1 files changed, 714 insertions, 0 deletions
diff --git a/Tests/ca.mcgill.ecse.dslreasoner.standalone.test/src-gen/ca/mcgill/ecse/dslreasoner/standalone/test/yakindu/queries/TwoSynch.java b/Tests/ca.mcgill.ecse.dslreasoner.standalone.test/src-gen/ca/mcgill/ecse/dslreasoner/standalone/test/yakindu/queries/TwoSynch.java
new file mode 100644
index 00000000..4595f6bc
--- /dev/null
+++ b/Tests/ca.mcgill.ecse.dslreasoner.standalone.test/src-gen/ca/mcgill/ecse/dslreasoner/standalone/test/yakindu/queries/TwoSynch.java
@@ -0,0 +1,714 @@
+/**
+ * Generated from platform:/resource/ca.mcgill.ecse.dslreasoner.standalone.test/queries/ca/mcgill/ecse/dslreasoner/standalone/test/yakindu/queries/yakinduPatterns.vql
+ */
+package ca.mcgill.ecse.dslreasoner.standalone.test.yakindu.queries;
+import ca.mcgill.ecse.dslreasoner.standalone.test.yakindu.Synchronization;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+import org.apache.log4j.Logger;
+import org.eclipse.emf.ecore.EClass;
+import org.eclipse.viatra.query.runtime.api.IPatternMatch;
+import org.eclipse.viatra.query.runtime.api.IQuerySpecification;
+import org.eclipse.viatra.query.runtime.api.ViatraQueryEngine;
+import org.eclipse.viatra.query.runtime.api.impl.BaseGeneratedEMFPQuery;
+import org.eclipse.viatra.query.runtime.api.impl.BaseGeneratedEMFQuerySpecification;
+import org.eclipse.viatra.query.runtime.api.impl.BaseMatcher;
+import org.eclipse.viatra.query.runtime.api.impl.BasePatternMatch;
+import org.eclipse.viatra.query.runtime.emf.types.EClassTransitiveInstancesKey;
+import org.eclipse.viatra.query.runtime.matchers.backend.QueryEvaluationHint;
+import org.eclipse.viatra.query.runtime.matchers.psystem.PBody;
+import org.eclipse.viatra.query.runtime.matchers.psystem.PVariable;
+import org.eclipse.viatra.query.runtime.matchers.psystem.annotations.PAnnotation;
+import org.eclipse.viatra.query.runtime.matchers.psystem.annotations.ParameterReference;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.ExportedParameter;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.Inequality;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicenumerables.TypeConstraint;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PParameter;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PParameterDirection;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PVisibility;
+import org.eclipse.viatra.query.runtime.matchers.tuple.Tuple;
+import org.eclipse.viatra.query.runtime.matchers.tuple.Tuples;
+import org.eclipse.viatra.query.runtime.util.ViatraQueryLoggingUtil;
+/**
+ * A pattern-specific query specification that can instantiate Matcher in a type-safe way.
+ * 
+ * <p>Original source:
+ *         <code><pre>
+ *         Simplifying model generation
+ *          
+ *         {@literal @}Constraint(severity="error", message="error", key = {s1,s2})
+ *         pattern twoSynch(s1 : Synchronization, s2 : Synchronization) {
+ *              Synchronization(s1);
+ *              Synchronization(s2);
+ *              s1 != s2;
+ *         }
+ * </pre></code>
+ * 
+ * @see Matcher
+ * @see Match
+ * 
+ */
+@SuppressWarnings("all")
+public final class TwoSynch extends BaseGeneratedEMFQuerySpecification<TwoSynch.Matcher> {
+  /**
+   * Pattern-specific match representation of the ca.mcgill.ecse.dslreasoner.standalone.test.yakindu.queries.twoSynch pattern,
+   * to be used in conjunction with {@link Matcher}.
+   * 
+   * <p>Class fields correspond to parameters of the pattern. Fields with value null are considered unassigned.
+   * Each instance is a (possibly partial) substitution of pattern parameters,
+   * usable to represent a match of the pattern in the result of a query,
+   * or to specify the bound (fixed) input parameters when issuing a query.
