// 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 grep(final Vector list, final int afterContext, final String pattern) { final Enumeration i = list.elements(); int ac = 0; String line; final Vector result = new Vector(); 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 grep(final ArrayList list, final int afterContext, final String pattern) { final Iterator i = list.iterator(); int ac = 0; String line; final ArrayList result = new ArrayList(); 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 list) { if (list == null || list.isEmpty()) return ""; return list.lastElement(); } public static String tail1(final ArrayList 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
* * Example returns:
*
normal domain:
http://domain.net/leftpath..rightpath
*
long domain:
http://very_very_long_domain.net/le..
* @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; } }