package org.vertexium.cypher.functions.scalar;
import org.vertexium.Element;
import org.vertexium.cypher.VertexiumCypherQueryContext;
import org.vertexium.cypher.ast.model.CypherAstBase;
import org.vertexium.cypher.exceptions.VertexiumCypherNotImplemented;
import org.vertexium.cypher.exceptions.VertexiumCypherTypeErrorException;
import org.vertexium.cypher.executor.ExpressionScope;
import org.vertexium.cypher.functions.CypherFunction;
public class LastFunction extends CypherFunction {
@Override
public Object invoke(VertexiumCypherQueryContext ctx, CypherAstBase[] arguments, ExpressionScope scope) {
assertArgumentCount(arguments, 1);
Object arg0 = ctx.getExpressionExecutor().executeExpression(ctx, arguments[0], scope);
if (arg0 == null) {
return null;
}
if (arg0 instanceof Element) {
return arg0;
}
throw new VertexiumCypherTypeErrorException(arg0, Element.class, null);
}
}