The Commons Net FTPClientConfig.java source code
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* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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,
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* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.net.ftp;
import java.text.DateFormatSymbols;
import java.util.Collection;
import java.util.Locale;
import java.util.Map;
import java.util.StringTokenizer;
import java.util.TreeMap;
/**
* <p>
* This class implements an alternate means of configuring the
* {@link org.apache.commons.net.ftp.FTPClient FTPClient} object and
* also subordinate objects which it uses. Any class implementing the
* {@link org.apache.commons.net.ftp.Configurable Configurable }
* interface can be configured by this object.
* </p>
* In particular this class was designed primarily to support configuration
* of FTP servers which express file timestamps in formats and languages
* other than those for the US locale, which although it is the most common
* is not universal. Unfortunately, nothing in the FTP spec allows this to
* be determined in an automated way, so manual configuration such as this
* is necessary.
* </p>
* This functionality was designed to allow existing clients to work exactly
* as before without requiring use of this component. This component should
* only need to be explicitly invoked by the user of this package for problem
* cases that previous implementations could not solve.
* </p>
* <h3>Examples of use of FTPClientConfig
* Use cases:
* You are trying to access a server that
* <ul>
* <li>lists files with timestamps that use month names in languages other
* than English</li>
* <li>lists files with timestamps that use date formats other
* than the American English "standard" <code>MM dd yyyy
* <li>is in different timezone and you need accurate timestamps for
* dependency checking as in Ant</li>
* </ul>
* <p>
* Unpaged (whole list) access on a UNIX server that uses French month names
* but uses the "standard" <code>MMM d yyyy date formatting
* <pre>
* FTPClient f=FTPClient();
* FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_UNIX);
* conf.setServerLanguageCode("fr");
* f.configure(conf);
* f.connect(server);
* f.login(username, password);
* FTPFile[] files = listFiles(directory);
* </pre>
* </p>
* <p>
* Paged access on a UNIX server that uses Danish month names
* and "European" date formatting in Denmark's time zone, when you
* are in some other time zone.
* <pre>
* FTPClient f=FTPClient();
* FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_UNIX);
* conf.setServerLanguageCode("da");
* conf.setDefaultDateFormat("d MMM yyyy");
* conf.setRecentDateFormat("d MMM HH:mm");
* conf.setTimeZoneId("Europe/Copenhagen");
* f.configure(conf);
* f.connect(server);
* f.login(username, password);
* FTPListParseEngine engine =
* f.initiateListParsing("com.whatever.YourOwnParser", 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>
* <p>
* Unpaged (whole list) access on a VMS server that uses month names
* in a language not {@link #getSupportedLanguageCodes() supported} by the system.
* but uses the "standard" <code>MMM d yyyy date formatting
* <pre>
* FTPClient f=FTPClient();
* FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_VMS);
* conf.setShortMonthNames(
* "jan|feb|mar|apr|ma\u00ED|j\u00FAn|j\u00FAl|\u00e1g\u00FA|sep|okt|n\u00F3v|des");
* f.configure(conf);
* f.connect(server);
* f.login(username, password);
* FTPFile[] files = listFiles(directory);
* </pre>
* </p>
* <p>
* Unpaged (whole list) access on a Windows-NT server in a different time zone.
* (Note, since the NT Format uses numeric date formatting, language issues
* are irrelevant here).
* <pre>
* FTPClient f=FTPClient();
* FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_NT);
* conf.setTimeZoneId("America/Denver");
* f.configure(conf);
* f.connect(server);
* f.login(username, password);
* FTPFile[] files = listFiles(directory);
* </pre>
* </p>
* Unpaged (whole list) access on a Windows-NT server in a different time zone
* but which has been configured to use a unix-style listing format.
