Also: SpringExpressions

public abstract class

SpelNodeImpl

extends Object
implements SpelNode

java.lang.Object
↳	org.springframework.expression.spel.ast.SpelNodeImpl

Known Direct Subclasses

Assign, BeanReference, CompoundExpression, ConstructorReference, Elvis, FunctionReference, Identifier, Indexer, InlineList, Literal, MethodReference, Operator, OperatorNot, Projection, PropertyOrFieldReference, QualifiedIdentifier, Selection, Ternary, TypeReference, VariableReference

Assign	Represents assignment.
BeanReference	Represents a bean reference to a type, for example "@foo" or "@'foo.bar'"
CompoundExpression	Represents a DOT separated expression sequence, such as 'property1.property2.methodOne()'
ConstructorReference	Represents the invocation of a constructor.
Elvis	Represents the elvis operator ?:.
FunctionReference	A function reference is of the form "#someFunction(a,b,c)".
Identifier
Indexer	An Indexer can index into some proceeding structure to access a particular piece of it.
InlineList	Represent a list in an expression, e.g.
Literal	Common superclass for nodes representing literals (boolean, string, number, etc).
MethodReference
Operator	Common supertype for operators that operate on either one or two operands.
OperatorNot	Represents a NOT operation.
Projection	Represents projection, where a given operation is performed on all elements in some input sequence, returning a new sequence of the same size.
PropertyOrFieldReference	Represents a simple property or field reference.
QualifiedIdentifier	Represents a dot separated sequence of strings that indicate a package qualified type reference.
Selection	Represents selection over a map or collection.
Ternary	Represents a ternary expression, for example: "someCheck()?true:false".
TypeReference	Represents a reference to a type, for example "T(String)" or "T(com.somewhere.Foo)"
VariableReference	Represents a variable reference, eg.

Known Indirect Subclasses

BooleanLiteral, IntLiteral, LongLiteral, NullLiteral, OpAnd, OpDivide, OpEQ, OpGE, OpGT, OpLE, OpLT, OpMinus, OpModulus, OpMultiply, OpNE, and 8 others.

BooleanLiteral	Represents the literal values TRUE and FALSE.
IntLiteral	Expression language AST node that represents an integer literal.
LongLiteral	Expression language AST node that represents a long integer literal.
NullLiteral
OpAnd	Represents the boolean AND operation.
OpDivide	Implements division operator.
OpEQ	Implements equality operator.
OpGE	Implements greater-than-or-equal operator.
OpGT	Implements greater-than operator.
OpLE	Implements the less-than-or-equal operator.
OpLT	Implements the less-than operator.
OpMinus	The minus operator supports: subtraction of doubles (floats are represented as doubles) subtraction of longs subtraction of integers subtraction of an int from a string of one character (effectively decreasing that character), so 'd'-3='a' It can be used as a unary operator for numbers (double/long/int).
OpModulus	Implements the modulus operator.
OpMultiply	Implements the multiply operator.
OpNE	Implements the not-equal operator.
OpOr	Represents the boolean OR operation.
OpPlus	The plus operator will: add doubles (floats are represented as doubles) add longs add integers concatenate strings It can be used as a unary operator for numbers (double/long/int).
OperatorBetween	Represents the between operator.
OperatorInstanceof	The operator 'instanceof' checks if an object is of the class specified in the right hand operand, in the same way that `instanceof` does in Java.
OperatorMatches	Implements the matches operator.
OperatorPower	The power operator.
RealLiteral
StringLiteral

Class Overview

The common supertype of all AST nodes in a parsed Spring Expression Language format expression.

Summary

Fields
protected SpelNodeImpl[]	children
protected int	pos

Public Constructors
	SpelNodeImpl(int pos, SpelNodeImpl... operands)

Public Methods
SpelNode	getChild(int index) Helper method that returns a SpelNode rather than an Antlr Tree node.
int	getChildCount()
int	getEndPosition()
Class<?>	getObjectClass(Object obj) Determine the class of the object passed in, unless it is already a class object.
int	getStartPosition()
final TypedValue	getTypedValue(ExpressionState expressionState) Evaluate the expression node in the context of the supplied expression state and return the typed value.
final Object	getValue(ExpressionState expressionState) Evaluate the expression node in the context of the supplied expression state and return the value.
abstract TypedValue	getValueInternal(ExpressionState expressionState)
boolean	isWritable(ExpressionState expressionState) Determine if this expression node will support a setValue() call.
void	setValue(ExpressionState expressionState, Object newValue) Evaluate the expression to a node and then set the new value on that node.
abstract String	toStringAST()

