org.apache.commons.jexl2

Class UnifiedJEXL.JexlBasedExpression

java.lang.Object

org.apache.commons.jexl2.UnifiedJEXL.Expression

org.apache.commons.jexl2.UnifiedJEXL.JexlBasedExpression

Direct Known Subclasses:

UnifiedJEXL.DeferredExpression, UnifiedJEXL.ImmediateExpression, UnifiedJEXL.NestedExpression

Enclosing class:

UnifiedJEXL

private abstract class UnifiedJEXL.JexlBasedExpression
extends UnifiedJEXL.Expression

The base for Jexl based expressions.

Field Summary

Fields

Modifier and Type	Field and Description
protected java.lang.CharSequence	expr The JEXL string for this expression.
protected JexlNode	node The JEXL node for this expression.

Fields inherited from class org.apache.commons.jexl2.UnifiedJEXL.Expression

source

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	JexlBasedExpression(java.lang.CharSequence theExpr, JexlNode theNode, UnifiedJEXL.Expression theSource) Creates a JEXL interpretable expression.

Method Summary

Modifier and Type	Method and Description
java.lang.StringBuilder	asString(java.lang.StringBuilder strb) Adds this expression's string representation to a StringBuilder.
protected java.lang.Object	evaluate(Interpreter interpreter) Intreprets a sub-expression.
java.util.Set<java.util.List<java.lang.String>>	getVariables() Gets the list of variables accessed by this expression.
protected void	getVariables(java.util.Set<java.util.List<java.lang.String>> refs) Fills up the list of variables accessed by this expression.

Methods inherited from class org.apache.commons.jexl2.UnifiedJEXL.Expression

asString, evaluate, getSource, getType, isDeferred, isImmediate, prepare, prepare, toString

Methods inherited from class java.lang.Object

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

Field Detail

expr

protected final java.lang.CharSequence expr

The JEXL string for this expression.

node

protected final JexlNode node

The JEXL node for this expression.

Constructor Detail

JexlBasedExpression

protected JexlBasedExpression(java.lang.CharSequence theExpr,
                              JexlNode theNode,
                              UnifiedJEXL.Expression theSource)

Creates a JEXL interpretable expression.

Parameters:

theExpr - the expression as a string

theNode - the expression as an AST

theSource - the source expression if any

Method Detail

asString

public java.lang.StringBuilder asString(java.lang.StringBuilder strb)

Adds this expression's string representation to a StringBuilder.

Specified by:

asString in class UnifiedJEXL.Expression

Parameters:

strb - the builder to fill

Returns:

the builder argument

evaluate

protected java.lang.Object evaluate(Interpreter interpreter)

Intreprets a sub-expression.

Specified by:

evaluate in class UnifiedJEXL.Expression

Parameters:

interpreter - a JEXL interpreter

Returns:

the result of interpretation

getVariables

public java.util.Set<java.util.List<java.lang.String>> getVariables()

Gets the list of variables accessed by this expression.

This method will visit all nodes of the sub-expressions and extract all variables whether they are written in 'dot' or 'bracketed' notation. (a.b is equivalent to a['b']).

Overrides:

getVariables in class UnifiedJEXL.Expression

Returns:

the set of variables, each as a list of strings (ant-ish variables use more than 1 string) or the empty set if no variables are used

getVariables

protected void getVariables(java.util.Set<java.util.List<java.lang.String>> refs)

Fills up the list of variables accessed by this expression.

Overrides:

getVariables in class UnifiedJEXL.Expression

Parameters:

refs - the set of variable being filled