VariableNode (QDL root module 1.5.6 API)

java.lang.Object
- edu.uiuc.ncsa.qdl.expressions.ExpressionImpl
- - edu.uiuc.ncsa.qdl.expressions.VariableNode

All Implemented Interfaces:

ExpressionNode, ExpressionInterface, HasResultInterface, Statement, Serializable
```
public class VariableNode
extends ExpressionImpl
```
Created by Jeff Gaynor
on 1/13/20 at 4:28 PM

See Also:

Serialized Form

Field Summary
- Fields inherited from class edu.uiuc.ncsa.qdl.expressions.ExpressionImpl
  arguments, result, valence
- Fields inherited from interface edu.uiuc.ncsa.qdl.statements.ExpressionInterface
  ALL_INDICES_NODE, ALT_IF_NODE, ASSIGNMENT_NODE, CLOSED_SLICE_NODE, COMPARISON_DYAD_NODE, CONSTANT_NODE, DYAD_NODE, DYADIC_FUNCTION_REFERENCE_NODE, EXPRESSION_STEM_NODE, EXPRESSION_STEM2_NODE, FUNCTION_REFERENCE_NODE, LAMBDA_DEFINITION_NODE, LIST_NODE, MODULE_NODE, MONAD_NODE, NILAD_NODE, OPEN_SLICE_NODE, PARENTHESIZED_NODE, PARSE_EXPRESSION_BLOCK_NODE, PARSE_STATEMENT_BLOCK_NODE, POLYAD_NODE, QDL_NULL_NODE, SELECT_NODE, SET_NODE, STEM_ENTRY_NODE, STEM_EXTRACTION_NODE, STEM_NODE, UNKNOWN_NODE, VARIABLE_NODE

Constructor Summary

Constructors
Constructor Description

VariableNode()

VariableNode(TokenPosition tokenPosition)

VariableNode(String variableReference)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Object`	`evaluate(State state)`
`int`	`getNodeType()`	QDL is not strongly typed but Java is, so each node type should have a unique integer and conditionals should use that, not the instanceof operator.
`String`	`getVariableReference()`
`boolean`	`isStem()`
`ExpressionNode`	`makeCopy()`
`void`	`setVariableReference(String variableReference)`
`String`	`toString()`

Methods inherited from class edu.uiuc.ncsa.qdl.expressions.ExpressionImpl
evalArg, evalLastArg, evaluatedArgs, getAlias, getArgAt, getArgCount, getArguments, getEvaluatedArgs, getLastArg, getOperatorType, getResult, getResultType, getSourceCode, getTokenPosition, hasAlias, hasEvaluatedArgs, hasTokenPosition, isEvaluated, isSizeQuery, setAlias, setArguments, setEvaluated, setEvaluatedArgs, setOperatorType, setResult, setResultType, setSizeQuery, setSourceCode, setTokenPosition

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - VariableNode
```
public VariableNode()
```
  - VariableNode
```
public VariableNode(TokenPosition tokenPosition)
```
  - VariableNode
```
public VariableNode(String variableReference)
```
- Method Detail
  - getVariableReference
```
public String getVariableReference()
```
  - setVariableReference
```
public void setVariableReference(String variableReference)
```
  - isStem
```
public boolean isStem()
```
  - evaluate
```
public Object evaluate(State state)
```
  - makeCopy
```
public ExpressionNode makeCopy()
```
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class ExpressionImpl
  - getNodeType
```
public int getNodeType()
```
    Description copied from interface: ExpressionInterface
    
    QDL is not strongly typed but Java is, so each node type should have a unique integer and conditionals should use that, not the instanceof operator. This allows for efficient programming with switch statements rather than a bevy of conditionals (potentially each of which gets done even if the correct case has been handled).
    
    Returns: