Examples of org.springframework.web.bind.WebDataBinder

org.springframework.web.bind.WebDataBinder
Special {@link DataBinder} for data binding from web request parametersto JavaBean objects. Designed for web environments, but not dependent on the Servlet API; serves as base class for more specific DataBinder variants, such as {@link org.springframework.web.bind.ServletRequestDataBinder}.
Includes support for field markers which address a common problem with HTML checkboxes and select options: detecting that a field was part of the form, but did not generate a request parameter because it was empty. A field marker allows to detect that state and reset the corresponding bean property accordingly. Default values, for parameters that are otherwise not present, can specify a value for the field other then empty. @author Juergen Hoeller @author Scott Andrews @since 1.2 @see #registerCustomEditor @see #setAllowedFields @see #setRequiredFields @see #setFieldMarkerPrefix @see #setFieldDefaultPrefix @see ServletRequestDataBinder

          }
          if (!attrName.startsWith(BindingResult.MODEL_KEY_PREFIX) &&
              (isSessionAttr || isBindingCandidate(attrValue))) {
            String bindingResultKey = BindingResult.MODEL_KEY_PREFIX + attrName;
            if (mavModel != null && !model.containsKey(bindingResultKey)) {
              WebDataBinder binder = createBinder(webRequest, attrValue, attrName);
              initBinder(handler, attrName, binder, webRequest);
              mavModel.put(bindingResultKey, binder.getBindingResult());
            }
          }
        }
      }
      catch (InvocationTargetException ex) {

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      }
      else if (pathVarName != null) {
        args[i] = resolvePathVariable(pathVarName, methodParam, webRequest, handler);
      }
      else if (attrName != null) {
        WebDataBinder binder =
            resolveModelAttribute(attrName, methodParam, implicitModel, webRequest, handler);
        boolean assignBindingResult = (args.length > i + 1 && Errors.class.isAssignableFrom(paramTypes[i + 1]));
        if (binder.getTarget() != null) {
          doBind(binder, webRequest, validate, validationHints, !assignBindingResult);
        }
        args[i] = binder.getTarget();
        if (assignBindingResult) {
          args[i + 1] = binder.getBindingResult();
          i++;
        }
        implicitModel.putAll(binder.getBindingResult().getModel());
      }
    }


    return args;
  }

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      else if (required) {
        raiseMissingParameterException(paramName, paramType);
      }
      paramValue = checkValue(paramName, paramValue, paramType);
    }
    WebDataBinder binder = createBinder(webRequest, null, paramName);
    initBinder(handlerForInitBinderCall, paramName, binder, webRequest);
    return binder.convertIfNecessary(paramValue, paramType, methodParam);
  }

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      else if (required) {
        raiseMissingHeaderException(headerName, paramType);
      }
      headerValue = checkValue(headerName, headerValue, paramType);
    }
    WebDataBinder binder = createBinder(webRequest, null, headerName);
    initBinder(handlerForInitBinderCall, headerName, binder, webRequest);
    return binder.convertIfNecessary(headerValue, paramType, methodParam);
  }

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      else if (required) {
        raiseMissingCookieException(cookieName, paramType);
      }
      cookieValue = checkValue(cookieName, cookieValue, paramType);
    }
    WebDataBinder binder = createBinder(webRequest, null, cookieName);
    initBinder(handlerForInitBinderCall, cookieName, binder, webRequest);
    return binder.convertIfNecessary(cookieValue, paramType, methodParam);
  }

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    Class<?> paramType = methodParam.getParameterType();
    if (pathVarName.length() == 0) {
      pathVarName = getRequiredParameterName(methodParam);
    }
    String pathVarValue = resolvePathVariable(pathVarName, paramType, webRequest);
    WebDataBinder binder = createBinder(webRequest, null, pathVarName);
    initBinder(handlerForInitBinderCall, pathVarName, binder, webRequest);
    return binder.convertIfNecessary(pathVarValue, paramType, methodParam);
  }

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      }
    }
    else {
      bindObject = BeanUtils.instantiateClass(paramType);
    }
    WebDataBinder binder = createBinder(webRequest, bindObject, name);
    initBinder(handler, name, binder, webRequest);
    return binder;
  }

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        arg = readWithMessageConverters(inputMessage, parameter, parameter.getParameterType());
        if (arg != null) {
          Annotation[] annotations = parameter.getParameterAnnotations();
          for (Annotation annot : annotations) {
            if (annot.annotationType().getSimpleName().startsWith("Valid")) {
              WebDataBinder binder = binderFactory.createBinder(request, arg, partName);
              Object hints = AnnotationUtils.getValue(annot);
              binder.validate(hints instanceof Object[] ? (Object[]) hints : new Object[] {hints});
              BindingResult bindingResult = binder.getBindingResult();
              if (bindingResult.hasErrors()) {
                throw new MethodArgumentNotValidException(parameter, bindingResult);
              }
            }
          }

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                    WebDataBinderFactory binderFactory) throws Exception {
    String name = ModelFactory.getNameForParameter(parameter);
    Object target = (mavContainer.containsAttribute(name)) ?
        mavContainer.getModel().get(name) : createAttribute(name, parameter, binderFactory, request);


    WebDataBinder binder = binderFactory.createBinder(request, target, name);
    if (binder.getTarget() != null) {
      bindRequestParameters(binder, request);
      validateIfApplicable(binder, parameter);
      if (binder.getBindingResult().hasErrors()) {
        if (isBindExceptionRequired(binder, parameter)) {
          throw new BindException(binder.getBindingResult());
        }
      }
    }


    mavContainer.addAllAttributes(binder.getBindingResult().getModel());
    return binder.getTarget();
  }

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      }
      arg = handleNullValue(namedValueInfo.name, arg, paramType);
    }


    if (binderFactory != null) {
      WebDataBinder binder = binderFactory.createBinder(webRequest, null, namedValueInfo.name);
      arg = binder.convertIfNecessary(arg, paramType, parameter);
    }
    
    handleResolvedValue(arg, namedValueInfo.name, parameter, mavContainer, webRequest);


    return arg;

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