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
  23 import net.ktnx.mobileledger.utils.Digest;
  24 import net.ktnx.mobileledger.utils.Globals;
  25
  26 import java.nio.charset.Charset;
  27 import java.security.NoSuchAlgorithmException;
  28 import java.text.ParseException;
  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()
  40                                 .compareTo(o2.getAccountName());
  41                     if (res != 0)
  42                         return res;
  43                     res = o1.getCurrency()
  44                             .compareTo(o2.getCurrency());
  45                     if (res != 0)
  46                         return res;
  47                     return Float.compare(o1.getAmount(), o2.getAmount());
  48                 }
  49             };
  50     private String profile;
  51     private Integer id;
  52     private Date date;
  53     private String description;
  54     private ArrayList<LedgerTransactionAccount> accounts;
  55     private String dataHash;
  56     private boolean dataLoaded;
  57     public LedgerTransaction(Integer id, String dateString, String description)
  58             throws ParseException {
  59         this(id, Globals.parseLedgerDate(dateString), description);
  60     }
  61     public LedgerTransaction(Integer id, Date date, String description,
  62                              MobileLedgerProfile profile) {
  63         this.profile = profile.getUuid();
  64         this.id = id;
  65         this.date = date;
  66         this.description = description;
  67         this.accounts = new ArrayList<>();
  68         this.dataHash = null;
  69         dataLoaded = false;
  70     }
  71     public LedgerTransaction(Integer id, Date date, String description) {
  72         this(id, date, description, Data.profile.getValue());
  73     }
  74     public LedgerTransaction(Date date, String description) {
  75         this(null, date, description);
  76     }
  77     public LedgerTransaction(int id) {
  78         this(id, (Date) null, null);
  79     }
  80     public LedgerTransaction(int id, String profileUUID) {
  81         this.profile = profileUUID;
  82         this.id = id;
  83         this.date = null;
  84         this.description = null;
  85         this.accounts = new ArrayList<>();
  86         this.dataHash = null;
  87         this.dataLoaded = false;
  88     }
  89     public ArrayList<LedgerTransactionAccount> getAccounts() {
  90         return accounts;
  91     }
  92     public void addAccount(LedgerTransactionAccount item) {
  93         accounts.add(item);
  94         dataHash = null;
  95     }
  96     public Date getDate() {
  97         return date;
  98     }
  99     public void setDate(Date date) {
 100         this.date = date;
 101         dataHash = null;
 102     }
 103     public String getDescription() {
 104         return description;
 105     }
 106     public void setDescription(String description) {
 107         this.description = description;
 108         dataHash = null;
 109     }
 110     public int getId() {
 111         return id;
 112     }
 113     protected void fillDataHash() {
 114         if (dataHash != null)
 115             return;
 116         try {
 117             Digest sha = new Digest(DIGEST_TYPE);
 118             StringBuilder data = new StringBuilder();
 119             data.append(profile);
 120             data.append(getId());
 121             data.append('\0');
 122             data.append(getDescription());
 123             data.append('\0');
 124             data.append(Globals.formatLedgerDate(getDate()));
 125             data.append('\0');
 126             for (LedgerTransactionAccount item : accounts) {
 127                 data.append(item.getAccountName());
 128                 data.append('\0');
 129                 data.append(item.getCurrency());
 130                 data.append('\0');
 131                 data.append(item.getAmount());
 132             }
 133             sha.update(data.toString()
 134                            .getBytes(Charset.forName("UTF-8")));
 135             dataHash = sha.digestToHexString();
 136         }
 137         catch (NoSuchAlgorithmException e) {
 138             throw new RuntimeException(
 139                     String.format("Unable to get instance of %s digest", DIGEST_TYPE), e);
 140         }
 141     }
 142     public boolean existsInDb(SQLiteDatabase db) {
 143         fillDataHash();
 144         try (Cursor c = db.rawQuery("SELECT 1 from transactions where data_hash = ?",
 145                 new String[]{dataHash}))
 146         {
 147             boolean result = c.moveToFirst();
 148 //            debug("db", String.format("Transaction %d (%s) %s", id, dataHash,
 149 //                    result ? "already present" : "not present"));
 150             return result;
 151         }
 152     }
 153     public void loadData(SQLiteDatabase db) {
 154         if (dataLoaded)
 155             return;
 156
 157         try (Cursor cTr = db.rawQuery(
 158                 "SELECT date, description from transactions WHERE profile=? AND id=?",
 159                 new String[]{profile, String.valueOf(id)}))
 160         {
 161             if (cTr.moveToFirst()) {
 162                 String dateString = cTr.getString(0);
 163                 try {
 164                     date = Globals.parseLedgerDate(dateString);
 165                 }
 166                 catch (ParseException e) {
 167                     e.printStackTrace();
 168                     throw new RuntimeException(
 169                             String.format("Error parsing date '%s' from " + "transacion %d",
 170                                     dateString, id));
 171                 }
 172                 description = cTr.getString(1);
 173
 174                 try (Cursor cAcc = db.rawQuery("SELECT account_name, amount, currency FROM " +
 175                                                "transaction_accounts WHERE " +
 176                                                "profile=? AND transaction_id = ?",
 177                         new String[]{profile, String.valueOf(id)}))
 178                 {
 179                     while (cAcc.moveToNext()) {
 180 //                        debug("transactions",
 181 //                                String.format("Loaded %d: %s %1.2f %s", id, cAcc.getString(0),
 182 //                                        cAcc.getFloat(1), cAcc.getString(2)));
 183                         addAccount(new LedgerTransactionAccount(cAcc.getString(0), cAcc.getFloat(1),
 184                                 cAcc.getString(2)));
 185                     }
 186
 187                     finishLoading();
 188                 }
 189             }
 190         }
 191
 192     }
 193     public String getDataHash() {
 194         return dataHash;
 195     }
 196     public void finishLoading() {
 197         dataLoaded = true;
 198     }
 199 }