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412 lines
15 KiB
412 lines
15 KiB
// kelondroMSetTools.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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// last major change: 28.12.2004
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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 notive 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.kelondro;
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import java.io.File;
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import java.io.BufferedReader;
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import java.io.InputStreamReader;
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import java.io.IOException;
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import java.io.FileInputStream;
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import java.util.Comparator;
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import java.util.Iterator;
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import java.util.TreeMap;
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import java.util.TreeSet;
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public class kelondroMSetTools {
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//public static Comparator fastStringComparator = fastStringComparator(true);
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// ------------------------------------------------------------------------------------------------
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// helper methods
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private static int compare(Object a, Object b, Comparator c) {
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if (c != null) return c.compare(a,b);
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if ((a instanceof String) && (b instanceof String)) return ((String) a).compareTo((String) b);
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throw new ClassCastException();
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}
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public static int log2a(int x) {
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// this computes 1 + log2
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// it is the number of bits in x, not the logarithmus by 2
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int l = 0;
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while (x > 0) {x = x >>> 1; l++;}
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return l;
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}
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// ------------------------------------------------------------------------------------------------
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// join
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// We distinguish two principal solutions
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// - constructive join (generate new data structure)
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// - destructive join (remove non-valid elements from given data structure)
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// The alogorithm to perform the join can be also of two kind:
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// - join by pairvise enumeration
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// - join by iterative tests (where we distinguish left-right and right-left tests)
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public static TreeMap joinConstructive(TreeMap map, TreeSet set) {
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// comparators must be equal
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if ((map == null) || (set == null)) return null;
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if (map.comparator() != set.comparator()) return null;
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if ((map.size() == 0) || (set.size() == 0)) return new TreeMap(map.comparator());
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// decide which method to use
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int high = ((map.size() > set.size()) ? map.size() : set.size());
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int low = ((map.size() > set.size()) ? set.size() : map.size());
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int stepsEnum = 10 * (high + low - 1);
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int stepsTest = 12 * log2a(high) * low;
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// start most efficient method
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if (stepsEnum > stepsTest) {
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if (map.size() < set.size()) return joinConstructiveByTestSetInMap(map, set);
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return joinConstructiveByTestMapInSet(map, set);
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}
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return joinConstructiveByEnumeration(map, set);
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}
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private static TreeMap joinConstructiveByTestSetInMap(TreeMap map, TreeSet set) {
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Iterator si = set.iterator();
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TreeMap result = new TreeMap(map.comparator());
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Object o;
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while (si.hasNext()) {
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o = si.next();
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if (map.containsKey(o)) result.put(o, map.get(o));
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}
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return result;
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}
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private static TreeMap joinConstructiveByTestMapInSet(TreeMap map, TreeSet set) {
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Iterator mi = map.keySet().iterator();
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TreeMap result = new TreeMap(map.comparator());
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Object o;
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while (mi.hasNext()) {
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o = mi.next();
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if (set.contains(o)) result.put(o, map.get(o));
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}
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return result;
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}
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private static TreeMap joinConstructiveByEnumeration(TreeMap map, TreeSet set) {
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// implement pairvise enumeration
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Comparator comp = map.comparator();
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Iterator mi = map.keySet().iterator();
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Iterator si = set.iterator();
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TreeMap result = new TreeMap(map.comparator());
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int c;
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if ((mi.hasNext()) && (si.hasNext())) {
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Object mobj = mi.next();
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Object sobj = si.next();
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while (true) {
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c = compare(mobj, sobj, comp);
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if (c < 0) {
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if (mi.hasNext()) mobj = mi.next(); else break;
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} else if (c > 0) {
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if (si.hasNext()) sobj = si.next(); else break;
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} else {
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result.put(mobj, map.get(mobj));
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if (mi.hasNext()) mobj = mi.next(); else break;
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if (si.hasNext()) sobj = si.next(); else break;
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}
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}
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}
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return result;
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}
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// now the same for set-set
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public static TreeSet joinConstructive(TreeSet set1, TreeSet set2) {
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// comparators must be equal
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if ((set1 == null) || (set2 == null)) return null;
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if (set1.comparator() != set2.comparator()) return null;
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if ((set1.size() == 0) || (set2.size() == 0)) return new TreeSet(set1.comparator());
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// decide which method to use
