org.tsukuba_bunko.lilac.web.controller.JsonRequestParser.java Source code

Introduction

Here is the source code for org.tsukuba_bunko.lilac.web.controller.JsonRequestParser.java

Source

/*
 * All Rights Reserved.
 * Copyright (C) 2012 Tsukuba Bunko.
 *
 * Licensed under the BSD License ("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.tsukuba-bunko.org/licenses/LICENSE.txt
 *
 * 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.
 *
 * $Id:$
 */
package org.tsukuba_bunko.lilac.web.controller;

import java.io.BufferedReader;
import java.io.IOException;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.io.IOUtils;
import org.seasar.cubby.controller.RequestParser;
import org.seasar.framework.exception.IORuntimeException;
import org.seasar.framework.log.Logger;

import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.JsonPrimitive;

/**
 * ?JSON????? {@link RequestParser}
 * @author $Author: $
 * @version $Revision: $ $Date: $
 */
public class JsonRequestParser implements RequestParser {

    /**
     * 
     */
    private static final Logger logger = Logger.getLogger(JsonRequestParser.class);

    /**
     * @see org.seasar.cubby.controller.RequestParser#getParameterMap(javax.servlet.http.HttpServletRequest)
     */
    @Override
    public Map<String, Object[]> getParameterMap(HttpServletRequest request) {
        Object requestData = getJavaObject(parseContent(request));
        if (logger.isDebugEnabled()) {
            logger.debug("requestData=" + requestData);
        }
        Map<String, Object[]> parameterMap = new java.util.HashMap<String, Object[]>();
        parameterMap.put("requestData", new Object[] { requestData });
        parameterMap.putAll(request.getParameterMap());
        return parameterMap;
    }

    /**
     * @see org.seasar.cubby.controller.RequestParser#isParsable(javax.servlet.http.HttpServletRequest)
     */
    @Override
    public boolean isParsable(HttpServletRequest request) {
        String contentType = request.getHeader("Content-Type");
        if (logger.isDebugEnabled()) {
            logger.debug("Expected: application/json, Actual: " + contentType);
        }
        return "application/json".equals(contentType);
    }

    /**
     * JSON???????
     * @param request HTTP
     * @return JSON?
     */
    public JsonElement parseContent(HttpServletRequest request) {
        BufferedReader source = null;
        try {
            source = request.getReader();
            JsonParser parser = new JsonParser();
            return parser.parse(source);
        } catch (IOException ioe) {
            throw new IORuntimeException(ioe);
        } finally {
            IOUtils.closeQuietly(source);
        }
    }

    /**
     * JSON?Java?????
     * @param elementJSON?
     * @return Java
     */
    public Object getJavaObject(JsonElement element) {
        if (element.isJsonObject()) {
            return getJavaObject(element.getAsJsonObject());
        } else if (element.isJsonArray()) {
            return getJavaObject(element.getAsJsonArray());
        } else if (element.isJsonPrimitive()) {
            return getJavaObject(element.getAsJsonPrimitive());
        } else {
            return null;
        }
    }

    /**
     * JavaScript?Java(Map<String, Object>)?????
     * @param jsonObjectJavaScript?
     * @return Map
     */
    public Map<String, Object> getJavaObject(JsonObject jsonObject) {
        Map<String, Object> object = new java.util.HashMap<String, Object>();
        for (Map.Entry<String, JsonElement> entry : jsonObject.entrySet()) {
            object.put(entry.getKey(), getJavaObject(entry.getValue()));
        }
        return object;
    }

    /**
     * JavaScript??Java(List<Object>)?????
     * @param jsonArray JavaScript?? 
     * @return List
     */
    public List<Object> getJavaObject(JsonArray jsonArray) {
        List<Object> array = new java.util.ArrayList<Object>();
        for (JsonElement element : jsonArray) {
            array.add(getJavaObject(element));
        }
        return array;
    }

    /**
     * JavaScript?(?,,)Java?????
     * @param jsonPrimitiveJavaScript?
     * @returnJava
     */
    public Object getJavaObject(JsonPrimitive jsonPrimitive) {
        if (jsonPrimitive.isBoolean()) {
            return jsonPrimitive.getAsBoolean();
        } else if (jsonPrimitive.isNumber()) {
            return jsonPrimitive.getAsNumber();
        } else {
            return jsonPrimitive.getAsString();
        }
    }
}