From 75221baa8a640b84c9537dd81047f0e17f33edc1 Mon Sep 17 00:00:00 2001
From: Antonio <a.f.lupu@student.tudelft.nl>
Date: Fri, 24 May 2024 12:07:37 +0200
Subject: [PATCH] Implemented interp method for 'is absent' operation + Tests

---
 .../RosettaInterpreterVisitor.java            |  3 +-
 ...aInterpreterListOperationsInterpreter.java | 24 ++++++++++++++
 ...erpreterListOperationsInterpreterTest.java | 33 +++++++++++++++++++
 3 files changed, 58 insertions(+), 2 deletions(-)

diff --git a/rosetta-lang/src/main/java/com/regnosys/rosetta/interpreternew/RosettaInterpreterVisitor.java b/rosetta-lang/src/main/java/com/regnosys/rosetta/interpreternew/RosettaInterpreterVisitor.java
index ef5d87a2e..78347cccb 100644
--- a/rosetta-lang/src/main/java/com/regnosys/rosetta/interpreternew/RosettaInterpreterVisitor.java
+++ b/rosetta-lang/src/main/java/com/regnosys/rosetta/interpreternew/RosettaInterpreterVisitor.java
@@ -106,8 +106,7 @@ public RosettaInterpreterValue interp(RosettaExistsExpression exp) {
 
 	@Override
 	public RosettaInterpreterValue interp(RosettaAbsentExpression exp) {
-		// TODO Auto-generated method stub
-		throw new UnsupportedOperationException();
+		return new RosettaInterpreterListOperationsInterpreter().interp(exp);
 	}
 
 	@Override
diff --git a/rosetta-lang/src/main/java/com/regnosys/rosetta/interpreternew/visitors/RosettaInterpreterListOperationsInterpreter.java b/rosetta-lang/src/main/java/com/regnosys/rosetta/interpreternew/visitors/RosettaInterpreterListOperationsInterpreter.java
index da2d991ba..74e964816 100644
--- a/rosetta-lang/src/main/java/com/regnosys/rosetta/interpreternew/visitors/RosettaInterpreterListOperationsInterpreter.java
+++ b/rosetta-lang/src/main/java/com/regnosys/rosetta/interpreternew/visitors/RosettaInterpreterListOperationsInterpreter.java
@@ -10,6 +10,7 @@
 import com.regnosys.rosetta.interpreternew.values.RosettaInterpreterErrorValue;
 import com.regnosys.rosetta.interpreternew.values.RosettaInterpreterStringValue;
 import com.regnosys.rosetta.rosetta.expression.JoinOperation;
+import com.regnosys.rosetta.rosetta.expression.RosettaAbsentExpression;
 import com.regnosys.rosetta.rosetta.expression.RosettaContainsExpression;
 import com.regnosys.rosetta.rosetta.expression.RosettaDisjointExpression;
 import com.regnosys.rosetta.rosetta.expression.RosettaExistsExpression;
@@ -169,5 +170,28 @@ public RosettaInterpreterValue interp(RosettaExistsExpression exp) {
 		
 		return new RosettaInterpreterBooleanValue(exists);
 	}
+
+	
+	/**
+	 * Interprets an "is absent" expression.
+	 * If the argument of the expression is of size 0, so:
+	 * 	- either it is optional, (0..*), and it was not instantiated
+	 *  - or it is a list with 0 elements []
+	 *
+	 * @param exp "Is absent" expression to intepret
+	 * @return Boolean indicating if the interpreted argument is absent
+	 */
+	public RosettaInterpreterValue interp(RosettaAbsentExpression exp) {
+		RosettaExpression argument = exp.getArgument();
+		RosettaInterpreterValue interpretedArgument = argument.accept(visitor);
+		
+		if (RosettaInterpreterErrorValue.errorsExist(interpretedArgument)) {
+			return interpretedArgument;
+		}
+		
+		long count = RosettaInterpreterBaseValue.valueStream(interpretedArgument).count();
+		boolean isAbsent = count == 0;
+		return new RosettaInterpreterBooleanValue(isAbsent);
+	}
 		
 }
diff --git a/rosetta-testing/src/test/java/com/regnosys/rosetta/interpreternew/visitors/RosettaInterpreterListOperationsInterpreterTest.java b/rosetta-testing/src/test/java/com/regnosys/rosetta/interpreternew/visitors/RosettaInterpreterListOperationsInterpreterTest.java
index de13fe65e..3cef03d6e 100644
--- a/rosetta-testing/src/test/java/com/regnosys/rosetta/interpreternew/visitors/RosettaInterpreterListOperationsInterpreterTest.java
+++ b/rosetta-testing/src/test/java/com/regnosys/rosetta/interpreternew/visitors/RosettaInterpreterListOperationsInterpreterTest.java
@@ -274,4 +274,37 @@ void testExistsError() {
 		RosettaInterpreterErrorValue castedVal = (RosettaInterpreterErrorValue)val;
 		assertEquals(expected, castedVal);
 	}
+	
+	@Test
+	void testIsAbsentTrue() {
+		RosettaInterpreterBooleanValue expected = new RosettaInterpreterBooleanValue(true);
+		RosettaExpression expr = parser.parseExpression("[] is absent");
+		RosettaInterpreterValue val = interpreter.interp(expr);
+		assertTrue(val instanceof RosettaInterpreterBooleanValue);
+		RosettaInterpreterBooleanValue castedVal = (RosettaInterpreterBooleanValue)val;
+		assertEquals(expected, castedVal);
+	}
+	
+	@Test
+	void testIsAbsentFalse() {
+		RosettaInterpreterBooleanValue expected = new RosettaInterpreterBooleanValue(false);
+		RosettaExpression expr = parser.parseExpression("[True] is absent");
+		RosettaInterpreterValue val = interpreter.interp(expr);
+		assertTrue(val instanceof RosettaInterpreterBooleanValue);
+		RosettaInterpreterBooleanValue castedVal = (RosettaInterpreterBooleanValue)val;
+		assertEquals(expected, castedVal);
+	}
+	
+	@Test
+	void testIsAbsentError() {
+		RosettaInterpreterErrorValue expected = 
+				new RosettaInterpreterErrorValue(
+				new RosettaInterpreterError("Logical Operation: "
+						+ "Rightside is not of type Boolean"));
+		RosettaExpression expr = parser.parseExpression("(True and 1) is absent");
+		RosettaInterpreterValue val = interpreter.interp(expr);
+		assertTrue(val instanceof RosettaInterpreterErrorValue);
+		RosettaInterpreterErrorValue castedVal = (RosettaInterpreterErrorValue)val;
+		assertEquals(expected, castedVal);
+	}
 }