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3b40b98256
*) minor changes git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@7567 6c8d7289-2bf4-0310-a012-ef5d649a1542
80 lines
2.3 KiB
Java
80 lines
2.3 KiB
Java
// AbstractOrder.java
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// -----------------------
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// part of The Kelondro Database
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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, 2005
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// created 29.12.2005
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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.order;
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public abstract class AbstractOrder<A> implements Order<A> {
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protected A zero = null;
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protected boolean asc = true;
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@Override
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abstract public Order<A> clone();
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public A zero() {
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return zero;
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}
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public void direction(final boolean ascending) {
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asc = ascending;
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}
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public long partition(final A key, final int forks) {
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final long d = (Long.MAX_VALUE / forks) + ((Long.MAX_VALUE % forks) + 1) / forks;
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return cardinal(key) / d;
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}
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public void rotate(final A newzero) {
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this.zero = newzero;
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}
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@SuppressWarnings("unchecked")
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@Override
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public boolean equals(final Object obj) {
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if (this == obj) return true;
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if (obj == null) return false;
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if (!(obj instanceof Order<?>)) return false;
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Order<A> other = (Order<A>) obj;
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final String thisSig = this.signature();
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final String otherSig = other.signature();
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if ((thisSig == null) || (otherSig == null)) return false;
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return thisSig.equals(otherSig);
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}
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@Override
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public int hashCode() {
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return this.signature().hashCode();
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}
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public A smallest(A a, A b) {
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return (compare(a, b) > 0) ? b : a;
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}
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public A largest(A a, A b) {
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return (compare(a, b) > 0) ? a : b;
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}
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}
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