Skeleton implementation of CognativeComplexityVisitor

pmd-apex/src/main/java/net/sourceforge/pmd/lang/apex/metrics/impl/CognitiveComplexityMetric.java

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+package net.sourceforge.pmd.lang.apex.metrics.impl;
+
+import net.sourceforge.pmd.lang.apex.ast.ASTMethod;
+import net.sourceforge.pmd.lang.apex.metrics.impl.visitors.CognitiveComplexityVisitor;
+import net.sourceforge.pmd.lang.metrics.MetricOptions;
+
+/**
+ * Measures the cognitive complexity of a Class / Method in Apex.
+ *
+ * See https://www.sonarsource.com/docs/CognitiveComplexity.pdf for information about the metric
+ *
+ * @author Gwilym Kuiper
+ */
+public class CognitiveComplexityMetric extends AbstractApexOperationMetric {
+    @Override
+    public double computeFor(ASTMethod node, MetricOptions options) {
+        CognitiveComplexityVisitor.State resultingState = (CognitiveComplexityVisitor.State) node.jjtAccept(new CognitiveComplexityVisitor(), new CognitiveComplexityVisitor.State());
+        return resultingState.getComplexity();
+    }
+}

pmd-apex/src/main/java/net/sourceforge/pmd/lang/apex/metrics/impl/visitors/CognitiveComplexityVisitor.java

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+package net.sourceforge.pmd.lang.apex.metrics.impl.visitors;
+
+import net.sourceforge.pmd.lang.apex.ast.*;
+
+/**
+ * @author Gwilym Kuiper
+ */
+public class CognitiveComplexityVisitor extends ApexParserVisitorAdapter {
+    public static class State {
+        public double getComplexity() {
+            return 0.0;
+        }
+    }
+}