    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 *     https://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.configuration2.io;
    018
    019import java.net.URL;
    020
    021/**
    022 * A specialized implementation of {@code FileLocationStrategy} which checks whether a passed in {@link FileLocator}
    023 * already has a defined URL.
    024 * <p>
    025 * {@link FileLocator} objects that have a URL already reference a file in an unambiguous way. Therefore, this strategy
    026 * just returns the URL of the passed in {@code FileLocator}. It can be used as a first step of the file resolving
    027 * process. If it fails, more sophisticated attempts for resolving the file can be made.
    028 * </p>
    029 * <p>
    030 * See {@link AbstractFileLocationStrategy} learn how to grant an deny URL schemes and hosts.
    031 * </p>
    032 *
    033 * @see AbstractFileLocationStrategy
    034 * @since 2.0
    035 */
    036public class ProvidedURLLocationStrategy extends AbstractFileLocationStrategy {
    037
    038    /**
    039     * Builds new instances of {@link ProvidedURLLocationStrategy}.
    040     *
    041     * @return a new builder.
    042     * @since 2.15.0
    043     */
    044    public static StrategyBuilder<ProvidedURLLocationStrategy> builder() {
    045        return new StrategyBuilder<>(ProvidedURLLocationStrategy::new);
    046    }
    047
    048    /**
    049     * Constructs a new instance where URL resources are bound by {@link AbstractFileLocationStrategy.AbstractBuilder}.
    050     */
    051    public ProvidedURLLocationStrategy() {
    052    }
    053
    054    /**
    055     * Constructs a new instance where URL resources are bound by {@link AbstractFileLocationStrategy.AbstractBuilder}.
    056     *
    057     * @param builder How to build the instance.
    058     * @since 2.15.0
    059     */
    060    public ProvidedURLLocationStrategy(final AbstractBuilder<?, ?> builder) {
    061        super(builder);
    062    }
    063
    064    /**
    065     * {@inheritDoc} This implementation just returns the URL stored in the given {@code FileLocator}.
    066     */
    067    @Override
    068    public URL locate(final FileSystem fileSystem, final FileLocator locator) {
    069        return check(locator.getSourceURL());
    070    }
    071
    072}