1 /*
2 * Copyright 2009-2013 Stephen Colebourne
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package org.joda.money;
17
18 import java.io.BufferedReader;
19 import java.io.FileNotFoundException;
20 import java.io.InputStream;
21 import java.io.InputStreamReader;
22 import java.util.ArrayList;
23 import java.util.List;
24 import java.util.regex.Matcher;
25 import java.util.regex.Pattern;
26
27 /**
28 * Provider for available currencies using a file.
29 * <p>
30 * This reads currencies from two files.
31 * Firstly it reads the mandatory resource named {@code /org/joda/money/MoneyData.csv}.
32 * Then it reads the optional resource named {@code /org/joda/money/MoneyDataExtension.csv}.
33 * Both will be read as the first found on the classpath.
34 * The second file may replace entries in the first file.
35 */
36 class DefaultCurrencyUnitDataProvider extends CurrencyUnitDataProvider {
37
38 /** Regex format for the csv line. */
39 private static final Pattern REGEX_LINE = Pattern.compile("([A-Z]{3}),(-1|[0-9]{1,3}),(-1|[0-9]),([A-Z]*)#?.*");
40
41 /**
42 * Registers all the currencies known by this provider.
43 *
44 * @throws Exception if an error occurs
45 */
46 @Override
47 protected void registerCurrencies() throws Exception {
48 loadCurrenciesFromFile("/org/joda/money/MoneyData.csv", true);
49 loadCurrenciesFromFile("/org/joda/money/MoneyDataExtension.csv", false);
50 }
51
52 /**
53 * Loads Currencies from a file
54 *
55 * @param fileName the file to load, not null
56 * @param isNecessary whether or not the file is necessary
57 * @throws Exception if a necessary file is not found
58 */
59 private void loadCurrenciesFromFile(String fileName, boolean isNecessary) throws Exception {
60 InputStream in = getClass().getResourceAsStream(fileName);
61 if (in == null && isNecessary) {
62 throw new FileNotFoundException("Data file " + fileName + " not found");
63 } else if (in == null && !isNecessary) {
64 return; // no extension file found, no problem. just return
65 }
66 BufferedReader reader = new BufferedReader(new InputStreamReader(in, "UTF-8"));
67 String line;
68 while ((line = reader.readLine()) != null) {
69 Matcher matcher = REGEX_LINE.matcher(line);
70 if (matcher.matches()) {
71 List<String> countryCodes = new ArrayList<String>();
72 String codeStr = matcher.group(4);
73 String currencyCode = matcher.group(1);
74 if (codeStr.length() % 2 == 1) {
75 continue; // invalid line
76 }
77 for (int i = 0; i < codeStr.length(); i += 2) {
78 countryCodes.add(codeStr.substring(i, i + 2));
79 }
80 int numericCode = Integer.parseInt(matcher.group(2));
81 int digits = Integer.parseInt(matcher.group(3));
82 registerCurrency(currencyCode, numericCode, digits, countryCodes);
83 }
84 }
85 }
86
87 }