    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.configuration2.io;
    018
    019import java.io.File;
    020import java.io.InputStream;
    021import java.io.OutputStream;
    022import java.net.MalformedURLException;
    023import java.net.URL;
    024
    025import org.apache.commons.configuration2.ex.ConfigurationException;
    026
    027/**
    028 * Abstract layer to allow various types of file systems.
    029 *
    030 * @since 1.7
    031 */
    032public abstract class FileSystem {
    033    /** Constant for the default logger. */
    034    private static final ConfigurationLogger DEFAULT_LOG = ConfigurationLogger.newDummyLogger();
    035
    036    /** The Logger */
    037    private volatile ConfigurationLogger log;
    038
    039    /** FileSystem options provider */
    040    private volatile FileOptionsProvider optionsProvider;
    041
    042    public abstract String getBasePath(String path);
    043
    044    public abstract String getFileName(String path);
    045
    046    public FileOptionsProvider getFileOptionsProvider() {
    047        return this.optionsProvider;
    048    }
    049
    050    public abstract InputStream getInputStream(URL url) throws ConfigurationException;
    051
    052    /**
    053     * Not abstract for binary compatibility.
    054     *
    055     * @param url TODO
    056     * @param urlConnectionOptions Ignored.
    057     * @return TODO
    058     * @throws ConfigurationException TODO
    059     *
    060     * @since 2.8.0
    061     */
    062    public InputStream getInputStream(final URL url, final URLConnectionOptions urlConnectionOptions) throws ConfigurationException {
    063        return getInputStream(url);
    064    }
    065
    066    /**
    067     * Returns the logger used by this FileSystem.
    068     *
    069     * @return the logger
    070     */
    071    public ConfigurationLogger getLogger() {
    072        final ConfigurationLogger result = log;
    073        return result != null ? result : DEFAULT_LOG;
    074    }
    075
    076    public abstract OutputStream getOutputStream(File file) throws ConfigurationException;
    077
    078    public abstract OutputStream getOutputStream(URL url) throws ConfigurationException;
    079
    080    public abstract String getPath(File file, URL url, String basePath, String fileName);
    081
    082    public abstract URL getURL(String basePath, String fileName) throws MalformedURLException;
    083
    084    public abstract URL locateFromURL(String basePath, String fileName);
    085
    086    /**
    087     * Set the FileOptionsProvider
    088     *
    089     * @param provider The FileOptionsProvider
    090     */
    091    public void setFileOptionsProvider(final FileOptionsProvider provider) {
    092        this.optionsProvider = provider;
    093    }
    094
    095    /**
    096     * Allows setting the logger to be used by this FileSystem. This method makes it possible for clients to exactly control
    097     * logging behavior. Per default a logger is set that will ignore all log messages. Derived classes that want to enable
    098     * logging should call this method during their initialization with the logger to be used. Passing in a <b>null</b>
    099     * argument disables logging.
    100     *
    101     * @param log the new logger
    102     */
    103    public void setLogger(final ConfigurationLogger log) {
    104        this.log = log;
    105    }
    106}