+   * 
+   * @see Matcher
+   * 
+   */
+  public static abstract class Match extends BasePatternMatch {
+    private Synchronization fS1;
+    
+    private Synchronization fS2;
+    
+    private static List<String> parameterNames = makeImmutableList("s1", "s2");
+    
+    private Match(final Synchronization pS1, final Synchronization pS2) {
+      this.fS1 = pS1;
+      this.fS2 = pS2;
+    }
+    
+    @Override
+    public Object get(final String parameterName) {
+      if ("s1".equals(parameterName)) return this.fS1;
+      if ("s2".equals(parameterName)) return this.fS2;
+      return null;
+    }
+    
+    public Synchronization getS1() {
+      return this.fS1;
+    }
+    
+    public Synchronization getS2() {
+      return this.fS2;
+    }
+    
+    @Override
+    public boolean set(final String parameterName, final Object newValue) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      if ("s1".equals(parameterName) ) {
+          this.fS1 = (Synchronization) newValue;
+          return true;
+      }
+      if ("s2".equals(parameterName) ) {
+          this.fS2 = (Synchronization) newValue;
+          return true;
+      }
+      return false;
+    }
+    
+    public void setS1(final Synchronization pS1) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fS1 = pS1;
+    }
+    
+    public void setS2(final Synchronization pS2) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fS2 = pS2;
+    }
+    
+    @Override
+    public String patternName() {
+      return "ca.mcgill.ecse.dslreasoner.standalone.test.yakindu.queries.twoSynch";
+    }
+    
+    @Override
+    public List<String> parameterNames() {
+      return TwoSynch.Match.parameterNames;
+    }
+    
+    @Override
+    public Object[] toArray() {
+      return new Object[]{fS1, fS2};
+    }
+    
+    @Override
+    public TwoSynch.Match toImmutable() {
+      return isMutable() ? newMatch(fS1, fS2) : this;
+    }
+    
+    @Override
+    public String prettyPrint() {
+      StringBuilder result = new StringBuilder();
+      result.append("\"s1\"=" + prettyPrintValue(fS1) + ", ");
+      result.append("\"s2\"=" + prettyPrintValue(fS2));
+      return result.toString();
+    }
+    
+    @Override
+    public int hashCode() {
+      return Objects.hash(fS1, fS2);
+    }
+    
+    @Override
+    public boolean equals(final Object obj) {
+      if (this == obj)
+          return true;
+      if (obj == null) {
+          return false;
+      }
+      if ((obj instanceof TwoSynch.Match)) {
+          TwoSynch.Match other = (TwoSynch.Match) obj;
+          return Objects.equals(fS1, other.fS1) && Objects.equals(fS2, other.fS2);
+      } else {
+          // this should be infrequent
+          if (!(obj instanceof IPatternMatch)) {
+              return false;
+          }
+          IPatternMatch otherSig  = (IPatternMatch) obj;
+          return Objects.equals(specification(), otherSig.specification()) && Arrays.deepEquals(toArray(), otherSig.toArray());
+      }
+    }
+    
+    @Override
+    public TwoSynch specification() {
+      return TwoSynch.instance();
+    }
+    
+    /**
+     * Returns an empty, mutable match.
+     * Fields of the mutable match can be filled to create a partial match, usable as matcher input.
+     * 
+     * @return the empty match.
+     * 
+     */
+    public static TwoSynch.Match newEmptyMatch() {
+      return new Mutable(null, null);
+    }
+    
+    /**
+     * Returns a mutable (partial) match.
+     * Fields of the mutable match can be filled to create a partial match, usable as matcher input.
+     * 
+     * @param pS1 the fixed value of pattern parameter s1, or null if not bound.
+     * @param pS2 the fixed value of pattern parameter s2, or null if not bound.
+     * @return the new, mutable (partial) match object.
+     * 
+     */
+    public static TwoSynch.Match newMutableMatch(final Synchronization pS1, final Synchronization pS2) {
+      return new Mutable(pS1, pS2);
+    }
+    
+    /**
+     * Returns a new (partial) match.
+     * This can be used e.g. to call the matcher with a partial match.
+     * <p>The returned match will be immutable. Use {@link #newEmptyMatch()} to obtain a mutable match object.
+     * @param pS1 the fixed value of pattern parameter s1, or null if not bound.
