//plasmaCrawlRobotsTxt.java
//-------------------------------------
//part of YACY
//(C) by Michael Peter Christen; mc@yacy.net
//first published on http://www.anomic.de
//Frankfurt, Germany, 2004
//
//This file is contributed by Martin Thelian
// [MC] moved some methods from robotsParser file that had been created by Alexander Schier to this class
//last major change: $LastChangedDate$ by $LastChangedBy$
//Revision: $LastChangedRevision$
//
//This program is free software; you can redistribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation; either version 2 of the License, or
//(at your option) any later version.
//
//This program is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
//GNU General Public License for more details.
//
//You should have received a copy of the GNU General Public License
//along with this program; if not, write to the Free Software
//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package de.anomic.crawler ;
import java.io.BufferedInputStream ;
import java.io.BufferedOutputStream ;
import java.io.File ;
import java.io.IOException ;
import java.net.MalformedURLException ;
import java.util.ArrayList ;
import java.util.Arrays ;
import java.util.Date ;
import java.util.HashMap ;
import java.util.Iterator ;
import java.util.LinkedList ;
import java.util.Map ;
import java.util.concurrent.ConcurrentHashMap ;
import de.anomic.http.httpClient ;
import de.anomic.http.httpResponse ;
import de.anomic.http.httpRequestHeader ;
import de.anomic.kelondro.blob.BLOBHeap ;
import de.anomic.kelondro.blob.MapView ;
import de.anomic.kelondro.order.NaturalOrder ;
import de.anomic.kelondro.util.ByteBuffer ;
import de.anomic.kelondro.util.DateFormatter ;
import de.anomic.kelondro.util.kelondroException ;
import de.anomic.kelondro.util.FileUtils ;
import de.anomic.yacy.yacyURL ;
import de.anomic.yacy.logging.Log ;
public class RobotsTxt {
public static final String ROBOTS_DB_PATH_SEPARATOR = ";" ;
private static final Log log = new Log ( "ROBOTS" ) ;
MapView robotsTable ;
private final File robotsTableFile ;
private final ConcurrentHashMap < String , DomSync > syncObjects ;
//private static final HashSet<String> loadedRobots = new HashSet<String>(); // only for debugging
private static class DomSync {
public DomSync ( ) { }
}
public RobotsTxt ( final File robotsTableFile ) {
this . robotsTableFile = robotsTableFile ;
robotsTableFile . getParentFile ( ) . mkdirs ( ) ;
BLOBHeap blob = null ;
try {
blob = new BLOBHeap ( robotsTableFile , 64 , NaturalOrder . naturalOrder , 1024 * 1024 ) ;
} catch ( final IOException e ) {
e . printStackTrace ( ) ;
}
robotsTable = new MapView ( blob , 100 , '_' ) ;
syncObjects = new ConcurrentHashMap < String , DomSync > ( ) ;
}
private void resetDatabase ( ) {
// deletes the robots.txt database and creates a new one
if ( robotsTable ! = null ) robotsTable . close ( ) ;
FileUtils . deletedelete ( robotsTableFile ) ;
robotsTableFile . getParentFile ( ) . mkdirs ( ) ;
BLOBHeap blob = null ;
try {
blob = new BLOBHeap ( robotsTableFile , 64 , NaturalOrder . naturalOrder , 1024 * 1024 ) ;
} catch ( final IOException e ) {
e . printStackTrace ( ) ;
}
robotsTable = new MapView ( blob , 100 , '_' ) ;
syncObjects . clear ( ) ;
}
public void clear ( ) throws IOException {
this . robotsTable . clear ( ) ;
}
public void close ( ) {
this . robotsTable . close ( ) ;
}
public int size ( ) {
return this . robotsTable . size ( ) ;
}
private Entry getEntry ( final String urlHostPort , final boolean fetchOnlineIfNotAvailableOrNotFresh ) {
// this method will always return a non-null value
