org.springframework.expression.spel.ast
Class Selection

java.lang.Object
  org.antlr.runtime.tree.BaseTree
      org.antlr.runtime.tree.CommonTree
          org.springframework.expression.spel.ast.SpelNode
              org.springframework.expression.spel.ast.Selection

All Implemented Interfaces:

java.io.Serializable, org.antlr.runtime.tree.Tree

public class Selection
extends SpelNode

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.

Author:

Andy Clement

See Also:

Serialized Form

Field Summary

static int	ALL
static int	FIRST
static int	LAST

Fields inherited from class org.antlr.runtime.tree.CommonTree

startIndex, stopIndex, token

Fields inherited from class org.antlr.runtime.tree.BaseTree

children

Fields inherited from interface org.antlr.runtime.tree.Tree

INVALID_NODE

Constructor Summary

Selection(org.antlr.runtime.Token payload, int variant)

Method Summary

java.lang.Object	getValue(ExpressionState state) Evaluate the expression node in the context of the supplied expression state and return the value.
boolean	isWritable(ExpressionState expressionState) Determine if this expression node will support a setValue() call.
java.lang.String	toStringAST()

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

getChild, getObjectClass, getTokenName, getValue, setValue

Methods inherited from class org.antlr.runtime.tree.CommonTree

dupNode, getCharPositionInLine, getLine, getText, getToken, getTokenStartIndex, getTokenStopIndex, getType, isNil, setTokenStartIndex, setTokenStopIndex, toString

Methods inherited from class org.antlr.runtime.tree.BaseTree

addChild, addChildren, createChildrenList, deleteChild, dupTree, getChildCount, getFirstChildWithType, setChild, toStringTree

Methods inherited from class java.lang.Object

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

Constructor Detail

Selection

public Selection(org.antlr.runtime.Token payload,
                 int variant)

Method Detail

getValue

public java.lang.Object getValue(ExpressionState state)
                          throws EvaluationException

Description copied from class: SpelNode

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

Specified by:

getValue in class SpelNode

Parameters:

state - the current expression state (includes the context)

Returns:

the value of this node evaluated against the specified state

Throws:

EvaluationException

toStringAST

public java.lang.String toStringAST()

Specified by:

toStringAST in class SpelNode

Returns:

the string form of this AST node

isWritable

public boolean isWritable(ExpressionState expressionState)
                   throws SpelException

Description copied from class: SpelNode

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

Overrides:

isWritable in class SpelNode

Parameters:

expressionState - the current expression state (includes the context)

Returns:

true if the expression node will allow setValue()

Throws:

SpelException