Package org.qdl_lang.expressions

Class ConstantNode

java.lang.Object

org.qdl_lang.expressions.ExpressionImpl

org.qdl_lang.expressions.ConstantNode

All Implemented Interfaces:

Serializable, ExpressionNode, ExpressionInterface, HasResultInterface, Statement

Direct Known Subclasses:

AllIndices, QDLNull

public class ConstantNode
extends ExpressionImpl

Created by Jeff Gaynor
on 1/13/20 at 4:08 PM

See Also:

Serialized Form

Field Summary

Fields inherited from class org.qdl_lang.expressions.ExpressionImpl

arguments, result, valence

Fields inherited from interface org.qdl_lang.statements.ExpressionInterface

ALL_INDICES_NODE, ALT_IF_NODE, ASSIGNMENT_NODE, AXIS_RESTRICTION_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
ConstantNode(QDLValue result)

Method Summary

Modifier and Type	Method	Description
QDLValue	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.
ExpressionNode	makeCopy()

Methods inherited from class org.qdl_lang.expressions.ExpressionImpl

addArgument, 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, setResult, setSizeQuery, setSourceCode, setTokenPosition, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

ConstantNode

public ConstantNode(QDLValue result)

Method Detail

evaluate

public QDLValue evaluate(State state)

makeCopy

public ExpressionNode makeCopy()

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: