    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.commons.beanutils2.converters;
    018
    019/**
    020 * {@link org.apache.commons.beanutils2.Converter} implementation that handles conversion to and from <strong>java.lang.Character</strong> objects.
    021 * <p>
    022 * Can be configured to either return a <em>default value</em> or throw a {@code ConversionException} if a conversion error occurs.
    023 *
    024 * @since 1.3
    025 */
    026public final class CharacterConverter extends AbstractConverter<Character> {
    027
    028    /**
    029     * Constructs a <strong>java.lang.Character</strong> <em>Converter</em> that throws a {@code ConversionException} if an error occurs.
    030     */
    031    public CharacterConverter() {
    032    }
    033
    034    /**
    035     * Constructs a <strong>java.lang.Character</strong> <em>Converter</em> that returns a default value if an error occurs.
    036     *
    037     * @param defaultValue The default value to be returned if the value to be converted is missing or an error occurs converting the value.
    038     */
    039    public CharacterConverter(final char defaultValue) {
    040        super(defaultValue);
    041    }
    042
    043    /**
    044     * Constructs a <strong>java.lang.Character</strong> <em>Converter</em> that returns a default value if an error occurs.
    045     *
    046     * @param defaultValue The default value to be returned if the value to be converted is missing or an error occurs converting the value.
    047     */
    048    public CharacterConverter(final Character defaultValue) {
    049        super(defaultValue);
    050    }
    051
    052    /**
    053     * <p>
    054     * Converts a java.lang.Class or object into a String.
    055     * </p>
    056     *
    057     * @param value The input value to be converted
    058     * @return the converted String value.
    059     * @since 1.8.0
    060     */
    061    @Override
    062    protected String convertToString(final Object value) {
    063        final String strValue = value.toString();
    064        return strValue.isEmpty() ? "" : strValue.substring(0, 1);
    065    }
    066
    067    /**
    068     * <p>
    069     * Converts the input object into a java.lang.Character.
    070     * </p>
    071     *
    072     * @param <T>   Target type of the conversion.
    073     * @param type  Data type to which this value should be converted.
    074     * @param value The input value to be converted.
    075     * @return The converted value.
    076     * @throws Exception if conversion cannot be performed successfully
    077     * @since 1.8.0
    078     */
    079    @Override
    080    protected <T> T convertToType(final Class<T> type, final Object value) throws Exception {
    081        if (Character.class.equals(type) || Character.TYPE.equals(type)) {
    082            return type.cast(Character.valueOf(value.toString().charAt(0)));
    083        }
    084
    085        throw conversionException(type, value);
    086    }
    087
    088    /**
    089     * Gets the default type this {@code Converter} handles.
    090     *
    091     * @return The default type this {@code Converter} handles.
    092     * @since 1.8.0
    093     */
    094    @Override
    095    protected Class<Character> getDefaultType() {
    096        return Character.class;
    097    }
    098
    099}