/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jena.fuseki.migrate;
import com.hp.hpl.jena.graph.BulkUpdateHandler;
import com.hp.hpl.jena.graph.Graph;
import com.hp.hpl.jena.graph.Triple;
import com.hp.hpl.jena.graph.impl.GraphWithPerform;
import com.hp.hpl.jena.graph.impl.WrappedGraph;
import com.hp.hpl.jena.shared.AddDeniedException;
public class LimitingGraph extends WrappedGraph implements GraphWithPerform
{
int limit = 10000 ;
int count = 0 ;
LimitingBulkUpdateHandler bulk ;
public LimitingGraph(Graph graph, int triplesLimit)
{
super(graph) ;
this.limit = triplesLimit ;
bulk = new LimitingBulkUpdateHandler(this, graph.getBulkUpdateHandler()) ;
}
@Override
public void add( Triple t ) throws AddDeniedException
{
count++ ;
checkSize() ;
super.add(t) ;
}
/** returns this Graph's bulk-update handler */
@Override
public BulkUpdateHandler getBulkUpdateHandler()
{
return bulk ;
}
void checkSize()
{
if ( count > limit )
throw new AddDeniedException("Attempt to exceed graph limit ("+limit+")") ;
}
}