You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
118 lines
3.7 KiB
118 lines
3.7 KiB
// AbstractReference.java
|
|
// (C) 2009 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
|
|
// first published 14.04.2009 on http://yacy.net
|
|
//
|
|
// This is a part of YaCy, a peer-to-peer based web search engine
|
|
//
|
|
// $LastChangedDate$
|
|
// $LastChangedRevision$
|
|
// $LastChangedBy$
|
|
//
|
|
// LICENSE
|
|
//
|
|
// 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
|
|
|
|
package net.yacy.kelondro.rwi;
|
|
|
|
import java.util.Collection;
|
|
import java.util.Iterator;
|
|
|
|
|
|
public abstract class AbstractReference implements Reference {
|
|
|
|
protected static void a(Collection<Integer> a, int i) {
|
|
assert a != null;
|
|
if (i == Integer.MAX_VALUE || i == Integer.MIN_VALUE) return; // signal for 'do nothing'
|
|
a.clear();
|
|
a.add(i);
|
|
}
|
|
|
|
protected static int max(Collection<Integer> a, Collection<Integer> b) {
|
|
if (a == null || a.isEmpty()) return max(b);
|
|
if (b == null || b.isEmpty()) return max(a);
|
|
int ma = max(a);
|
|
int mb = max(b);
|
|
if (ma == Integer.MIN_VALUE) return mb;
|
|
if (mb == Integer.MIN_VALUE) return ma;
|
|
return Math.max(ma, mb);
|
|
}
|
|
|
|
protected static int min(Collection<Integer> a, Collection<Integer> b) {
|
|
assert a != null;
|
|
if (a == null || a.isEmpty()) return min(b);
|
|
if (b == null || b.isEmpty()) return min(a);
|
|
int ma = min(a);
|
|
int mb = min(b);
|
|
if (ma == Integer.MAX_VALUE) return mb;
|
|
if (mb == Integer.MAX_VALUE) return ma;
|
|
return Math.min(ma, mb);
|
|
}
|
|
|
|
private static int max(Collection<Integer> a) {
|
|
if (a == null || a.isEmpty()) return Integer.MIN_VALUE;
|
|
Iterator<Integer> i = a.iterator();
|
|
if (a.size() == 1) return i.next();
|
|
if (a.size() == 2) return Math.max(i.next(), i.next());
|
|
int r = i.next();
|
|
int s;
|
|
while (i.hasNext()) {
|
|
s = i.next();
|
|
if (s > r) r = s;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
private static int min(Collection<Integer> a) {
|
|
if (a == null || a.isEmpty()) return Integer.MAX_VALUE;
|
|
Iterator<Integer> i = a.iterator();
|
|
if (a.size() == 1) return i.next();
|
|
if (a.size() == 2) return Math.min(i.next(), i.next());
|
|
int r = i.next();
|
|
int s;
|
|
while (i.hasNext()) {
|
|
s = i.next();
|
|
if (s < r) r = s;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
public int maxposition() {
|
|
return max(positions());
|
|
}
|
|
|
|
public int minposition() {
|
|
return min(positions());
|
|
}
|
|
|
|
public int distance() {
|
|
if (positions().size() < 2) return 0;
|
|
int d = 0;
|
|
Iterator<Integer> i = positions().iterator();
|
|
int s0 = i.next(), s1;
|
|
while (i.hasNext()) {
|
|
s1 = i.next();
|
|
d += Math.abs(s0 - s1);
|
|
s0 = s1;
|
|
}
|
|
return d / (positions().size() - 1);
|
|
}
|
|
|
|
public boolean isOlder(final Reference other) {
|
|
if (other == null) return false;
|
|
if (this.lastModified() < other.lastModified()) return true;
|
|
return false;
|
|
}
|
|
}
|