org.joda.money.DefaultCurrencyUnitDataProvider Maven / Gradle / Ivy
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/*
* 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.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
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 two files.
* Firstly it reads the mandatory resource named {@code /org/joda/money/MoneyData.csv}.
* Then it reads the optional resource named {@code /org/joda/money/MoneyDataExtension.csv}.
* Both will be read as the first found on the classpath.
* The second file may replace entries in the first file.
*/
class DefaultCurrencyUnitDataProvider extends CurrencyUnitDataProvider {
/** Regex format for the csv line. */
private static final Pattern REGEX_LINE = Pattern.compile("([A-Z]{3}),(-1|[0-9]{1,3}),(-1|[0-9]),([A-Z]*)#?.*");
/**
* Registers all the currencies known by this provider.
*
* @throws Exception if an error occurs
*/
@Override
protected void registerCurrencies() throws Exception {
loadCurrenciesFromFile("/org/joda/money/MoneyData.csv", true);
loadCurrenciesFromFile("/org/joda/money/MoneyDataExtension.csv", false);
}
/**
* Loads Currencies from a file
*
* @param fileName the file to load, not null
* @param isNecessary whether or not the file is necessary
* @throws Exception if a necessary file is not found
*/
private void loadCurrenciesFromFile(String fileName, boolean isNecessary) throws Exception {
InputStream in = null;
Exception resultEx = null;
try {
in = getClass().getResourceAsStream(fileName);
if (in == null && isNecessary) {
throw new FileNotFoundException("Data file " + fileName + " not found");
} else if (in == null && !isNecessary) {
return; // no extension file found, no problem. just return
}
BufferedReader reader = new BufferedReader(new InputStreamReader(in, "UTF-8"));
String line;
while ((line = reader.readLine()) != null) {
Matcher matcher = REGEX_LINE.matcher(line);
if (matcher.matches()) {
List countryCodes = new ArrayList();
String codeStr = matcher.group(4);
String currencyCode = matcher.group(1);
if (codeStr.length() % 2 == 1) {
continue; // invalid line
}
for (int i = 0; i < codeStr.length(); i += 2) {
countryCodes.add(codeStr.substring(i, i + 2));
}
int numericCode = Integer.parseInt(matcher.group(2));
int digits = Integer.parseInt(matcher.group(3));
registerCurrency(currencyCode, numericCode, digits, countryCodes);
}
}
} catch (Exception ex) {
resultEx = ex;
throw ex;
} finally {
if (in != null) {
if (resultEx != null) {
try {
in.close();
} catch (IOException ignored) {
throw resultEx;
}
} else {
in.close();
}
}
}
}
}