Android Open Source - Android-CriminalIntent Criminal Intent J S O N Serializer

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Back to project page Android-CriminalIntent.

License

The source code is released under:

MIT License

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Java Source Code

package com.bignerdranch.android.criminalintent;
//from  w  w w. j  a v  a 2  s. c  om
import android.content.Context;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONTokener;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.ArrayList;

/**
 * JSON Serializer for Crime objects
 * Created by mweekes on 12/29/13.
 */
public class CriminalIntentJSONSerializer {

    private Context mContext;
    private String mFilename;

    public CriminalIntentJSONSerializer(Context ctx, String filename) {
        mContext = ctx;
        mFilename = filename;
    }

    public ArrayList<Crime> loadCrimes() throws JSONException, IOException {
        ArrayList<Crime> crimes = new ArrayList<Crime>();
        BufferedReader reader = null;
        try {
            // Open and read the file into a StringBuilder
            InputStream inputStream = mContext.openFileInput(mFilename);
            reader = new BufferedReader(new InputStreamReader(inputStream));
            StringBuilder jsonString = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                // line breaks are omitted and irrelevant
                jsonString.append(line);
            }

            // Parse the JSON use JSONTokener
            JSONArray array = (JSONArray) new JSONTokener(jsonString.toString()).nextValue();
            // Build the array of crimes from JSONObjects
            for (int i = 0; i < array.length(); i++) {
                crimes.add(new Crime(array.getJSONObject(i)));
            }
        } catch (FileNotFoundException fnfe) {
            // Ignore; bootstrap problem
        } finally {
            if (reader != null) {
                reader.close();
            }
        }

        return crimes;
    }

    public void saveCrimes(ArrayList<Crime> crimes) throws JSONException, IOException {
        // Build an array in JSON
        JSONArray array = new JSONArray();
        for (Crime crime : crimes) {
            array.put(crime.toJSON());
        }

        // Write file to disk
        Writer writer = null;
        try {
            OutputStream outputStream = mContext.openFileOutput(mFilename, Context.MODE_PRIVATE);
            writer = new OutputStreamWriter(outputStream);
            writer.write(array.toString());
        } finally {
            if (writer != null) {
                writer.close();
            }
        }
    }
}

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