yacy_search_server/source/de/anomic/tools/nxTools.java

// nxTools.java 
// -------------------------------------
// (C) by Michael Peter Christen; mc@anomic.de
// 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 de.anomic.tools;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Vector;

public class nxTools {


    public static HashMap<String, String> table(Vector<String> list) {
    	Enumeration<String> i = list.elements();
    	int pos;
    	String line;
    	HashMap<String, String> props = new HashMap<String, String>(list.size());
    	while (i.hasMoreElements()) {
    		line = ((String) i.nextElement()).trim();
    		pos = line.indexOf("=");
    		if (pos > 0) props.put(line.substring(0, pos).trim(), line.substring(pos + 1).trim());
    	}
    	return props;
	}
    
    public static HashMap<String, String> table(byte[] a, String encoding) {
        return table(strings(a, encoding));
    }
    
    /**
     * parse config files
     * 
     * splits the lines in list into pairs sperarated by =, lines beginning with # are ignored
     * ie:
     * abc=123
     * # comment
     * fg=dcf
     * => Map{abc => 123, fg => dcf}
     * @param list
     * @return
     */
    public static HashMap<String, String> table(ArrayList<String> list) {
        if (list == null) return new HashMap<String, String>();
        Iterator<String> i = list.iterator();
        int pos;
        String line;
        HashMap<String, String> props = new HashMap<String, String>(list.size());
        while (i.hasNext()) {
            line = ((String) i.next()).trim();
            if (line.startsWith("#")) continue; // exclude comments
            //System.out.println("NXTOOLS_PROPS - LINE:" + line);
            pos = line.indexOf("=");
            if (pos > 0) props.put(line.substring(0, pos).trim(), line.substring(pos + 1).trim());
        }
        return props;
    }

    public static Vector<String> grep(Vector<String> list, int afterContext, String pattern) {
    	Enumeration<String> i = list.elements();
    	int ac = 0;
		String line;
		Vector<String> result = new Vector<String>();
		while (i.hasMoreElements()) {
			line = (String) 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(ArrayList<String> list, int afterContext, String pattern) {
        Iterator<String> i = list.iterator();
        int ac = 0;
        String line;
        ArrayList<String> result = new ArrayList<String>();
        while (i.hasNext()) {
            line = (String) 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(Vector<String> list) {
    	if ((list == null) || (list.size() == 0)) return "";
    	return (String) list.lastElement();
    }
    
    public static String tail1(ArrayList<String> list) {
        if ((list == null) || (list.size() == 0)) return "";
        return (String) list.get(list.size()-1);
        }

    public static String awk(String sentence, 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; else return null;
	    } else {
		if (count == 1) return sentence.substring(0, pos);
		sentence = sentence.substring(pos + separator.length());
		count--;
	    }
	}
        return null;
    }

    public static ArrayList<String> strings(byte[] a) {
        return strings(a, null);
    }
    
    public static ArrayList<String> strings(byte[] a, String encoding) {
        if (a == null) return new ArrayList<String>();
        int s = 0;
        int e;
        ArrayList<String> v = new ArrayList<String>();
        byte b;
        while (s < a.length) {
            // find eol
            e = s;
            while (e < a.length) {
                b = a[e];
                if ((b == 10) || (b == 13) || (b == 0)) break;
                e++;
            }
            
            // read line
            if (encoding == null) {
                v.add(new String(a, s, e - s));
            } else try {
                v.add(new String(a, s, e - s, encoding));
            } catch (UnsupportedEncodingException xcptn) {
                return v;
            }
            
            // eat up additional eol bytes
            s = e + 1;
            while (s < a.length) {
                b = a[s];
                if ((b != 10) && (b != 13)) break;
                s++;
            }
        }
        return v;
    }
    
    public static String line(byte[] a, int lineNr) {
        InputStreamReader r = new InputStreamReader(new ByteArrayInputStream(a));
        LineNumberReader lnr = new LineNumberReader(r);
        String theLine = null;
        while (lnr.getLineNumber() < lineNr) {
            try {
                theLine = lnr.readLine();
            } catch (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(String url, int len) {
        // This is contributed by Thomas Quella (borg-0300)
        if (url == null) { return null; }
        int la = url.length();
        if (la > len) {
            int cpos;
            cpos = url.indexOf("://");
            if (cpos >= 0) {
                cpos = url.indexOf("/", cpos + 3);
                if (cpos >= 0) {
                    if (cpos < len-(len / 3)) { // at least 1/3 characters for the path
                        final int lb = ((len - cpos) / 2) - 1;
                        if (lb * 2 + 2 + cpos < len) { la--; } // if smaller(odd), half right path + 1
                        return url.substring(0, cpos + lb).concat("..").concat(url.substring(la - lb));
                    } else {
                        return url.substring(0, len - 2).concat("..");
                    }
                } else { // very crazy domain or very short len
                    return url.substring(0, len - 2).concat("..");
                } // no slash at end
            } // NO URL !?
        } // URL < len
        return url;
    }

}