    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    import org.apache.commons.beanutils.Converter;
    020
    021    /**
    022     * Provides a facade for {@link Converter} implementations
    023     * preventing access to any public API in the implementation,
    024     * other than that specified by {@link Converter}.
    025     * <p />
    026     * This implementation can be used to prevent registered {@link Converter}
    027     * implementations that provide configuration options from being
    028     * retrieved and modified.
    029     *
    030     * @version $Revision: 552084 $ $Date: 2007-06-30 04:04:13 +0100 (Sat, 30 Jun 2007) $
    031     * @since 1.8.0
    032     */
    033    public final class ConverterFacade implements Converter {
    034
    035        private final Converter converter;
    036
    037        /**
    038         * Construct a converter which delegates to the specified
    039         * {@link Converter} implementation.
    040         *
    041         * @param converter The converter to delegate to
    042         */
    043        public ConverterFacade(Converter converter) {
    044            if (converter == null) {
    045                throw new IllegalArgumentException("Converter is missing");
    046            }
    047            this.converter = converter;
    048        }
    049
    050        /**
    051         * Convert the input object into an output object of the
    052         * specified type by delegating to the underlying {@link Converter}
    053         * implementation.
    054         *
    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         */
    059        public Object convert(Class type, Object value) {
    060            return converter.convert(type, value);
    061        }
    062
    063        /**
    064         * Provide a String representation of this facade implementation
    065         * sand the underlying {@link Converter} it delegates to.
    066         *
    067         * @return A String representation of this facade implementation
    068         * sand the underlying {@link Converter} it delegates to
    069         */
    070        public String toString() {
    071            return "ConverterFacade[" + converter.toString() + "]";
    072        }
    073
    074    }