Entry robotsTxt4Host = null ;
try {
final Map < String , String > record = this . robotsTable . get ( urlHostPort ) ;
if ( record ! = null ) robotsTxt4Host = new Entry ( urlHostPort , record ) ;
} catch ( final kelondroException e ) {
resetDatabase ( ) ;
} catch ( final IOException e ) {
resetDatabase ( ) ;
}
if ( fetchOnlineIfNotAvailableOrNotFresh & & (
robotsTxt4Host = = null | |
robotsTxt4Host . getLoadedDate ( ) = = null | |
System . currentTimeMillis ( ) - robotsTxt4Host . getLoadedDate ( ) . getTime ( ) > 7 * 24 * 60 * 60 * 1000
) ) {
// make or get a synchronization object
DomSync syncObj = this . syncObjects . get ( urlHostPort ) ;
if ( syncObj = = null ) {
syncObj = new DomSync ( ) ;
this . syncObjects . put ( urlHostPort , syncObj ) ;
}
// we can now synchronize for each host separately
synchronized ( syncObj ) {
// if we have not found any data or the data is older than 7 days, we need to load it from the remote server
// check the robots table again for all threads that come here because they waited for another one
// to complete a download
try {
final Map < String , String > record = this . robotsTable . get ( urlHostPort ) ;
if ( record ! = null ) robotsTxt4Host = new Entry ( urlHostPort , record ) ;
} catch ( final kelondroException e ) {
resetDatabase ( ) ;
} catch ( final IOException e ) {
resetDatabase ( ) ;
}
if ( robotsTxt4Host ! = null & &
robotsTxt4Host . getLoadedDate ( ) ! = null & &
System . currentTimeMillis ( ) - robotsTxt4Host . getLoadedDate ( ) . getTime ( ) < = 1 * 24 * 60 * 60 * 1000 ) {
return robotsTxt4Host ;
}
// generating the proper url to download the robots txt
yacyURL robotsURL = null ;
try {
robotsURL = new yacyURL ( "http://" + urlHostPort + "/robots.txt" , null ) ;
} catch ( final MalformedURLException e ) {
log . logSevere ( "Unable to generate robots.txt URL for host:port '" + urlHostPort + "'." ) ;
robotsURL = null ;
}
Object [ ] result = null ;
if ( robotsURL ! = null ) {
if ( log . isFine ( ) ) log . logFine ( "Trying to download the robots.txt file from URL '" + robotsURL + "'." ) ;
try {
result = downloadRobotsTxt ( robotsURL , 5 , robotsTxt4Host ) ;
} catch ( final Exception e ) {
result = null ;
}
}
/ *
assert ! loadedRobots . contains ( robotsURL . toNormalform ( false , false ) ) :
"robots-url=" + robotsURL . toString ( ) +
", robots=" + ( ( result = = null | | result [ DOWNLOAD_ROBOTS_TXT ] = = null ) ? "NULL" : new String ( ( byte [ ] ) result [ DOWNLOAD_ROBOTS_TXT ] ) ) +
", robotsTxt4Host=" + ( ( robotsTxt4Host = = null ) ? "NULL" : robotsTxt4Host . getLoadedDate ( ) . toString ( ) ) ;
loadedRobots . add ( robotsURL . toNormalform ( false , false ) ) ;
* /
if ( result = = null ) {
// no robots.txt available, make an entry to prevent that the robots loading is done twice
if ( robotsTxt4Host = = null ) {
// generate artificial entry
robotsTxt4Host = new Entry (
urlHostPort ,
new ArrayList < String > ( ) ,
new ArrayList < String > ( ) ,
new Date ( ) ,
new Date ( ) ,
null ,
null ,
Integer . valueOf ( 0 ) ) ;
} else {
robotsTxt4Host . setLoadedDate ( new Date ( ) ) ;
}
// store the data into the robots DB
int sz = this . robotsTable . size ( ) ;
addEntry ( robotsTxt4Host ) ;
if ( this . robotsTable . size ( ) < = sz ) {
Log . logSevere ( "RobotsTxt" , "new entry in robots.txt table failed, reseing database" ) ;
this . resetDatabase ( ) ;
addEntry ( robotsTxt4Host ) ;
}
} else {
final robotsParser parserResult = new robotsParser ( ( byte [ ] ) result [ DOWNLOAD_ROBOTS_TXT ] ) ;
ArrayList < String > denyPath = parserResult . denyList ( ) ;
if ( ( ( Boolean ) result [ DOWNLOAD_ACCESS_RESTRICTED ] ) . booleanValue ( ) ) {
denyPath = new ArrayList < String > ( ) ;
denyPath . add ( "/" ) ;
}
// store the data into the robots DB
robotsTxt4Host = addEntry (
urlHostPort ,
parserResult . allowList ( ) ,
denyPath ,
new Date ( ) ,
( Date ) result [ DOWNLOAD_MODDATE ] ,
( String ) result [ DOWNLOAD_ETAG ] ,
parserResult . sitemap ( ) ,
parserResult . crawlDelayMillis ( ) ) ;
}
}
}
return robotsTxt4Host ;
}
public long crawlDelayMillis ( final yacyURL theURL ) {
final String urlHostPort = getHostPort ( theURL ) ;
final RobotsTxt . Entry robotsEntry = getEntry ( urlHostPort , true ) ;
return robotsEntry . getCrawlDelayMillis ( ) ;
}
private Entry addEntry (
final String hostName ,
final ArrayList < String > allowPathList ,
final ArrayList < String > denyPathList ,
final Date loadedDate ,
final Date modDate ,
final String eTag ,
final String sitemap ,
final long crawlDelayMillis
) {
final Entry entry = new Entry (
hostName , allowPathList , denyPathList , loadedDate , modDate ,
eTag , sitemap , crawlDelayMillis ) ;
addEntry ( entry ) ;
return entry ;
}
private String addEntry ( final Entry entry ) {
// writes a new page and returns key
try {
this . robotsTable . put ( entry . hostName , entry . mem ) ;
return entry . hostName ;
} catch ( final IOException e ) {
return null ;
}
}
public static class Entry {
public static final String ALLOW_PATH_LIST = "allow" ;
public static final String DISALLOW_PATH_LIST = "disallow" ;
public static final String LOADED_DATE = "date" ;
public static final String MOD_DATE = "modDate" ;
public static final String ETAG = "etag" ;
public static final String SITEMAP = "sitemap" ;
public static final String CRAWL_DELAY = "crawlDelay" ;
public static final String CRAWL_DELAY_MILLIS = "crawlDelayMillis" ;
// this is a simple record structure that holds all properties of a single crawl start
Map < String , String > mem ;
private LinkedList < String > allowPathList , denyPathList ;
String hostName ;
public Entry ( final String hostName , final Map < String , String > mem ) {
this . hostName = hostName . toLowerCase ( ) ;
this . mem = mem ;
if ( this . mem . containsKey ( DISALLOW_PATH_LIST ) ) {
this . denyPathList = new LinkedList < String > ( ) ;
final String csPl = this . mem . get ( DISALLOW_PATH_LIST ) ;
if ( csPl . length ( ) > 0 ) {
final String [ ] pathArray = csPl . split ( ROBOTS_DB_PATH_SEPARATOR ) ;
if ( ( pathArray ! = null ) & & ( pathArray . length > 0 ) ) {
this . denyPathList . addAll ( Arrays . asList ( pathArray ) ) ;
}
}
} else {
this . denyPathList = new LinkedList < String > ( ) ;
}
if ( this . mem . containsKey ( ALLOW_PATH_LIST ) ) {
this . allowPathList = new LinkedList < String > ( ) ;
final String csPl = this . mem . get ( ALLOW_PATH_LIST ) ;
if ( csPl . length ( ) > 0 ) {
final String [ ] pathArray = csPl . split ( ROBOTS_DB_PATH_SEPARATOR ) ;
if ( ( pathArray ! = null ) & & ( pathArray . length > 0 ) ) {
this . allowPathList . addAll ( Arrays . asList ( pathArray ) ) ;
}
}
} else {
this . allowPathList = new LinkedList < String > ( ) ;
}
}
public Entry (
final String hostName ,
final ArrayList < String > allowPathList ,
final ArrayList < String > disallowPathList ,
final Date loadedDate ,
final Date modDate ,
final String eTag ,
final String sitemap ,
final long crawlDelayMillis
) {
if ( ( hostName = = null ) | | ( hostName . length ( ) = = 0 ) ) throw new IllegalArgumentException ( "The hostname is missing" ) ;
this . hostName = hostName . trim ( ) . toLowerCase ( ) ;
this . allowPathList = new LinkedList < String > ( ) ;
