#22 Add Verifier: Multiple Input data of the same input column

dmnverifierapi/src/main/java/de/unikoblenz/fgbks/core/dmn/verification/verifier/impl/MultipleInputDataVerifier.java

+package de.unikoblenz.fgbks.core.dmn.verification.verifier.impl;
+
+import static de.unikoblenz.fgbks.core.dmn.domain.vdmn.utils.VDmnFunctions.getColumnStringName;
+import static de.unikoblenz.fgbks.core.dmn.domain.vdmn.utils.VDmnFunctions.templateDecision;
+import static de.unikoblenz.fgbks.core.dmn.verification.result.actions.Action.ACTION_SHOW_DECISION;
+import static de.unikoblenz.fgbks.core.dmn.verification.result.actions.Action.ACTION_SHOW_INPUT_COLUMNS;
+import static de.unikoblenz.fgbks.core.dmn.verification.result.actions.Action.ACTION_SHOW_INPUT_DATA;
+import static de.unikoblenz.fgbks.core.dmn.verification.result.actions.VerificationFix.DEFAULT_SHOW_NAME;
+
+import de.unikoblenz.fgbks.base.domain.Name;
+import de.unikoblenz.fgbks.core.dmn.domain.vdmn.VDmnDecision;
+import de.unikoblenz.fgbks.core.dmn.domain.vdmn.VDmnInputColumn;
+import de.unikoblenz.fgbks.core.dmn.domain.vdmn.VDmnNode;
+import de.unikoblenz.fgbks.core.dmn.domain.vdmn.VDmnOutputColumn;
+import de.unikoblenz.fgbks.core.dmn.verification.result.VerificationResultEntry.VerificationClassification;
+import de.unikoblenz.fgbks.core.dmn.verification.result.VerificationResultEntryElement;
+import de.unikoblenz.fgbks.core.dmn.verification.result.actions.VerificationFix;
+import de.unikoblenz.fgbks.core.dmn.verification.verifier.AbstractVerifier;
+import de.unikoblenz.fgbks.core.dmn.verification.verifier.DmnVerifier;
+import de.unikoblenz.fgbks.core.dmn.verification.verifier.types.MultipleInputDataVerification;
+import java.util.ArrayList;
+import java.util.List;
+
+@DmnVerifier(verifierType = MultipleInputDataVerification.class)
+public class MultipleInputDataVerifier extends AbstractVerifier {
+
+  @Override
+  protected void doVerification() {
+    for (VDmnDecision decision : dmnObjectContainer.getVDmnDefinition().getDmnDecisions()) {
+      List<VDmnNode> inputNodes = decision.getDmnInformationRequirements();
+      // Check for each input column if there is more than one input data nodes or output columns
+      // from decision nodes
+      for (VDmnInputColumn inputColumn : decision.getDmnDecisionTable().getInputColumns()) {
+        checkMultipleInputData(inputColumn, inputNodes);
+      }
+    }
+  }
+
+  private void checkMultipleInputData(VDmnInputColumn inputColumn, List<VDmnNode> inputNodes) {
+    List<VDmnNode> matchingNodes = new ArrayList<>();
+    // if the inputColumn has no name, add the column
+    if (inputColumn.getName().isPresent()) {
+      // Counter
+      Name inputColumnName = inputColumn.getName().get();
+      // check, if there is one input Data with the same name
+      for (VDmnNode node : inputNodes) {
+        // input Data node, check only the name
+        if (node.isInputData()) {
+          if (node.getName().isPresent() && node.getName().get().equals(inputColumnName)) {
+            matchingNodes.add(node);
+          }
+        } else if (node.isDecision()) {
+          VDmnDecision decision = (VDmnDecision) node;
+          // check for each output column, if the name of the output column matches the input column
+          // name
+          for (VDmnOutputColumn outputColumn : decision.getDmnDecisionTable().getOutputColumns()) {
+            if (outputColumn.getName().isPresent()
+                && outputColumn.getName().get().equals(inputColumnName)) {
+              matchingNodes.add(node);
+            }
+          }
+        }
+      }
+    }
+    // if founded list of input nodes > 1 --> Add to result
+    if (matchingNodes.size() > 1) {
+      matchingNodes.forEach(n -> vreFactory.addElement(VerificationResultEntryElement.create(n)));
+      vreFactory
+          .addElement(VerificationResultEntryElement.create(inputColumn))
+          .addVerificationFix(
+              VerificationFix.getBuilder()
+                  .withFixName(DEFAULT_SHOW_NAME)
+                  .addAction(ACTION_SHOW_INPUT_COLUMNS)
+                  .addAction(ACTION_SHOW_INPUT_DATA)
+                  .addAction(ACTION_SHOW_DECISION)
+                  .build())
+          .addToEntry(
+              VerificationClassification.WARNING,
+              templateDecision(inputColumn.getDmnDecision())
+                  + "Input column \"%s\" has multiple input data node.",
+              getColumnStringName(inputColumn));
+    }
+  }
+}

dmnverifierapi/src/main/java/de/unikoblenz/fgbks/core/dmn/verification/verifier/types/MultipleInputDataVerification.java

+package de.unikoblenz.fgbks.core.dmn.verification.verifier.types;
+
+import de.unikoblenz.fgbks.base.domain.Description;
+import de.unikoblenz.fgbks.base.domain.Name;
+import de.unikoblenz.fgbks.core.dmn.verification.verifier.classification.ClassificationType;
+import de.unikoblenz.fgbks.core.dmn.verification.verifier.classification.DrdModelingLevelVerification;
+import javax.validation.constraints.NotNull;
+
+@Type
+public class MultipleInputDataVerification extends AbstractVerificationType {
+
+  private static final MultipleInputDataVerification instance = new MultipleInputDataVerification();
+
+  private MultipleInputDataVerification() {
+    super(
+        new Name("MultipleInputDataVerification"),
+        new Name("Multiple Input Data"),
+        new Description(
+            "Detecting columns which has more than one input data (or output columns from decisions)."));
+  }
+
+  public static MultipleInputDataVerification getInstance() {
+    return instance;
+  }
+
+  @Override
+  public @NotNull ClassificationType getClassification() {
+    return DrdModelingLevelVerification.getInstance();
+  }
+}

dmnverifierapi/verifier.md

@@ -52,6 +52,18 @@ Detecting for all decisions and input data nodes if their output names are found
 TODO
 ```
 
+### Multiple Input Data Verification
+- Type: [MultipleInputDataVerification](src/main/java/de/unikoblenz/fgbks/core/dmn/verification/verifier/types/MultipleInputDataVerification.java)
+- Verifier: [MultipleInputDataVerifier](src/main/java/de/unikoblenz/fgbks/core/dmn/verification/verifier/impl/MultipleInputDataVerifier.java)
+
+#### Description
+Detecting columns which has more than one input data (or output columns from decisions).
+
+#### Algorithm
+```
+TODO
+```
+
 ## Modeling Level Verification
 - Classification: [ModelingLevelVerification](src/main/java/de/unikoblenz/fgbks/core/dmn/verification/verifier/classification/ModelingLevelVerification.java)