Package org.qdl_lang.expressions
Class ConstantNode
- java.lang.Object
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- org.qdl_lang.expressions.ExpressionImpl
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- org.qdl_lang.expressions.ConstantNode
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- 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
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Field Summary
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Fields inherited from class org.qdl_lang.expressions.ExpressionImpl
arguments, result, valence
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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
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Constructor Summary
Constructors Constructor Description ConstantNode(QDLValue result)
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Method Summary
All Methods Instance Methods Concrete Methods 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()
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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
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Constructor Detail
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ConstantNode
public ConstantNode(QDLValue result)
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Method Detail
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makeCopy
public ExpressionNode makeCopy()
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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:
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