1 files changed, 118 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-localsearch/src/main/java/tools/refinery/viatra/runtime/localsearch/operations/extend/ExtendPositivePatternCall.java b/subprojects/viatra-runtime-localsearch/src/main/java/tools/refinery/viatra/runtime/localsearch/operations/extend/ExtendPositivePatternCall.java
new file mode 100644
index 00000000..690a3241
--- /dev/null
+++ b/subprojects/viatra-runtime-localsearch/src/main/java/tools/refinery/viatra/runtime/localsearch/operations/extend/ExtendPositivePatternCall.java
@@ -0,0 +1,118 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2016, Grill Balázs, IncQueryLabs
+ * 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.extend;
+
+import java.util.Iterator;
+import java.util.List;
+import java.util.function.Function;
+
+import tools.refinery.viatra.runtime.localsearch.MatchingFrame;
+import tools.refinery.viatra.runtime.localsearch.matcher.ISearchContext;
+import tools.refinery.viatra.runtime.localsearch.operations.ExtendOperationExecutor;
+import tools.refinery.viatra.runtime.localsearch.operations.IPatternMatcherOperation;
+import tools.refinery.viatra.runtime.localsearch.operations.ISearchOperation;
+import tools.refinery.viatra.runtime.localsearch.operations.util.CallInformation;
+import tools.refinery.viatra.runtime.matchers.backend.IQueryResultProvider;
+import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
+import tools.refinery.viatra.runtime.matchers.tuple.TupleMask;
+import tools.refinery.viatra.runtime.matchers.tuple.VolatileModifiableMaskedTuple;
+
+/**
+ * @author Grill Balázs
+ * @since 1.4
+ *
+ */
+public class ExtendPositivePatternCall implements ISearchOperation, IPatternMatcherOperation {
+
+    private class Executor extends ExtendOperationExecutor<Tuple> {
+        private final VolatileModifiableMaskedTuple maskedTuple;
+        
+        public Executor() {
+            maskedTuple = new VolatileModifiableMaskedTuple(information.getThinFrameMask());
+        }
+        
+        @Override
+        protected Iterator<? extends Tuple> getIterator(MatchingFrame frame, ISearchContext context) {
+            maskedTuple.updateTuple(frame);
+            IQueryResultProvider matcher = context.getMatcher(information.getCallWithAdornment());
+            return matcher.getAllMatches(information.getParameterMask(), maskedTuple).iterator();
+        }
+        
+        /**
+         * @since 2.0
+         */
+        @Override
+        protected boolean fillInValue(Tuple result, MatchingFrame frame, ISearchContext context) {
+            TupleMask mask = information.getFullFrameMask();
+            // The first loop clears out the elements from a possible previous iteration 
+            for(int i : information.getFreeParameterIndices()) {
+                mask.set(frame, i, null);
+            }
+            for(int i : information.getFreeParameterIndices()) {
+                Object oldValue = mask.getValue(frame, i);
+                Object valueToFill = result.get(i);
+                if (oldValue != null && !oldValue.equals(valueToFill)){
+                    // If the inverse map contains more than one values for the same key, it means that these arguments are unified by the caller. 
+                    // In this case if the callee assigns different values the frame shall be dropped
+                    return false;
+                }
+                mask.set(frame, i, valueToFill);
+            }
+            return true;
+        }
+        
+        @Override
+        protected void cleanup(MatchingFrame frame, ISearchContext context) {
+            TupleMask mask = information.getFullFrameMask();
+            for(int i : information.getFreeParameterIndices()){
+                mask.set(frame, i, null);
+            }
+            
+        }
+        
+        @Override
+        public ISearchOperation getOperation() {
+            return ExtendPositivePatternCall.this;
+        }
+    }
+    
+    private final CallInformation information; 
+    
+    /**
+     * @since 1.7
+     */
+    public ExtendPositivePatternCall(CallInformation information) {
+       this.information = information;
+    }
+    
+    @Override
+    public ISearchOperationExecutor createExecutor() {
+        return new Executor();
+    }
+
+    @Override
+    public List<Integer> getVariablePositions() {
+        return information.getVariablePositions();
+    }
+    
+    @Override
+    public String toString() {
+        return toString(Object::toString);
+    }
+    
+    @Override
+    public String toString(Function<Integer, String> variableMapping) {
+        return "extend find " + information.toString(variableMapping);
+    }
+    
+    @Override
+    public CallInformation getCallInformation() {
+        return information;
+    }
+}