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