this . denyPathList = new LinkedList < String > ( ) ;
this . mem = new HashMap < String , String > ( 5 ) ;
if ( loadedDate ! = null ) this . mem . put ( LOADED_DATE , Long . toString ( loadedDate . getTime ( ) ) ) ;
if ( modDate ! = null ) this . mem . put ( MOD_DATE , Long . toString ( modDate . getTime ( ) ) ) ;
if ( eTag ! = null ) this . mem . put ( ETAG , eTag ) ;
if ( sitemap ! = null ) this . mem . put ( SITEMAP , sitemap ) ;
if ( crawlDelayMillis > 0 ) this . mem . put ( CRAWL_DELAY_MILLIS , Long . toString ( crawlDelayMillis ) ) ;
if ( ( allowPathList ! = null ) & & ( allowPathList . size ( ) > 0 ) ) {
this . allowPathList . addAll ( allowPathList ) ;
final StringBuilder pathListStr = new StringBuilder ( ) ;
for ( int i = 0 ; i < allowPathList . size ( ) ; i + + ) {
pathListStr . append ( allowPathList . get ( i ) )
. append ( ROBOTS_DB_PATH_SEPARATOR ) ;
}
this . mem . put ( ALLOW_PATH_LIST , pathListStr . substring ( 0 , pathListStr . length ( ) - 1 ) ) ;
}
if ( ( disallowPathList ! = null ) & & ( disallowPathList . size ( ) > 0 ) ) {
this . denyPathList . addAll ( disallowPathList ) ;
final StringBuilder pathListStr = new StringBuilder ( ) ;
for ( int i = 0 ; i < disallowPathList . size ( ) ; i + + ) {
pathListStr . append ( disallowPathList . get ( i ) )
. append ( ROBOTS_DB_PATH_SEPARATOR ) ;
}
this . mem . put ( DISALLOW_PATH_LIST , pathListStr . substring ( 0 , pathListStr . length ( ) - 1 ) ) ;
}
}
public String toString ( ) {
final StringBuilder str = new StringBuilder ( ) ;
str . append ( ( this . hostName = = null ) ? "null" : this . hostName )
. append ( ": " ) ;
if ( this . mem ! = null ) {
str . append ( this . mem . toString ( ) ) ;
}
return str . toString ( ) ;
}
public String getSitemap ( ) {
return this . mem . containsKey ( SITEMAP ) ? ( String ) this . mem . get ( SITEMAP ) : null ;
}
public Date getLoadedDate ( ) {
if ( this . mem . containsKey ( LOADED_DATE ) ) {
return new Date ( Long . valueOf ( this . mem . get ( LOADED_DATE ) ) . longValue ( ) ) ;
}
return null ;
}
public void setLoadedDate ( final Date newLoadedDate ) {
if ( newLoadedDate ! = null ) {
this . mem . put ( LOADED_DATE , Long . toString ( newLoadedDate . getTime ( ) ) ) ;
}
}
public Date getModDate ( ) {
if ( this . mem . containsKey ( MOD_DATE ) ) {
return new Date ( Long . valueOf ( this . mem . get ( MOD_DATE ) ) . longValue ( ) ) ;
}
return null ;
}
public String getETag ( ) {
if ( this . mem . containsKey ( ETAG ) ) {
return this . mem . get ( ETAG ) ;
}
return null ;
}
public long getCrawlDelayMillis ( ) {
if ( this . mem . containsKey ( CRAWL_DELAY_MILLIS ) ) try {
return Long . parseLong ( this . mem . get ( CRAWL_DELAY_MILLIS ) ) ;
} catch ( final NumberFormatException e ) {
return 0 ;
}
if ( this . mem . containsKey ( CRAWL_DELAY ) ) try {
return 1000 * Integer . parseInt ( this . mem . get ( CRAWL_DELAY ) ) ;
} catch ( final NumberFormatException e ) {
return 0 ;
}
return 0 ;
}
public boolean isDisallowed ( String path ) {
if ( ( this . mem = = null ) | | ( this . denyPathList . size ( ) = = 0 ) ) return false ;
// if the path is null or empty we set it to /
if ( ( path = = null ) | | ( path . length ( ) = = 0 ) ) path = "/" ;
// escaping all occurences of ; because this char is used as special char in the Robots DB
else path = path . replaceAll ( ROBOTS_DB_PATH_SEPARATOR , "%3B" ) ;
final Iterator < String > pathIter = this . denyPathList . iterator ( ) ;
while ( pathIter . hasNext ( ) ) {
final String nextPath = pathIter . next ( ) ;
// disallow rule
if ( path . startsWith ( nextPath ) ) {
