1 package org.neuclear.ledger.prevalent;
2
3 import org.prevayler.TransactionWithQuery;
4 import org.neuclear.ledger.*;
5
6 import java.util.Date;
7 import java.util.Iterator;
8
9 /***
10 * Created by IntelliJ IDEA.
11 * User: pelleb
12 * Date: Mar 20, 2004
13 * Time: 1:31:57 PM
14 * To change this template use File | Settings | File Templates.
15 */
16 public class PostHeldTransaction implements TransactionWithQuery{
17
18 final UnPostedHeldTransaction tran;
19
20
21 PostHeldTransaction(UnPostedHeldTransaction tran) {
22 this.tran = tran;
23 }
24
25 /***
26 * Performs the necessary modifications on the given prevalentSystem and also returns an Object or throws an Exception.
27 * This method is called by Prevayler.execute(TransactionWithQuery) to execute this TransactionWithQuery on the given Prevalent System. See org.prevayler.demos for usage examples.
28 *
29 * @param prevalentSystem The system on which this TransactionWithQuery will execute.
30 * @param executionTime The time at which this TransactionWithQuery is being executed. Every Transaction executes completely within a single moment in time. Logically, a Prevalent System's time does not pass during the execution of a Transaction.
31 */
32 public Object executeAndQuery(Object prevalentSystem, Date executionTime) throws Exception {
33 LedgerSystem system=(LedgerSystem) prevalentSystem;
34 HoldTable table=system.getHoldTable();
35 if (table.exists(tran.getId()))
36 throw new TransactionExistsException(null,tran.getId());
37 if (table.exists(tran.getRequestId()))
38 throw new TransactionExistsException(null,tran.getRequestId());
39 Iterator iter=tran.getItems();
40 while (iter.hasNext()) {
41 TransactionItem item = (TransactionItem) iter.next();
42 if (system.getAvailableBalance(item.getBook())+item.getAmount()<0)
43 throw new InsufficientFundsException(null,item.getBook(),item.getAmount());
44 }
45
46 PostedHeldTransaction posted=new PostedHeldTransaction(tran,executionTime);
47 table.add(posted);
48 return posted;
49 }
50 }
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