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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.johnzon.jsonb.converter;
import jakarta.json.bind.annotation.JsonbNumberFormat;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Queue;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.function.Function;
import java.util.function.Supplier;
public class JsonbNumberConverter extends JsonbLocaleParserConverterBase<Number> {
private final Supplier<NumberFormat> delegateFactory; // NumberFormat is not thread safe
private final Queue<NumberFormat> pool = new ArrayBlockingQueue<>(30); // configurable?
public JsonbNumberConverter(final JsonbNumberFormat numberFormat) {
final String locale = numberFormat.locale();
final String format = numberFormat.value();
final boolean customLocale = !JsonbNumberFormat.DEFAULT_LOCALE.equals(locale);
if (format.isEmpty() && customLocale) {
delegateFactory = () -> NumberFormat.getInstance(newLocale(locale));
} else if (format.isEmpty()) {
delegateFactory = NumberFormat::getInstance;
} else if (customLocale) {
delegateFactory = () -> new DecimalFormat(format, DecimalFormatSymbols.getInstance(newLocale(locale)));
} else {
delegateFactory = () -> new DecimalFormat(format);
}
}
@Override
public String toString(final Number instance) {
return execute(f -> f.format(instance));
}
@Override
public Number fromString(final String text) {
return execute(f -> {
try {
return f.parse(text);
} catch (final ParseException e) {
throw new IllegalArgumentException(e);
}
});
}
private <T> T execute(final Function<NumberFormat, T> function) {
NumberFormat format = pool.poll();
if (format == null) {
format = delegateFactory.get();
}
try {
return function.apply(format);
} finally {
pool.add(format);
}
}
}