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int high = ((set1.size() > set2.size()) ? set1.size() : set2.size());
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int low = ((set1.size() > set2.size()) ? set2.size() : set1.size());
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int stepsEnum = 10 * (high + low - 1);
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int stepsTest = 12 * log2a(high) * low;
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// start most efficient method
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if (stepsEnum > stepsTest) {
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if (set1.size() < set2.size()) return joinConstructiveByTest(set1, set2);
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return joinConstructiveByTest(set2, set1);
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}
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return joinConstructiveByEnumeration(set1, set2);
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}
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private static TreeSet joinConstructiveByTest(TreeSet small, TreeSet large) {
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Iterator mi = small.iterator();
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TreeSet result = new TreeSet(small.comparator());
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Object o;
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while (mi.hasNext()) {
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o = mi.next();
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if (large.contains(o)) result.add(o);
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}
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return result;
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}
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private static TreeSet joinConstructiveByEnumeration(TreeSet set1, TreeSet set2) {
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// implement pairvise enumeration
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Comparator comp = set1.comparator();
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Iterator mi = set1.iterator();
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Iterator si = set2.iterator();
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TreeSet result = new TreeSet(set1.comparator());
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int c;
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if ((mi.hasNext()) && (si.hasNext())) {
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Object mobj = mi.next();
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Object sobj = si.next();
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while (true) {
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c = compare(mobj, sobj, comp);
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if (c < 0) {
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if (mi.hasNext()) mobj = mi.next(); else break;
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} else if (c > 0) {
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if (si.hasNext()) sobj = si.next(); else break;
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} else {
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result.add(mobj);
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if (mi.hasNext()) mobj = mi.next(); else break;
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if (si.hasNext()) sobj = si.next(); else break;
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}
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}
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}
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return result;
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}
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// ------------------------------------------------------------------------------------------------
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// exclude
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public static TreeMap excludeConstructive(TreeMap map, TreeSet set) {
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// comparators must be equal
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if (map == null) return null;
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if (set == null) return map;
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if ((map.size() == 0) || (set.size() == 0)) return map;
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if (map.comparator() != set.comparator()) return excludeConstructiveByTestMapInSet(map, set);
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return excludeConstructiveByTestMapInSet(map, set);
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// return excludeConstructiveByEnumeration(map, set);
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}
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private static TreeMap excludeConstructiveByTestMapInSet(TreeMap map, TreeSet set) {
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Iterator mi = map.keySet().iterator();
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TreeMap result = new TreeMap(map.comparator());
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Object o;
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while (mi.hasNext()) {
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o = mi.next();
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if (!(set.contains(o))) result.put(o, map.get(o));
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}
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return result;
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}
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private static TreeMap excludeConstructiveByEnumeration(TreeMap map, TreeSet set) {
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// returns map without the elements in set
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// enumerates objects
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Comparator comp = map.comparator();
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Iterator mi = map.keySet().iterator();
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Iterator si = set.iterator();
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TreeMap result = new TreeMap(map.comparator());
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int c;
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if ((mi.hasNext()) && (si.hasNext())) {
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Object mobj = mi.next();
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Object sobj = si.next();
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while (true) {
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c = compare(mobj, sobj, comp);
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if (c < 0) {
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result.put(mobj, map.get(mobj));
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if (mi.hasNext()) mobj = mi.next();
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else break;
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} else if (c > 0) {
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if (si.hasNext()) sobj = si.next();
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else break;
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} else {
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if (mi.hasNext()) mobj = mi.next();
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else break;
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if (si.hasNext()) sobj = si.next();
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else {
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// final flush
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result.put(mobj, map.get(mobj));
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while (mi.hasNext()) {
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mobj = mi.next();
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result.put(mobj, map.get(mobj));
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}
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break;
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}
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}
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}
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}
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return result;
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}
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public static void excludeDestructive(TreeMap map, TreeSet set) {
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// comparators must be equal
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if (map == null) return;
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if (set == null) return;
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if (map.comparator() != set.comparator()) return;
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if ((map.size() == 0) || (set.size() == 0)) return;
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if (map.size() < set.size())
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excludeDestructiveByTestMapInSet(map, set);
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else
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excludeDestructiveByTestSetInMap(map, set);
