// nxTools.java
// -------------------------------------
// (C) by Michael Peter Christen; mc@yacy.net
// first published on http://www.anomic.de
// Frankfurt, Germany, 2004
//
// $LastChangedDate$
// $LastChangedRevision$
// $LastChangedBy$
//
// 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
//
// Using this software in any meaning (reading, learning, copying, compiling,
// running) means that you agree that the Author(s) is (are) not responsible
// for cost, loss of data or any harm that may be caused directly or indirectly
// by usage of this softare or this documentation. The usage of this software
// is on your own risk. The installation and usage (starting/running) of this
// software may allow other people or application to access your computer and
// any attached devices and is highly dependent on the configuration of the
// software which must be done by the user of the software; the author(s) is
// (are) also not responsible for proper configuration and usage of the
// software, even if provoked by documentation provided together with
// the software.
//
// Any changes to this file according to the GPL as documented in the file
// gpl.txt aside this file in the shipment you received can be done to the
// lines that follows this copyright notice here, but changes must not be
// done inside the copyright notice above. A re-distribution must contain
// the intact and unchanged copyright notice.
// Contributions and changes to the program code must be marked as such.
package net.yacy.utils;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Vector;
public class nxTools {
public static Vector<String> grep(final Vector<String> list, final int afterContext, final String pattern) {
final Enumeration<String> i = list.elements();
int ac = 0;
String line;
final Vector<String> result = new Vector<String>();
while (i.hasMoreElements()) {
line = i.nextElement();
if (line.indexOf(pattern) >= 0) {
result.add(line);
ac = afterContext + 1;
} else if (ac > 0) {
result.add(line);
}
ac--;
}
return result;
}
public static ArrayList<String> grep(final ArrayList<String> list, final int afterContext, final String pattern) {
final Iterator<String> i = list.iterator();
int ac = 0;
String line;
final ArrayList<String> result = new ArrayList<String>();
while (i.hasNext()) {
line = i.next();
if (line.indexOf(pattern) >= 0) {
result.add(line);
ac = afterContext + 1;
} else if (ac > 0) {
result.add(line);
}
ac--;
}
return result;
}
public static String tail1(final Vector<String> list) {
if (list == null || list.isEmpty()) return "";
return list.lastElement();
}
public static String tail1(final ArrayList<String> list) {
if (list == null || list.isEmpty()) return "";
return list.get(list.size()-1);
}
public static String awk(String sentence, final String separator, int count) {
// returns the nth word of sentence, where count is the counter and the first word has the number 1
// the words are separated by the separator
if ((sentence == null) || (separator == null) || (count < 1)) return null;
int pos;
while ((count >= 1) && (sentence.length() > 0)) {
pos = sentence.indexOf(separator);
if (pos < 0) {
if (count == 1) return sentence;
return null;
}
if (count == 1) return sentence.substring(0, pos);
sentence = sentence.substring(pos + separator.length());
count--;
}
return null;
}
public static String line(final byte[] a, final int lineNr) {
final InputStreamReader r = new InputStreamReader(new ByteArrayInputStream(a));
final LineNumberReader lnr = new LineNumberReader(r);
String theLine = null;
while (lnr.getLineNumber() < lineNr) {
try {
theLine = lnr.readLine();
} catch (final IOException e) {
return null;
}
if (theLine == null) return null;
}
return theLine;
}
/**
* This function shorten URL Strings<br>
*
* Example returns:<br>
* <dl><dt>normal domain:</dt><dd>http://domain.net/leftpath..rightpath</dd>
* <dt>long domain:</dt><dd>http://very_very_long_domain.net/le..</dd></dl>
* @param url String like a URL
* @param len
* @return the shorten or the old String
*/
public static String shortenURLString(final String url, final int len) {
// This is contributed by Thomas Quella (borg-0300)
if (url == null) { return null; }
int urlLen = url.length();
if (urlLen > len) {
int cpos;
cpos = url.indexOf("://",0);
if (cpos >= 0) {
cpos = url.indexOf("/", cpos + 3);
if (cpos < 0) { // very crazy domain or very short len
return url.substring(0, len - 2).concat("..");
}
if (cpos >= len-(len / 3)) {
return url.substring(0, len - 2).concat("..");
}
// at least 1/3 characters for the path
final int lb = ((len - cpos) / 2) - 1;
if (lb * 2 + 2 + cpos < len) { urlLen--; } // if smaller(odd), half right path + 1
return url.substring(0, cpos + lb).concat("..").concat(url.substring(urlLen - lb));
} // NO URL !?
} // URL < len
return url;
}
}