/*
QueryDeRefNode.java
Created: 28 August 2004
Module By: Jonathan Abbey, jonabbey@arlut.utexas.edu
-----------------------------------------------------------------------
Ganymede Directory Management System
Copyright (C) 1996-2014
The University of Texas at Austin
Ganymede is a registered trademark of The University of Texas at Austin
Contact information
Author Email: ganymede_author@arlut.utexas.edu
Email mailing list: ganymede@arlut.utexas.edu
US Mail:
Computer Science Division
Applied Research Laboratories
The University of Texas at Austin
PO Box 8029, Austin TX 78713-8029
Telephone: (512) 835-3200
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package arlut.csd.ganymede.common;
/*------------------------------------------------------------------------------
class
QueryDeRefNode
------------------------------------------------------------------------------*/
/**
* <p>This class is used to represent a linked Query in a Query tree.
* A QueryDeRefNode is matched against an Invid field, and the QueryNode
* tree carried by the QueryDeRefNode is then evaluated against each
* DBObject pointed to through the Invid field.</p>
*/
public class QueryDeRefNode extends QueryNode {
static final long serialVersionUID = -8079273845295495744L;
// ---
public String fieldname;
public short fieldId;
public QueryNode queryTree;
/* -- */
/**
* Named field deref constructor.
*/
public QueryDeRefNode(String fieldname, QueryNode tree)
{
this.fieldname = fieldname;
this.fieldId = -1;
this.queryTree = tree;
}
/**
* Numbered field deref constructor.
*/
public QueryDeRefNode(short fieldid, QueryNode tree)
{
this.fieldId = fieldid;
this.fieldname = null;
this.queryTree = tree;
}
/**
* Diagnostic aid.
*/
public String toString()
{
return this.toString(null);
}
public String toString(Query query)
{
StringBuilder result = new StringBuilder();
if (fieldname != null)
{
result.append(fieldname);
}
else
{
if (query != null)
{
result.append(query.describeField(fieldId));
}
else
{
result.append("<");
result.append(String.valueOf(fieldId));
result.append(">");
}
}
result.append("->");
if (queryTree != null)
{
result.append(queryTree.toString(null));
}
return result.toString();
}
}