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/*
 * Copyright 2001-2004 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.net.ftp;
import java.io.BufferedReader;
import java.io.IOException;
import java.util.List;

/**
 * FTPFileEntryParser defines the interface for parsing a single FTP file
 * listing and converting that information into an
 *  FTPFile  instance.
 * Sometimes you will want to parse unusual listing formats, in which
 * case you would create your own implementation of FTPFileEntryParser and
 * if necessary, subclass FTPFile.
 * 

* Here are some examples showing how to use one of the classes that * implement this interface. *

* The first example shows how to get an iterable list of files in which the * more expensive FTPFile objects are not created until needed. This * is suitable for paged displays. It requires that a parser object be created * beforehand: parser is an object (in the package * org.apache.commons.net.ftp.parser) * implementing this inteface. * *

 *    FTPClient f=FTPClient();
 *    f.connect(server);
 *    f.login(username, password);
 *    FTPFileList list = f.createFileList(directory, parser);
 *    FTPFileIterator iter = list.iterator();
 *
 *    while (iter.hasNext()) {
 *       FTPFile[] files = iter.getNext(25);  // "page size" you want
 *       //do whatever you want with these files, display them, etc.
 *       //expensive FTPFile objects not created until needed.
 *    }
 * 
* * The second example uses the revised FTPClient.listFiles() * API to pull the whole list from the subfolder subfolder in * one call, attempting to automatically detect the parser type. This * method, without a parserKey parameter, indicates that autodection should * be used. * *
 *    FTPClient f=FTPClient();
 *    f.connect(server);
 *    f.login(username, password);
 *    FTPFile[] files = f.listFiles("subfolder");
 * 
* * The third example uses the revised FTPClient.listFiles()> * API to pull the whole list from the current working directory in one call, * but specifying by classname the parser to be used. For this particular * parser class, this approach is necessary since there is no way to * autodetect this server type. * *
 *    FTPClient f=FTPClient();
 *    f.connect(server);
 *    f.login(username, password);
 *    FTPFile[] files = f.listFiles(
 *      "org.apache.commons.net.ftp.parser.EnterpriseUnixFTPFileEntryParser",
 *      ".");
 * 
* * The fourth example uses the revised FTPClient.listFiles() * API to pull a single file listing in an arbitrary directory in one call, * specifying by KEY the parser to be used, in this case, VMS. * *
 *    FTPClient f=FTPClient();
 *    f.connect(server);
 *    f.login(username, password);
 *    FTPFile[] files = f.listFiles("VMS", "subfolder/foo.java");
 * 
* * @author Steve Cohen * @version $Id: FTPFileEntryParser.java,v 1.19 2004/04/21 23:30:33 scohen Exp $ * @see org.apache.commons.net.ftp.FTPFile * @see org.apache.commons.net.ftp.FTPClient#createFileList */ public interface FTPFileEntryParser { /** * Parses a line of an FTP server file listing and converts it into a usable * format in the form of an FTPFile instance. If the * file listing line doesn't describe a file, null should be * returned, otherwise a FTPFile instance representing the * files in the directory is returned. *

* @param listEntry A line of text from the file listing * @return An FTPFile instance corresponding to the supplied entry */ FTPFile parseFTPEntry(String listEntry); /** * Reads the next entry using the supplied BufferedReader object up to * whatever delemits one entry from the next. Implementors must define * this for the particular ftp system being parsed. In many but not all * cases, this can be defined simply by calling BufferedReader.readLine(). * * @param reader The BufferedReader object from which entries are to be * read. * * @return A string representing the next ftp entry or null if none found. * @exception IOException thrown on any IO Error reading from the reader. */ String readNextEntry(BufferedReader reader) throws IOException; /** * This method is a hook for those implementors (such as * VMSVersioningFTPEntryParser, and possibly others) which need to * perform some action upon the FTPFileList after it has been created * from the server stream, but before any clients see the list. * * The default implementation can be a no-op. * * @param original Original list after it has been created from the server stream * * @return Original list as processed by this method. */ List preParse(List original); } /* Emacs configuration * Local variables: ** * mode: java ** * c-basic-offset: 4 ** * indent-tabs-mode: nil ** * End: ** */

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