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

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Here is the source code for com.claresco.tinman.json.XapiSubStatementJson.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.lang.reflect.Type;
import java.util.UUID;

import com.claresco.tinman.lrs.XapiActor;
import com.claresco.tinman.lrs.XapiObject;
import com.claresco.tinman.lrs.XapiStatement;
import com.claresco.tinman.lrs.XapiSubStatement;
import com.claresco.tinman.lrs.XapiVerb;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

/**
 * XapiSubStatementDeserializer.java
 *
 *
 *
 *
 *
 * @author rheza
 * on Jan 27, 2014
 * 
 */

public class XapiSubStatementJson implements JsonDeserializer<XapiSubStatement>, JsonSerializer<XapiSubStatement> {

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

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

        return result;
    }

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

        // check if there are invalid elements: id, stored, version, authority
        if (JsonUtility.getElementAsString(theJsonSubStatement, "id") != null) {
            throw new XapiBadSubStatementException("Should not have an id");
        }

        if (JsonUtility.getElementAsString(theJsonSubStatement, "version") != null) {
            throw new XapiBadSubStatementException("Should not have a version");
        }

        if (JsonUtility.getElementAsString(theJsonSubStatement, "authority") != null) {
            throw new XapiBadSubStatementException("Should not have an authority");
        }

        // Retrieve actor, verb, and object
        XapiActor theActor;
        XapiVerb theVerb;
        XapiObject theObject;

        // Fix this, when it is null. do something else   
        if (JsonUtility.hasElement(theJsonSubStatement, "actor")) {
            theActor = JsonUtility.delegateDeserialization(arg2, theJsonSubStatement.get("actor"), XapiActor.class);
        } else {
            theActor = null;
        }

        if (JsonUtility.hasElement(theJsonSubStatement, "verb")) {
            theVerb = JsonUtility.delegateDeserialization(arg2, theJsonSubStatement.get("verb"), XapiVerb.class);
        } else {
            theVerb = null;
        }

        if (JsonUtility.hasElement(theJsonSubStatement, "object")) {
            theObject = JsonUtility.delegateDeserialization(arg2, theJsonSubStatement.get("object"),
                    XapiObject.class);
            if (theObject.getObjectType().equals("SubStatement")) {
                throw new XapiBadSubStatementException("The substatement must not contain another substatement");
            }
            if (theObject instanceof XapiSubStatement) {
                throw new XapiBadSubStatementException("The substatement must not contain another substatement");
            }
        } else {
            theObject = null;
        }

        // Add the rest later on
        XapiSubStatement theSubStatement = new XapiSubStatement(theActor, theVerb, theObject);

        if (!theSubStatement.isValid()) {
            throw new XapiBadSubStatementException(
                    "Substatement missing at least one of the actor, verb, or object");
        }

        return new XapiSubStatement(theActor, theVerb, theObject);
    }
}