SONARJAVA-6078 ScopedValue where result is ignored

java-checks-test-sources/default/src/main/files/non-compiling/checks/UnusedScopedValueWhereResultEdgeCasesSample.java

@@ -0,0 +1,136 @@
+import static java.lang.ScopedValue.where;
+
+
+static final ScopedValue<String> SCOPED = ScopedValue.newInstance();
+static final ScopedValue<String> SCOPED2 = ScopedValue.newInstance();
+
+// Field storage - shouldn't be flagged as we can't track field usage reliably
+ScopedValue.Carrier carrierField;
+static ScopedValue.Carrier staticCarrierField;
+
+// ===== CONTROL FLOW =====
+
+void conditionalUsage(boolean condition) {
+  var carrier = ScopedValue.where(SCOPED, "Conditional usage"); // Compliant - used conditionally
+  if (condition) {
+    carrier.run(() -> {
+    });
+  }
+}
+
+// ===== VARIABLE SCENARIOS =====
+
+void variableReassignedBeforeUse() {
+  var carrier = ScopedValue.where(SCOPED, "Initial instance"); // Noncompliant
+  carrier = ScopedValue.where(SCOPED, "Second instance"); // Compliant - this instance is used
+  carrier.run(() -> {
+  });
+}
+
+void multipleVariablesSameCarrierUsed() {
+  var carrier1 = ScopedValue.where(SCOPED, "Single instance"); // Compliant
+  var carrier2 = carrier1; // Carrier2 points to same object
+  carrier2.run(() -> {
+  });
+}
+
+void multipleVariablesSameCarrierUsed2() {
+  var carrier1 = ScopedValue.where(SCOPED, "Single instance"); // Compliant
+  var carrier2 = carrier1; // Carrier2 points to same object
+  carrier1.run(() -> {
+  });
+}
+
+void multipleVariablesSameCarrierUnused() {
+  var carrier1 = ScopedValue.where(SCOPED, "Single instance unused"); // Noncompliant
+  var carrier2 = carrier1; // Carrier2 points to same object but is never used
+}
+
+void carrierStoredInField() {
+  carrierField = ScopedValue.where(SCOPED, "Stored in instance field"); // Compliant - way of escaping
+}
+
+void carrierStoredInStaticField() {
+  staticCarrierField = ScopedValue.where(SCOPED, "Stored in static field"); // Compliant - way of escaping
+}
+
+void escapingInFieldTwice() {
+  carrierField = ScopedValue.where(SCOPED, "Instance 1"); // Compliant - escapes, we can't track field usage
+  carrierField = ScopedValue.where(SCOPED, "Instance 2"); // Compliant - reassigned but still escapes
+}
+
+// ===== RETURN VARIATIONS =====
+
+ScopedValue.Carrier ternaryReturn(boolean condition) {
+  var carrier1 = ScopedValue.where(SCOPED, "Ternary return - true"); // Compliant - potentially returned
+  var carrier2 = ScopedValue.where(SCOPED, "Ternary return - false"); // Compliant - potentially returned
+  return condition ? carrier1 : carrier2;
+}
+
+// ===== NON-CONSUMING METHOD CALLS =====
+
+void standardFunctinsOnCarrier() {
+  var carrier = ScopedValue.where(SCOPED, "Standard functions"); // Noncompliant
+  carrier.toString();
+  carrier.hashCode();
+  carrier.equals(null);
+}
+
+void getOnCarrier() {
+  var carrier = ScopedValue.where(SCOPED, "Get function"); // Noncompliant
+  carrier.get(SCOPED);
+}
+
+// ===== LAMBDA/CLOSURE =====
+
+void carrierUsedInsideLambda() {
+  var carrier = ScopedValue.where(SCOPED, "hello"); // Compliant - used inside lambda
+  Runnable r = () -> {
+    carrier.run(() -> {
+    });
+  };
+  r.run();
+}
+
+// ===== STATIC IMPORT =====
+
+void staticImportWhere() {
+  where(SCOPED, "Static import unused"); // Noncompliant
+}
+
+void staticImportWhereUsed() {
+  where(SCOPED, "Static import used").run(() -> {
+  }); // Compliant - used immediately
+}
+
+void staticImportWhereVariable() {
+  var carrier = where(SCOPED, "Static import unused variable"); // Noncompliant
+}
+
+void staticImportWhereVariableUsed() {
+  var carrier = where(SCOPED, "Static import used variable "); // Compliant - used
+  carrier.run(() -> {
+  });
+}
+
+// ===== CONSTRUCTOR ARGUMENT =====
+
+void carrierAsConstructorArgument() {
+  var carrier = ScopedValue.where(SCOPED, "Carrier in constructor argument"); // Compliant - escapes via constructor
+  new CarrierHolder(carrier);
+}
+
+// ===== HELPER METHODS AND CLASSES =====
+
+
+static class CarrierHolder {
+  CarrierHolder(ScopedValue.Carrier carrier) // Noncompliant
+  {
+  }
+
+  CarrierHolder(ScopedValue.Carrier carrier, int i) // Compliant
+  {
+    carrier.run(() -> {
+    });
+  }
+}

