com.claresco.tinman.json.XapiStatementJson.java Source code

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Here is the source code for com.claresco.tinman.json.XapiStatementJson.java

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/**
 * ClarescoExperienceAPI
 * Copyright 
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * Please contact Claresco, www.claresco.com, if you have any questions.
 **/

package com.claresco.tinman.json;

import java.io.BufferedReader;
import java.io.FileReader;
import java.lang.reflect.Type;
import java.util.UUID;

import com.claresco.tinman.lrs.XapiActor;
import com.claresco.tinman.lrs.XapiContext;
import com.claresco.tinman.lrs.XapiObject;
import com.claresco.tinman.lrs.XapiResult;
import com.claresco.tinman.lrs.XapiStatement;
import com.claresco.tinman.lrs.XapiVerb;
import com.google.gson.*;

/**
 * XapiStatementDeserializer.java
 *
 *
 *
 *
 *
 * @author rheza
 * on Jan 21, 2014
 * 
 */

public class XapiStatementJson implements JsonDeserializer<XapiStatement>, JsonSerializer<XapiStatement> {

    /* (non-Javadoc)
     * @see com.google.gson.JsonSerializer#serialize(java.lang.Object, java.lang.reflect.Type, com.google.gson.JsonSerializationContext)
     */
    @Override
    public JsonElement serialize(XapiStatement arg0, Type arg1, JsonSerializationContext arg2) {
        JsonObject result = new JsonObject();

        result.addProperty("id", arg0.getId());

        result.add("actor", arg2.serialize(arg0.getActor()));
        result.add("verb", arg2.serialize(arg0.getVerb()));
        result.add("object", arg2.serialize(arg0.getObject()));

        if (arg0.hasResult()) {
            result.add("result", arg2.serialize(arg0.getResult()));
        }

        if (arg0.hasContext()) {
            result.add("context", arg2.serialize(arg0.getContext()));
        }

        if (arg0.hasTimeStamp()) {
            result.addProperty("timestamp", arg0.getTimeStampAsString());
        }

        return result;
    }

    /* (non-Javadoc)
     * @see com.google.gson.JsonDeserializer#deserialize(com.google.gson.JsonElement, java.lang.reflect.Type, com.google.gson.JsonDeserializationContext)
     */
    @Override
    public XapiStatement deserialize(JsonElement arg0, Type arg1, JsonDeserializationContext arg2)
            throws JsonParseException {
        final JsonObject theStatementJSON = JsonUtility.convertJsonElementToJsonObject(arg0);

        UUID theUUID = null;
        if (JsonUtility.hasElement(theStatementJSON, "id")) {
            String theStatementID = JsonUtility.getElementAsString(theStatementJSON, "id");
            theUUID = UUID.fromString(theStatementID);
        }

        // Retrieve actor, verb, and object
        XapiActor theActor = null;
        XapiVerb theVerb = null;
        XapiObject theObject = null;
        XapiResult theResult = null;
        XapiContext theContext = null;
        String theTimeStamp = null;

        // Get actor
        if (JsonUtility.hasElement(theStatementJSON, "actor")) {
            theActor = JsonUtility.delegateDeserialization(arg2, theStatementJSON.get("actor"), XapiActor.class);
        }

        // Get verb
        if (JsonUtility.hasElement(theStatementJSON, "verb")) {
            theVerb = JsonUtility.delegateDeserialization(arg2, theStatementJSON.get("verb"), XapiVerb.class);
        }

        // Get object
        if (JsonUtility.hasElement(theStatementJSON, "object")) {
            theObject = JsonUtility.delegateDeserialization(arg2, theStatementJSON.get("object"), XapiObject.class);
        }

        // Get result
        if (JsonUtility.hasElement(theStatementJSON, "result")) {
            theResult = JsonUtility.delegateDeserialization(arg2, theStatementJSON.get("result"), XapiResult.class);
        }

        // Get context
        if (JsonUtility.hasElement(theStatementJSON, "context")) {
            theContext = JsonUtility.delegateDeserialization(arg2, theStatementJSON.get("context"),
                    XapiContext.class);
        }

        // Get timestamp
        if (JsonUtility.hasElement(theStatementJSON, "timestamp")) {
            theTimeStamp = JsonUtility.getElementAsString(theStatementJSON, "timestamp");
        }

        XapiStatement theStatement = new XapiStatement(theUUID, theActor, theVerb, theObject, theResult, theContext,
                theTimeStamp);

        // Check if the either actor, verb, or object is missing
        if (!theStatement.isValid()) {
            throw new XapiMissingElementException("Missing at least one of actor, verb, or object");
        }

        return theStatement;
    }

    public static void main(String[] args) {
        Gson gson = JsonUtility.createGson();

        String path = "/Users/rheza/Documents/workspace/ClarescoExperienceAPI/src/com/claresco/tinman/json/Statement9.json";

        try {
            BufferedReader bf = new BufferedReader(new FileReader(path));
            XapiStatement s = gson.fromJson(bf, XapiStatement.class);

            System.out.println(s);

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}