return true ;
}
}
return false ;
}
}
// methods that had been in robotsParser.java:
public static final int DOWNLOAD_ACCESS_RESTRICTED = 0 ;
public static final int DOWNLOAD_ROBOTS_TXT = 1 ;
public static final int DOWNLOAD_ETAG = 2 ;
public static final int DOWNLOAD_MODDATE = 3 ;
private static final String getHostPort ( final yacyURL theURL ) {
String urlHostPort = null ;
final int port = getPort ( theURL ) ;
urlHostPort = theURL . getHost ( ) + ":" + port ;
urlHostPort = urlHostPort . toLowerCase ( ) . intern ( ) ;
return urlHostPort ;
}
private static final int getPort ( final yacyURL theURL ) {
int port = theURL . getPort ( ) ;
if ( port = = - 1 ) {
if ( theURL . getProtocol ( ) . equalsIgnoreCase ( "http" ) ) {
port = 80 ;
} else if ( theURL . getProtocol ( ) . equalsIgnoreCase ( "https" ) ) {
port = 443 ;
}
}
return port ;
}
public yacyURL getSitemapURL ( final yacyURL theURL ) {
if ( theURL = = null ) throw new IllegalArgumentException ( ) ;
yacyURL sitemapURL = null ;
// generating the hostname:poart string needed to do a DB lookup
final String urlHostPort = getHostPort ( theURL ) ;
final RobotsTxt . Entry robotsTxt4Host = this . getEntry ( urlHostPort , true ) ;
try {
final String sitemapUrlStr = robotsTxt4Host . getSitemap ( ) ;
if ( sitemapUrlStr ! = null ) sitemapURL = new yacyURL ( sitemapUrlStr , null ) ;
} catch ( final MalformedURLException e ) { /* ignore this */ }
return sitemapURL ;
}
public Long getCrawlDelayMillis ( final yacyURL theURL ) {
if ( theURL = = null ) throw new IllegalArgumentException ( ) ;
Long crawlDelay = null ;
// generating the hostname:poart string needed to do a DB lookup
final String urlHostPort = getHostPort ( theURL ) ;
final RobotsTxt . Entry robotsTxt4Host = getEntry ( urlHostPort , true ) ;
try {
crawlDelay = robotsTxt4Host . getCrawlDelayMillis ( ) ;
} catch ( final NumberFormatException e ) { /* ignore this */ }
return crawlDelay ;
}
public boolean isDisallowed ( final yacyURL nexturl ) {
if ( nexturl = = null ) throw new IllegalArgumentException ( ) ;
// generating the hostname:port string needed to do a DB lookup
final String urlHostPort = getHostPort ( nexturl ) ;
RobotsTxt . Entry robotsTxt4Host = null ;
robotsTxt4Host = getEntry ( urlHostPort , true ) ;
return robotsTxt4Host . isDisallowed ( nexturl . getFile ( ) ) ;
}
private static Object [ ] downloadRobotsTxt ( final yacyURL robotsURL , int redirectionCount , final RobotsTxt . Entry entry ) throws Exception {
if ( redirectionCount < 0 ) return new Object [ ] { Boolean . FALSE , null , null } ;
redirectionCount - - ;
boolean accessCompletelyRestricted = false ;
byte [ ] robotsTxt = null ;
long downloadStart , downloadEnd ;
String eTag = null , oldEtag = null ;
Date lastMod = null ;
downloadStart = System . currentTimeMillis ( ) ;
// if we previously have downloaded this robots.txt then we can set the if-modified-since header
httpRequestHeader reqHeaders = new httpRequestHeader ( ) ;
// add yacybot user agent
reqHeaders . put ( httpRequestHeader . USER_AGENT , HTTPLoader . crawlerUserAgent ) ;
// adding referer
reqHeaders . put ( httpRequestHeader . REFERER , ( yacyURL . newURL ( robotsURL , "/" ) ) . toNormalform ( true , true ) ) ;
if ( entry ! = null ) {
oldEtag = entry . getETag ( ) ;
reqHeaders = new httpRequestHeader ( ) ;
final Date modDate = entry . getModDate ( ) ;
if ( modDate ! = null ) reqHeaders . put ( httpRequestHeader . IF_MODIFIED_SINCE , DateFormatter . formatRFC1123 ( entry . getModDate ( ) ) ) ;
}
// setup http-client
//TODO: adding Traffic statistic for robots download?
