MADARA  3.4.1
Public Member Functions | Protected Attributes | List of all members
madara::expression::CompositeAndNode Class Reference

A composite node that performs a logical and. More...

#include <CompositeAndNode.h>

Inheritance diagram for madara::expression::CompositeAndNode:
madara::expression::CompositeTernaryNode madara::expression::ComponentNode

Public Member Functions

 CompositeAndNode (logger::Logger &logger, const ComponentNodes &nodes)
 Constructor. More...
 
virtual void accept (Visitor &visitor) const
 Accepts a visitor subclassed from the Visitor class. More...
 
virtual madara::knowledge::KnowledgeRecord evaluate (const madara::knowledge::KnowledgeUpdateSettings &settings)
 Evaluates the expression tree. More...
 
virtual madara::knowledge::KnowledgeRecord item (void) const
 Returns the printable character of the node. More...
 
virtual ComponentNode * left (void) const
 Returns the left expression. More...
 
virtual madara::knowledge::KnowledgeRecord prune (bool &can_change)
 Prunes the expression tree of unnecessary nodes. More...
 
virtual ComponentNode * right (void) const
 Returns the right expression. More...
 
void set_logger (logger::Logger &logger)
 Sets the logger for printing errors and debugging info. More...
 

Protected Attributes

logger::Logger * logger_
 handle the context More...
 
ComponentNodes nodes_
 

Detailed Description

A composite node that performs a logical and.

Definition at line 21 of file CompositeAndNode.h.

Constructor & Destructor Documentation

◆ CompositeAndNode()

madara::expression::CompositeAndNode::CompositeAndNode ( logger::Logger &  logger,
const ComponentNodes &  nodes 
)

Constructor.

Parameters
loggerthe logger to use for printing
nodes2+ nodes to be executed in sequence

Definition at line 17 of file CompositeAndNode.cpp.

Member Function Documentation

◆ accept()

void madara::expression::CompositeAndNode::accept ( Visitor &  visitor) const
virtual

Accepts a visitor subclassed from the Visitor class.

Parameters
visitorvisitor instance to use

Reimplemented from madara::expression::CompositeTernaryNode.

Definition at line 92 of file CompositeAndNode.cpp.

◆ evaluate()

madara::knowledge::KnowledgeRecord madara::expression::CompositeAndNode::evaluate ( const madara::knowledge::KnowledgeUpdateSettings &  settings)
virtual

Evaluates the expression tree.

Evaluates the node and its children.

Parameters
settingssettings for evaluating the node
Returns
zero unless both left and right expressions evaluate to non-zero. Right is not evaluated if left expression returns zero.

This does not prune any of the expression tree, and is much faster than the prune function

Implements madara::expression::CompositeTernaryNode.

Definition at line 76 of file CompositeAndNode.cpp.

◆ item()

madara::knowledge::KnowledgeRecord madara::expression::CompositeAndNode::item ( void  ) const
virtual

Returns the printable character of the node.

Returns
value of the node

Reimplemented from madara::expression::CompositeTernaryNode.

Definition at line 23 of file CompositeAndNode.cpp.

◆ left()

madara::expression::ComponentNode * madara::expression::ComponentNode::left ( void  ) const
virtualinherited

Returns the left expression.

Returns
a pointer to the left expression

Reimplemented in madara::expression::CompositeBinaryNode.

Definition at line 29 of file ComponentNode.cpp.

◆ prune()

madara::knowledge::KnowledgeRecord madara::expression::CompositeAndNode::prune ( bool &  can_change)
virtual

Prunes the expression tree of unnecessary nodes.

Prune the tree of unnecessary nodes.

Parameters
can_changeset to true if variable nodes are contained
Returns
zero unless both left and right expressions evaluate to non-zero. Right is not evaluated if left expression returns zero.

Returns evaluation of the node and sets can_change appropriately. if this node can be changed, that means it shouldn't be pruned.

Implements madara::expression::CompositeTernaryNode.

Definition at line 32 of file CompositeAndNode.cpp.

◆ right()

madara::expression::ComponentNode * madara::expression::ComponentNode::right ( void  ) const
virtualinherited

Returns the right expression.

Returns
a pointer to the right expression

Reimplemented in madara::expression::CompositeUnaryNode.

Definition at line 36 of file ComponentNode.cpp.

◆ set_logger()

void madara::expression::ComponentNode::set_logger ( logger::Logger &  logger)
inherited

Sets the logger for printing errors and debugging info.

Parameters
loggerthe logger to use

Definition at line 48 of file ComponentNode.cpp.

Member Data Documentation

◆ logger_

logger::Logger* madara::expression::ComponentNode::logger_
protectedinherited

handle the context

Definition at line 96 of file ComponentNode.h.

◆ nodes_

ComponentNodes madara::expression::CompositeTernaryNode::nodes_
protectedinherited

Definition at line 74 of file CompositeTernaryNode.h.

The documentation for this class was generated from the following files: