1 | package com.ether; |
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2 | |
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3 | import java.io.UnsupportedEncodingException; |
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4 | import java.lang.annotation.Annotation; |
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5 | import java.lang.reflect.Method; |
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6 | import java.security.InvalidParameterException; |
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7 | import java.util.ArrayList; |
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8 | import java.util.Collection; |
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9 | import java.util.Date; |
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10 | import java.util.HashMap; |
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11 | import java.util.List; |
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12 | import java.util.Map; |
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13 | |
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14 | import javax.servlet.http.HttpServletRequest; |
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15 | import javax.servlet.http.HttpServletResponse; |
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16 | |
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17 | import net.sf.json.JSON; |
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18 | import net.sf.json.JSONArray; |
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19 | import net.sf.json.JSONNull; |
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20 | import net.sf.json.JSONObject; |
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21 | import net.sf.json.util.JSONUtils; |
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22 | |
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23 | import org.apache.commons.logging.Log; |
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24 | import org.apache.commons.logging.LogFactory; |
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25 | import org.jetbrains.annotations.NotNull; |
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26 | import org.jetbrains.annotations.Nullable; |
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27 | import org.springframework.beans.factory.annotation.Required; |
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28 | import org.springframework.web.servlet.ModelAndView; |
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29 | import org.springframework.web.servlet.mvc.AbstractController; |
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30 | import org.springframework.web.servlet.mvc.multiaction.MethodNameResolver; |
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31 | import org.springframework.web.servlet.mvc.multiaction.NoSuchRequestHandlingMethodException; |
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32 | |
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33 | import com.ether.annotation.ControllerMethod; |
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34 | import com.ether.annotation.Mandatory; |
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35 | import com.ether.annotation.ParamName; |
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36 | import com.ether.annotation.UseJSON; |
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37 | |
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38 | public class ControllerEther extends AbstractController |
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39 | { |
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40 | @Override |
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41 | @Nullable |
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42 | protected ModelAndView handleRequestInternal(@NotNull final HttpServletRequest request, @NotNull final HttpServletResponse response) |
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43 | throws WebException, EtherException |
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44 | { |
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45 | try { |
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46 | if (!_initialized) |
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47 | initialize(); |
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48 | |
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49 | |
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50 | request.setCharacterEncoding(UTF8Charset.getEncoding()); |
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51 | |
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52 | final String methodName = _methodNameResolver.getHandlerMethodName(request); |
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53 | |
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54 | final MethodDescription methodDescription = _methods.get(methodName); |
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55 | if (null == methodDescription) { |
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56 | WebHelper.displayError( response, methodName ); |
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57 | return null; |
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58 | } |
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59 | |
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60 | return invokeMethod(methodDescription, request, response); |
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61 | } catch (UnsupportedEncodingException e) { |
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62 | throw new WebException(WebException.WebCode.ERROR_UNSUPPORTED_UTF8_ENCODING, e); |
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63 | } catch (NoSuchRequestHandlingMethodException e) { |
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64 | throw new WebException(WebException.WebCode.ERROR_NO_REQUEST_HANDLING_METHOD, e); |
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65 | } |
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66 | } |
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67 | |
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68 | @Nullable |
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69 | private ModelAndView invokeMethod( @NotNull final MethodDescription methodDescription, @NotNull final HttpServletRequest request, @NotNull final HttpServletResponse response) |
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70 | throws WebException |
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71 | { |
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72 | try { |
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73 | // Parse parameters |
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74 | final Object[] params = buildParams(methodDescription, request); |
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75 | |
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76 | // Invoke method (go to controller) |
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77 | final Object result = methodDescription.getMethod().invoke(this, params); |
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78 | |
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79 | if (!methodDescription.getView().isEmpty()) { |
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80 | response.setStatus(HttpServletResponse.SC_OK); |
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81 | if (result instanceof Map) |
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82 | return new ModelAndView(methodDescription.getView(), (Map) result); |
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83 | else |
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84 | return new ModelAndView(methodDescription.getView(), "result", result); |
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85 | |
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86 | } else if (methodDescription.isJsonResult()) { |
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87 | response.setStatus(HttpServletResponse.SC_OK); |
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88 | final String jsonResult = convertToJson(result); |
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89 | WebHelper.writeJsonToResponse(response, jsonResult); |
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90 | return null; |
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91 | } else { |
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92 | response.setStatus(HttpServletResponse.SC_NO_CONTENT); |
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93 | return null; |
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94 | } |
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95 | } catch (Throwable e) { |
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96 | throw new WebException(e); |
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97 | } |
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98 | } |
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99 | |
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100 | @NotNull |
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101 | private String convertToJson( @Nullable final Object object ) |
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102 | { |
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103 | if( null == object) |
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104 | return JSONNull.getInstance().toString(); |
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105 | if( object instanceof JSON ) |
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106 | return object.toString(); |
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107 | if( object instanceof Collection ) |
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108 | return _jsonHelper.toJSON( (Collection) object ).toString(); |
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109 | if( object.getClass().isArray() ) |
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110 | return _jsonHelper.toJSON( object ).toString(); |
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111 | if( object instanceof Number || object instanceof Boolean || object instanceof String ) |
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112 | return JSONUtils.valueToString( object ); |
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113 | return _jsonHelper.toJSON( object ).toString(); |
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114 | } |
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115 | |
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116 | @NotNull |
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117 | private Object[] buildParams(@NotNull final MethodDescription methodDescription, @NotNull final HttpServletRequest request) |
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118 | throws InvalidParameterException |
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119 | { |
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120 | final List<Object> params = new ArrayList<Object>(); |
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121 | for (final ParamDescription paramDescription : methodDescription.getParams()) { |
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122 | if (null == paramDescription) { |
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123 | params.add(null); |
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124 | continue; |
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125 | } |
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126 | final boolean canBeNull = !paramDescription.isPrimitive() && !paramDescription.isMandatory(); |
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127 | final String paramValue = WebHelper.getRequestParameter(request, paramDescription.getName(), null, canBeNull); |
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128 | final boolean useJSON = paramDescription.isUsingJSON(); |
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129 | params.add(convertParameter(paramDescription.getType(), paramValue, useJSON)); |
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130 | } |
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131 | return params.toArray(new Object[params.size()]); |
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132 | } |
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133 | |
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134 | @Nullable |
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135 | private Object convertParameter( @NotNull final Class paramType, @Nullable final String paramValue, final boolean useJSON ) |
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136 | { |
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137 | if( null == paramValue ) |
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138 | return null; |
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139 | if( useJSON ) |
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140 | return _jsonHelper.fromJSON( _jsonHelper.toJSON( paramValue ), paramType ); |
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141 | if( JSONObject.class.equals( paramType ) ) |
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142 | return _jsonHelper.toJSON( paramValue ); |
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143 | if( JSONArray.class.equals( paramType ) ) |
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144 | return _jsonHelper.toJSON( paramValue ); |
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145 | if( String.class .equals( paramType ) ) |
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146 | return paramValue; |
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147 | if( Boolean.TYPE.equals( paramType ) || Boolean.class.equals( paramType ) ) |
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148 | return Boolean.valueOf( paramValue ); |
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149 | if( Integer.TYPE.equals( paramType ) || Integer.class.equals( paramType ) ) |
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150 | return Integer.valueOf( paramValue ); |
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151 | if( Long.TYPE.equals( paramType ) || Long.class.equals( paramType ) ) |
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152 | return Long.valueOf( paramValue ); |
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153 | if( Float.TYPE.equals( paramType ) || Float.class.equals( paramType ) ) |
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154 | return Float.valueOf( paramValue ); |
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155 | if( Double.TYPE.equals( paramType ) || Double.class.equals( paramType ) ) |
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156 | return Double.valueOf( paramValue ); |
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157 | if( Date.class.isAssignableFrom( paramType ) ) |
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158 | return new Date( Long.valueOf( paramValue ) ); |
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159 | if( paramType.isEnum() ) |
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160 | return Enum.valueOf( paramType, paramValue ); |
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161 | if( Map.class.isAssignableFrom( paramType ) ) |
