org.springframework.expression.spel.ast

Class Selection

java.lang.Object

org.springframework.expression.spel.ast.SpelNodeImpl

org.springframework.expression.spel.ast.Selection

All Implemented Interfaces:

SpelNode

public class Selection
extends SpelNodeImpl

Represents selection over a map or collection. For example: {1,2,3,4,5,6,7,8,9,10}.?{#isEven(#this) == 'y'} returns [2, 4, 6, 8, 10]

Basically a subset of the input data is returned based on the evaluation of the expression supplied as selection criteria.

Since:

3.0

Author:

Andy Clement, Mark Fisher, Sam Brannen

Field Summary

Fields

Modifier and Type	Field and Description
static int	ALL
static int	FIRST
static int	LAST
private boolean	nullSafe
private int	variant

Fields inherited from class org.springframework.expression.spel.ast.SpelNodeImpl

children, pos

Constructor Summary

Constructors

Constructor and Description
Selection(boolean nullSafe, int variant, int pos, SpelNodeImpl expression)

Method Summary

Methods

Modifier and Type	Method and Description
TypedValue	getValueInternal(ExpressionState state)
protected ValueRef	getValueRef(ExpressionState state)
java.lang.String	toStringAST()

Methods inherited from class org.springframework.expression.spel.ast.SpelNodeImpl

getChild, getChildCount, getEndPosition, getObjectClass, getPreviousChild, getStartPosition, getTypedValue, getValue, getValue, isWritable, nextChildIs, setValue

Methods inherited from class java.lang.Object

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

Field Detail

ALL

public static final int ALL

See Also:

Constant Field Values

FIRST

public static final int FIRST

See Also:

Constant Field Values

LAST

public static final int LAST

See Also:

Constant Field Values

variant

private final int variant

nullSafe

private final boolean nullSafe

Constructor Detail

Selection

public Selection(boolean nullSafe,
         int variant,
         int pos,
         SpelNodeImpl expression)

Method Detail

getValueInternal

public TypedValue getValueInternal(ExpressionState state)
                            throws EvaluationException

Specified by:

getValueInternal in class SpelNodeImpl

Throws:

EvaluationException

getValueRef

protected ValueRef getValueRef(ExpressionState state)
                        throws EvaluationException

Overrides:

getValueRef in class SpelNodeImpl

Throws:

EvaluationException

toStringAST

public java.lang.String toStringAST()

Specified by:

toStringAST in interface SpelNode

Specified by:

toStringAST in class SpelNodeImpl

Returns:

the string form of this AST node