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package de.lmu.ifi.dbs.elki.index.tree;
/*
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.io.ObjectInput;
import java.io.ObjectOutput;
/**
* Abstract superclass for entries in an tree based index structure.
*
* @author Elke Achtert
*/
public abstract class AbstractDirectoryEntry implements DirectoryEntry {
/**
* Holds the id of the object (node or data object) represented by this entry.
*/
private Integer id;
/**
* Empty constructor for serialization purposes.
*/
public AbstractDirectoryEntry() {
// empty constructor
}
/**
* Provides a new AbstractEntry with the specified id.
*
* @param id the id of the object (node or data object) represented by this
* entry.
*/
protected AbstractDirectoryEntry(Integer id) {
this.id = id;
}
@Override
public final boolean isLeafEntry() {
return false;
}
/**
* Returns the id of the node or data object that is represented by this
* entry.
*
* @return the id of the node or data object that is represented by this entry
*/
@Override
public final Integer getPageID() {
return id;
}
/**
* Returns the id of the node or data object that is represented by this
* entry.
*
* @return the id of the node or data object that is represented by this entry
*/
@Override
public final Integer getEntryID() {
return id;
}
/**
* Sets the id of the node or data object that is represented by this entry.
*
* @param id the id to be set
*/
// Should be set by the constructor, then final.
/*public final void setPageID(Integer id) {
this.id = id;
}*/
/**
* Writes the id of the object (node or data object) that is represented by
* this entry to the specified stream.
*/
@Override
public void writeExternal(ObjectOutput out) throws IOException {
out.writeInt(id);
}
/**
* Restores the id of the object (node or data object) that is represented by
* this entry from the specified stream.
*
* @throws ClassNotFoundException If the class for an object being restored
* cannot be found.
*/
@Override
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
this.id = in.readInt();
}
/**
* Indicates whether some other object is "equal to" this one.
*
* @param o the object to be tested
* @return true, if o is an AbstractEntry and has the same id as this entry.
*/
@Override
public boolean equals(Object o) {
if(this == o) {
return true;
}
if(o == null || getClass() != o.getClass()) {
return false;
}
final AbstractDirectoryEntry that = (AbstractDirectoryEntry) o;
return id == that.id;
}
/**
* Returns as hash code for the entry its id.
*
* @return the id of the entry
*/
@Override
public int hashCode() {
return id;
}
/**
* Returns the id as a string representation of this entry.
*
* @return a string representation of this entry
*/
@Override
public String toString() {
return "n_" + id;
}
}
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