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618 lines
25 KiB
Java
618 lines
25 KiB
Java
// kelondroMSetTools.java
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// -------------------------------------
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// (C) by Michael Peter Christen; mc@yacy.net
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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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// $LastChangedDate$
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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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package net.yacy.kelondro.util;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Comparator;
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import java.util.ConcurrentModificationException;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.SortedMap;
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import java.util.SortedSet;
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import java.util.TreeMap;
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import java.util.TreeSet;
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import net.yacy.cora.document.UTF8;
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import net.yacy.cora.storage.HandleSet;
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import net.yacy.cora.util.ConcurrentLog;
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public final class SetTools {
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//public static Comparator fastStringComparator = fastStringComparator(true);
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// ------------------------------------------------------------------------------------------------
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// helper methods
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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 logarithm 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 algorithm to perform the join can be also of two kind:
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// - join by pairwise enumeration
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// - join by iterative tests (where we distinguish left-right and right-left tests)
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public static <A, B> SortedMap<A, B> joinConstructive(final Collection<SortedMap<A, B>> maps, final boolean concatStrings) {
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// this joins all TreeMap(s) contained in maps
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// first order entities by their size
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final SortedMap<Long, SortedMap<A, B>> orderMap = new TreeMap<Long, SortedMap<A, B>>();
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SortedMap<A, B> singleMap;
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final Iterator<SortedMap<A, B>> i = maps.iterator();
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int count = 0;
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while (i.hasNext()) {
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// get next entity:
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singleMap = i.next();
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// check result
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if ((singleMap == null) || (singleMap.isEmpty())) return new TreeMap<A, B>();
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// store result in order of result size
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orderMap.put(Long.valueOf(singleMap.size() * 1000 + count), singleMap);
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count++;
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}
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// check if there is any result
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if (orderMap.isEmpty()) return new TreeMap<A, B>();
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// we now must pairwise build up a conjunction of these maps
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Long k = orderMap.firstKey(); // the smallest, which means, the one with the least entries
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SortedMap<A, B> mapA, mapB, joinResult = orderMap.remove(k);
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while (!orderMap.isEmpty() && !joinResult.isEmpty()) {
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// take the first element of map which is a result and combine it with result
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k = orderMap.firstKey(); // the next smallest...
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mapA = joinResult;
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mapB = orderMap.remove(k);
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joinResult = joinConstructiveByTest(mapA, mapB, concatStrings); // TODO: better with enumeration?
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// free resources
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mapA = null;
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mapB = null;
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}
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// in 'searchResult' is now the combined search result
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if (joinResult.isEmpty()) return new TreeMap<A, B>();
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return joinResult;
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}
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public static <A, B> SortedMap<A, B> joinConstructive(final SortedMap<A, B> map1, final SortedMap<A, B> map2, final boolean concatStrings) {
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// comparators must be equal
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if ((map1 == null) || (map2 == null)) return null;
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if (map1.comparator() != map2.comparator()) return null;
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if (map1.isEmpty() || map2.isEmpty()) return new TreeMap<A, B>(map1.comparator());
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// decide which method to use
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final int high = ((map1.size() > map2.size()) ? map1.size() : map2.size());
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final int low = ((map1.size() > map2.size()) ? map2.size() : map1.size());
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final int stepsEnum = 10 * (high + low - 1);
