Android Open Source - SurveySDK_android Serialization Manager

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License

The source code is released under:
Apache License
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Java Source Code

package com.survey.android.db;
//from w  ww .  j  ava  2 s  .c  om
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import android.content.Context;
import android.util.Log;

import com.survey.android.containers.PollContainer;
import com.survey.android.model.AnswerModel;
//import dalvik.system.TemporaryDirectory;

public class SerializationManager {
  public static String TAG = "SERIALIZATION_MANAGER";

  /**
   * Serializes object to byte array ( necessarily object needs to implement
   * Serializable interface )
   * 
   * @param o
   *            - object for serialization
   * @return byte array - representation of object to byte array
   */
  public static byte[] serializeObject(Object o) {
    ByteArrayOutputStream bos = new ByteArrayOutputStream();

    try {
      ObjectOutput out = new ObjectOutputStream(bos);
      out.writeObject(o);
      out.close();
      byte[] buf = bos.toByteArray();
      return buf;
    } catch (IOException ioe) {
      Log.e("serializeObject", "error", ioe);
      return null;
    }
  }

  /**
   * Deserializes byte array to instance of Object ( for further use needs to
   * apply appropriate cast )
   * 
   * @param b
   *            - byte array ( serialized object )
   * @return deserialized instance of Object or null in a case of error
   */
  public static Object deserializeObject(byte[] b) {
    try {
      ObjectInputStream in = new ObjectInputStream(
          new ByteArrayInputStream(b));
      Object object = in.readObject();
      in.close();
      return object;
    } catch (ClassNotFoundException cnfe) {
      Log.e("deserializeObject", "class not found error", cnfe);
      return null;
    } catch (IOException ioe) {
      Log.e("deserializeObject", "io error", ioe);
      return null;
    }
  }

  // Specific for PollContainer class ( only instance of that class is going
  // to be serialized ever )
  // makes things easier but makes a little dirty scope of class

  /**
   * Deserializes byte array to instance of PollContainer class ( uses
   * additional parameter because Context is transient and has value of null
   * when object is deserialized )
   * 
   * @param array
   *            - byte array representation of object
   * @param context
   *            - set field from PollContainer to value context ( current
   *            activity connected to pollContainer )
   * @return instance of PollContainer class or null in a case of error
   */
  public static PollContainer deserializePollContainer(byte[] array,
      Context context) {
    try {
      PollContainer tempContainer = (PollContainer) deserializeObject(array);
      if (tempContainer != null) {
        tempContainer.setContext(context);
      }
      // *************************************************************************************************
      List<AnswerModel> tempList = tempContainer.getAnswers();
      if (tempList != null) {
        Set<String> set = new HashSet<String>();
        for (AnswerModel a : tempList) {
          if (!a.getQuestionId().equals("token")) {
            set.add(a.getQuestionId());
          }
        }
        
        int tempCursor = tempContainer.getCursor();
        if (set.size() > 0 && tempCursor >= set.size()) {
          tempContainer.setCursor(set.size() - 1);
        }
        tempContainer.getSection().setType("restored");
      }
      // *************************************************************************************************
      return tempContainer;
    } catch (Exception e) {
      e.printStackTrace();
      return null;
    }
  }
}
Java Source Code List
