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/*
 * Copyright 2002-2015 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
 *
 *      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.springframework.format.number;

import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Locale;

/**
 * A general-purpose number formatter using NumberFormat's number style.
 *
 * 

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 { 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; } /** * Sets 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)) { if (this.pattern != null) { throw new IllegalStateException("Cannot support pattern for non-DecimalFormat: " + format); } return format; } DecimalFormat decimalFormat = (DecimalFormat) format; decimalFormat.setParseBigDecimal(true); if (this.pattern != null) { decimalFormat.applyPattern(this.pattern); } return decimalFormat; } }





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