/*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is the Kowari Metadata Store.
*
* The Initial Developer of the Original Code is Plugged In Software Pty
* Ltd (http://www.pisoftware.com, mailto:info@pisoftware.com). Portions
* created by Plugged In Software Pty Ltd are Copyright (C) 2001,2002
* Plugged In Software Pty Ltd. All Rights Reserved.
*
* Contributor(s):
* The copywrite in this file is held by:
* The Australian Commonwealth Government
* Department of Defense
* Developed by Netymon Pty Ltd
* under contract 4500430665
* contributed to the Mulgara Project under the
* Mozilla Public License version 1.1
* per clause 4.1.3 of the above contract.
*
* [NOTE: The text of this Exhibit A may differ slightly from the text
* of the notices in the Source Code files of the Original Code. You
* should use the text of this Exhibit A rather than the text found in the
* Original Code Source Code for Your Modifications.]
*
*/
package org.mulgara.resolver;
// Java 2 standard packages
// Java 2 enterprise packages
// Third party packages
import org.apache.log4j.Logger;
// Local packages
import org.mulgara.query.Constraint;
import org.mulgara.query.ConstraintElement;
import org.mulgara.query.ConstraintExpression;
import org.mulgara.query.GraphExpression;
import org.mulgara.resolver.spi.ConstraintDescriptor;
import org.mulgara.resolver.spi.ConstraintGraphRewrite;
import org.mulgara.resolver.spi.ConstraintResolutionHandler;
import org.mulgara.resolver.spi.QueryEvaluationContext;
import org.mulgara.store.tuples.Tuples;
/**
* A {@link ConstraintDescriptor} that aggregates the various handlers.
*
* @created 2005-05-03
* @author <a href="http://netymon.com/people/staff/andrae">Andrae Muys</a>
* @version $Revision: 1.1 $
* @modified $Date: 2005/05/03 08:09:08 $ by $Author: amuys $
* @maintenanceAuthor $Author: amuys $
* @copyright ©2005 <a href="http://www.defence.gov.au/">
* Australian Commonwealth Government, Department of Defence</a>
* @licence <a href="{@docRoot}/../../LICENCE">Mozilla Public License v1.1</a>
*/
class PrimitiveConstraintDescriptor implements ConstraintDescriptor {
/** Logger. */
@SuppressWarnings("unused")
private static final Logger logger = Logger.getLogger(PrimitiveConstraintDescriptor.class.getName());
private Class<? extends Constraint> constraintClass;
private ConstraintResolutionHandler resolutionHandler;
private ConstraintGraphRewrite rewriteHandler;
/**
* @param constraintClass the class of the constraint described
* @param resolutionHandler the resolutionHandler for the constraint or
* null if resolution is an error.
* @param rewriteHandler the modelRewrite Handler for the constraint or
* null if rewriting is an error.
* @throws IllegalArgumentException if <var>constraintClass</var> is <code>null</code>
*/
PrimitiveConstraintDescriptor(Class<? extends Constraint> constraintClass,
ConstraintResolutionHandler resolutionHandler, ConstraintGraphRewrite rewriteHandler) {
// Validate parameters
if (!ConstraintExpression.class.isAssignableFrom(constraintClass)) {
throw new IllegalArgumentException("'constraintClass' not a ConstraintExpression");
}
this.constraintClass = constraintClass;
this.resolutionHandler = resolutionHandler;
this.rewriteHandler = rewriteHandler;
}
public Class<? extends Constraint> getConstraintClass() {
return constraintClass;
}
public Constraint rewrite(ConstraintElement newModel, Constraint constraint) throws Exception {
if (rewriteHandler == null) {
throw new IllegalStateException("Attempt to rewrite model for " + constraintClass + " no handler registered");
}
return rewriteHandler.rewrite(newModel, constraint);
}
public Tuples resolve(QueryEvaluationContext context, GraphExpression modelExpr, ConstraintExpression constraintExpr) throws Exception {
if (rewriteHandler == null) {
throw new IllegalStateException("Attempt to resolve model for " + constraintClass + " no handler registered");
}
return resolutionHandler.resolve(context, modelExpr, constraintExpr);
}
}