final httpClient client = new httpClient ( 10000 , reqHeaders ) ;
httpResponse res = null ;
try {
// sending the get request
res = client . GET ( robotsURL . toString ( ) ) ;
// check for interruption
if ( Thread . currentThread ( ) . isInterrupted ( ) ) throw new InterruptedException ( "Shutdown in progress." ) ;
// check the response status
if ( res . getStatusLine ( ) . startsWith ( "2" ) ) {
if ( ! res . getResponseHeader ( ) . mime ( ) . startsWith ( "text/plain" ) ) {
robotsTxt = null ;
if ( log . isFinest ( ) ) log . logFinest ( "Robots.txt from URL '" + robotsURL + "' has wrong mimetype '" + res . getResponseHeader ( ) . mime ( ) + "'." ) ;
} else {
// getting some metadata
eTag = res . getResponseHeader ( ) . containsKey ( httpRequestHeader . ETAG ) ? ( res . getResponseHeader ( ) . get ( httpRequestHeader . ETAG ) ) . trim ( ) : null ;
lastMod = res . getResponseHeader ( ) . lastModified ( ) ;
// if the robots.txt file was not changed we break here
if ( ( eTag ! = null ) & & ( oldEtag ! = null ) & & ( eTag . equals ( oldEtag ) ) ) {
if ( log . isFinest ( ) ) log . logFinest ( "Robots.txt from URL '" + robotsURL + "' was not modified. Abort downloading of new version." ) ;
return null ;
}
// downloading the content
final ByteBuffer sbb = new ByteBuffer ( ) ;
try {
FileUtils . copyToStream ( new BufferedInputStream ( res . getDataAsStream ( ) ) , new BufferedOutputStream ( sbb ) ) ;
} finally {
res . closeStream ( ) ;
}
robotsTxt = sbb . getBytes ( ) ;
downloadEnd = System . currentTimeMillis ( ) ;
if ( log . isFinest ( ) ) log . logFinest ( "Robots.txt successfully loaded from URL '" + robotsURL + "' in " + ( downloadEnd - downloadStart ) + " ms." ) ;
}
} else if ( res . getStatusCode ( ) = = 304 ) {
return null ;
} else if ( res . getStatusLine ( ) . startsWith ( "3" ) ) {
// getting redirection URL
String redirectionUrlString = res . getResponseHeader ( ) . get ( httpRequestHeader . LOCATION ) ;
if ( redirectionUrlString = = null ) {
if ( log . isFinest ( ) ) log . logFinest ( "robots.txt could not be downloaded from URL '" + robotsURL + "' because of missing redirecton header. [" + res . getStatusLine ( ) + "]." ) ;
robotsTxt = null ;
} else {
redirectionUrlString = redirectionUrlString . trim ( ) ;
// generating the new URL object
final yacyURL redirectionUrl = yacyURL . newURL ( robotsURL , redirectionUrlString ) ;
// following the redirection
if ( log . isFinest ( ) ) log . logFinest ( "Redirection detected for robots.txt with URL '" + robotsURL + "'." +
"\nRedirecting request to: " + redirectionUrl ) ;
return downloadRobotsTxt ( redirectionUrl , redirectionCount , entry ) ;
}
} else if ( res . getStatusCode ( ) = = 401 | | res . getStatusCode ( ) = = 403 ) {
accessCompletelyRestricted = true ;
if ( log . isFinest ( ) ) log . logFinest ( "Access to Robots.txt not allowed on URL '" + robotsURL + "'." ) ;
} else {
if ( log . isFinest ( ) ) log . logFinest ( "robots.txt could not be downloaded from URL '" + robotsURL + "'. [" + res . getStatusLine ( ) + "]." ) ;
robotsTxt = null ;
}
} catch ( final Exception e ) {
throw e ;
} finally {
if ( res ! = null ) {
// release connection
res . closeStream ( ) ;
}
}
return new Object [ ] { Boolean . valueOf ( accessCompletelyRestricted ) , robotsTxt , eTag , lastMod } ;
}
}