package com.dbxml.db.common.query;
/*
* dbXML - Native XML Database
* Copyright (c) 1999-2006 The dbXML Group, L.L.C.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* $Id: ResultSetBase.java,v 1.3 2006/02/02 18:53:52 bradford Exp $
*/
import com.dbxml.db.core.Collection;
import com.dbxml.db.core.data.Key;
import com.dbxml.db.core.query.ProcessingException;
import com.dbxml.db.core.query.Query;
import com.dbxml.db.core.query.QueryException;
import com.dbxml.db.core.query.ResultSet;
import com.dbxml.db.core.transaction.Transaction;
import com.dbxml.xml.SymbolTable;
/**
* ResultSetBase
*/
public abstract class ResultSetBase implements ResultSet {
protected Collection context;
protected Query query;
protected Transaction tx;
protected Key[] keySet;
protected Key currentKey;
protected int keyPos;
protected SymbolTable symbols;
protected boolean opened;
public ResultSetBase(Transaction tx, Collection context, Query query, Key[] keySet) {
this.tx = tx;
this.context = context;
this.query = query;
this.keySet = keySet;
opened = keySet != null;
try {
symbols = context.getSymbols();
}
catch ( Exception e ) {
// Should never happen
}
}
protected void checkOpened() throws QueryException {
if ( keySet == null )
throw new ProcessingException("No results");
if ( !opened )
throw new ProcessingException("ResultSet is not opened");
}
public Collection getCollection() {
return context;
}
public Query getQuery() {
return query;
}
public int getCount() throws QueryException {
checkOpened();
return keySet.length;
}
public Collection getResultCollection() throws QueryException {
checkOpened();
return context;
}
public Key getResultKey() throws QueryException {
checkOpened();
return currentKey;
}
protected Key nextKey() {
if ( keyPos < keySet.length )
currentKey = keySet[keyPos++];
else
currentKey = null;
return currentKey;
}
public void close() {
opened = false;
}
}