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/*******************************************************************************
* Copyright (c) 2010-2017, Zoltan Ujhelyi, IncQuery Labs Ltd.
* 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.localsearch.operations.util;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.Function;
import java.util.stream.Collectors;
import tools.refinery.viatra.runtime.localsearch.matcher.CallWithAdornment;
import tools.refinery.viatra.runtime.localsearch.matcher.MatcherReference;
import tools.refinery.viatra.runtime.matchers.psystem.IQueryReference;
import tools.refinery.viatra.runtime.matchers.psystem.PVariable;
import tools.refinery.viatra.runtime.matchers.psystem.basicdeferred.PatternCallBasedDeferred;
import tools.refinery.viatra.runtime.matchers.psystem.basicenumerables.BinaryReflexiveTransitiveClosure;
import tools.refinery.viatra.runtime.matchers.psystem.basicenumerables.BinaryTransitiveClosure;
import tools.refinery.viatra.runtime.matchers.psystem.basicenumerables.PositivePatternCall;
import tools.refinery.viatra.runtime.matchers.psystem.queries.PParameter;
import tools.refinery.viatra.runtime.matchers.psystem.queries.PQuery;
import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
import tools.refinery.viatra.runtime.matchers.tuple.TupleMask;
/**
* This class stores a precompiled version of call-related metadata and masks for local search operations
*
* @author Zoltan Ujhelyi
* @since 1.7
*/
public final class CallInformation {
private final TupleMask fullFrameMask;
private final TupleMask thinFrameMask;
private final TupleMask parameterMask;
private final int[] freeParameterIndices;
private final Map<PParameter, Integer> mapping = new HashMap<>();
private final Set<PParameter> adornment = new HashSet<>();
private final PQuery referredQuery;
private final MatcherReference matcherReference;
private final IQueryReference call;
private CallWithAdornment callWithAdornment;
public static CallInformation create(PatternCallBasedDeferred constraint, Map<PVariable, Integer> variableMapping, Set<Integer> bindings) {
return new CallInformation(constraint.getActualParametersTuple(), constraint, bindings, variableMapping);
}
public static CallInformation create(PositivePatternCall pCall, Map<PVariable, Integer> variableMapping, Set<Integer> bindings) {
return new CallInformation(pCall.getVariablesTuple(), pCall, bindings, variableMapping);
}
public static CallInformation create(BinaryTransitiveClosure constraint, Map<PVariable, Integer> variableMapping, Set<Integer> bindings) {
return new CallInformation(constraint.getVariablesTuple(), constraint, bindings, variableMapping);
}
/**
* @since 2.0
*/
public static CallInformation create(BinaryReflexiveTransitiveClosure constraint, Map<PVariable, Integer> variableMapping, Set<Integer> bindings) {
return new CallInformation(constraint.getVariablesTuple(), constraint, bindings, variableMapping);
}
private CallInformation(Tuple actualParameters, IQueryReference call, final Set<Integer> bindings,
Map<PVariable, Integer> variableMapping) {
this.call = call;
this.referredQuery = call.getReferredQuery();
int keySize = actualParameters.getSize();
List<Integer> parameterMaskIndices = new ArrayList<>();
int[] fullParameterMaskIndices = new int[keySize];
for (int i = 0; i < keySize; i++) {
PParameter symbolicParameter = referredQuery.getParameters().get(i);
PVariable parameter = (PVariable) actualParameters.get(i);
Integer originalFrameIndex = variableMapping.get(parameter);
mapping.put(symbolicParameter, originalFrameIndex);
fullParameterMaskIndices[i] = originalFrameIndex;
if (bindings.contains(originalFrameIndex)) {
parameterMaskIndices.add(originalFrameIndex);
adornment.add(symbolicParameter);
}
}
thinFrameMask = TupleMask.fromSelectedIndices(variableMapping.size(), parameterMaskIndices);
fullFrameMask = TupleMask.fromSelectedIndices(variableMapping.size(), fullParameterMaskIndices);
// This second iteration is necessary as we don't know beforehand the number of bound parameters
int[] boundParameterIndices = new int[adornment.size()];
int boundIndex = 0;
freeParameterIndices = new int[keySize - adornment.size()];
int freeIndex = 0;
for (int i = 0; i < keySize; i++) {
if (bindings.contains(variableMapping.get(actualParameters.get(i)))) {
boundParameterIndices[boundIndex] = i;
boundIndex++;
} else {
freeParameterIndices[freeIndex] = i;
freeIndex++;
}
}
parameterMask = TupleMask.fromSelectedIndices(keySize, boundParameterIndices);
callWithAdornment = new CallWithAdornment(call, adornment);
matcherReference = callWithAdornment.getMatcherReference();
}
/**
* Returns a mask describing how the bound variables of a Matching Frame are mapped to parameter indexes
*/
public TupleMask getThinFrameMask() {
return thinFrameMask;
}
/**
* Returns a mask describing how all variables of a Matching Frame are mapped to parameter indexes
*/
public TupleMask getFullFrameMask() {
return fullFrameMask;
}
/**
* Returns a mask describing the adornment the called pattern uses
*/
public TupleMask getParameterMask() {
return parameterMask;
}
public MatcherReference getReference() {
return matcherReference;
}
/**
* @since 2.1
*/
public IQueryReference getCall() {
return call;
}
/**
* @since 2.1
*/
public CallWithAdornment getCallWithAdornment() {
return callWithAdornment;
}
/**
* Returns the parameter indices that are unbound before the call
*/
public int[] getFreeParameterIndices() {
return freeParameterIndices;
}
public List<Integer> getVariablePositions() {
List<Integer> variables = new ArrayList<>(mapping.size());
for(PParameter p : referredQuery.getParameters()){
variables.add(mapping.get(p));
}
return variables;
}
@Override
public String toString() {
return toString(Object::toString);
}
/**
* @since 2.0
*/
public String toString(Function<Integer, String> variableMapping) {
return referredQuery.getFullyQualifiedName() + "("
+ referredQuery.getParameters().stream().map(
input -> (adornment.contains(input) ? "+" : "-") + variableMapping.apply(mapping.get(input)))
.collect(Collectors.joining(","))
+ ")";
}
}
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