com.google.code.pathlet.web.json.JsonRequestProcessor.java Source code

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Here is the source code for com.google.code.pathlet.web.json.JsonRequestProcessor.java

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/*
 * Copyright 2010-2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.code.pathlet.web.json;

import java.beans.PropertyDescriptor;
import java.util.Map;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;

import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.google.code.pathlet.config.convert.BeanInfoWrapper;
import com.google.code.pathlet.config.convert.Property;
import com.google.code.pathlet.core.Path;
import com.google.code.pathlet.web.RequestProcessException;
import com.google.code.pathlet.web.RequestProcessor;

public class JsonRequestProcessor implements RequestProcessor {

    //Key is request parameter name, value is actionObj property name.
    private Map<String, String> parameterPropertyMap;

    private ObjectMapper objectMapper;

    public JsonRequestProcessor(Map<String, String> parameterPropertyMap,
            Map<Class<?>, JsonDeserializer<?>> deserializerMap) {
        this.objectMapper = new ObjectMapper();

        SimpleModule testModule = new SimpleModule("MyModule");

        if (deserializerMap != null && deserializerMap.size() > 0) {
            for (Map.Entry<Class<?>, JsonDeserializer<?>> entry : deserializerMap.entrySet()) {
                Class type = entry.getKey();
                JsonDeserializer serializer = entry.getValue();
                testModule.addDeserializer(type, serializer);
            }
            objectMapper.registerModule(testModule);
        }

        this.parameterPropertyMap = parameterPropertyMap;
    }

    public boolean process(Path requestPath, Object actionObj, HttpServletRequest request)
            throws RequestProcessException {

        Set<String> keys = parameterPropertyMap.keySet();

        try {
            BeanInfoWrapper beanWrapper = new BeanInfoWrapper(actionObj.getClass());
            for (String key : keys) {
                String parameterValue = request.getParameter(key);
                if (parameterValue != null) {
                    String propertyName = parameterPropertyMap.get(key);

                    Class<?> propType = beanWrapper.getPropertyType(propertyName);
                    Object value = objectMapper.readValue(parameterValue, propType);
                    beanWrapper.setProperty(propertyName, actionObj, value);
                }
            }
        } catch (Exception e) {
            throw new RequestProcessException(e);
        }

        return false;
    }

}