* <pre>
* FTPClient f=FTPClient();
* FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_UNIX);
* conf.setTimeZoneId("America/Denver");
* f.configure(conf);
* f.connect(server);
* f.login(username, password);
* FTPFile[] files = listFiles(directory);
* </pre>
* </p>
* @since 1.4
* @see org.apache.commons.net.ftp.Configurable
* @see org.apache.commons.net.ftp.FTPClient
* @see org.apache.commons.net.ftp.parser.FTPTimestampParserImpl#configure(FTPClientConfig)
* @see org.apache.commons.net.ftp.parser.ConfigurableFTPFileEntryParserImpl
*/
public class FTPClientConfig
{
/**
* Identifier by which a unix-based ftp server is known throughout
* the commons-net ftp system.
*/
public static final String SYST_UNIX = "UNIX";
/**
* Identifier by which a vms-based ftp server is known throughout
* the commons-net ftp system.
*/
public static final String SYST_VMS = "VMS";
/**
* Identifier by which a WindowsNT-based ftp server is known throughout
* the commons-net ftp system.
*/
public static final String SYST_NT = "WINDOWS";
/**
* Identifier by which an OS/2-based ftp server is known throughout
* the commons-net ftp system.
*/
public static final String SYST_OS2 = "OS/2";
/**
* Identifier by which an OS/400-based ftp server is known throughout
* the commons-net ftp system.
*/
public static final String SYST_OS400 = "OS/400";
/**
* Identifier by which an AS/400-based ftp server is known throughout
* the commons-net ftp system.
*/
public static final String SYST_AS400 = "AS/400";
/**
* Identifier by which an MVS-based ftp server is known throughout
* the commons-net ftp system.
*/
public static final String SYST_MVS = "MVS";
/**
* Some servers return an "UNKNOWN Type: L8" message
* in response to the SYST command. We set these to be a Unix-type system.
* This may happen if the ftpd in question was compiled without system
* information.
*
* NET-230 - Updated to be UPPERCASE so that the check done in
* createFileEntryParser will succeed.
*
* @since 1.5
*/
public static final String SYST_L8 = "TYPE: L8";
/**
* Identifier by which an Netware-based ftp server is known throughout
* the commons-net ftp system.
*
* @since 1.5
*/
public static final String SYST_NETWARE = "NETWARE";
private final String serverSystemKey;
private String defaultDateFormatStr = null;
private String recentDateFormatStr = null;
private boolean lenientFutureDates = true; // NET-407
private String serverLanguageCode = null;
private String shortMonthNames = null;
private String serverTimeZoneId = null;
/**
* The main constructor for an FTPClientConfig object
* @param systemKey key representing system type of the server being
* connected to. See {@link #getServerSystemKey() serverSystemKey}
*/
public FTPClientConfig(String systemKey) {
this.serverSystemKey = systemKey;
}
/**
* Convenience constructor mainly for use in testing.
* Constructs a UNIX configuration.
*/
public FTPClientConfig() {
this(SYST_UNIX);
}
/**
* Constructor which allows setting of all member fields
* @param systemKey key representing system type of the server being
* connected to. See
* {@link #getServerSystemKey() serverSystemKey}
* @param defaultDateFormatStr See
* {@link #setDefaultDateFormatStr(String) defaultDateFormatStr}
* @param recentDateFormatStr See
* {@link #setRecentDateFormatStr(String) recentDateFormatStr}
* @param serverLanguageCode See
* {@link #setServerLanguageCode(String) serverLanguageCode}
* @param shortMonthNames See
* {@link #setShortMonthNames(String) shortMonthNames}
* @param serverTimeZoneId See
* {@link #setServerTimeZoneId(String) serverTimeZoneId}
*/
public FTPClientConfig(String systemKey,
String defaultDateFormatStr,
String recentDateFormatStr,
String serverLanguageCode,
String shortMonthNames,
String serverTimeZoneId)
{
this(systemKey);
this.defaultDateFormatStr = defaultDateFormatStr;
this.recentDateFormatStr = recentDateFormatStr;
this.serverLanguageCode = serverLanguageCode;
this.shortMonthNames = shortMonthNames;
this.serverTimeZoneId = serverTimeZoneId;
}
private static final Map<String, Object> LANGUAGE_CODE_MAP = new TreeMap();
static {
// if there are other commonly used month name encodings which
// correspond to particular locales, please add them here.