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final 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 (map1.size() > map2.size()) return joinConstructiveByTest(map2, map1, concatStrings);
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return joinConstructiveByTest(map1, map2, concatStrings);
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}
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return joinConstructiveByEnumeration(map1, map2, concatStrings);
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}
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@SuppressWarnings("unchecked")
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private static <A, B> SortedMap<A, B> joinConstructiveByTest(final SortedMap<A, B> small, final SortedMap<A, B> large, final boolean concatStrings) {
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final SortedMap<A, B> result = new TreeMap<A, B>(large.comparator());
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synchronized (small) {
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final Iterator<Map.Entry<A, B>> mi = small.entrySet().iterator();
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Map.Entry<A, B> mentry1;
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B mobj2;
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loop: while (mi.hasNext()) {
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try {
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mentry1 = mi.next();
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synchronized (large) {
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mobj2 = large.get(mentry1.getKey());
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}
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if (mobj2 != null) {
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if (mentry1.getValue() instanceof String) {
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result.put(mentry1.getKey(), (B) ((concatStrings) ? (((String) mentry1.getValue()) + (String) mobj2) : (String) mentry1.getValue()));
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} else if (mentry1.getValue() instanceof StringBuilder) {
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result.put(mentry1.getKey(), (B) ((concatStrings) ? (((StringBuilder) mentry1.getValue()).append((StringBuilder) mobj2)) : mentry1.getValue()));
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} else {
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result.put(mentry1.getKey(), mentry1.getValue());
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}
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}
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} catch (final ConcurrentModificationException e) {
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ConcurrentLog.warn("SetTools", e.getMessage(), e);
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break loop;
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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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@SuppressWarnings("unchecked")
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private static <A, B> SortedMap<A, B> joinConstructiveByEnumeration(final SortedMap<A, B> map1, final SortedMap<A, B> map2, final boolean concatStrings) {
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// implement pairwise enumeration
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final Comparator<? super A> comp = map1.comparator();
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final Iterator<Map.Entry<A, B>> mi1 = map1.entrySet().iterator();
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final Iterator<Map.Entry<A, B>> mi2 = map2.entrySet().iterator();
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final SortedMap<A, B> result = new TreeMap<A, B>(map1.comparator());
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int c;
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if ((mi1.hasNext()) && (mi2.hasNext())) {
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Map.Entry<A, B> mentry1 = mi1.next();
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Map.Entry<A, B> mentry2 = mi2.next();
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while (true) {
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c = comp.compare(mentry1.getKey(), mentry2.getKey());
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if (c < 0) {
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if (mi1.hasNext()) mentry1 = mi1.next(); else break;
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} else if (c > 0) {
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if (mi2.hasNext()) mentry2 = mi2.next(); else break;
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} else {
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if (mentry1.getValue() instanceof String) {
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result.put(mentry1.getKey(), (B) ((concatStrings) ? (((String) mentry1.getValue()) + (String) mentry2.getValue()) : (String) mentry1.getValue()));
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} else if (mentry1.getValue() instanceof StringBuilder) {
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result.put(mentry1.getKey(), (B) ((concatStrings) ? (((StringBuilder) mentry1.getValue()).append((StringBuilder) mentry2.getValue())) : (StringBuilder) mentry1.getValue()));
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} else {
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result.put(mentry1.getKey(), mentry1.getValue());
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}
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if (mi1.hasNext()) mentry1 = mi1.next(); else break;
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if (mi2.hasNext()) mentry2 = mi2.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 <A> SortedSet<A> joinConstructive(final SortedSet<A> set1, final SortedSet<A> 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.isEmpty() || set2.isEmpty()) return new TreeSet<A>(set1.comparator());
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// decide which method to use
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final int high = ((set1.size() > set2.size()) ? set1.size() : set2.size());
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final int low = ((set1.size() > set2.size()) ? set2.size() : set1.size());
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final int stepsEnum = 10 * (high + low - 1);
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final 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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public static <A> SortedSet<A> joinConstructiveByTest(final Collection<A> small, final SortedSet<A> large) {
