org.joda.money.DefaultCurrencyUnitDataProvider Maven / Gradle / Ivy
Show all versions of joda-money Show documentation
/*
* Copyright 2009-present, Stephen Colebourne
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.joda.money;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Provider for available currencies using a file.
*
* This reads currencies from various files.
* Firstly it reads the mandatory resource named {@code /org/joda/money/CurencyData.csv}.
* Then it reads the mandatory resource named {@code /org/joda/money/CountryData.csv}.
* These files are located in the joda-money jar file.
*
* Then it reads optional resources named {@code META-INF/org/joda/money/CurencyDataExtension.csv}.
* Then it reads optional resources named {@code META-INF/org/joda/money/CountryDataExtension.csv}.
* These will be read using {@link ClassLoader#getResources(String)}.
* These files may augment or replace data from the first two files.
*/
class DefaultCurrencyUnitDataProvider extends CurrencyUnitDataProvider {
/** Regex format for the money csv line. */
private static final Pattern CURRENCY_REGEX_LINE = Pattern.compile("([A-Z]{3}),(-1|[0-9]{1,3}),(-1|[0-9]|[1-2][0-9]|30) *(#.*)?");
/** Regex format for the country csv line. */
private static final Pattern COUNTRY_REGEX_LINE = Pattern.compile("([A-Z]{2}),([A-Z]{3}) *(#.*)?");
/**
* Registers all the currencies known by this provider.
*
* @throws Exception if an error occurs
*/
@Override
protected void registerCurrencies() throws Exception {
parseCurrencies(loadFromFile("/org/joda/money/CurrencyData.csv"));
parseCountries(loadFromFile("/org/joda/money/CountryData.csv"));
parseCurrencies(loadFromFiles("META-INF/org/joda/money/CurrencyDataExtension.csv"));
parseCountries(loadFromFiles("META-INF/org/joda/money/CountryDataExtension.csv"));
}
// loads a file
private List loadFromFile(String fileName) throws Exception {
try (InputStream in = getClass().getResourceAsStream(fileName)) {
if (in == null) {
throw new FileNotFoundException("Data file " + fileName + " not found");
}
BufferedReader reader = new BufferedReader(new InputStreamReader(in, "UTF-8"));
String line;
List content = new ArrayList<>();
while ((line = reader.readLine()) != null) {
content.add(line);
}
return content;
}
}
// loads a file
private List loadFromFiles(String fileName) throws Exception {
List content = new ArrayList<>();
Enumeration en = getClass().getClassLoader().getResources(fileName);
while (en.hasMoreElements()) {
URL url = (URL) en.nextElement();
try (InputStream in = url.openStream()) {
BufferedReader reader = new BufferedReader(new InputStreamReader(in, "UTF-8"));
String line;
while ((line = reader.readLine()) != null) {
content.add(line);
}
}
}
return content;
}
// parse the currencies
private void parseCurrencies(List content) throws Exception {
for (String line : content) {
Matcher matcher = CURRENCY_REGEX_LINE.matcher(line);
if (matcher.matches()) {
String currencyCode = matcher.group(1);
int numericCode = Integer.parseInt(matcher.group(2));
int digits = Integer.parseInt(matcher.group(3));
registerCurrency(currencyCode, numericCode, digits);
}
}
}
// parse the countries
private void parseCountries(List content) throws Exception {
for (String line : content) {
Matcher matcher = COUNTRY_REGEX_LINE.matcher(line);
if (matcher.matches()) {
String countryCode = matcher.group(1);
String currencyCode = matcher.group(2);
registerCountry(countryCode, currencyCode);
}
}
}
}