/*
* 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.enhanced.test;
import org.apache.jena.enhanced.* ;
import org.apache.jena.graph.* ;
import org.apache.jena.rdf.model.RDFNode ;
/**
* See {@link TestObject} for more detailed documentation.
*/
public class TestObjectImpl extends TestCommonImpl implements TestObject {
/** The required field is the factory field, of
* class Implementation.
* This tells how to construct a new EnhNode of this typ
* from a Node. Note that caching has already happened, so
* there is no point in implementing another cache here.
*/
public static final Implementation factory = new Implementation()
{
/** This method should probably always just call a constructor.
Note the constructor can/should be private.
*/
@Override public EnhNode wrap(Node n,EnhGraph eg)
{ return new TestObjectImpl(n,eg); }
@Override public boolean canWrap( Node n, EnhGraph eg )
{ return true; }
};
/** Creates a new instance of TestAllImpl */
private TestObjectImpl(Node n,EnhGraph eg) {
super( n, eg );
}
@Override public <X extends RDFNode> boolean supports( Class<X> t )
{ return t.isInstance( this ) && isObject(); }
@Override
public boolean isObject() {
return findObject() != null;
}
/**
* The code first checks that the interface is appropriate at this point.
* This is not obligatory but should be considered.
* (If the underlying graph has changed for the worse will
* users prefer an early and unambiguous exception at this point).
*
* @see org.apache.jena.enhanced.test.TestObject#aSubject()
*/
@Override
public TestSubject aSubject() {
if (!isObject())
throw new IllegalStateException("Node is not the object of a triple.");
return enhGraph.getNodeAs(findObject().getSubject(),TestSubject.class);
}
}