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commons-net-1.4.1.jar - Apache Commons Net
commons-net-1.4.1.jar is the JAR file for Apache Commons Net 1.4.1, which
implements the client side of many basic Internet protocols.
commons-net-1.4.1.jar is distributed as part of the commons-net-1.4.1.zip download file.
JAR File Size and Download Location:
JAR name: commons-net.jar, commons-net-1.4.1.jar Target JDK version: 1.4 Dependency: None File name: commons-net-1.4.1.jar File size: 180792 bytes Date modified: 03-Dec-2005 Download: Apache Commons Net
✍: FYIcenter.com
⏎ org/apache/commons/net/ftp/FTPListParseEngine.java
/* * Copyright 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.io.InputStream; import java.io.InputStreamReader; import java.util.Iterator; import java.util.LinkedList; import java.util.List; import java.util.ListIterator; /** * This class handles the entire process of parsing a listing of * file entries from the server. * <p> * This object defines a two-part parsing mechanism. * <p> * The first part is comprised of reading the raw input into an internal * list of strings. Every item in this list corresponds to an actual * file. All extraneous matter emitted by the server will have been * removed by the end of this phase. This is accomplished in conjunction * with the FTPFileEntryParser associated with this engine, by calling * its methods <code>readNextEntry()</code> - which handles the issue of * what delimits one entry from another, usually but not always a line * feed and <code>preParse()</code> - which handles removal of * extraneous matter such as the preliminary lines of a listing, removal * of duplicates on versioning systems, etc. * <p> * The second part is composed of the actual parsing, again in conjunction * with the particular parser used by this engine. This is controlled * by an iterator over the internal list of strings. This may be done * either in block mode, by calling the <code>getNext()</code> and * <code>getPrevious()</code> methods to provide "paged" output of less * than the whole list at one time, or by calling the * <code>getFiles()</code> method to return the entire list. * <p> * Examples: * <p> * Paged access: * <pre> * FTPClient f=FTPClient(); * f.connect(server); * f.login(username, password); * FTPListParseEngine engine = f.initiateListParsing(directory); * * while (engine.hasNext()) { * FTPFile[] files = engine.getNext(25); // "page size" you want * //do whatever you want with these files, display them, etc. * //expensive FTPFile objects not created until needed. * } * </pre> * <p> * For unpaged access, simply use FTPClient.listFiles(). That method * uses this class transparently. * @version $Id: FTPListParseEngine.java 155429 2005-02-26 13:13:04Z dirkv $ */ public class FTPListParseEngine { private List entries = new LinkedList(); private ListIterator _internalIterator = entries.listIterator(); FTPFileEntryParser parser = null; public FTPListParseEngine(FTPFileEntryParser parser) { this.parser = parser; } /** * handle the iniitial reading and preparsing of the list returned by * the server. After this method has completed, this object will contain * a list of unparsed entries (Strings) each referring to a unique file * on the server. * * @param stream input stream provided by the server socket. * * @exception IOException * thrown on any failure to read from the sever. */ public void readServerList(InputStream stream, String encoding) throws IOException { this.entries = new LinkedList(); readStream(stream, encoding); this.parser.preParse(this.entries); resetIterator(); } /** * handle the iniitial reading and preparsing of the list returned by * the server. After this method has completed, this object will contain * a list of unparsed entries (Strings) each referring to a unique file * on the server. * * @param stream input stream provided by the server socket. * * @exception IOException * thrown on any failure to read from the sever. * * @deprecated The version of this method which takes an encoding should be used. */ public void readServerList(InputStream stream) throws IOException { readServerList(stream, null); } /** * Internal method for reading the input into the <code>entries</code> list. * After this method has completed, <code>entries</code> will contain a * collection of entries (as defined by * <code>FTPFileEntryParser.readNextEntry()</code>), but this may contain * various non-entry preliminary lines from the server output, duplicates, * and other data that will not be part of the final listing. * * @param stream The socket stream on which the input will be read. * @param encoding The encoding to use. * * @exception IOException * thrown on any failure to read the stream */ private void readStream(InputStream stream, String encoding) throws IOException { BufferedReader reader; if (encoding == null) { reader = new BufferedReader(new InputStreamReader(stream)); } else { reader = new BufferedReader(new InputStreamReader(stream, encoding)); } String line = this.parser.readNextEntry(reader); while (line != null) { this.entries.add(line); line = this.parser.readNextEntry(reader); } reader.close(); } /** * Returns an array of at most <code>quantityRequested</code> FTPFile * objects starting at this object's internal iterator's current position. * If fewer than <code>quantityRequested</code> such * elements are available, the returned array will have a length equal * to the number of entries at and after after the current position. * If no such entries are found, this array will have a length of 0. * * After this method is called this object's internal iterator is advanced * by a number of positions equal to the size of the array returned. * * @param quantityRequested * the maximum number of entries we want to get. * * @return an array of at most <code>quantityRequested</code> FTPFile * objects starting at the current position of this iterator within its * list and at least the number of elements which exist in the list at * and after its current position. * <p><b> * NOTE:</b> This array may contain null members if any of the * individual file listings failed to parse. The caller should * check each entry for null before referencing it. */ public FTPFile[] getNext(int quantityRequested) { List tmpResults = new LinkedList(); int count = quantityRequested; while (count > 0 && this._internalIterator.hasNext()) { String entry = (String) this._internalIterator.next(); FTPFile temp = this.parser.parseFTPEntry(entry); tmpResults.add(temp); count--; } return (FTPFile[]) tmpResults.toArray(new FTPFile[0]); } /** * Returns an array of at most <code>quantityRequested</code> FTPFile * objects starting at this object's internal iterator's current position, * and working back toward the beginning. * * If fewer than <code>quantityRequested</code> such * elements are available, the returned array will have a length equal * to the number of entries at and after after the current position. * If no such entries are found, this array will have a length of 0. * * After this method is called this object's internal iterator is moved * back by a number of positions equal to the size of the array returned. * * @param quantityRequested * the maximum number of entries we want to get. * * @return an array of at most <code>quantityRequested</code> FTPFile * objects starting at the current position of this iterator within its * list and at least the number of elements which exist in the list at * and after its current position. This array will be in the same order * as the underlying list (not reversed). * <p><b> * NOTE:</b> This array may contain null members if any of the * individual file listings failed to parse. The caller should * check each entry for null before referencing it. */ public FTPFile[] getPrevious(int quantityRequested) { List tmpResults = new LinkedList(); int count = quantityRequested; while (count > 0 && this._internalIterator.hasPrevious()) { String entry = (String) this._internalIterator.previous(); FTPFile temp = this.parser.parseFTPEntry(entry); tmpResults.add(0,temp); count--; } return (FTPFile[]) tmpResults.toArray(new FTPFile[0]); } /** * Returns an array of FTPFile objects containing the whole list of * files returned by the server as read by this object's parser. * * @return an array of FTPFile objects containing the whole list of * files returned by the server as read by this object's parser. * <p><b> * NOTE:</b> This array may contain null members if any of the * individual file listings failed to parse. The caller should * check each entry for null before referencing it. * @exception IOException */ public FTPFile[] getFiles() throws IOException { List tmpResults = new LinkedList(); Iterator iter = this.entries.iterator(); while (iter.hasNext()) { String entry = (String) iter.next(); FTPFile temp = this.parser.parseFTPEntry(entry); tmpResults.add(temp); } return (FTPFile[]) tmpResults.toArray(new FTPFile[0]); } /** * convenience method to allow clients to know whether this object's * internal iterator's current position is at the end of the list. * * @return true if internal iterator is not at end of list, false * otherwise. */ public boolean hasNext() { return _internalIterator.hasNext(); } /** * convenience method to allow clients to know whether this object's * internal iterator's current position is at the beginning of the list. * * @return true if internal iterator is not at beginning of list, false * otherwise. */ public boolean hasPrevious() { return _internalIterator.hasPrevious(); } /** * resets this object's internal iterator to the beginning of the list. */ public void resetIterator() { this._internalIterator = this.entries.listIterator(); } }
⏎ org/apache/commons/net/ftp/FTPListParseEngine.java
Or download all of them as a single archive file:
File name: commons-net-1.4.1-src.zip File size: 324370 bytes Release date: 2013-03-03 Download
⇒ Using commons-net.jar in Java Programs
⇐ What Is commons-net-ftp-2.0.jar
2015-06-03, 56437👍, 0💬
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