/*---------------- FILE HEADER ------------------------------------------
This file is part of deegree.
Copyright (C) 2001-2006 by:
EXSE, Department of Geography, University of Bonn
http://www.giub.uni-bonn.de/deegree/
lat/lon GmbH
http://www.lat-lon.de
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Contact:
Andreas Poth
lat/lon GmbH
Aennchenstr. 19
53115 Bonn
Germany
E-Mail: poth@lat-lon.de
Prof. Dr. Klaus Greve
Department of Geography
University of Bonn
Meckenheimer Allee 166
53115 Bonn
Germany
E-Mail: greve@giub.uni-bonn.de
---------------------------------------------------------------------------*/
package org.deegree.model.filterencoding;
import org.w3c.dom.Element;
/**
* Abstract superclass representing spatial_ops, comparison_ops and logical_ops
* entities (as defined in the Filter DTD).
* The three different types are reflected in SpatialOperation,
* ComparisonOperation and LogicalOperation classes.
* @author Markus Schneider
* @version 10.08.2002
*/
public abstract class AbstractOperation implements Operation {
/**
* The underlying operator's id.
* @see OperationDefines
*/
protected int operatorId;
AbstractOperation(int operatorId)
{
this.operatorId = operatorId;
}
/**
* Given a DOM-fragment, a corresponding Operation-object is built. This method
* recursively calls other buildFromDOM () - methods to validate the structure
* of the DOM-fragment.
* @throws FilterConstructionException if the structure of the DOM-fragment is invalid
*/
public static Operation buildFromDOM (Element element)
throws FilterConstructionException {
// check if root element's name is a known operator
String name = element.getLocalName();
int type = OperationDefines.getTypeByName (name);
Operation operation = null;
switch (type) {
case OperationDefines.TYPE_SPATIAL: {
operation = SpatialOperation.buildFromDOM (element);
break;
}
case OperationDefines.TYPE_COMPARISON: {
operation = ComparisonOperation.buildFromDOM (element);
break;
}
case OperationDefines.TYPE_LOGICAL: {
operation = LogicalOperation.buildFromDOM (element);
break;
}
default: {
throw new FilterConstructionException ("Unknown operator '" + name + "'!");
}
}
return operation;
}
/** Returns the name of the operator. */
public String getOperatorName () {
return OperationDefines.getNameById (operatorId);
}
/**
* Returns the operator's id.
* @see OperationDefines
*
* @uml.property name="operatorId"
*/
public int getOperatorId() {
return operatorId;
}
}
/* ********************************************************************
Changes to this class. What the people have been up to:
$Log: AbstractOperation.java,v $
Revision 1.6 2006/07/12 14:46:14 poth
comment footer added
********************************************************************** */