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

Introduction

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

Source

/*******************************************************************************
 * 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:
 *    Chris Casola
 ******************************************************************************/

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

import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;

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.core.models.User;

/**
 * Custom JSON deserializer for the DefectChangeset class
 */
public class DefectChangesetDeserializer implements JsonDeserializer<DefectChangeset> {

    @Override
    public DefectChangeset deserialize(JsonElement json, Type type, JsonDeserializationContext context)
            throws JsonParseException {

        // hash map to hold the deserialized FieldChange objects
        HashMap<String, FieldChange<?>> changesMap = new HashMap<String, FieldChange<?>>();

        JsonObject changeSet = json.getAsJsonObject();
        if (changeSet.has("changes")) {
            JsonObject changes = changeSet.get("changes").getAsJsonObject();
            if (changes.has("title")) {
                JsonObject titleObj = changes.get("title").getAsJsonObject();
                String oldTitle = context.deserialize(titleObj.get("oldValue"), String.class);
                String newTitle = context.deserialize(titleObj.get("newValue"), String.class);
                changesMap.put("title", new FieldChange<String>(oldTitle, newTitle));
            }
            if (changes.has("description")) {
                JsonObject descriptionObj = changes.get("description").getAsJsonObject();
                String oldDesc = context.deserialize(descriptionObj.get("oldValue"), String.class);
                String newDesc = context.deserialize(descriptionObj.get("newValue"), String.class);
                changesMap.put("description", new FieldChange<String>(oldDesc, newDesc));
            }
            if (changes.has("assignee")) {
                JsonObject assigneeObj = changes.get("assignee").getAsJsonObject();
                User oldUser = context.deserialize(assigneeObj.get("oldValue"), User.class);
                User newUser = context.deserialize(assigneeObj.get("newValue"), User.class);
                changesMap.put("assignee", new FieldChange<User>(oldUser, newUser));
            }
            if (changes.has("tags")) {
                JsonObject tagsObj = changes.get("tags").getAsJsonObject();
                Tag[] oldTags = context.deserialize(tagsObj.get("oldValue"), Tag[].class);
                Tag[] newTags = context.deserialize(tagsObj.get("newValue"), Tag[].class);
                changesMap.put("tags",
                        new FieldChange<Set<Tag>>(new HashSet<Tag>(new ArrayList<Tag>(Arrays.asList(oldTags))),
                                new HashSet<Tag>(new ArrayList<Tag>(Arrays.asList(newTags)))));
            }
            if (changes.has("status")) {
                JsonObject statusObj = changes.get("status").getAsJsonObject();
                DefectStatus oldStatus = context.deserialize(statusObj.get("oldValue"), DefectStatus.class);
                DefectStatus newStatus = context.deserialize(statusObj.get("newValue"), DefectStatus.class);
                changesMap.put("status", new FieldChange<DefectStatus>(oldStatus, newStatus));
            }

            // reconstruct the DefectChangeset
            DefectChangeset retVal = new DefectChangeset();
            retVal.setChanges(changesMap);
            retVal.setDate((Date) (context.deserialize(changeSet.get("date"), Date.class)));
            retVal.setUser((User) (context.deserialize(changeSet.get("user"), User.class)));

            // return the DefectChangeset
            return retVal;
        } else {
            throw new JsonParseException("DefectChangeset type is unrecognized");
        }
    }
}