Android Open Source - fh-android-sdk F H Sync Utils

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License

The source code is released under:

Copyright (c) 2014 FeedHenry Ltd, All Rights Reserved. Please refer to your contract with FeedHenry for the software license agreement. If you do not have a contract, you do not have a license to use...

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Java Source Code

package com.feedhenry.sdk.sync;
/*from w ww  .  j  a  v  a2  s.c  o  m*/
import java.security.MessageDigest;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.json.fh.JSONArray;
import org.json.fh.JSONException;
import org.json.fh.JSONObject;

public class FHSyncUtils {

  private static final char[] DIGITS = { '0', '1', '2', '3', '4', '5', '6',
      '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

  public static JSONArray sortObj(Object pObject) throws Exception {
    JSONArray results = new JSONArray();
    if (pObject instanceof JSONArray) {
      results = new JSONArray();
      JSONArray castedObj = (JSONArray) pObject;
      for (int i = 0; i < castedObj.length(); i++) {
        JSONObject obj = new JSONObject();
        obj.put("key", i + "");
        Object value = castedObj.get(i);
        if (value instanceof JSONObject || value instanceof JSONArray) {
          obj.put("value", sortObj(value));
        } else {
          obj.put("value", value);
        }
        results.put(obj);
      }
    } else if (pObject instanceof JSONObject) {
      JSONArray keys = ((JSONObject) pObject).names();
      List<String> sortedKeys = sortNames(keys);
      for (int i = 0; i < sortedKeys.size(); i++) {
        JSONObject obj = new JSONObject();
        String key = sortedKeys.get(i);
        Object value = ((JSONObject) pObject).get(key);
        obj.put("key", sortedKeys.get(i));
        if (value instanceof JSONObject || value instanceof JSONArray) {
          obj.put("value", sortObj(value));
        } else {
          obj.put("value", value);
        }
        results.put(obj);
      }
    } else {
      throw new Exception("object is not JSONObject or JSONArray");
    }
    return results;
  }

  public static String generateObjectHash(Object pObject) {
    String hashValue = "";
    try {
      JSONArray sorted = sortObj(pObject);
      hashValue = generateHash(sorted.toString());
    } catch (Exception e) {
      e.printStackTrace();
    }
    return hashValue;
  }

  public static String generateHash(String pText) throws Exception {
    String hashValue = null;
    MessageDigest md = MessageDigest.getInstance("SHA-1");
    md.reset();
    md.update(pText.getBytes("ASCII"));
    hashValue = encodeHex(md.digest());
    return hashValue;
  }

  private static String encodeHex(byte[] pData) {
    int l = pData.length;

    char[] out = new char[l << 1];

    // two characters form the hex value.
    for (int i = 0, j = 0; i < l; i++) {
      out[j++] = DIGITS[(0xF0 & pData[i]) >>> 4];
      out[j++] = DIGITS[0x0F & pData[i]];
    }

    return new String(out);
  }

  private static List<String> sortNames(JSONArray pNames) throws JSONException {
    ArrayList<String> names = new ArrayList<String>();
    if (null != pNames) {
      for (int i = 0; i < pNames.length(); i++) {
        names.add(pNames.getString(i));
      }
      Collections.sort(names);
    }
    return names;
  }
}

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