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package de.lmu.ifi.dbs.elki.utilities.datastructures.arraylike;
/*
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/>.
*/
/**
* Subset array adapter (allows reordering and projection).
*
* @author Erich Schubert
*
* @param <T> Entry type
* @param <A> Array type
*/
public class SubsetArrayAdapter<T, A> implements ArrayAdapter<T, A> {
/**
* Wrapped adapter.
*/
ArrayAdapter<T, ? super A> wrapped;
/**
* Offsets to return.
*/
int[] offs;
/**
* Constructor.
*
* @param wrapped Wrapped adapter
* @param offs Offsets
*/
public SubsetArrayAdapter(ArrayAdapter<T, ? super A> wrapped, int[] offs) {
super();
this.wrapped = wrapped;
this.offs = offs;
}
@Override
public int size(A array) {
return offs.length;
}
@Override
public T get(A array, int off) throws IndexOutOfBoundsException {
return wrapped.get(array, offs[off]);
}
}
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