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package de.lmu.ifi.dbs.elki.database.ids.integer;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2011
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.util.AbstractList;
import java.util.Collection;
import java.util.Iterator;
import de.lmu.ifi.dbs.elki.database.ids.DBID;
import de.lmu.ifi.dbs.elki.database.ids.DBIDFactory;
import de.lmu.ifi.dbs.elki.database.ids.DBIDRange;
/**
* Representing a DBID range allocation
*
* @author Erich Schubert
*
* @apiviz.composedOf IntegerDBID
*/
class IntegerDBIDRange extends AbstractList<DBID> implements DBIDRange {
/**
* Start value
*/
protected final int start;
/**
* Length value
*/
protected final int len;
/**
* Constructor.
*
* @param start Range start
* @param len Range length
*/
protected IntegerDBIDRange(int start, int len) {
super();
this.start = start;
this.len = len;
}
@Override
public int size() {
return len;
}
@Override
public Iterator<DBID> iterator() {
return new Itr();
}
/**
* Iterator class.
*
* @author Erich Schubert
*
* @apiviz.exclude
*/
protected class Itr implements Iterator<DBID> {
int pos = 0;
@Override
public boolean hasNext() {
return pos < len;
}
@Override
public DBID next() {
DBID ret = DBIDFactory.FACTORY.importInteger(pos + start);
pos++;
return ret;
}
@Override
public void remove() {
throw new UnsupportedOperationException("CompactStaticDBIDs is read-only.");
}
}
/*
* "Contains" operations
*/
@Override
public boolean contains(Object o) {
if(o instanceof DBID) {
int oid = ((DBID) o).getIntegerID();
if(oid < start) {
return false;
}
if(oid >= start + len) {
return false;
}
return true;
}
return false;
}
@SuppressWarnings("unchecked")
@Override
public <T> T[] toArray(T[] a) {
T[] r = a;
if(a.length < start) {
r = (T[]) java.lang.reflect.Array.newInstance(a.getClass().getComponentType(), len);
}
for(int i = 0; i < start; i++) {
r[i] = (T) DBIDFactory.FACTORY.importInteger(len + i);
}
// zero-terminate array
if(r.length > len) {
r[len] = null;
}
return r;
}
@Override
public DBID get(int i) {
if (i > len || i < 0) {
throw new ArrayIndexOutOfBoundsException();
}
return DBIDFactory.FACTORY.importInteger(start + i);
}
/**
* For storage array offsets.
*
* @param dbid
* @return array offset
*/
@Override
public int getOffset(DBID dbid) {
return dbid.getIntegerID() - start;
}
@Override
public Collection<DBID> asCollection() {
return this;
}
}
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