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}
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private static void excludeDestructiveByTestMapInSet(TreeMap map, TreeSet set) {
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Iterator mi = map.keySet().iterator();
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while (mi.hasNext()) if (set.contains(mi.next())) mi.remove();
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}
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private static void excludeDestructiveByTestSetInMap(TreeMap map, TreeSet set) {
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Iterator si = set.iterator();
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while (si.hasNext()) map.remove(si.next());
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}
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// and the same again with set-set
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public static void excludeDestructive(TreeSet set1, TreeSet set2) {
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// comparators must be equal
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if (set1 == null) return;
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if (set2 == null) return;
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if (set1.comparator() != set2.comparator()) return;
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if ((set1.size() == 0) || (set2.size() == 0)) return;
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if (set1.size() < set2.size())
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excludeDestructiveByTestSmallInLarge(set1, set2);
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else
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excludeDestructiveByTestLargeInSmall(set1, set2);
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}
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private static void excludeDestructiveByTestSmallInLarge(TreeSet small, TreeSet large) {
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Iterator mi = small.iterator();
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while (mi.hasNext()) if (large.contains(mi.next())) mi.remove();
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}
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private static void excludeDestructiveByTestLargeInSmall(TreeSet large, TreeSet small) {
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Iterator si = small.iterator();
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while (si.hasNext()) large.remove(si.next());
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}
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// ------------------------------------------------------------------------------------------------
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public static TreeMap loadMap(String filename, String sep) {
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TreeMap map = new TreeMap();
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BufferedReader br = null;
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try {
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br = new BufferedReader(new InputStreamReader(new FileInputStream(filename)));
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String line;
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int pos;
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while ((line = br.readLine()) != null) {
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line = line.trim();
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if ((line.length() > 0) && (!(line.startsWith("#"))) && ((pos = line.indexOf(sep)) > 0))
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map.put(line.substring(0, pos).trim().toLowerCase(), line.substring(pos + sep.length()).trim());
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}
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} catch (IOException e) {
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} finally {
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if (br != null) try { br.close(); } catch (Exception e) {}
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}
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return map;
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}
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public static TreeSet loadList(File file, Comparator c) {
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TreeSet list = new TreeSet(c);
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if (!(file.exists())) return list;
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BufferedReader br = null;
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try {
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br = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
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String line;
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while ((line = br.readLine()) != null) {
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line = line.trim();
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if ((line.length() > 0) && (!(line.startsWith("#")))) list.add(line.trim().toLowerCase());
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}
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br.close();
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} catch (IOException e) {
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} finally {
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if (br != null) try{br.close();}catch(Exception e){}
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}
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return list;
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}
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// ------------------------------------------------------------------------------------------------
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public static void main(String[] args) {
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TreeMap m = new TreeMap();
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TreeSet s = new TreeSet();
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m.put("a", "a");
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m.put("x", "x");
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m.put("f", "f");
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m.put("h", "h");
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m.put("w", "w");
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m.put("7", "7");
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m.put("t", "t");
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m.put("k", "k");
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m.put("y", "y");
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m.put("z", "z");
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s.add("a");
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s.add("b");
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s.add("c");
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s.add("k");
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s.add("l");
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s.add("m");
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s.add("n");
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s.add("o");
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s.add("p");
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s.add("q");
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s.add("r");
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s.add("s");
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s.add("t");
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s.add("x");
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System.out.println("Compare " + m.toString() + " with " + s.toString());
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System.out.println("Join=" + joinConstructiveByEnumeration(m, s));
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System.out.println("Join=" + joinConstructiveByTestMapInSet(m, s));
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System.out.println("Join=" + joinConstructiveByTestSetInMap(m, s));
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System.out.println("Join=" + joinConstructive(m, s));
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System.out.println("Exclude=" + excludeConstructiveByEnumeration(m, s));
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/*
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for (int low = 0; low < 10; low++)
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for (int high = 0; high < 100; high=high + 10) {
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int stepsEnum = 10 * high;
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int stepsTest = 12 * log2(high) * low;
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System.out.println("low=" + low + ", high=" + high + ", stepsEnum=" + stepsEnum + ", stepsTest=" + stepsTest + "; best method is " + ((stepsEnum < stepsTest) ? "joinByEnumeration" : "joinByTest"));
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}
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*/
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}
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}
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