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7feae906aa
- removed potential null pointer accesses - removed unnecessary casts git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@4893 6c8d7289-2bf4-0310-a012-ef5d649a1542
259 lines
9.2 KiB
Java
259 lines
9.2 KiB
Java
// nxTools.java
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// -------------------------------------
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2004
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//
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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notice above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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package de.anomic.tools;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.io.LineNumberReader;
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import java.io.UnsupportedEncodingException;
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import java.util.ArrayList;
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import java.util.Enumeration;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Vector;
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public class nxTools {
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public static HashMap<String, String> table(Vector<String> list) {
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Enumeration<String> i = list.elements();
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int pos;
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String line;
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HashMap<String, String> props = new HashMap<String, String>(list.size());
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while (i.hasMoreElements()) {
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line = (i.nextElement()).trim();
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pos = line.indexOf("=");
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if (pos > 0) props.put(line.substring(0, pos).trim(), line.substring(pos + 1).trim());
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}
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return props;
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}
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public static HashMap<String, String> table(byte[] a, String encoding) {
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return table(strings(a, encoding));
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}
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/**
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* parse config files
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*
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* splits the lines in list into pairs sperarated by =, lines beginning with # are ignored
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* ie:
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* abc=123
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* # comment
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* fg=dcf
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* => Map{abc => 123, fg => dcf}
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* @param list
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* @return
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*/
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public static HashMap<String, String> table(ArrayList<String> list) {
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if (list == null) return new HashMap<String, String>();
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Iterator<String> i = list.iterator();
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int pos;
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String line;
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HashMap<String, String> props = new HashMap<String, String>(list.size());
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while (i.hasNext()) {
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line = (i.next()).trim();
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if (line.startsWith("#")) continue; // exclude comments
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//System.out.println("NXTOOLS_PROPS - LINE:" + line);
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pos = line.indexOf("=");
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if (pos > 0) props.put(line.substring(0, pos).trim(), line.substring(pos + 1).trim());
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}
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return props;
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}
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public static Vector<String> grep(Vector<String> list, int afterContext, String pattern) {
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Enumeration<String> i = list.elements();
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int ac = 0;
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String line;
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Vector<String> result = new Vector<String>();
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while (i.hasMoreElements()) {
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line = i.nextElement();
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if (line.indexOf(pattern) >= 0) {
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result.add(line);
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ac = afterContext + 1;
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} else if (ac > 0) {
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result.add(line);
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}
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ac--;
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}
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return result;
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}
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public static ArrayList<String> grep(ArrayList<String> list, int afterContext, String pattern) {
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Iterator<String> i = list.iterator();
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int ac = 0;
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String line;
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ArrayList<String> result = new ArrayList<String>();
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while (i.hasNext()) {
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line = i.next();
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if (line.indexOf(pattern) >= 0) {
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result.add(line);
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ac = afterContext + 1;
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} else if (ac > 0) {
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result.add(line);
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}
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ac--;
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}
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return result;
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}
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public static String tail1(Vector<String> list) {
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if ((list == null) || (list.size() == 0)) return "";
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return list.lastElement();
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}
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public static String tail1(ArrayList<String> list) {
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if ((list == null) || (list.size() == 0)) return "";
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return list.get(list.size()-1);
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}
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public static String awk(String sentence, String separator, int count) {
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// returns the nth word of sentence, where count is the counter and the first word has the number 1
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// the words are separated by the separator
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if ((sentence == null) || (separator == null) || (count < 1)) return null;
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int pos;
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while ((count >= 1) && (sentence.length() > 0)) {
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pos = sentence.indexOf(separator);
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if (pos < 0) {
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if (count == 1) return sentence; else return null;
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} else {
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if (count == 1) return sentence.substring(0, pos);
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sentence = sentence.substring(pos + separator.length());
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count--;
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}
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}
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return null;
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}
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public static ArrayList<String> strings(byte[] a) {
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return strings(a, null);
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}
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public static ArrayList<String> strings(byte[] a, String encoding) {
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if (a == null) return new ArrayList<String>();
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int s = 0;
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int e;
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ArrayList<String> v = new ArrayList<String>();
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byte b;
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while (s < a.length) {
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// find eol
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e = s;
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while (e < a.length) {
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b = a[e];
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if ((b == 10) || (b == 13) || (b == 0)) break;
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e++;
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}
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// read line
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if (encoding == null) {
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v.add(new String(a, s, e - s));
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} else try {
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v.add(new String(a, s, e - s, encoding));
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} catch (UnsupportedEncodingException xcptn) {
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return v;
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}
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// eat up additional eol bytes
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s = e + 1;
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while (s < a.length) {
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b = a[s];
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if ((b != 10) && (b != 13)) break;
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s++;
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}
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}
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return v;
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}
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public static String line(byte[] a, int lineNr) {
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InputStreamReader r = new InputStreamReader(new ByteArrayInputStream(a));
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LineNumberReader lnr = new LineNumberReader(r);
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String theLine = null;
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while (lnr.getLineNumber() < lineNr) {
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try {
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theLine = lnr.readLine();
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} catch (IOException e) {
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return null;
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}
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if (theLine == null) return null;
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}
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return theLine;
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}
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/**
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* This function shorten URL Strings<br>
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*
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* Example returns:<br>
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* <dl><dt>normal domain:</dt><dd>http://domain.net/leftpath..rightpath</dd>
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* <dt>long domain:</dt><dd>http://very_very_long_domain.net/le..</dd></dl>
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* @param url String like a URL
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* @param len
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* @return the shorten or the old String
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*/
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public static String shortenURLString(String url, int len) {
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// This is contributed by Thomas Quella (borg-0300)
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if (url == null) { return null; }
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int la = url.length();
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if (la > len) {
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int cpos;
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cpos = url.indexOf("://");
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if (cpos >= 0) {
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cpos = url.indexOf("/", cpos + 3);
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if (cpos >= 0) {
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if (cpos < len-(len / 3)) { // at least 1/3 characters for the path
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final int lb = ((len - cpos) / 2) - 1;
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if (lb * 2 + 2 + cpos < len) { la--; } // if smaller(odd), half right path + 1
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return url.substring(0, cpos + lb).concat("..").concat(url.substring(la - lb));
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} else {
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return url.substring(0, len - 2).concat("..");
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}
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} else { // very crazy domain or very short len
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return url.substring(0, len - 2).concat("..");
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} // no slash at end
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} // NO URL !?
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} // URL < len
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return url;
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}
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}
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