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}