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final Iterator<A> mi = small.iterator();
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final SortedSet<A> result = new TreeSet<A>(large.comparator());
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A 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 <A> SortedSet<A> joinConstructiveByEnumeration(final SortedSet<A> set1, final SortedSet<A> set2) {
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// implement pairwise enumeration
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final Comparator<? super A> comp = set1.comparator();
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final Iterator<A> mi = set1.iterator();
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final Iterator<A> si = set2.iterator();
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final SortedSet<A> result = new TreeSet<A>(set1.comparator());
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int c;
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if ((mi.hasNext()) && (si.hasNext())) {
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A mobj = mi.next();
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A sobj = si.next();
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while (true) {
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c = comp.compare(mobj, sobj);
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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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* test if one set is totally included in another set
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* @param <A>
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* @param small
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* @param large
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* @return true if the small set is completely included in the large set
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*/
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public static <A> boolean totalInclusion(final Set<A> small, final Set<A> large) {
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for (A o: small) {
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if (!large.contains(o)) return false;
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}
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return true;
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}
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/**
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* test if one set is totally included in another set
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* @param small
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* @param large
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* @return true if the small set is completely included in the large set
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*/
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public static boolean totalInclusion(final HandleSet small, final HandleSet large) {
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for (byte[] handle: small) {
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if (!large.has(handle)) return false;
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}
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return true;
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}
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/**
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* test if the intersection of two sets is not empty
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* @param <A>
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* @param set1
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* @param set2
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* @return true if any element of the first set is part of the second set or vice-versa
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*/
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public static <A> boolean anymatch(final SortedSet<A> set1, final SortedSet<A> set2) {
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// comparators must be equal
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if ((set1 == null) || (set2 == null)) return false;
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if (set1.comparator() != set2.comparator()) return false;
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if (set1.isEmpty() || set2.isEmpty()) return false;
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// decide which method to use
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final int high = ((set1.size() > set2.size()) ? set1.size() : set2.size());
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final int low = ((set1.size() > set2.size()) ? set2.size() : set1.size());
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final int stepsEnum = 10 * (high + low - 1);
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final 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 anymatchByTest(set1, set2);
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return anymatchByTest(set2, set1);
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}
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return anymatchByEnumeration(set1, set2);
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}
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/**
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* test if the intersection of two sets is not empty
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* @param set1
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* @param set2
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* @return true if any element of the first set is part of the second set or vice-versa
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*/
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public static boolean anymatch(final HandleSet set1, final HandleSet set2) {
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// comparators must be equal
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if ((set1 == null) || (set2 == null)) return false;
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if (set1.comparator() != set2.comparator()) return false;
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if (set1.isEmpty() || set2.isEmpty()) return false;
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// decide which method to use
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final int high = ((set1.size() > set2.size()) ? set1.size() : set2.size());
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final int low = ((set1.size() > set2.size()) ? set2.size() : set1.size());
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final int stepsEnum = 10 * (high + low - 1);
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final 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 anymatchByTest(set1, set2);
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return anymatchByTest(set2, set1);
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}
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return anymatchByEnumeration(set1, set2);
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}
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private static <A> boolean anymatchByTest(final SortedSet<A> small, final SortedSet<A> large) {
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final Iterator<A> mi = small.iterator();
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A o;
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while (mi.hasNext()) {
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o = mi.next();
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if (large.contains(o)) return true;
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}
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return false;
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}
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private static boolean anymatchByTest(final HandleSet small, final HandleSet large) {
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final Iterator<byte[]> mi = small.iterator();
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byte[] o;
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while (mi.hasNext()) {
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o = mi.next();
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if (large.has(o)) return true;
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}
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return false;
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}
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private static <A> boolean anymatchByEnumeration(final SortedSet<A> set1, final SortedSet<A> set2) {
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// implement pairwise enumeration
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final Comparator<? super A> comp = set1.comparator();
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final Iterator<A> mi = set1.iterator();
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final Iterator<A> si = set2.iterator();
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int c;
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if ((mi.hasNext()) && (si.hasNext())) {
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A mobj = mi.next();
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A sobj = si.next();
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while (true) {
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c = comp.compare(mobj, sobj);
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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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return true;
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}
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}
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}
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return false;
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}
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private static boolean anymatchByEnumeration(final HandleSet set1, final HandleSet set2) {
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// implement pairwise enumeration
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final Comparator<byte[]> comp = set1.comparator();
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final Iterator<byte[]> mi = set1.iterator();
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final Iterator<byte[]> si = set2.iterator();
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int c;
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if ((mi.hasNext()) && (si.hasNext())) {
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byte[] mobj = mi.next();
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byte[] sobj = si.next();
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while (true) {
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c = comp.compare(mobj, sobj);
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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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return true;
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}
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}
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}
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return false;
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}
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// ------------------------------------------------------------------------------------------------
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// exclude
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/*
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public static <A, B> TreeMap<A, B> excludeConstructive(final TreeMap<A, B> map, final Set<A> set) {
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if (map == null) return null;
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if (set == null) return map;
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if (map.isEmpty() || set.isEmpty()) return map;
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assert !(set instanceof TreeSet) || map.comparator() == ((TreeSet<A>) set).comparator();
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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 <A, B> TreeMap<A, B> excludeConstructiveByTestMapInSet(final TreeMap<A, B> map, final Set<A> set) {
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final TreeMap<A, B> result = new TreeMap<A, B>(map.comparator());
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A o;
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for (Entry<A, B> entry: map.entrySet()) {
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o = entry.getKey();
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if (!(set.contains(o))) result.put(o, entry.getValue());
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}
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return result;
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}
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*/
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public static <A, B> void excludeDestructive(final Map<A, B> map, final Set<A> 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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assert !(map instanceof SortedMap<?,?> && set instanceof SortedSet<?>) || ((SortedMap<A, B>) map).comparator() == ((SortedSet<A>) set).comparator();
