edu.wpi.cs.wpisuitetng.modules.defecttracker.models.DefectEventDeserializer.java Source code

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Here is the source code for edu.wpi.cs.wpisuitetng.modules.defecttracker.models.DefectEventDeserializer.java

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/*******************************************************************************
 * Copyright (c) 2013 -- WPI Suite
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Andrew Hurle
 ******************************************************************************/

package edu.wpi.cs.wpisuitetng.modules.defecttracker.models;

import java.lang.reflect.Type;

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 edu.wpi.cs.wpisuitetng.modules.defecttracker.models.DefectEvent.EventType;

/**
 * Responsible for deserializing a DefectEvent.
 */
class DefectEventDeserializer implements JsonDeserializer<DefectEvent> {
    @Override
    public DefectEvent deserialize(JsonElement element, Type type, JsonDeserializationContext context)
            throws JsonParseException {
        // we need to switch on the type field to figure out the concrete class to instantiate
        JsonObject object = element.getAsJsonObject();
        if (!object.has("type")) {
            throw new JsonParseException("DefectEvent does not have type information");
        }
        EventType eType = context.deserialize(object.get("type"), EventType.class);
        if (eType != null) { // type could be any garbage string, eType null if not in enum
            switch (eType) {
            case CHANGESET:
                return context.deserialize(element, DefectChangeset.class);
            case COMMENT:
                return context.deserialize(element, Comment.class);
            }
        }
        throw new JsonParseException("DefectEvent type is unrecognized");
    }
}