+     * @param pS2 the fixed value of pattern parameter s2, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public static TwoSynch.Match newMatch(final Synchronization pS1, final Synchronization pS2) {
+      return new Immutable(pS1, pS2);
+    }
+    
+    private static final class Mutable extends TwoSynch.Match {
+      Mutable(final Synchronization pS1, final Synchronization pS2) {
+        super(pS1, pS2);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return true;
+      }
+    }
+    
+    private static final class Immutable extends TwoSynch.Match {
+      Immutable(final Synchronization pS1, final Synchronization pS2) {
+        super(pS1, pS2);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return false;
+      }
+    }
+  }
+  
+  /**
+   * Generated pattern matcher API of the ca.mcgill.ecse.dslreasoner.standalone.test.yakindu.queries.twoSynch pattern,
+   * providing pattern-specific query methods.
+   * 
+   * <p>Use the pattern matcher on a given model via {@link #on(ViatraQueryEngine)},
+   * e.g. in conjunction with {@link ViatraQueryEngine#on(QueryScope)}.
+   * 
+   * <p>Matches of the pattern will be represented as {@link Match}.
+   * 
+   * <p>Original source:
+   * <code><pre>
+   * Simplifying model generation
+   *  
+   * {@literal @}Constraint(severity="error", message="error", key = {s1,s2})
+   * pattern twoSynch(s1 : Synchronization, s2 : Synchronization) {
+   *    Synchronization(s1);
+   *    Synchronization(s2);
+   *    s1 != s2;
+   * }
+   * </pre></code>
+   * 
+   * @see Match
+   * @see TwoSynch
+   * 
+   */
+  public static class Matcher extends BaseMatcher<TwoSynch.Match> {
+    /**
+     * Initializes the pattern matcher within an existing VIATRA Query engine.
+     * If the pattern matcher is already constructed in the engine, only a light-weight reference is returned.
+     * 
+     * @param engine the existing VIATRA Query engine in which this matcher will be created.
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * 
+     */
+    public static TwoSynch.Matcher on(final ViatraQueryEngine engine) {
+      // check if matcher already exists
+      Matcher matcher = engine.getExistingMatcher(querySpecification());
+      if (matcher == null) {
+          matcher = (Matcher)engine.getMatcher(querySpecification());
+      }
+      return matcher;
+    }
+    
+    /**
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * @return an initialized matcher
+     * @noreference This method is for internal matcher initialization by the framework, do not call it manually.
+     * 
+     */
+    public static TwoSynch.Matcher create() {
+      return new Matcher();
+    }
+    
+    private final static int POSITION_S1 = 0;
+    
+    private final static int POSITION_S2 = 1;
+    
+    private final static Logger LOGGER = ViatraQueryLoggingUtil.getLogger(TwoSynch.Matcher.class);
+    
+    /**
+     * Initializes the pattern matcher within an existing VIATRA Query engine.
+     * If the pattern matcher is already constructed in the engine, only a light-weight reference is returned.
+     * 
+     * @param engine the existing VIATRA Query engine in which this matcher will be created.
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * 
+     */
+    private Matcher() {
+      super(querySpecification());
+    }
+    
+    /**
+     * Returns the set of all matches of the pattern that conform to the given fixed values of some parameters.
+     * @param pS1 the fixed value of pattern parameter s1, or null if not bound.
+     * @param pS2 the fixed value of pattern parameter s2, or null if not bound.
+     * @return matches represented as a Match object.
+     * 
+     */
+    public Collection<TwoSynch.Match> getAllMatches(final Synchronization pS1, final Synchronization pS2) {
+      return rawStreamAllMatches(new Object[]{pS1, pS2}).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Returns a stream of all matches of the pattern that conform to the given fixed values of some parameters.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     * @param pS1 the fixed value of pattern parameter s1, or null if not bound.
+     * @param pS2 the fixed value of pattern parameter s2, or null if not bound.
+     * @return a stream of matches represented as a Match object.
+     * 
+     */
+    public Stream<TwoSynch.Match> streamAllMatches(final Synchronization pS1, final Synchronization pS2) {
+      return rawStreamAllMatches(new Object[]{pS1, pS2});
+    }
+    
+    /**
+     * Returns an arbitrarily chosen match of the pattern that conforms to the given fixed values of some parameters.
