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/*******************************************************************************
* Copyright (c) 2010-2014, Zoltan Ujhelyi, Istvan Rath and Daniel Varro
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.matchers.psystem.rewriters;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.WeakHashMap;
import tools.refinery.viatra.runtime.matchers.psystem.queries.PDisjunction;
/**
* A rewriter that stores the previously computed results of a rewriter or a rewriter chain.
*
* @author Zoltan Ujhelyi
* @since 1.0
*/
public class PDisjunctionRewriterCacher extends PDisjunctionRewriter {
private final List<PDisjunctionRewriter> rewriterChain;
private WeakHashMap<PDisjunction, PDisjunction> cachedResults =
new WeakHashMap<PDisjunction, PDisjunction>();
private void setupTraceCollectorInChain(){
IRewriterTraceCollector collector = getTraceCollector();
for(PDisjunctionRewriter rewriter: rewriterChain){
rewriter.setTraceCollector(collector);
}
}
public PDisjunctionRewriterCacher(PDisjunctionRewriter rewriter) {
rewriterChain = Collections.singletonList(rewriter);
}
public PDisjunctionRewriterCacher(PDisjunctionRewriter... rewriters) {
rewriterChain = new ArrayList<>(Arrays.asList(rewriters));
}
public PDisjunctionRewriterCacher(List<PDisjunctionRewriter> rewriterChain) {
this.rewriterChain = new ArrayList<>(rewriterChain);
}
@Override
public PDisjunction rewrite(PDisjunction disjunction) {
if (!cachedResults.containsKey(disjunction)) {
PDisjunction rewritten = disjunction;
setupTraceCollectorInChain();
for (PDisjunctionRewriter rewriter : rewriterChain) {
rewritten = rewriter.rewrite(rewritten);
}
cachedResults.put(disjunction, rewritten);
}
return cachedResults.get(disjunction);
}
}
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