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package de.lmu.ifi.dbs.elki.database.ids.generic;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2015
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 de.lmu.ifi.dbs.elki.database.ids.DBIDIter;
import de.lmu.ifi.dbs.elki.database.ids.DBIDMIter;
import de.lmu.ifi.dbs.elki.database.ids.DBIDRef;
import de.lmu.ifi.dbs.elki.database.ids.DBIDs;
import de.lmu.ifi.dbs.elki.database.ids.StaticDBIDs;
/**
* Unmodifiable wrapper for DBIDs.
*
* @author Erich Schubert
* @since 0.4.0
*
* @apiviz.uses DBIDs
* @apiviz.has UnmodifiableDBIDIter
*/
public class UnmodifiableDBIDs implements StaticDBIDs {
/**
* The DBIDs we wrap.
*/
private final DBIDs inner;
/**
* Constructor.
*
* @param inner Inner DBID collection.
*/
public UnmodifiableDBIDs(DBIDs inner) {
super();
this.inner = inner;
}
@Override
public boolean contains(DBIDRef o) {
return inner.contains(o);
}
@Override
public boolean isEmpty() {
return inner.isEmpty();
}
@Override
public DBIDIter iter() {
DBIDIter it = inner.iter();
if(it instanceof DBIDMIter) {
return new UnmodifiableDBIDIter(it);
}
return it;
}
@Override
public int size() {
return inner.size();
}
@Override
public String toString() {
return inner.toString();
}
/**
* Make an existing DBIDMIter unmodifiable.
*
* @author Erich Schubert
*/
class UnmodifiableDBIDIter implements DBIDIter {
/**
* Wrapped iterator.
*/
private DBIDIter it;
/**
* Constructor.
*
* @param it inner iterator
*/
public UnmodifiableDBIDIter(DBIDIter it) {
super();
this.it = it;
}
@Override
public boolean valid() {
return it.valid();
}
@Override
public DBIDIter advance() {
it.advance();
return this;
}
@Override
public int internalGetIndex() {
return it.internalGetIndex();
}
}
}
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