Example usage for com.fasterxml.jackson.databind.type MapType narrowKey

Introduction

In this page you can find the example usage for com.fasterxml.jackson.databind.type MapType narrowKey.

Prototype

public JavaType narrowKey(Class<?> paramClass) 

Source Link

Usage

From source file:com.xiongyingqi.spring.mvc.method.annotation.RequestJsonParamMethodArgumentResolver.java

@Override
protected Object resolveName(String name, MethodParameter parameter, NativeWebRequest webRequest)
        throws Exception {
    String[] paramValues = webRequest.getParameterValues(name);

    Class<?> paramType = parameter.getParameterType();
    if (paramValues == null) {
        return null;
    }/*from   w  w w  . j  ava  2 s .co  m*/

    // ?
    //      for (int i = 0; i < paramValues.length; i++) {
    //         String paramValue = paramValues[i];
    //         String encodedParamValue = new String(paramValue.getBytes("ISO-8859-1"), encoding);
    //         paramValues[i] = encodedParamValue;
    //      }
    try {
        if (paramValues.length == 1) {
            String text = paramValues[0];
            Type type = parameter.getGenericParameterType();

            if (MapWapper.class.isAssignableFrom(paramType)) {
                MapWapper<?, ?> jsonMap = (MapWapper<?, ?>) paramType.newInstance();

                MapType mapType = (MapType) getJavaType(HashMap.class);

                if (type instanceof ParameterizedType) {
                    mapType = (MapType) mapType
                            .narrowKey((Class<?>) ((ParameterizedType) type).getActualTypeArguments()[0]);
                    mapType = (MapType) mapType.narrowContentsBy(
                            (Class<?>) ((ParameterizedType) type).getActualTypeArguments()[1]);
                }
                jsonMap.setInnerMap(mapper.<Map>readValue(text, mapType));
                return jsonMap;
            }

            JavaType javaType = getJavaType(paramType);

            if (Collection.class.isAssignableFrom(paramType)) {
                javaType = javaType
                        .narrowContentsBy((Class<?>) ((ParameterizedType) type).getActualTypeArguments()[0]);
            }
            return mapper.readValue(paramValues[0], javaType);
        }

    } catch (Exception e) {
        throw new JsonMappingException("Could not read request json parameter", e);
    }

    throw new UnsupportedOperationException("too many request json parameter '" + name
            + "' for method parameter type [" + paramType + "], only support one json parameter");
}

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