DateLiteralInterpreter.java example

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package com.sap.finex.interpreter.expressions;

import structure.Association;
import structure.Field;
import structure.FinexClass;
import structure.Type;
import behavior.actions.Statement;
import behavior.expressions.Expression;
import behavior.expressions.literals.DateLiteral;
import behavior.functions.NativeImpl;
import behavior.functions.SignatureImplementation;

import com.sap.finex.interpreter.FinexInterpreter;
import com.sap.finex.interpreter.FinexStackFrame;
import com.sap.finex.interpreter.objects.FinexNativeObject;
import com.sap.runlet.abstractinterpreter.Interpreter;
import com.sap.runlet.abstractinterpreter.util.DateParser;
import com.sap.runlet.abstractinterpreter.util.InvalidDateException;

public class DateLiteralInterpreter implements Interpreter<DateLiteral, FinexClass, Type, FinexClass,
Association, Field, Statement, Expression, SignatureImplementation, FinexStackFrame, NativeImpl, FinexInterpreter> {
    private DateLiteral literal;
    
    public DateLiteralInterpreter(DateLiteral literal) {
	this.literal = literal;
    }

    @Override
    public FinexNativeObject evaluate(FinexInterpreter interpreter) {
	// a native object is used to encode the number value
	try {
	    return new FinexNativeObject((FinexClass) literal.getType(), DateParser.parse(literal.getLiteral()),
		    interpreter.getDefaultSnapshot(), interpreter);
	} catch (InvalidDateException e) {
	    throw new RuntimeException("Date "+literal.getLiteral()+" could not be parsed although lexer considered it an ISO date", e);
	}
    }
    
}