app/src/main/java/net/ktnx/mobileledger/model/LedgerTransaction.java

   1 /*
   2  * Copyright © 2019 Damyan Ivanov.
   3  * This file is part of Mobile-Ledger.
   4  * Mobile-Ledger is free software: you can distribute it and/or modify it
   5  * under the term of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your opinion), any later version.
   8  *
   9  * Mobile-Ledger is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License terms for details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with Mobile-Ledger. If not, see <https://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.ktnx.mobileledger.model;
  19
  20 import android.database.Cursor;
  21 import android.database.sqlite.SQLiteDatabase;
  22 import android.util.Log;
  23
  24 import net.ktnx.mobileledger.utils.Digest;
  25 import net.ktnx.mobileledger.utils.Globals;
  26
  27 import java.nio.charset.Charset;
  28 import java.security.NoSuchAlgorithmException;
  29 import java.util.ArrayList;
  30 import java.util.Comparator;
  31 import java.util.Date;
  32
  33 public class LedgerTransaction {
  34     private static final String DIGEST_TYPE = "SHA-256";
  35     public final Comparator<LedgerTransactionAccount> comparator =
  36             new Comparator<LedgerTransactionAccount>() {
  37                 @Override
  38                 public int compare(LedgerTransactionAccount o1, LedgerTransactionAccount o2) {
  39                     int res = o1.getAccountName().compareTo(o2.getAccountName());
  40                     if (res != 0) return res;
  41                     res = o1.getCurrency().compareTo(o2.getCurrency());
  42                     if (res != 0) return res;
  43                     return Float.compare(o1.getAmount(), o2.getAmount());
  44                 }
  45             };
  46     private String profile;
  47     private Integer id;
  48     private Date date;
  49     private String description;
  50     private ArrayList<LedgerTransactionAccount> accounts;
  51     private String dataHash;
  52     private boolean dataLoaded;
  53     public LedgerTransaction(Integer id, String dateString, String description) {
  54         this(id, Globals.parseLedgerDate(dateString), description);
  55     }
  56     public LedgerTransaction(Integer id, Date date, String description) {
  57         this.profile = Data.profile.get().getUuid();
  58         this.id = id;
  59         this.date = date;
  60         this.description = description;
  61         this.accounts = new ArrayList<>();
  62         this.dataHash = null;
  63         dataLoaded = false;
  64     }
  65     public LedgerTransaction(Date date, String description) {
  66         this(null, date, description);
  67     }
  68     public LedgerTransaction(int id) {
  69         this(id, (Date) null, null);
  70     }
  71     public ArrayList<LedgerTransactionAccount> getAccounts() {
  72         return accounts;
  73     }
  74     public void addAccount(LedgerTransactionAccount item) {
  75         accounts.add(item);
  76         dataHash = null;
  77     }
  78     public Date getDate() {
  79         return date;
  80     }
  81     public void setDate(Date date) {
  82         this.date = date;
  83         dataHash = null;
  84     }
  85     public String getDescription() {
  86         return description;
  87     }
  88     public void setDescription(String description) {
  89         this.description = description;
  90         dataHash = null;
  91     }
  92     public int getId() {
  93         return id;
  94     }
  95     protected void fillDataHash() {
  96         if (dataHash != null) return;
  97         try {
  98             Digest sha = new Digest(DIGEST_TYPE);
  99             StringBuilder data = new StringBuilder();
 100             data.append(profile);
 101             data.append(getId());
 102             data.append('\0');
 103             data.append(getDescription());
 104             data.append('\0');
 105             for (LedgerTransactionAccount item : accounts) {
 106                 data.append(item.getAccountName());
 107                 data.append('\0');
 108                 data.append(item.getCurrency());
 109                 data.append('\0');
 110                 data.append(item.getAmount());
 111             }
 112             sha.update(data.toString().getBytes(Charset.forName("UTF-8")));
 113             dataHash = sha.digestToHexString();
 114         }
 115         catch (NoSuchAlgorithmException e) {
 116             throw new RuntimeException(
 117                     String.format("Unable to get instance of %s digest", DIGEST_TYPE), e);
 118         }
 119     }
 120     public boolean existsInDb(SQLiteDatabase db) {
 121         fillDataHash();
 122         try (Cursor c = db
 123                 .rawQuery("SELECT 1 from transactions where data_hash = ?", new String[]{dataHash}))
 124         {
 125             boolean result = c.moveToFirst();
 126             Log.d("db", String.format("Transaction %d (%s) %s", id, dataHash,
 127                     result ? "already present" : "not present"));
 128             return result;
 129         }
 130     }
 131     public void loadData(SQLiteDatabase db) {
 132         if (dataLoaded) return;
 133
 134         try (Cursor cTr = db
 135                 .rawQuery("SELECT date, description from transactions WHERE profile=? AND id=?",
 136                         new String[]{profile, String.valueOf(id)}))
 137         {
 138             if (cTr.moveToFirst()) {
 139                 String dateString = cTr.getString(0);
 140                 date = Globals.parseLedgerDate(dateString);
 141                 description = cTr.getString(1);
 142
 143                 try (Cursor cAcc = db.rawQuery("SELECT account_name, amount, currency FROM " +
 144                                                "transaction_accounts WHERE " +
 145                                                "profile=? AND transaction_id = ?",
 146                         new String[]{profile, String.valueOf(id)}))
 147                 {
 148                     while (cAcc.moveToNext()) {
 149 //                        Log.d("transactions",
 150 //                                String.format("Loaded %d: %s %1.2f %s", id, cAcc.getString(0),
 151 //                                        cAcc.getFloat(1), cAcc.getString(2)));
 152                         addAccount(new LedgerTransactionAccount(cAcc.getString(0), cAcc.getFloat(1),
 153                                 cAcc.getString(2)));
 154                     }
 155
 156                     finishLoading();
 157                 }
 158             }
 159         }
 160
 161     }
 162     public String getDataHash() {
 163         return dataHash;
 164     }
 165     public void finishLoading() {
 166         dataLoaded = true;
 167     }
 168 }