    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.beanutils.converters;
    018
    019import java.net.URL;
    020
    021/**
    022 * {@link org.apache.commons.beanutils.Converter} implementation that handles conversion
    023 * to and from <strong>java.net.URL</strong> objects.
    024 * <p>
    025 * Can be configured to either return a <em>default value</em> or throw a
    026 * <code>ConversionException</code> if a conversion error occurs.
    027 *
    028 * @since 1.3
    029 */
    030public final class URLConverter extends AbstractConverter {
    031
    032    /**
    033     * Construct a <strong>java.net.URL</strong> <em>Converter</em> that throws
    034     * a <code>ConversionException</code> if an error occurs.
    035     */
    036    public URLConverter() {
    037    }
    038
    039    /**
    040     * Construct a <strong>java.net.URL</strong> <em>Converter</em> that returns
    041     * a default value if an error occurs.
    042     *
    043     * @param defaultValue The default value to be returned
    044     * if the value to be converted is missing or an error
    045     * occurs converting the value.
    046     */
    047    public URLConverter(final Object defaultValue) {
    048        super(defaultValue);
    049    }
    050
    051    /**
    052     * <p>Convert a java.net.URL or object into a String.</p>
    053     *
    054     * @param <T> Target type of the conversion.
    055     * @param type Data type to which this value should be converted.
    056     * @param value The input value to be converted.
    057     * @return The converted value.
    058     * @throws Throwable if an error occurs converting to the specified type
    059     * @since 1.8.0
    060     */
    061    @Override
    062    protected <T> T convertToType(final Class<T> type, final Object value) throws Throwable {
    063        if (URL.class.equals(type)) {
    064            return type.cast(new URL(value.toString()));
    065        }
    066
    067        throw conversionException(type, value);
    068    }
    069
    070    /**
    071     * Return the default type this <code>Converter</code> handles.
    072     *
    073     * @return The default type this <code>Converter</code> handles.
    074     * @since 1.8.0
    075     */
    076    @Override
    077    protected Class<?> getDefaultType() {
    078        return URL.class;
    079    }
    080
    081}