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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) 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.data.FeatureVector;
import de.lmu.ifi.dbs.elki.utilities.io.ByteBufferSerializer;
/**
* Type information to specify that a type has a fixed dimensionality.
*
* @author Erich Schubert
*
* @param <V> Vector type
*/
public class VectorFieldTypeInformation<V extends FeatureVector<?>> extends VectorTypeInformation<V> implements FieldTypeInformation {
/**
* Constructor for a type request without dimensionality constraints.
*
* @param cls Class constraint
* @param <V> vector type
*/
public static <V extends FeatureVector<?>> VectorFieldTypeInformation<V> typeRequest(Class<? super V> cls) {
return new VectorFieldTypeInformation<>(cls, -1, Integer.MAX_VALUE);
}
/**
* Constructor for a type request with dimensionality constraints.
*
* @param cls Class constraint
* @param mindim Minimum dimensionality
* @param maxdim Maximum dimensionality
* @param <V> vector type
*/
public static <V extends FeatureVector<?>> VectorFieldTypeInformation<V> typeRequest(Class<? super V> cls, int mindim, int maxdim) {
return new VectorFieldTypeInformation<>(cls, mindim, maxdim);
}
/**
* Labels.
*/
private String[] labels = null;
/**
* Constructor with given dimensionality and factory, so usually an instance.
*
* @param factory Factory class
* @param dim Dimensionality
* @param labels Labels
* @param serializer Serializer
*/
public VectorFieldTypeInformation(FeatureVector.Factory<V, ?> factory, int dim, String[] labels, ByteBufferSerializer<? super V> serializer) {
super(factory, serializer, dim, dim);
this.labels = labels;
assert(labels == null || labels.length == dim) : "Created vector field with incomplete labels.";
}
/**
* Constructor with given dimensionality and factory, so usually an instance.
*
* @param factory Factory class
* @param mindim Minimum dimensionality
* @param maxdim Maximum dimensionality
* @param serializer Serializer
*/
public VectorFieldTypeInformation(FeatureVector.Factory<V, ?> factory, int mindim, int maxdim, ByteBufferSerializer<? super V> serializer) {
super(factory, serializer, mindim, maxdim);
}
/**
* Constructor with given dimensionality and factory, so usually an instance.
*
* @param factory Factory class
* @param dim Dimensionality
* @param serializer Serializer
*/
public VectorFieldTypeInformation(FeatureVector.Factory<V, ?> factory, int dim, ByteBufferSerializer<? super V> serializer) {
super(factory, serializer, dim, dim);
}
/**
* Constructor with given dimensionality and factory, so usually an instance.
*
* @param factory Factory class
* @param dim Dimensionality
* @param labels Labels
*/
public VectorFieldTypeInformation(FeatureVector.Factory<V, ?> factory, int dim, String[] labels) {
super(factory, factory.getDefaultSerializer(), dim, dim);
this.labels = labels;
assert(labels == null || labels.length == dim) : "Created vector field with incomplete labels.";
}
/**
* Constructor for a request with minimum and maximum dimensionality.
*
* @param cls Vector restriction class.
* @param mindim Minimum dimensionality request
* @param maxdim Maximum dimensionality request
*/
private VectorFieldTypeInformation(Class<? super V> cls, int mindim, int maxdim) {
super(cls, mindim, maxdim);
}
/**
* Constructor with given dimensionality and factory, so usually an instance.
*
* @param factory Factory class
* @param dim Dimensionality
*/
public VectorFieldTypeInformation(FeatureVector.Factory<V, ?> factory, int dim) {
super(factory, factory.getDefaultSerializer(), dim, dim);
}
@Override
public boolean isAssignableFromType(TypeInformation type) {
if(this == type) {
return true;
}
// Do all checks from superclass
if(!super.isAssignableFromType(type)) {
return false;
}
// Additionally check that mindim == maxdim.
VectorTypeInformation<?> other = (VectorTypeInformation<?>) type;
if(other.mindim != other.maxdim) {
return false;
}
return true;
}
@Override
public int getDimensionality() {
if(mindim != maxdim) {
throw new UnsupportedOperationException("Requesting dimensionality for a type request without defined dimensionality!");
}
return mindim;
}
@Override
public String toString() {
StringBuilder buf = new StringBuilder(getRestrictionClass().getSimpleName());
if(mindim == maxdim) {
buf.append(",dim=").append(mindim);
}
else {
buf.append(",field");
if(mindim >= 0) {
buf.append(",mindim=").append(mindim);
}
if(maxdim < Integer.MAX_VALUE) {
buf.append(",maxdim=").append(maxdim);
}
}
return buf.toString();
}
/**
* Get the column label.
*
* @param col Column number
* @return Label
*/
public String getLabel(int col) {
if(labels == null) {
return null;
}
return labels[col];
}
/**
* Get the column labels.
*
* @return labels
*/
protected String[] getLabels() {
return labels;
}
}
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