/*
* 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.graph;
/**
An interface for expressing a stopping condition on triples, such as in
sub-graph extraction.
*/
public interface TripleBoundary
{
/**
Answer true if this triple is a stopping triple, and whatever search is using
this interface should proceed no further.
*/
boolean stopAt( Triple t );
/**
A TripleBoundary without limits - stopAt always returns false.
*/
public static final TripleBoundary stopNowhere = new TripleBoundary()
{ @Override
public boolean stopAt( Triple t ) { return false; } };
/**
A TripleBoundary that stops at triples with anonymous objects.
*/
public static final TripleBoundary stopAtAnonObject = new TripleBoundary()
{ @Override
public boolean stopAt( Triple t ) { return t.getObject().isBlank(); } };
}