264 } else {
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265 Locale sessionLocale = (Locale) session.getAttribute(Constants.SESSION_ATTR_LANGUAGE);
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266 resp.setLocale(sessionLocale);
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267 LOG.trace("Continuing session {} with language {}", session.getId(), sessionLocale);
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268 }
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269
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270 // set some internal request attributes
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271 req.setAttribute(Constants.REQ_ATTR_PATH, Functions.fullPath(req));
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272 req.setAttribute(Constants.REQ_ATTR_MODULE_CLASSNAME, this.getClass().getName());
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273 moduleInfoELProxy.ifPresent((proxy) -> req.setAttribute(Constants.REQ_ATTR_MODULE_INFO, proxy));
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274
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275
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276 // call the handler, if available, or send an HTTP 404 error
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277 Optional<HandlerMethod> mapping = findMapping(method, req);
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278 if (mapping.isPresent()) {
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279 forwardAsSepcified(mapping.get().apply(req, resp), req, resp);
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280 } else {
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281 resp.sendError(HttpServletResponse.SC_NOT_FOUND);
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282 }
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283 }
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284
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285 @Override
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286 protected final void doGet(HttpServletRequest req, HttpServletResponse resp)
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287 throws ServletException, IOException {
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288 doProcess(HttpMethod.GET, req, resp);
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289 }
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290
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291 @Override
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292 protected final void doPost(HttpServletRequest req, HttpServletResponse resp)
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293 throws ServletException, IOException {
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294 doProcess(HttpMethod.POST, req, resp);
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295 }
598670d5b0b8 core functionality should also use the modules system, changed the code structure accordingly
Mike Becker <universe@uap-core.de>
parents:
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296 }

mercurial