    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} implementaion that handles conversion
    023 * to and from <b>java.net.URL</b> objects.
    024 * <p>
    025 * Can be configured to either return a <i>default value</i> or throw a
    026 * <code>ConversionException</code> if a conversion error occurs.
    027 *
    028 * @version $Id$
    029 * @since 1.3
    030 */
    031public final class URLConverter extends AbstractConverter {
    032
    033    /**
    034     * Construct a <b>java.net.URL</b> <i>Converter</i> that throws
    035     * a <code>ConversionException</code> if an error occurs.
    036     */
    037    public URLConverter() {
    038        super();
    039    }
    040
    041    /**
    042     * Construct a <b>java.net.URL</b> <i>Converter</i> that returns
    043     * a default value if an error occurs.
    044     *
    045     * @param defaultValue The default value to be returned
    046     * if the value to be converted is missing or an error
    047     * occurs converting the value.
    048     */
    049    public URLConverter(final Object defaultValue) {
    050        super(defaultValue);
    051    }
    052
    053    /**
    054     * Return the default type this <code>Converter</code> handles.
    055     *
    056     * @return The default type this <code>Converter</code> handles.
    057     * @since 1.8.0
    058     */
    059    @Override
    060    protected Class<?> getDefaultType() {
    061        return URL.class;
    062    }
    063
    064    /**
    065     * <p>Convert a java.net.URL or object into a String.</p>
    066     *
    067     * @param <T> Target type of the conversion.
    068     * @param type Data type to which this value should be converted.
    069     * @param value The input value to be converted.
    070     * @return The converted value.
    071     * @throws Throwable if an error occurs converting to the specified type
    072     * @since 1.8.0
    073     */
    074    @Override
    075    protected <T> T convertToType(final Class<T> type, final Object value) throws Throwable {
    076        if (URL.class.equals(type)) {
    077            return type.cast(new URL(value.toString()));
    078        }
    079
    080        throw conversionException(type, value);
    081    }
    082
    083}