add MergeRedundantAssocsTrafo

Author: Max Philip Stachon

cddiff/src/main/java/de/monticore/cddiff/ow2cw/MergeRedundantAssocsTrafo.java

@@ -0,0 +1,36 @@
+/* (c) https://github.com/MontiCore/monticore */
+package de.monticore.cddiff.ow2cw;
+
+import de.monticore.cdassociation._ast.ASTCDAssociation;
+import de.monticore.cdbasis._ast.ASTCDCompilationUnit;
+import de.monticore.cddiff.CDDiffUtil;
+
+import java.util.Set;
+import java.util.stream.Collectors;
+
+public class MergeRedundantAssocsTrafo {
+  
+  public void transform(ASTCDCompilationUnit cd) {
+    Set<ASTCDAssociation> assocs = CDDiffUtil.getAllAssocsFromCD(cd);
+    for (ASTCDAssociation assoc : assocs) {
+      Set<ASTCDAssociation> duplicates = assocs.stream().filter(duplicate -> isDuplicate(assoc,
+          duplicate)).collect(Collectors.toSet());
+      if (!duplicates.isEmpty()) {
+        duplicates.add(assoc);
+        assocs.removeAll(duplicates);
+        assocs.add(combineDuplicates(duplicates));
+      }
+    }
+  }
+  
+  private ASTCDAssociation combineDuplicates(Set<ASTCDAssociation> duplicates) {
+    assert false;
+    return null;
+  }
+  
+  private boolean isDuplicate(ASTCDAssociation assoc, ASTCDAssociation duplicate) {
+    assert false;
+    return false;
+  }
+  
+}