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if (map.isEmpty() || set.isEmpty()) 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 <A, B> void excludeDestructiveByTestMapInSet(final Map<A, B> map, final Set<A> set) {
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final Iterator<A> 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 <A, B> void excludeDestructiveByTestSetInMap(final Map<A, B> map, final Set<A> set) {
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final Iterator<A> si = set.iterator();
|
|
while (si.hasNext()) map.remove(si.next());
|
|
}
|
|
|
|
// and the same again with set-set
|
|
public static <A> void excludeDestructive(final Set<A> set1, final Set<A> set2) {
|
|
if (set1 == null) return;
|
|
if (set2 == null) return;
|
|
assert !(set1 instanceof SortedSet<?> && set2 instanceof SortedSet<?>) || ((SortedSet<A>) set1).comparator() == ((SortedSet<A>) set2).comparator();
|
|
if (set1.isEmpty() || set2.isEmpty()) return;
|
|
|
|
if (set1.size() < set2.size())
|
|
excludeDestructiveByTestSmallInLarge(set1, set2);
|
|
else
|
|
excludeDestructiveByTestLargeInSmall(set1, set2);
|
|
}
|
|
|
|
public static <A> void excludeDestructiveByTestSmallInLarge(final Collection<A> small, final Set<A> large) {
|
|
final Iterator<A> mi = small.iterator();
|
|
while (mi.hasNext()) if (large.contains(mi.next())) mi.remove();
|
|
}
|
|
|
|
public static <A> void excludeDestructiveByTestLargeInSmall(final Set<A> large, final Collection<A> small) {
|
|
final Iterator<A> si = small.iterator();
|
|
while (si.hasNext()) large.remove(si.next());
|
|
}
|
|
|
|
// ------------------------------------------------------------------------------------------------
|
|
|
|
public static SortedMap<String, String> loadMap(final String filename, final String sep) {
|
|
final SortedMap<String, String> map = new TreeMap<String, String>();
|
|
BufferedReader br = null;
|
|
try {
|
|
br = new BufferedReader(new InputStreamReader(new FileInputStream(filename)));
|
|
String line;
|
|
int pos;
|
|
while ((line = br.readLine()) != null) {
|
|
line = line.trim();
|
|
if ((!line.isEmpty() && line.charAt(0) != '#') && ((pos = line.indexOf(sep)) > 0))
|
|
map.put(line.substring(0, pos).trim().toLowerCase(), line.substring(pos + sep.length()).trim());
|
|
}
|
|
} catch (final IOException e) {
|
|
} finally {
|
|
if (br != null) try { br.close(); } catch (final Exception e) {}
|
|
}
|
|
return map;
|
|
}
|
|
|
|
public static SortedMap<String, List<String>> loadMapMultiValsPerKey(final String filename, final String sep) {
|
|
final SortedMap<String, List<String>> map = new TreeMap<String, List<String>>();
|
|
BufferedReader br = null;
|
|
try {
|
|
br = new BufferedReader(new InputStreamReader(new FileInputStream(filename)));
|
|
String line, key, value;
|
|
int pos;
|
|
while ((line = br.readLine()) != null) {
|
|
line = line.trim();
|
|
if ((!line.isEmpty() && line.charAt(0) != '#') && ((pos = line.indexOf(sep)) > 0)) {
|
|
key = line.substring(0, pos).trim().toLowerCase();
|
|
value = line.substring(pos + sep.length()).trim();
|
|
if (!map.containsKey(key)) map.put(key, new ArrayList<String>());
|
|
map.get(key).add(value);
|
|
}
|
|
}
|
|
} catch (final IOException e) {
|
|
} finally {
|
|
if (br != null) try { br.close(); } catch (final Exception e) {}
|
|
}
|
|
return map;
|
|
}
|
|
|
|
public static SortedSet<String> loadList(final File file, final Comparator<String> c) {
|
|
final SortedSet<String> list = new TreeSet<String>(c);
|
|
if (!(file.exists())) return list;
|
|
|
|
BufferedReader br = null;
|
|
try {
|
|
br = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
|
|
String line;
|
|
while ((line = br.readLine()) != null) {
|
|
int i = line.indexOf("|"); // ignore text after char (Solr stopwordfile syntax allows for # and | )
|
|
if (i>0) line = line.substring(0,i-1);
|
|
line = line.trim();
|
|
if (!line.isEmpty() && line.charAt(0) != '#') list.add(line.trim().toLowerCase());
|
|
}
|
|
} catch (final IOException e) {
|
|
} finally {
|
|
if (br != null) try{br.close();}catch(final Exception e){}
|
|
}
|
|
return list;
|
|
}
|
|
|
|
public static String setToString(final HandleSet set, final char separator) {
|
|
final Iterator<byte[]> i = set.iterator();
|
|
final StringBuilder sb = new StringBuilder(set.size() * 7);
|
|
if (i.hasNext()) sb.append(UTF8.String(i.next()));
|
|
while (i.hasNext()) {
|
|
sb.append(separator).append(UTF8.String(i.next()));
|
|
}
|
|
return sb.toString();
|
|
}
|
|
|
|
public static String setToString(final Set<String> set, final char separator) {
|
|
final Iterator<String> i = set.iterator();
|
|
final StringBuilder sb = new StringBuilder(set.size() * 7);
|
|
if (i.hasNext()) sb.append(i.next());
|
|
while (i.hasNext()) {
|
|
sb.append(separator).append(i.next());
|
|
}
|
|
return sb.toString();
|
|
}
|
|
|
|
public static Object nth(Collection<?> c, int n) {
|
|
if (c == null || c.size() <= n) return null;
|
|
int i = 0;
|
|
for (Object o: c) if (i++ == n) return o;
|
|
return null;
|
|
}
|
|
|
|
// ------------------------------------------------------------------------------------------------
|
|
|
|
|
|
public static void main(final String[] args) {
|
|
final SortedMap<String, String> m = new TreeMap<String, String>();
|
|
final SortedMap<String, String> s = new TreeMap<String, String>();
|
|
m.put("a", "a");
|
|
m.put("x", "x");
|
|
m.put("f", "f");
|
|
m.put("h", "h");
|
|
m.put("w", "w");
|
|
m.put("7", "7");
|
|
m.put("t", "t");
|
|
m.put("k", "k");
|
|
m.put("y", "y");
|
|
m.put("z", "z");
|
|
s.put("a", "a");
|
|
s.put("b", "b");
|
|
s.put("c", "c");
|
|
s.put("k", "k");
|
|
s.put("l", "l");
|
|
s.put("m", "m");
|
|
s.put("n", "n");
|
|
s.put("o", "o");
|
|
s.put("p", "p");
|
|
s.put("q", "q");
|
|
s.put("r", "r");
|
|
s.put("s", "s");
|
|
s.put("t", "t");
|
|
s.put("x", "x");
|
|
System.out.println("Compare " + m.toString() + " with " + s.toString());
|
|
System.out.println("Join=" + joinConstructiveByEnumeration(m, s, true));
|
|
System.out.println("Join=" + joinConstructiveByTest(m, s, true));
|
|
System.out.println("Join=" + joinConstructiveByTest(m, s, true));
|
|
System.out.println("Join=" + joinConstructive(m, s, true));
|
|
//System.out.println("Exclude=" + excludeConstructiveByTestMapInSet(m, s.keySet()));
|
|
|
|
/*
|
|
for (int low = 0; low < 10; low++)
|
|
for (int high = 0; high < 100; high=high + 10) {
|
|
int stepsEnum = 10 * high;
|
|
int stepsTest = 12 * log2(high) * low;
|
|
System.out.println("low=" + low + ", high=" + high + ", stepsEnum=" + stepsEnum + ", stepsTest=" + stepsTest + "; best method is " + ((stepsEnum < stepsTest) ? "joinByEnumeration" : "joinByTest"));
|
|
}
|
|
*/
|
|
|
|
}
|
|
|
|
}
|