java-checks-test-sources/default/src/main/files/non-compiling/checks/UnusedScopedValueWhereResultSample.java

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+static final ScopedValue myScopedValue = ScopedValue.newInstance();
+static final ScopedValue myScopedValue2 = ScopedValue.newInstance();
+
+void main() {
+  ScopedValue.where(myScopedValue, "Simple chained with get").get(myScopedValue); // Noncompliant
+  ScopedValue.where(myScopedValue, "Simple chained with run").run(() -> {
+  }); // Compliant, the result is used immediately
+  ScopedValue.where(myScopedValue, "Chained two").where(myScopedValue2, "times with run").run(() -> {
+  }); // Compliant, the result is used immediately
+  ScopedValue.where(myScopedValue, "Simple carrier creation"); // Noncompliant
+  var myUnusedCarrier = ScopedValue.where(myScopedValue, "Unused carrier in variable"); // Noncompliant
+  var myUnused2LevelCarrier = ScopedValue.where(myScopedValue, "Unused carrrier in variable").where(myScopedValue2, "2 levels of where"); // Noncompliant
+  var myUsedCarrier = ScopedValue.where(myScopedValue, "Used carrier in variable"); // Compliant, the result is assigned to a variable and used
+  var myUsed2LevelCarrier = ScopedValue.where(myScopedValue, "Used carrier in variable").where(myScopedValue2, "2 levels of where"); // Compliant, the result is assigned to a variable and used
+  myUsedCarrier.run(() -> {
+  });
+  myUsed2LevelCarrier.run(() -> {
+  });
+}
+
+void escapedCarrierFunctionCall() {
+  var carrier = ScopedValue.where(myScopedValue, "Escape a carrier with a function call"); // compliant - the result escapes
+  usedCarrierArgument(carrier);
+}
+
+void escapedCarrierFunctionCall2() {
+  usedCarrierArgument(ScopedValue.where(myScopedValue, "Escape a carrier with a function call")); // compliant - the result escapes
+}
+
+void usedCarrierArgument(ScopedValue.Carrier carrier) { // compliant - the carrier is used in the function
+  carrier.run(() -> {
+  });
+}
+
+void unusedCarrierArgument(ScopedValue.Carrier carrier) { // Noncompliant
+}
+
+ScopedValue.Carrier escapedCarrierReturn() {
+  var carrier = ScopedValue.where(myScopedValue, "Escape a carrier with a return"); // compliant - the result escapes
+  return carrier;
+}
+
+ScopedValue.Carrier escapedCarrierReturn2() {
+  return ScopedValue.where(myScopedValue, "Escape a carrier with a return"); // compliant - the result escapes
+}
+
+void escapedCarrierArgument(ScopedValue.Carrier carrier) { // compliant - the carrier is used in the function
+  usedCarrierArgument(carrier);
+}