/*
* 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.reasoner.rulesys.impl;
/**
* Base class for stack frame objects. Originally this was used to provide
* pool-based allocated but it turns out the normal Java GC outperforms
* manual pool-based allocation anyway.
*/
public class FrameObject {
/** Used to link the frame to the prior frame in the (tree) stack or the pool */
FrameObject link;
/**
* Link this frame to an existing frame. In the future this might do some ref count
* tricks.
*/
public void linkTo(FrameObject prior) {
link = prior;
}
/**
* Link this frame to an existing frame. This will never do any funny ref count tricks.
*/
public void fastLinkTo(FrameObject prior) {
link = prior;
}
/**
* Return the prior frame in the tree.
*/
public FrameObject getLink() {
return link;
}
/**
* Close the frame actively. This frees any internal resources, frees this frame and
* frees the frame to which this is linked.
*/
public void close() {
if (link != null) {
link.close();
}
}
}