+     * Neither determinism nor randomness of selection is guaranteed.
+     * @param pS1 the fixed value of pattern parameter s1, or null if not bound.
+     * @param pS2 the fixed value of pattern parameter s2, or null if not bound.
+     * @return a match represented as a Match object, or null if no match is found.
+     * 
+     */
+    public Optional<TwoSynch.Match> getOneArbitraryMatch(final Synchronization pS1, final Synchronization pS2) {
+      return rawGetOneArbitraryMatch(new Object[]{pS1, pS2});
+    }
+    
+    /**
+     * Indicates whether the given combination of specified pattern parameters constitute a valid pattern match,
+     * under any possible substitution of the unspecified parameters (if any).
+     * @param pS1 the fixed value of pattern parameter s1, or null if not bound.
+     * @param pS2 the fixed value of pattern parameter s2, or null if not bound.
+     * @return true if the input is a valid (partial) match of the pattern.
+     * 
+     */
+    public boolean hasMatch(final Synchronization pS1, final Synchronization pS2) {
+      return rawHasMatch(new Object[]{pS1, pS2});
+    }
+    
+    /**
+     * Returns the number of all matches of the pattern that conform to the given fixed values of some parameters.
+     * @param pS1 the fixed value of pattern parameter s1, or null if not bound.
+     * @param pS2 the fixed value of pattern parameter s2, or null if not bound.
+     * @return the number of pattern matches found.
+     * 
+     */
+    public int countMatches(final Synchronization pS1, final Synchronization pS2) {
+      return rawCountMatches(new Object[]{pS1, pS2});
+    }
+    
+    /**
+     * Executes the given processor on an arbitrarily chosen match of the pattern that conforms to the given fixed values of some parameters.
+     * Neither determinism nor randomness of selection is guaranteed.
+     * @param pS1 the fixed value of pattern parameter s1, or null if not bound.
+     * @param pS2 the fixed value of pattern parameter s2, or null if not bound.
+     * @param processor the action that will process the selected match.
+     * @return true if the pattern has at least one match with the given parameter values, false if the processor was not invoked
+     * 
+     */
+    public boolean forOneArbitraryMatch(final Synchronization pS1, final Synchronization pS2, final Consumer<? super TwoSynch.Match> processor) {
+      return rawForOneArbitraryMatch(new Object[]{pS1, pS2}, processor);
+    }
+    
+    /**
+     * Returns a new (partial) match.
+     * This can be used e.g. to call the matcher with a partial match.
+     * <p>The returned match will be immutable. Use {@link #newEmptyMatch()} to obtain a mutable match object.
+     * @param pS1 the fixed value of pattern parameter s1, or null if not bound.
+     * @param pS2 the fixed value of pattern parameter s2, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public TwoSynch.Match newMatch(final Synchronization pS1, final Synchronization pS2) {
+      return TwoSynch.Match.newMatch(pS1, pS2);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for s1.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<Synchronization> rawStreamAllValuesOfs1(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_S1, parameters).map(Synchronization.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for s1.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<Synchronization> getAllValuesOfs1() {
+      return rawStreamAllValuesOfs1(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for s1.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<Synchronization> streamAllValuesOfs1() {
+      return rawStreamAllValuesOfs1(emptyArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for s1.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<Synchronization> streamAllValuesOfs1(final TwoSynch.Match partialMatch) {
+      return rawStreamAllValuesOfs1(partialMatch.toArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for s1.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<Synchronization> streamAllValuesOfs1(final Synchronization pS2) {
+      return rawStreamAllValuesOfs1(new Object[]{null, pS2});
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for s1.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<Synchronization> getAllValuesOfs1(final TwoSynch.Match partialMatch) {
+      return rawStreamAllValuesOfs1(partialMatch.toArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for s1.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<Synchronization> getAllValuesOfs1(final Synchronization pS2) {
+      return rawStreamAllValuesOfs1(new Object[]{null, pS2}).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for s2.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<Synchronization> rawStreamAllValuesOfs2(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_S2, parameters).map(Synchronization.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for s2.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<Synchronization> getAllValuesOfs2() {
