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

   1 /*
   2  * Copyright © 2019 Damyan Ivanov.
   3  * This file is part of MoLe.
   4  * MoLe 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  * MoLe 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 MoLe. 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.text.ParseException;
  30 import java.util.ArrayList;
  31 import java.util.Comparator;
  32 import java.util.Date;
  33
  34 public class LedgerTransaction {
  35     private static final String DIGEST_TYPE = "SHA-256";
  36     public final Comparator<LedgerTransactionAccount> comparator =
  37             new Comparator<LedgerTransactionAccount>() {
  38                 @Override
  39                 public int compare(LedgerTransactionAccount o1, LedgerTransactionAccount o2) {
  40                     int res = o1.getAccountName().compareTo(o2.getAccountName());
  41                     if (res != 0) return res;
  42                     res = o1.getCurrency().compareTo(o2.getCurrency());
  43                     if (res != 0) return res;
  44                     return Float.compare(o1.getAmount(), o2.getAmount());
  45                 }
  46             };
  47     private String profile;
  48     private Integer id;
  49     private Date date;
  50     private String description;
  51     private ArrayList<LedgerTransactionAccount> accounts;
  52     private String dataHash;
  53     private boolean dataLoaded;
  54     public LedgerTransaction(Integer id, String dateString, String description)
  55             throws ParseException {
  56         this(id, Globals.parseLedgerDate(dateString), description);
  57     }
  58     public LedgerTransaction(Integer id, Date date, String description) {
  59         this.profile = Data.profile.get().getUuid();
  60         this.id = id;
  61         this.date = date;
  62         this.description = description;
  63         this.accounts = new ArrayList<>();
  64         this.dataHash = null;
  65         dataLoaded = false;
  66     }
  67     public LedgerTransaction(Date date, String description) {
  68         this(null, date, description);
  69     }
  70     public LedgerTransaction(int id) {
  71         this(id, (Date) null, null);
  72     }
  73     public LedgerTransaction(int id, String profileUUID) {
  74         this.profile = profileUUID;
  75         this.id = id;
  76         this.date = null;
  77         this.description = null;
  78         this.accounts = new ArrayList<>();
  79         this.dataHash = null;
  80         this.dataLoaded = false;
  81     }
  82     public ArrayList<LedgerTransactionAccount> getAccounts() {
  83         return accounts;
  84     }
  85     public void addAccount(LedgerTransactionAccount item) {
  86         accounts.add(item);
  87         dataHash = null;
  88     }
  89     public Date getDate() {
  90         return date;
  91     }
  92     public void setDate(Date date) {
  93         this.date = date;
  94         dataHash = null;
  95     }
  96     public String getDescription() {
  97         return description;
  98     }
  99     public void setDescription(String description) {
 100         this.description = description;
 101         dataHash = null;
 102     }
 103     public int getId() {
 104         return id;
 105     }
 106     protected void fillDataHash() {
 107         if (dataHash != null) return;
 108         try {
 109             Digest sha = new Digest(DIGEST_TYPE);
 110             StringBuilder data = new StringBuilder();
 111             data.append(profile);
 112             data.append(getId());
 113             data.append('\0');
 114             data.append(getDescription());
 115             data.append('\0');
 116             data.append(Globals.formatLedgerDate(getDate()));
 117             data.append('\0');
 118             for (LedgerTransactionAccount item : accounts) {
 119                 data.append(item.getAccountName());
 120                 data.append('\0');
 121                 data.append(item.getCurrency());
 122                 data.append('\0');
 123                 data.append(item.getAmount());
 124             }
 125             sha.update(data.toString().getBytes(Charset.forName("UTF-8")));
 126             dataHash = sha.digestToHexString();
 127         }
 128         catch (NoSuchAlgorithmException e) {
 129             throw new RuntimeException(
 130                     String.format("Unable to get instance of %s digest", DIGEST_TYPE), e);
 131         }
 132     }
 133     public boolean existsInDb(SQLiteDatabase db) {
 134         fillDataHash();
 135         try (Cursor c = db
 136                 .rawQuery("SELECT 1 from transactions where data_hash = ?", new String[]{dataHash}))
 137         {
 138             boolean result = c.moveToFirst();
 139             Log.d("db", String.format("Transaction %d (%s) %s", id, dataHash,
 140                     result ? "already present" : "not present"));
 141             return result;
 142         }
 143     }
 144     public void loadData(SQLiteDatabase db) {
 145         if (dataLoaded) return;
 146
 147         try (Cursor cTr = db
 148                 .rawQuery("SELECT date, description from transactions WHERE profile=? AND id=?",
 149                         new String[]{profile, String.valueOf(id)}))
 150         {
 151             if (cTr.moveToFirst()) {
 152                 String dateString = cTr.getString(0);
 153                 try {
 154                     date = Globals.parseLedgerDate(dateString);
 155                 }
 156                 catch (ParseException e) {
 157                     e.printStackTrace();
 158                     throw new RuntimeException(
 159                             String.format("Error parsing date '%s' from " + "transacion %d",
 160                                     dateString, id));
 161                 }
 162                 description = cTr.getString(1);
 163
 164                 try (Cursor cAcc = db.rawQuery("SELECT account_name, amount, currency FROM " +
 165                                                "transaction_accounts WHERE " +
 166                                                "profile=? AND transaction_id = ?",
 167                         new String[]{profile, String.valueOf(id)}))
 168                 {
 169                     while (cAcc.moveToNext()) {
 170 //                        Log.d("transactions",
 171 //                                String.format("Loaded %d: %s %1.2f %s", id, cAcc.getString(0),
 172 //                                        cAcc.getFloat(1), cAcc.getString(2)));
 173                         addAccount(new LedgerTransactionAccount(cAcc.getString(0), cAcc.getFloat(1),
 174                                 cAcc.getString(2)));
 175                     }
 176
 177                     finishLoading();
 178                 }
 179             }
 180         }
 181
 182     }
 183     public String getDataHash() {
 184         return dataHash;
 185     }
 186     public void finishLoading() {
 187         dataLoaded = true;
 188     }
 189 }