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162 | return JSONObject.fromObject( paramValue ); |
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163 | |
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164 | throw new UnsupportedOperationException( "Unsupported: cast parameter to " + paramType.getName() ); |
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165 | } |
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166 | |
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167 | private void initialize() |
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168 | throws WebException |
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169 | { |
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170 | for( final Method method : getClass().getMethods() ) |
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171 | { |
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172 | final ControllerMethod annotation = method.getAnnotation( ControllerMethod.class ); |
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173 | if( null != annotation ) |
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174 | { |
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175 | final MethodDescription methodDescription = new MethodDescription( method, annotation ); |
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176 | fillMethodDescription( method, methodDescription ); |
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177 | _methods.put( method.getName(), methodDescription ); |
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178 | } |
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179 | } |
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180 | |
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181 | _initialized = true; |
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182 | } |
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183 | |
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184 | private void fillMethodDescription( @NotNull final Method method, @NotNull final MethodDescription methodDescription ) |
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185 | throws WebException |
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186 | { |
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187 | final Class<?>[] paramTypes = method.getParameterTypes(); |
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188 | final Annotation[][] paramAnnotations = method.getParameterAnnotations(); |
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189 | |
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190 | if(paramTypes.length != paramAnnotations.length) |
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191 | throw new WebException(WebException.WebCode.ERROR_NUMBER_OF_PARAM_TYPES_NOT_EQUAL_TO_PARAM_ANNOTATIONS, paramTypes.length+" "+paramAnnotations.length); |
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192 | |
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193 | for( int i = 0; i < paramTypes.length; ++i ) |
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194 | { |
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195 | ParamName paramNameAnnotation = null; |
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196 | Mandatory mandatoryAnnotation = null; |
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197 | UseJSON useJSONAnnotation = null; |
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198 | for( final Annotation paramAnnotation : paramAnnotations[i] ) |
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199 | { |
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200 | if( paramAnnotation instanceof ParamName ) |
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201 | paramNameAnnotation = (ParamName) paramAnnotation; |
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202 | if( paramAnnotation instanceof Mandatory ) |
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203 | mandatoryAnnotation = (Mandatory) paramAnnotation; |
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204 | if( paramAnnotation instanceof UseJSON ) |
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205 | useJSONAnnotation = (UseJSON) paramAnnotation; |
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206 | } |
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207 | if( null == paramNameAnnotation ) |
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208 | methodDescription.addNullParam(); |
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209 | else |
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210 | { |
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211 | final boolean mandatory = ( null != mandatoryAnnotation ); |
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212 | final boolean useJSON = ( null != useJSONAnnotation ); |
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213 | methodDescription.addParam( paramNameAnnotation.value(), paramTypes[i], mandatory, useJSON ); |
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214 | } |
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215 | } |
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216 | } |
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217 | |
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218 | @Required |
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219 | public void setMethodNameResolver( final MethodNameResolver methodNameResolver ) |
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220 | { |
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221 | _methodNameResolver = methodNameResolver; |
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222 | } |
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223 | |
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224 | protected JSONHelper getJsonHelper() |
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225 | { |
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226 | return _jsonHelper; |
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227 | } |
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228 | |
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229 | @Required |
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230 | public void setJsonHelper( final JSONHelper jsonHelper ) |
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231 | { |
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232 | _jsonHelper = jsonHelper; |
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233 | } |
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234 | |
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235 | protected Map<String, MethodDescription> getMethods() |
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236 | { |
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237 | return _methods; |
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238 | } |
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239 | |
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240 | private static final Log LOGGER = LogFactory.getLog( ControllerEther.class ); |
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241 | |
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242 | private JSONHelper _jsonHelper; |
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243 | private MethodNameResolver _methodNameResolver; |
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244 | private Map<String, MethodDescription> _methods = new HashMap<String, MethodDescription>(); |
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245 | private boolean _initialized; /*=false*/ |
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246 | } |
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