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 String comment;
  55     private ArrayList<LedgerTransactionAccount> accounts;
  56     private String dataHash;
  57     private boolean dataLoaded;
  58     public LedgerTransaction(Integer id, String dateString, String description)
  59             throws ParseException {
  60         this(id, Globals.parseLedgerDate(dateString), description);
  61     }
  62     public LedgerTransaction(Integer id, Date date, String description,
  63                              MobileLedgerProfile profile) {
  64         this.profile = profile.getUuid();
  65         this.id = id;
  66         this.date = date;
  67         this.description = description;
  68         this.accounts = new ArrayList<>();
  69         this.dataHash = null;
  70         dataLoaded = false;
  71     }
  72     public LedgerTransaction(Integer id, Date date, String description) {
  73         this(id, date, description, Data.profile.getValue());
  74     }
  75     public LedgerTransaction(Date date, String description) {
  76         this(null, date, description);
  77     }
  78     public LedgerTransaction(int id) {
  79         this(id, (Date) null, null);
  80     }
  81     public LedgerTransaction(int id, String profileUUID) {
  82         this.profile = profileUUID;
  83         this.id = id;
  84         this.date = null;
  85         this.description = null;
  86         this.accounts = new ArrayList<>();
  87         this.dataHash = null;
  88         this.dataLoaded = false;
  89     }
  90     public ArrayList<LedgerTransactionAccount> getAccounts() {
  91         return accounts;
  92     }
  93     public void addAccount(LedgerTransactionAccount item) {
  94         accounts.add(item);
  95         dataHash = null;
  96     }
  97     public Date getDate() {
  98         return date;
  99     }
 100     public void setDate(Date date) {
 101         this.date = date;
 102         dataHash = null;
 103     }
 104     public String getDescription() {
 105         return description;
 106     }
 107     public void setDescription(String description) {
 108         this.description = description;
 109         dataHash = null;
 110     }
 111     public String getComment() {
 112         return comment;
 113     }
 114     public void setComment(String comment) {
 115         this.comment = comment;
 116     }
 117     public int getId() {
 118         return id;
 119     }
 120     protected void fillDataHash() {
 121         if (dataHash != null)
 122             return;
 123         try {
 124             Digest sha = new Digest(DIGEST_TYPE);
 125             StringBuilder data = new StringBuilder();
 126             data.append(profile);
 127             data.append(getId());
 128             data.append('\0');
 129             data.append(getDescription());
 130             data.append('\0');
 131             data.append(Globals.formatLedgerDate(getDate()));
 132             data.append('\0');
 133             for (LedgerTransactionAccount item : accounts) {
 134                 data.append(item.getAccountName());
 135                 data.append('\0');
 136                 data.append(item.getCurrency());
 137                 data.append('\0');
 138                 data.append(item.getAmount());
 139                 data.append('\0');
 140                 data.append(item.getComment());
 141             }
 142             sha.update(data.toString()
 143                            .getBytes(Charset.forName("UTF-8")));
 144             dataHash = sha.digestToHexString();
 145         }
 146         catch (NoSuchAlgorithmException e) {
 147             throw new RuntimeException(
 148                     String.format("Unable to get instance of %s digest", DIGEST_TYPE), e);
 149         }
 150     }
 151     public boolean existsInDb(SQLiteDatabase db) {
 152         fillDataHash();
 153         try (Cursor c = db.rawQuery("SELECT 1 from transactions where data_hash = ?",
 154                 new String[]{dataHash}))
 155         {
 156             boolean result = c.moveToFirst();
 157 //            debug("db", String.format("Transaction %d (%s) %s", id, dataHash,
 158 //                    result ? "already present" : "not present"));
 159             return result;
 160         }
 161     }
 162     public void loadData(SQLiteDatabase db) {
 163         if (dataLoaded)
 164             return;
 165
 166         try (Cursor cTr = db.rawQuery(
 167                 "SELECT date, description from transactions WHERE profile=? AND id=?",
 168                 new String[]{profile, String.valueOf(id)}))
 169         {
 170             if (cTr.moveToFirst()) {
 171                 String dateString = cTr.getString(0);
 172                 try {
 173                     date = Globals.parseLedgerDate(dateString);
 174                 }
 175                 catch (ParseException e) {
 176                     e.printStackTrace();
 177                     throw new RuntimeException(
 178                             String.format("Error parsing date '%s' from " + "transaction %d",
 179                                     dateString, id));
 180                 }
 181                 description = cTr.getString(1);
 182
 183                 try (Cursor cAcc = db.rawQuery(
 184                         "SELECT account_name, amount, currency, comment FROM " +
 185                         "transaction_accounts WHERE profile=? AND transaction_id = ?",
 186                         new String[]{profile, String.valueOf(id)}))
 187                 {
 188                     while (cAcc.moveToNext()) {
 189 //                        debug("transactions",
 190 //                                String.format("Loaded %d: %s %1.2f %s", id, cAcc.getString(0),
 191 //                                        cAcc.getFloat(1), cAcc.getString(2)));
 192                         addAccount(new LedgerTransactionAccount(cAcc.getString(0), cAcc.getFloat(1),
 193                                 cAcc.getString(2), cAcc.getString(3)));
 194                     }
 195
 196                     finishLoading();
 197                 }
 198             }
 199         }
 200
 201     }
 202     public String getDataHash() {
 203         return dataHash;
 204     }
 205     public void finishLoading() {
 206         dataLoaded = true;
 207     }
 208 }