+      return rawStreamAllValuesOfs2(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for s2.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<Synchronization> streamAllValuesOfs2() {
+      return rawStreamAllValuesOfs2(emptyArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for s2.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<Synchronization> streamAllValuesOfs2(final TwoSynch.Match partialMatch) {
+      return rawStreamAllValuesOfs2(partialMatch.toArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for s2.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<Synchronization> streamAllValuesOfs2(final Synchronization pS1) {
+      return rawStreamAllValuesOfs2(new Object[]{pS1, null});
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for s2.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<Synchronization> getAllValuesOfs2(final TwoSynch.Match partialMatch) {
+      return rawStreamAllValuesOfs2(partialMatch.toArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for s2.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<Synchronization> getAllValuesOfs2(final Synchronization pS1) {
+      return rawStreamAllValuesOfs2(new Object[]{pS1, null}).collect(Collectors.toSet());
+    }
+    
+    @Override
+    protected TwoSynch.Match tupleToMatch(final Tuple t) {
+      try {
+          return TwoSynch.Match.newMatch((Synchronization) t.get(POSITION_S1), (Synchronization) t.get(POSITION_S2));
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in tuple not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected TwoSynch.Match arrayToMatch(final Object[] match) {
+      try {
+          return TwoSynch.Match.newMatch((Synchronization) match[POSITION_S1], (Synchronization) match[POSITION_S2]);
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in array not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected TwoSynch.Match arrayToMatchMutable(final Object[] match) {
+      try {
+          return TwoSynch.Match.newMutableMatch((Synchronization) match[POSITION_S1], (Synchronization) match[POSITION_S2]);
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in array not properly typed!",e);
+          return null;
+      }
+    }
+    
+    /**
+     * @return the singleton instance of the query specification of this pattern
+     * @throws ViatraQueryRuntimeException if the pattern definition could not be loaded
+     * 
+     */
+    public static IQuerySpecification<TwoSynch.Matcher> querySpecification() {
+      return TwoSynch.instance();
+    }
+  }
+  
+  private TwoSynch() {
+    super(GeneratedPQuery.INSTANCE);
+  }
+  
+  /**
+   * @return the singleton instance of the query specification
+   * @throws ViatraQueryRuntimeException if the pattern definition could not be loaded
+   * 
+   */
+  public static TwoSynch instance() {
+    try{
+        return LazyHolder.INSTANCE;
+    } catch (ExceptionInInitializerError err) {
+        throw processInitializerError(err);
+    }
+  }
+  
+  @Override
+  protected TwoSynch.Matcher instantiate(final ViatraQueryEngine engine) {
+    return TwoSynch.Matcher.on(engine);
+  }
+  
+  @Override
+  public TwoSynch.Matcher instantiate() {
+    return TwoSynch.Matcher.create();
+  }
+  
+  @Override
+  public TwoSynch.Match newEmptyMatch() {
+    return TwoSynch.Match.newEmptyMatch();
+  }
+  
+  @Override
+  public TwoSynch.Match newMatch(final Object... parameters) {
+    return TwoSynch.Match.newMatch((ca.mcgill.ecse.dslreasoner.standalone.test.yakindu.Synchronization) parameters[0], (ca.mcgill.ecse.dslreasoner.standalone.test.yakindu.Synchronization) parameters[1]);
+  }
+  
+  /**
+   * Inner class allowing the singleton instance of {@link JvmGenericType: ca.mcgill.ecse.dslreasoner.standalone.test.yakindu.queries.TwoSynch (visibility: PUBLIC, simpleName: TwoSynch, identifier: ca.mcgill.ecse.dslreasoner.standalone.test.yakindu.queries.TwoSynch, deprecated: <unset>) (abstract: false, static: false, final: true, packageName: ca.mcgill.ecse.dslreasoner.standalone.test.yakindu.queries) (interface: false, strictFloatingPoint: false, anonymous: false)} to be created 
+   *     <b>not</b> at the class load time of the outer class, 
+   *     but rather at the first call to {@link JvmGenericType: ca.mcgill.ecse.dslreasoner.standalone.test.yakindu.queries.TwoSynch (visibility: PUBLIC, simpleName: TwoSynch, identifier: ca.mcgill.ecse.dslreasoner.standalone.test.yakindu.queries.TwoSynch, deprecated: <unset>) (abstract: false, static: false, final: true, packageName: ca.mcgill.ecse.dslreasoner.standalone.test.yakindu.queries) (interface: false, strictFloatingPoint: false, anonymous: false)#instance()}.
