package com.sleepycat.bind.tuple;
import com.sleepycat.bind.EntityBinding;
import com.sleepycat.je.DatabaseEntry;
import de.ovgu.cide.jakutil.*;
/**
* An abstract <code>EntityBinding</code> that treats an entity's key entry
* and data entry as tuples.
* <p>
* This class takes care of converting the entries to/from {@link TupleInput}and {@link TupleOutput} objects. Its three abstract methods must be
* implemented by a concrete subclass to convert between tuples and entity
* objects.
* </p>
* <ul>
* <li> {@link #entryToObject(TupleInput,TupleInput)} </li>
* <li> {@link #objectToKey(Object,TupleOutput)} </li>
* <li> {@link #objectToData(Object,TupleOutput)} </li>
* </ul>
* @author Mark Hayes
*/
public abstract class TupleTupleBinding extends TupleBase implements EntityBinding {
/**
* Creates a tuple-tuple entity binding.
*/
public TupleTupleBinding(){
}
public Object entryToObject( DatabaseEntry key, DatabaseEntry data){
return entryToObject(TupleBinding.entryToInput(key),TupleBinding.entryToInput(data));
}
public void objectToKey( Object object, DatabaseEntry key){
TupleOutput output=getTupleOutput(object);
objectToKey(object,output);
outputToEntry(output,key);
}
public void objectToData( Object object, DatabaseEntry data){
TupleOutput output=getTupleOutput(object);
objectToData(object,output);
outputToEntry(output,data);
}
/**
* Constructs an entity object from {@link TupleInput} key and data entries.
* @param keyInputis the {@link TupleInput} key entry object.
* @param dataInputis the {@link TupleInput} data entry object.
* @return the entity object constructed from the key and data.
*/
public abstract Object entryToObject( TupleInput keyInput, TupleInput dataInput);
/**
* Extracts a key tuple from an entity object.
* @param objectis the entity object.
* @param outputis the {@link TupleOutput} to which the key should be written.
*/
public abstract void objectToKey( Object object, TupleOutput output);
/**
* Extracts a key tuple from an entity object.
* @param objectis the entity object.
* @param outputis the {@link TupleOutput} to which the data should be
* written.
*/
public abstract void objectToData( Object object, TupleOutput output);
}