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package de.lmu.ifi.dbs.elki.data.type;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2012
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.data.FeatureVector;
import de.lmu.ifi.dbs.elki.persistent.ByteBufferSerializer;
/**
* Construct a type information for vector spaces with fixed dimensionality.
*
* @author Erich Schubert
*
* @param <V> Vector type
*/
public class VectorTypeInformation<V extends FeatureVector<?>> extends SimpleTypeInformation<V> {
/**
* Minimum dimensionality.
*/
protected final int mindim;
/**
* Maximum dimensionality.
*/
protected final int maxdim;
/**
* Constructor for an actual type.
*
* @param cls base class
* @param serializer Serializer
* @param mindim Minimum dimensionality
* @param maxdim Maximum dimensionality
*/
public VectorTypeInformation(Class<? super V> cls, ByteBufferSerializer<? super V> serializer, int mindim, int maxdim) {
super(cls, serializer);
assert (this.mindim <= this.maxdim);
this.mindim = mindim;
this.maxdim = maxdim;
}
/**
* Constructor for a type request.
*
* @param cls base class
* @param mindim Minimum dimensionality
* @param maxdim Maximum dimensionality
*/
public VectorTypeInformation(Class<? super V> cls, int mindim, int maxdim) {
this(cls, null, mindim, maxdim);
}
/**
* Constructor for a type request without dimensionality constraints.
*
* @param cls Class constraint
*/
public VectorTypeInformation(Class<? super V> cls) {
this(cls, null, -1, Integer.MAX_VALUE);
}
@Override
public boolean isAssignableFromType(TypeInformation type) {
// This validates the base type V
if(!super.isAssignableFromType(type)) {
return false;
}
// Other type must also be a vector type
if(!(type instanceof VectorTypeInformation)) {
return false;
}
VectorTypeInformation<?> othertype = (VectorTypeInformation<?>) type;
assert (othertype.mindim <= othertype.maxdim);
// the other must not have a lower minimum dimensionality
if(this.mindim > othertype.mindim) {
return false;
}
// ... or a higher maximum dimensionality.
if(othertype.maxdim > this.maxdim) {
return false;
}
return true;
}
@Override
public boolean isAssignableFrom(Object other) {
// Validate that we can assign
if(!super.isAssignableFrom(other)) {
return false;
}
// Get the object dimensionality
final int odim = cast(other).getDimensionality();
if(odim < mindim) {
return false;
}
if(odim > maxdim) {
return false;
}
return true;
}
/**
* Get the minimum dimensionality of the occurring vectors.
*
* @return dimensionality
*/
public int mindim() {
if(mindim < 0) {
throw new UnsupportedOperationException("Requesting dimensionality for a request without defined dimensionality!");
}
return mindim;
}
/**
* Get the maximum dimensionality of the occurring vectors.
*
* @return dimensionality
*/
public int maxdim() {
if(maxdim == Integer.MAX_VALUE) {
throw new UnsupportedOperationException("Requesting dimensionality for a request without defined dimensionality!");
}
return maxdim;
}
@Override
public String toString() {
StringBuilder buf = new StringBuilder(super.toString());
buf.append(",variable");
if(mindim >= 0) {
buf.append(",mindim=").append(mindim);
}
if(maxdim < Integer.MAX_VALUE) {
buf.append(",maxdim=").append(maxdim);
}
return buf.toString();
}
}
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