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package de.lmu.ifi.dbs.elki.data;
/*
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 java.io.IOException;
import java.nio.ByteBuffer;
import de.lmu.ifi.dbs.elki.data.type.SimpleTypeInformation;
import de.lmu.ifi.dbs.elki.data.type.TypeUtil;
import de.lmu.ifi.dbs.elki.persistent.ByteArrayUtil;
import de.lmu.ifi.dbs.elki.persistent.ByteBufferSerializer;
/**
* A simple class label casting a String as it is as label.
*
* @author Arthur Zimek
*
* @apiviz.composedOf String
*/
public class SimpleClassLabel extends ClassLabel {
/**
* Serializer.
*/
public static final ByteBufferSerializer<SimpleClassLabel> SERIALIZER = new Serializer();
/**
* Holds the String designating the label.
*/
private String label;
/**
* Constructor.
*
* @param label Label
*/
public SimpleClassLabel(String label) {
super();
this.label = label;
}
/**
* The ordering of two SimpleClassLabels is given by the ordering on the
* Strings they represent.
* <p/>
* That is, the result equals <code>this.label.compareTo(o.label)</code>.
*
* {@inheritDoc}
*/
@Override
public int compareTo(ClassLabel o) {
SimpleClassLabel other = (SimpleClassLabel) o;
return this.label.compareTo(other.label);
}
/**
* The hash code of a simple class label is the hash code of the String
* represented by the ClassLabel.
*
* {@inheritDoc}
*/
@Override
public int hashCode() {
return label.hashCode();
}
/**
* Any ClassLabel should ensure a natural ordering that is consistent with
* equals. Thus, if <code>this.compareTo(o)==0</code>, then
* <code>this.equals(o)</code> should be <code>true</code>.
*
* @param o an object to test for equality w.r.t. this ClassLabel
* @return true, if <code>this==obj || this.compareTo(o)==0</code>, false
* otherwise
*/
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
if (!super.equals(o)) {
return false;
}
final SimpleClassLabel that = (SimpleClassLabel) o;
return label.equals(that.label);
}
/**
* Returns a new instance of the String covered by this SimpleClassLabel.
*
* @return a new instance of the String covered by this SimpleClassLabel
*/
@Override
public String toString() {
return label;
}
/**
* Serialization class.
*
* @author Erich Schubert
*
* @apiviz.uses SimpleClassLabel - - «serializes»
*/
public static class Serializer implements ByteBufferSerializer<SimpleClassLabel> {
@Override
public SimpleClassLabel fromByteBuffer(ByteBuffer buffer) throws IOException {
return new SimpleClassLabel(ByteArrayUtil.STRING_SERIALIZER.fromByteBuffer(buffer));
}
@Override
public void toByteBuffer(ByteBuffer buffer, SimpleClassLabel object) throws IOException {
ByteArrayUtil.STRING_SERIALIZER.toByteBuffer(buffer, object.label);
}
@Override
public int getByteSize(SimpleClassLabel object) throws IOException {
return ByteArrayUtil.STRING_SERIALIZER.getByteSize(object.label);
}
}
/**
* Factory class.
*
* @author Erich Schubert
*
* @apiviz.has SimpleClassLabel - - «creates»
* @apiviz.stereotype factory
*/
public static class Factory extends ClassLabel.Factory<SimpleClassLabel> {
@Override
public SimpleClassLabel makeFromString(String lbl) {
lbl = lbl.intern();
SimpleClassLabel l = existing.get(lbl);
if (l == null) {
l = new SimpleClassLabel(lbl);
existing.put(lbl, l);
}
return l;
}
@Override
public SimpleTypeInformation<? super SimpleClassLabel> getTypeInformation() {
return TypeUtil.SIMPLE_CLASSLABEL;
}
}
}
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