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}