+   * 
+   * <p> This workaround is required e.g. to support recursion.
+   * 
+   */
+  private static class LazyHolder {
+    private final static TwoSynch INSTANCE = new TwoSynch();
+    
+    /**
+     * Statically initializes the query specification <b>after</b> the field {@link #INSTANCE} is assigned.
+     * This initialization order is required to support indirect recursion.
+     * 
+     * <p> The static initializer is defined using a helper field to work around limitations of the code generator.
+     * 
+     */
+    private final static Object STATIC_INITIALIZER = ensureInitialized();
+    
+    public static Object ensureInitialized() {
+      INSTANCE.ensureInitializedInternal();
+      return null;
+    }
+  }
+  
+  private static class GeneratedPQuery extends BaseGeneratedEMFPQuery {
+    private final static TwoSynch.GeneratedPQuery INSTANCE = new GeneratedPQuery();
+    
+    private final PParameter parameter_s1 = new PParameter("s1", "ca.mcgill.ecse.dslreasoner.standalone.test.yakindu.Synchronization", new EClassTransitiveInstancesKey((EClass)getClassifierLiteralSafe("YakinduMetamodel", "Synchronization")), PParameterDirection.INOUT);
+    
+    private final PParameter parameter_s2 = new PParameter("s2", "ca.mcgill.ecse.dslreasoner.standalone.test.yakindu.Synchronization", new EClassTransitiveInstancesKey((EClass)getClassifierLiteralSafe("YakinduMetamodel", "Synchronization")), PParameterDirection.INOUT);
+    
+    private final List<PParameter> parameters = Arrays.asList(parameter_s1, parameter_s2);
+    
+    private GeneratedPQuery() {
+      super(PVisibility.PUBLIC);
+    }
+    
+    @Override
+    public String getFullyQualifiedName() {
+      return "ca.mcgill.ecse.dslreasoner.standalone.test.yakindu.queries.twoSynch";
+    }
+    
+    @Override
+    public List<String> getParameterNames() {
+      return Arrays.asList("s1","s2");
+    }
+    
+    @Override
+    public List<PParameter> getParameters() {
+      return parameters;
+    }
+    
+    @Override
+    public Set<PBody> doGetContainedBodies() {
+      setEvaluationHints(new QueryEvaluationHint(null, QueryEvaluationHint.BackendRequirement.UNSPECIFIED));
+      Set<PBody> bodies = new LinkedHashSet<>();
+      {
+          PBody body = new PBody(this);
+          PVariable var_s1 = body.getOrCreateVariableByName("s1");
+          PVariable var_s2 = body.getOrCreateVariableByName("s2");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_s1), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("YakinduMetamodel", "Synchronization")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var_s2), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("YakinduMetamodel", "Synchronization")));
+          body.setSymbolicParameters(Arrays.<ExportedParameter>asList(
+             new ExportedParameter(body, var_s1, parameter_s1),
+             new ExportedParameter(body, var_s2, parameter_s2)
+          ));
+          //    Synchronization(s1)
+          new TypeConstraint(body, Tuples.flatTupleOf(var_s1), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("YakinduMetamodel", "Synchronization")));
+          //    Synchronization(s2)
+          new TypeConstraint(body, Tuples.flatTupleOf(var_s2), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("YakinduMetamodel", "Synchronization")));
+          //    s1 != s2
+          new Inequality(body, var_s1, var_s2);
+          bodies.add(body);
+      }
+      {
+          PAnnotation annotation = new PAnnotation("Constraint");
+          annotation.addAttribute("severity", "error");
+          annotation.addAttribute("message", "error");
+          annotation.addAttribute("key", Arrays.asList(new Object[] {
+                              new ParameterReference("s1"), 
+                              new ParameterReference("s2")
+                              }));
+          addAnnotation(annotation);
+      }
+      return bodies;
+    }
+  }
+}