// many locales code short names for months as all three letters
// these we handle simply.
LANGUAGE_CODE_MAP.put("en", Locale.ENGLISH);
LANGUAGE_CODE_MAP.put("de",Locale.GERMAN);
LANGUAGE_CODE_MAP.put("it",Locale.ITALIAN);
LANGUAGE_CODE_MAP.put("es", new Locale("es", "", "")); // spanish
LANGUAGE_CODE_MAP.put("pt", new Locale("pt", "", "")); // portuguese
LANGUAGE_CODE_MAP.put("da", new Locale("da", "", "")); // danish
LANGUAGE_CODE_MAP.put("sv", new Locale("sv", "", "")); // swedish
LANGUAGE_CODE_MAP.put("no", new Locale("no", "", "")); // norwegian
LANGUAGE_CODE_MAP.put("nl", new Locale("nl", "", "")); // dutch
LANGUAGE_CODE_MAP.put("ro", new Locale("ro", "", "")); // romanian
LANGUAGE_CODE_MAP.put("sq", new Locale("sq", "", "")); // albanian
LANGUAGE_CODE_MAP.put("sh", new Locale("sh", "", "")); // serbo-croatian
LANGUAGE_CODE_MAP.put("sk", new Locale("sk", "", "")); // slovak
LANGUAGE_CODE_MAP.put("sl", new Locale("sl", "", "")); // slovenian
// some don't
LANGUAGE_CODE_MAP.put("fr",
"jan|f\u00e9v|mar|avr|mai|jun|jui|ao\u00fb|sep|oct|nov|d\u00e9c"); //french
}
/**
* Getter for the serverSystemKey property. This property
* specifies the general type of server to which the client connects.
* Should be either one of the <code>FTPClientConfig.SYST_* codes
* or else the fully qualified class name of a parser implementing both
* the <code>FTPFileEntryParser and Configurable
* interfaces.
* @return Returns the serverSystemKey property.
*/
public String getServerSystemKey() {
return serverSystemKey;
}
/**
* getter for the {@link #setDefaultDateFormatStr(String) defaultDateFormatStr}
* property.
* @return Returns the defaultDateFormatStr property.
*/
public String getDefaultDateFormatStr() {
return defaultDateFormatStr;
}
/**
* getter for the {@link #setRecentDateFormatStr(String) recentDateFormatStr} property.
* @return Returns the recentDateFormatStr property.
*/
public String getRecentDateFormatStr() {
return recentDateFormatStr;
}
/**
* getter for the {@link #setServerTimeZoneId(String) serverTimeZoneId} property.
* @return Returns the serverTimeZoneId property.
*/
public String getServerTimeZoneId() {
return serverTimeZoneId;
}
/**
* <p>
* getter for the {@link #setShortMonthNames(String) shortMonthNames}
* property.
* </p>
* @return Returns the shortMonthNames.
*/
public String getShortMonthNames() {
return shortMonthNames;
}
/**
* <p>
* getter for the {@link #setServerLanguageCode(String) serverLanguageCode} property.
* </p>
* @return Returns the serverLanguageCode property.
*/
public String getServerLanguageCode() {
return serverLanguageCode;
}
/**
* <p>
* getter for the {@link #setLenientFutureDates(boolean) lenientFutureDates} property.
* </p>
* @return Returns the lenientFutureDates.
* @since 1.5
*/
public boolean isLenientFutureDates() {
return lenientFutureDates;
}
/**
* <p>
* setter for the defaultDateFormatStr property. This property
* specifies the main date format that will be used by a parser configured
* by this configuration to parse file timestamps. If this is not
* specified, such a parser will use as a default value, the most commonly
* used format which will be in as used in <code>en_US locales.
