/*
* LensKit, an open source recommender systems toolkit.
* Copyright 2010-2014 LensKit Contributors. See CONTRIBUTORS.md.
* Work on LensKit has been funded by the National Science Foundation under
* grants IIS 05-34939, 08-08692, 08-12148, and 10-17697.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.grouplens.lenskit.inject;
import org.grouplens.grapht.Component;
import org.grouplens.grapht.Dependency;
import org.grouplens.grapht.graph.DAGEdge;
import org.grouplens.grapht.graph.DAGNode;
import org.grouplens.grapht.graph.DAGNodeBuilder;
import org.grouplens.grapht.reflect.Satisfaction;
import org.grouplens.grapht.reflect.Satisfactions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Nonnull;
/**
* Node processor that simulates instantiation.
* @author <a href="http://www.grouplens.org">GroupLens Research</a>
*/
class SimulationNodeProcessor implements NodeProcessor {
private static final Logger logger = LoggerFactory.getLogger(SimulationNodeProcessor.class);
public DAGNode<Component, Dependency> processNode(@Nonnull DAGNode<Component, Dependency> node, @Nonnull DAGNode<Component, Dependency> original) {
Component label = node.getLabel();
if (!label.getSatisfaction().hasInstance()) {
Satisfaction instanceSat = Satisfactions.nullOfType(label.getSatisfaction().getErasedType());
Component newLbl = Component.create(instanceSat,
label.getCachePolicy());
// build new node with replacement label
DAGNodeBuilder<Component,Dependency> bld = DAGNode.newBuilder(newLbl);
// retain all non-transient edges
for (DAGEdge<Component,Dependency> edge: node.getOutgoingEdges()) {
if (!GraphtUtils.edgeIsTransient(edge)) {
bld.addEdge(edge.getTail(), edge.getLabel());
}
}
DAGNode<Component,Dependency> repl = bld.build();
logger.debug("simulating instantiation of {}", node);
return repl;
} else {
return node;
}
}
}