com.indragie.cmput301as1.ExpenseItemJSONDeserializer.java Source code

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Here is the source code for com.indragie.cmput301as1.ExpenseItemJSONDeserializer.java

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/* 
 * Copyright (C) 2015 Indragie Karunaratne
 * 
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *  
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.indragie.cmput301as1;

import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.reflect.Type;
import java.util.Date;

import org.joda.money.Money;

import android.net.Uri;
import android.util.Base64;

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;

/**
 * Deserializes an {@link ExpenseItem} from JSON.
 */
public class ExpenseItemJSONDeserializer implements JsonDeserializer<ExpenseItem> {
    /**
     * Controller used to generate receipt URIs.
     */
    private ExpenseItemReceiptController receiptController;

    /**
     * Creates an instance of {@link ExpenseItemJSONDeserializer}
     * @param receiptController Controller used to generate receipt URIs.
     */
    public ExpenseItemJSONDeserializer(ExpenseItemReceiptController receiptController) {
        this.receiptController = receiptController;
    }

    /* (non-Javadoc)
     * @see com.google.gson.JsonDeserializer#deserialize(com.google.gson.JsonElement, java.lang.reflect.Type, com.google.gson.JsonDeserializationContext)
     */
    @Override
    public ExpenseItem deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
            throws JsonParseException {
        JsonObject obj = json.getAsJsonObject();
        if (obj == null)
            return null;

        String name = JSONHelpers.getStringIfPossible(obj.get("name"));
        String description = JSONHelpers.getStringIfPossible(obj.get("description"));
        String category = JSONHelpers.getStringIfPossible(obj.get("category"));
        boolean incomplete = JSONHelpers.getBooleanIfPossible(obj.get("incomplete"));
        JsonObject amountObject = JSONHelpers.getJsonObjectIfPossible(obj.get("amount"));
        JsonElement dateElement = obj.get("date");
        String receiptBase64Str = JSONHelpers.getStringIfPossible(obj.get("receipt_base64"));

        Money amount = null;
        if (amountObject != null) {
            amount = context.deserialize(amountObject, Money.class);
        }

        Date date = null;
        if (dateElement != null) {
            date = context.deserialize(dateElement, Date.class);
        }

        ExpenseItem item = new ExpenseItem(name, description, category, amount, date);
        item.setIncomplete(incomplete);

        if (receiptBase64Str != null) {
            Uri receiptUri = receiptController.constructNewReceiptImageUri();
            byte buffer[] = Base64.decode(receiptBase64Str, Base64.DEFAULT);
            try {
                FileOutputStream fos = new FileOutputStream(receiptUri.getPath(), false);
                fos.write(buffer);
                fos.flush();
                fos.close();
                item.setReceiptUri(receiptUri);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        return item;
    }
}