* </p>
* This should be in the format described for
* <code>java.text.SimpleDateFormat.
* property.
* </p>
* @param defaultDateFormatStr The defaultDateFormatStr to set.
*/
public void setDefaultDateFormatStr(String defaultDateFormatStr) {
this.defaultDateFormatStr = defaultDateFormatStr;
}
/**
* <p>
* setter for the recentDateFormatStr property. This property
* specifies a secondary date format that will be used by a parser
* configured by this configuration to parse file timestamps, typically
* those less than a year old. If this is not specified, such a parser
* will not attempt to parse using an alternate format.
* </p>
* This is used primarily in unix-based systems.
* </p>
* This should be in the format described for
* <code>java.text.SimpleDateFormat.
* </p>
* @param recentDateFormatStr The recentDateFormatStr to set.
*/
public void setRecentDateFormatStr(String recentDateFormatStr) {
this.recentDateFormatStr = recentDateFormatStr;
}
/**
* <p>
* setter for the lenientFutureDates property. This boolean property
* (default: false) only has meaning when a
* {@link #setRecentDateFormatStr(String) recentDateFormatStr} property
* has been set. In that case, if this property is set true, then the
* parser, when it encounters a listing parseable with the recent date
* format, will only consider a date to belong to the previous year if
* it is more than one day in the future. This will allow all
* out-of-synch situations (whether based on "slop" - i.e. servers simply
* out of synch with one another or because of time zone differences -
* but in the latter case it is highly recommended to use the
* {@link #setServerTimeZoneId(String) serverTimeZoneId} property
* instead) to resolve correctly.
* </p>
* This is used primarily in unix-based systems.
* </p>
* @param lenientFutureDates set true to compensate for out-of-synch
* conditions.
*/
public void setLenientFutureDates(boolean lenientFutureDates) {
this.lenientFutureDates = lenientFutureDates;
}
/**
* <p>
* setter for the serverTimeZoneId property. This property
* allows a time zone to be specified corresponding to that known to be
* used by an FTP server in file listings. This might be particularly
* useful to clients such as Ant that try to use these timestamps for
* dependency checking.
* </p>
* This should be one of the identifiers used by
* <code>java.util.TimeZone to refer to time zones, for example,
* <code>America/Chicago or Asia/Rangoon.
* </p>
* @param serverTimeZoneId The serverTimeZoneId to set.
*/
public void setServerTimeZoneId(String serverTimeZoneId) {
this.serverTimeZoneId = serverTimeZoneId;
}
/**
* <p>
* setter for the shortMonthNames property.
* This property allows the user to specify a set of month names
* used by the server that is different from those that may be
* specified using the {@link #setServerLanguageCode(String) serverLanguageCode}
* property.
* </p>
* This should be a string containing twelve strings each composed of
* three characters, delimited by pipe (|) characters. Currently,
* only 8-bit ASCII characters are known to be supported. For example,
* a set of month names used by a hypothetical Icelandic FTP server might
* conceivably be specified as
* <code>"jan|feb|mar|apr|maí|jún|júl|ágú|sep|okt|nóv|des".
* </p>
* @param shortMonthNames The value to set to the shortMonthNames property.
*/
public void setShortMonthNames(String shortMonthNames) {
this.shortMonthNames = shortMonthNames;
}
/**
* <p>
* setter for the serverLanguageCode property. This property allows
* user to specify a
* <a href="http://www.ics.uci.edu/pub/ietf/http/related/iso639.txt">
* two-letter ISO-639 language code</a> that will be used to
* configure the set of month names used by the file timestamp parser.
