X-Git-Url: https://git.ktnx.net/?p=mobile-ledger.git;a=blobdiff_plain;f=app%2Fsrc%2Fmain%2Fjava%2Fnet%2Fktnx%2Fmobileledger%2Fmodel%2FLedgerTransaction.java;h=c4127ab81641eaf679cc91efd7074fddecb0c18c;hp=a103ab3951d92c0ef643f81dbaf15f45c52c1a1c;hb=a686c3293dd0dbbe49db7fc0f287c451d6b2ecd8;hpb=6b740c280c79b0170321f533747cdbfc3e179a29

diff --git a/app/src/main/java/net/ktnx/mobileledger/model/LedgerTransaction.java b/app/src/main/java/net/ktnx/mobileledger/model/LedgerTransaction.java
index a103ab39..c4127ab8 100644
--- a/app/src/main/java/net/ktnx/mobileledger/model/LedgerTransaction.java
+++ b/app/src/main/java/net/ktnx/mobileledger/model/LedgerTransaction.java
@@ -17,47 +17,68 @@
 
 package net.ktnx.mobileledger.model;
 
+import android.database.Cursor;
 import android.database.sqlite.SQLiteDatabase;
 
+import net.ktnx.mobileledger.utils.Digest;
+
+import java.nio.charset.Charset;
+import java.security.NoSuchAlgorithmException;
 import java.util.ArrayList;
+import java.util.Comparator;
 import java.util.Iterator;
-import java.util.List;
 
 public class LedgerTransaction {
-    private String id;
+    private static final String DIGEST_TYPE = "SHA-256";
+    public final Comparator<LedgerTransactionItem> comparator =
+            new Comparator<LedgerTransactionItem>() {
+                @Override
+                public int compare(LedgerTransactionItem o1, LedgerTransactionItem o2) {
+                    int res = o1.getAccountName().compareTo(o2.getAccountName());
+                    if (res != 0) return res;
+                    res = o1.getCurrency().compareTo(o2.getCurrency());
+                    if (res != 0) return res;
+                    return Float.compare(o1.getAmount(), o2.getAmount());
+                }
+            };
+    private Integer id;
     private String date;
     private String description;
-    private List<LedgerTransactionItem> items;
-
-    public LedgerTransaction(String id, String date, String description) {
+    private ArrayList<LedgerTransactionItem> items;
+    private String dataHash;
+    private boolean dataLoaded;
+    public LedgerTransaction(Integer id, String date, String description) {
         this.id = id;
         this.date = date;
         this.description = description;
         this.items = new ArrayList<>();
+        this.dataHash = null;
+        dataLoaded = false;
     }
     public LedgerTransaction(String date, String description) {
         this(null, date, description);
     }
+    public LedgerTransaction(int id) {
+        this(id, null, null);
+    }
     public void add_item(LedgerTransactionItem item) {
         items.add(item);
+        dataHash = null;
     }
-
     public String getDate() {
         return date;
     }
-
     public void setDate(String date) {
         this.date = date;
+        dataHash = null;
     }
-
     public String getDescription() {
         return description;
     }
-
     public void setDescription(String description) {
         this.description = description;
+        dataHash = null;
     }
-
     public Iterator<LedgerTransactionItem> getItemsIterator() {
         return new Iterator<LedgerTransactionItem>() {
             private int pointer = 0;
@@ -72,18 +93,67 @@ public class LedgerTransaction {
             }
         };
     }
-    public String getId() {
+    public int getId() {
         return id;
     }
-
     public void insertInto(SQLiteDatabase db) {
-        db.execSQL("INSERT INTO transactions(id, date, " + "description) values(?, ?, ?)",
-                new String[]{id, date, description});
+        fillDataHash();
+        db.execSQL("INSERT INTO transactions(id, date, description, data_hash) values(?,?,?,?)",
+                new Object[]{id, date, description, dataHash});
+
+        for (LedgerTransactionItem item : items) {
+            db.execSQL("INSERT INTO transaction_accounts(transaction_id, account_name, amount, " +
+                       "currency) values(?, ?, ?, ?)",
+                    new Object[]{id, item.getAccountName(), item.getAmount(), item.getCurrency()});
+        }
+    }
+    private void fillDataHash() {
+        if (dataHash != null) return;
+        try {
+            Digest sha = new Digest(DIGEST_TYPE);
+            StringBuilder data = new StringBuilder();
+            data.append(getId());
+            data.append('\0');
+            data.append(getDescription());
+            data.append('\0');
+            for (LedgerTransactionItem item : items) {
+                data.append(item.getAccountName());
+                data.append('\0');
+                data.append(item.getCurrency());
+                data.append('\0');
+                data.append(item.getAmount());
+            }
+            sha.update(data.toString().getBytes(Charset.forName("UTF-8")));
+            dataHash = sha.digestToHexString();
+        }
+        catch (NoSuchAlgorithmException e) {
+            throw new RuntimeException(
+                    String.format("Unable to get instance of %s digest", DIGEST_TYPE), e);
+        }
+    }
+    public void loadData(SQLiteDatabase db) {
+        if (dataLoaded) return;
+
+        try (Cursor cTr = db.rawQuery("SELECT date, description from transactions WHERE id=?",
+                new String[]{String.valueOf(id)}))
+        {
+            if (cTr.moveToFirst()) {
+                date = cTr.getString(0);
+                description = cTr.getString(1);
+
+                try (Cursor cAcc = db.rawQuery("SELECT account_name, amount, currency FROM " +
+                                               "transaction_accounts WHERE transaction_id = ?",
+                        new String[]{String.valueOf(id)}))
+                {
+                    while (cAcc.moveToNext()) {
+                        add_item(new LedgerTransactionItem(cAcc.getString(0), cAcc.getFloat(1),
+                                cAcc.getString(2)));
+                    }
 
-        for(LedgerTransactionItem item : items) {
-            db.execSQL("INSERT INTO transaction_accounts(transaction_id, account_name, amount, "
-                    + "currency) values(?, ?, ?, ?)", new Object[]{id, item.getAccountName(),
-                                                                   item.getAmount(), item.getCurrency()});
+                    dataLoaded = true;
+                }
+            }
         }
+
     }
 }