001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.wicket.util.convert.converter; 018 019import java.math.BigDecimal; 020import java.util.Locale; 021 022import org.apache.wicket.util.convert.IConverter; 023 024 025/** 026 * Converts from Object to Double. 027 * 028 * @author Eelco Hillenius 029 * @author Jonathan Locke 030 */ 031public class DoubleConverter extends AbstractDecimalConverter<Double> 032{ 033 private static final long serialVersionUID = 1L; 034 035 // Double.MIN is the smallest nonzero positive number, not the largest 036 // negative number 037 private static final BigDecimal MIN_VALUE = new BigDecimal(-Double.MAX_VALUE); 038 private static final BigDecimal MAX_VALUE = new BigDecimal(Double.MAX_VALUE); 039 040 /** 041 * The singleton instance for a double converter 042 */ 043 public static final IConverter<Double> INSTANCE = new DoubleConverter(); 044 045 /** 046 * @see org.apache.wicket.util.convert.IConverter#convertToObject(String, java.util.Locale) 047 */ 048 @Override 049 public Double convertToObject(final String value, final Locale locale) 050 { 051 final BigDecimal number = parse(value, MIN_VALUE, MAX_VALUE, locale); 052 053 if (number == null) 054 { 055 return null; 056 } 057 058 return number.doubleValue(); 059 } 060 061 /** 062 * @see org.apache.wicket.util.convert.converter.AbstractConverter#getTargetType() 063 */ 064 @Override 065 protected Class<Double> getTargetType() 066 { 067 return Double.class; 068 } 069}