* If neither this nor the {@link #setShortMonthNames(String) shortMonthNames}
* is specified, parsing will assume English month names, which may or
* may not be significant, depending on whether the date format(s)
* specified via {@link #setDefaultDateFormatStr(String) defaultDateFormatStr}
* and/or {@link #setRecentDateFormatStr(String) recentDateFormatStr} are using
* numeric or alphabetic month names.
* </p>
* <p>If the code supplied is not supported here, en_US
* month names will be used. We are supporting here those language
* codes which, when a <code> java.util.Locale is constucted
* using it, and a <code>java.text.SimpleDateFormat is
* constructed using that Locale, the array returned by the
* SimpleDateFormat's <code>getShortMonths() method consists
* solely of three 8-bit ASCII character strings. Additionally,
* languages which do not meet this requirement are included if a
* common alternative set of short month names is known to be used.
* This means that users who can tell us of additional such encodings
* may get them added to the list of supported languages by contacting
* the Apache Commons Net team.
* </p>
* <p>
* Please note that this attribute will NOT be used to determine a
* locale-based date format for the language. </strong>
* Experience has shown that many if not most FTP servers outside the
* United States employ the standard <code>en_US date format
* orderings of <code>MMM d yyyy and MMM d HH:mm
* and attempting to deduce this automatically here would cause more
* problems than it would solve. The date format must be changed
* via the {@link #setDefaultDateFormatStr(String) defaultDateFormatStr} and/or
* {@link #setRecentDateFormatStr(String) recentDateFormatStr} parameters.
* </p>
* @param serverLanguageCode The value to set to the serverLanguageCode property.
*/
public void setServerLanguageCode(String serverLanguageCode) {
this.serverLanguageCode = serverLanguageCode;
}
/**
* Looks up the supplied language code in the internally maintained table of
* language codes. Returns a DateFormatSymbols object configured with
* short month names corresponding to the code. If there is no corresponding
* entry in the table, the object returned will be that for
* <code>Locale.US
* @param languageCode See {@link #setServerLanguageCode(String) serverLanguageCode}
* @return a DateFormatSymbols object configured with short month names
* corresponding to the supplied code, or with month names for
* <code>Locale.US if there is no corresponding entry in the internal
* table.
*/
public static DateFormatSymbols lookupDateFormatSymbols(String languageCode)
{
Object lang = LANGUAGE_CODE_MAP.get(languageCode);
if (lang != null) {
if (lang instanceof Locale) {
return new DateFormatSymbols((Locale) lang);
} else if (lang instanceof String){
return getDateFormatSymbols((String) lang);
}
}
return new DateFormatSymbols(Locale.US);
}
/**
* Returns a DateFormatSymbols object configured with short month names
* as in the supplied string
* @param shortmonths This should be as described in
* {@link #setShortMonthNames(String) shortMonthNames}
* @return a DateFormatSymbols object configured with short month names
* as in the supplied string
*/
public static DateFormatSymbols getDateFormatSymbols(String shortmonths)
{
String[] months = splitShortMonthString(shortmonths);
DateFormatSymbols dfs = new DateFormatSymbols(Locale.US);
dfs.setShortMonths(months);
return dfs;
}
private static String[] splitShortMonthString(String shortmonths) {
StringTokenizer st = new StringTokenizer(shortmonths, "|");
int monthcnt = st.countTokens();
if (12 != monthcnt) {
throw new IllegalArgumentException(
"expecting a pipe-delimited string containing 12 tokens");
}
String[] months = new String[13];
int pos = 0;
while(st.hasMoreTokens()) {
months[pos++] = st.nextToken();
}
months[pos]="";
return months;
}
/**
* Returns a Collection of all the language codes currently supported
* by this class. See {@link #setServerLanguageCode(String) serverLanguageCode}
* for a functional descrption of language codes within this system.
*
* @return a Collection of all the language codes currently supported
* by this class
*/
public static Collection<String> getSupportedLanguageCodes() {
return LANGUAGE_CODE_MAP.keySet();
}
}
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