Protected Methods
SpelNodeImpl	getPreviousChild()
final <T> T	getValue(ExpressionState state, Class<T> desiredReturnType)
boolean	nextChildIs(Class... clazzes)

[Expand]

Inherited Methods

From class java.lang.Object

From interface org.springframework.expression.spel.SpelNode

abstract SpelNode	getChild(int index) Helper method that returns a SpelNode rather than an Antlr Tree node.
abstract int	getChildCount()
abstract int	getEndPosition()
abstract Class<?>	getObjectClass(Object obj) Determine the class of the object passed in, unless it is already a class object.
abstract int	getStartPosition()
abstract TypedValue	getTypedValue(ExpressionState expressionState) Evaluate the expression node in the context of the supplied expression state and return the typed value.
abstract Object	getValue(ExpressionState expressionState) Evaluate the expression node in the context of the supplied expression state and return the value.
abstract boolean	isWritable(ExpressionState expressionState) Determine if this expression node will support a setValue() call.
abstract void	setValue(ExpressionState expressionState, Object newValue) Evaluate the expression to a node and then set the new value on that node.
abstract String	toStringAST()

Fields

protected SpelNodeImpl[] children

Also: SpringExpressions

protected int pos

Also: SpringExpressions

Public Constructors

public SpelNodeImpl (int pos, SpelNodeImpl... operands)

Also: SpringExpressions

Public Methods

public SpelNode getChild (int index)

Also: SpringExpressions

Helper method that returns a SpelNode rather than an Antlr Tree node.

Returns

the child node cast to a SpelNode

public int getChildCount ()

Also: SpringExpressions

public int getEndPosition ()

Also: SpringExpressions

public Class<?> getObjectClass (Object obj)

Also: SpringExpressions

Determine the class of the object passed in, unless it is already a class object.

Returns

the class of the object if it is not already a class object, or null if the object is null

public int getStartPosition ()

Also: SpringExpressions

public final TypedValue getTypedValue (ExpressionState expressionState)

Also: SpringExpressions

Evaluate the expression node in the context of the supplied expression state and return the typed value.

Parameters

expressionState	the current expression state (includes the context)

Returns

the type value of this node evaluated against the specified state

Throws

EvaluationException

public final Object getValue (ExpressionState expressionState)

Also: SpringExpressions

Evaluate the expression node in the context of the supplied expression state and return the value.

Parameters

expressionState	the current expression state (includes the context)

Returns

the value of this node evaluated against the specified state

Throws

EvaluationException

public abstract TypedValue getValueInternal (ExpressionState expressionState)

Also: SpringExpressions

Throws

EvaluationException

public boolean isWritable (ExpressionState expressionState)

Also: SpringExpressions

Determine if this expression node will support a setValue() call.

Parameters

expressionState	the current expression state (includes the context)

Returns

true if the expression node will allow setValue()

Throws

EvaluationException

public void setValue (ExpressionState expressionState, Object newValue)

Also: SpringExpressions

Evaluate the expression to a node and then set the new value on that node. For example, if the expression evaluates to a property reference then the property will be set to the new value.

Parameters

expressionState	the current expression state (includes the context)
newValue	the new value

Throws

EvaluationException

public abstract String toStringAST ()

Also: SpringExpressions

Protected Methods

protected SpelNodeImpl getPreviousChild ()

Also: SpringExpressions

protected final T getValue (ExpressionState state, Class<T> desiredReturnType)

Also: SpringExpressions

Throws

EvaluationException

protected boolean nextChildIs (Class... clazzes)

Also: SpringExpressions

Returns

true if the next child is one of the specified classes

Classes

Enums

SpelNodeImpl

Class Overview

Summary

Fields

protected SpelNodeImpl[] children

protected int pos

Public Constructors

public SpelNodeImpl (int pos, SpelNodeImpl... operands)

Public Methods

public SpelNode getChild (int index)

Returns

public int getChildCount ()

public int getEndPosition ()

public Class<?> getObjectClass (Object obj)

Returns

public int getStartPosition ()

public final TypedValue getTypedValue (ExpressionState expressionState)

Parameters

Returns

Throws

public final Object getValue (ExpressionState expressionState)

Parameters

Returns

Throws

public abstract TypedValue getValueInternal (ExpressionState expressionState)

Throws

public boolean isWritable (ExpressionState expressionState)

Parameters

Returns

Throws

public void setValue (ExpressionState expressionState, Object newValue)

Parameters

Throws

public abstract String toStringAST ()

Protected Methods

protected SpelNodeImpl getPreviousChild ()

protected final T getValue (ExpressionState state, Class<T> desiredReturnType)

Throws

protected boolean nextChildIs (Class... clazzes)

Returns