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     */
017    package org.apache.commons.beanutils.converters;
018    
019    /**
020     * {@link NumberConverter} implementation that handles conversion to
021     * and from <b>java.lang.Double</b> objects.
022     * <p>
023     * This implementation can be configured to handle conversion either
024     * by using Double's default String conversion, or by using a Locale's pattern
025     * or by specifying a format pattern. See the {@link NumberConverter}
026     * documentation for further details.
027     * <p>
028     * Can be configured to either return a <i>default value</i> or throw a
029     * <code>ConversionException</code> if a conversion error occurs.
030     *
031     * @author Craig R. McClanahan
032     * @version $Revision: 690380 $ $Date: 2008-08-29 21:04:38 +0100 (Fri, 29 Aug 2008) $
033     * @since 1.3
034     */
035    public final class DoubleConverter extends NumberConverter {
036    
037        /**
038         * Construct a <b>java.lang.Double</b> <i>Converter</i> that throws
039         * a <code>ConversionException</code> if an error occurs.
040         */
041        public DoubleConverter() {
042            super(true);
043        }
044    
045        /**
046         * Construct a <b>java.lang.Double</b> <i>Converter</i> that returns
047         * a default value if an error occurs.
048         *
049         * @param defaultValue The default value to be returned
050         * if the value to be converted is missing or an error
051         * occurs converting the value.
052         */
053        public DoubleConverter(Object defaultValue) {
054            super(true, defaultValue);
055        }
056    
057        /**
058         * Return the default type this <code>Converter</code> handles.
059         *
060         * @return The default type this <code>Converter</code> handles.
061         * @since 1.8.0
062         */
063        protected Class getDefaultType() {
064            return Double.class;
065        }
066    
067    }