spring NumberStyleFormatter 源码
spring NumberStyleFormatter 代码
文件路径：/spring-context/src/main/java/org/springframework/format/number/NumberStyleFormatter.java
/*
* Copyright 2002-2021 the original author or authors.
*
* 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
*
* https://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.springframework.format.number;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Locale;
import org.springframework.lang.Nullable;
/**
* A general-purpose number formatter using NumberFormat's number style.
*
* <p>Delegates to {@link java.text.NumberFormat#getInstance(Locale)}.
* Configures BigDecimal parsing so there is no loss in precision.
* Allows configuration over the decimal number pattern.
* The {@link #parse(String, Locale)} routine always returns a BigDecimal.
*
* @author Keith Donald
* @author Juergen Hoeller
* @since 4.2
* @see #setPattern
* @see #setLenient
*/
public class NumberStyleFormatter extends AbstractNumberFormatter {
@Nullable
private String pattern;
/**
* Create a new NumberStyleFormatter without a pattern.
*/
public NumberStyleFormatter() {
}
/**
* Create a new NumberStyleFormatter with the specified pattern.
* @param pattern the format pattern
* @see #setPattern
*/
public NumberStyleFormatter(String pattern) {
this.pattern = pattern;
}
/**
* Specify the pattern to use to format number values.
* If not specified, the default DecimalFormat pattern is used.
* @see java.text.DecimalFormat#applyPattern(String)
*/
public void setPattern(String pattern) {
this.pattern = pattern;
}
@Override
public NumberFormat getNumberFormat(Locale locale) {
NumberFormat format = NumberFormat.getInstance(locale);
if (!(format instanceof DecimalFormat decimalFormat)) {
if (this.pattern != null) {
throw new IllegalStateException("Cannot support pattern for non-DecimalFormat: " + format);
}
return format;
}
decimalFormat.setParseBigDecimal(true);
if (this.pattern != null) {
decimalFormat.applyPattern(this.pattern);
}
return decimalFormat;
}
}
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