org.ofbiz.base.util.string
Class UelUtil

java.lang.Object
  org.ofbiz.base.util.string.UelUtil

public class UelUtil
extends java.lang.Object

Implements the Unified Expression Language (JSR-245).

Nested Class Summary

protected static class	UelUtil.BasicContext
protected static class	UelUtil.BasicValueExpression
protected static class	UelUtil.BasicVariableMapper
protected static class	UelUtil.ExtendedCompositeResolver Custom CompositeELResolver used to handle variable auto-vivify.
protected static class	UelUtil.ExtendedListResolver Custom ListELResolver used to handle OFBiz List syntax.
protected static class	UelUtil.ExtendedMapResolver Custom MapELResolver class used to accommodate LocalizedMap instances.

Field Summary

protected static ELResolver	defaultResolver
protected static ExpressionFactory	exprFactory
static java.lang.String	localizedMapLocaleKey
protected static java.lang.String	module

Constructor Summary

UelUtil()

Method Summary

static java.lang.Object	autoVivifyListOrMap(java.lang.Object property) Evaluates a property Object and returns a new List or Map.
static java.lang.Object	evaluate(java.util.Map<java.lang.String,? extends java.lang.Object> context, java.lang.String expression) Evaluates a Unified Expression Language expression and returns the result.
static java.lang.Object	evaluate(java.util.Map<java.lang.String,? extends java.lang.Object> context, java.lang.String expression, java.lang.Class expectedType) Evaluates a Unified Expression Language expression and returns the result.
static java.lang.String	prepareExpression(java.lang.String expression) Prepares an expression for evaluation by UEL.
static void	removeValue(java.util.Map<java.lang.String,java.lang.Object> context, java.lang.String expression) Evaluates a Unified Expression Language expression and sets the resulting object to null.
static java.lang.Object	resolveVariable(java.lang.String variable, java.util.Map<java.lang.String,java.lang.Object> variables, java.util.Locale locale)
static void	setValue(java.util.Map<java.lang.String,java.lang.Object> context, java.lang.String expression, java.lang.Class expectedType, java.lang.Object value) Evaluates a Unified Expression Language expression and sets the resulting object to the specified value.

Methods inherited from class java.lang.Object

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

Field Detail

module

protected static final java.lang.String module

localizedMapLocaleKey

public static final java.lang.String localizedMapLocaleKey

exprFactory

protected static final ExpressionFactory exprFactory

defaultResolver

protected static final ELResolver defaultResolver

Constructor Detail

UelUtil

public UelUtil()

Method Detail

evaluate

public static java.lang.Object evaluate(java.util.Map<java.lang.String,? extends java.lang.Object> context,
                                        java.lang.String expression)

Evaluates a Unified Expression Language expression and returns the result.

Parameters:

context - Evaluation context (variables)

expression - UEL expression

Returns:

Result object

Throws:

javax.el.* - exceptions

evaluate

public static java.lang.Object evaluate(java.util.Map<java.lang.String,? extends java.lang.Object> context,
                                        java.lang.String expression,
                                        java.lang.Class expectedType)

Evaluates a Unified Expression Language expression and returns the result.

Parameters:

context - Evaluation context (variables)

expression - UEL expression

expectedType - The expected object Class to return

Returns:

Result object

Throws:

javax.el.* - exceptions

setValue

public static void setValue(java.util.Map<java.lang.String,java.lang.Object> context,
                            java.lang.String expression,
                            java.lang.Class expectedType,
                            java.lang.Object value)

Evaluates a Unified Expression Language expression and sets the resulting object to the specified value.

Parameters:

context - Evaluation context (variables)

expression - UEL expression

expectedType - The expected object Class to set

Throws:

javax.el.* - exceptions

removeValue

public static void removeValue(java.util.Map<java.lang.String,java.lang.Object> context,
                               java.lang.String expression)

Evaluates a Unified Expression Language expression and sets the resulting object to null.

Parameters:

context - Evaluation context (variables)

expression - UEL expression

Throws:

javax.el.* - exceptions

autoVivifyListOrMap

public static java.lang.Object autoVivifyListOrMap(java.lang.Object property)

Evaluates a property Object and returns a new List or Map. If property is not a String object type and it evaluates to an integer value, a new List instance is returned, otherwise a new Map instance is returned.

Parameters:

property - Property Object to be evaluated

Returns:

New List or Map

prepareExpression

public static java.lang.String prepareExpression(java.lang.String expression)

Prepares an expression for evaluation by UEL. The OFBiz syntax is converted to UEL-compatible syntax and the resulting expression is returned.

Parameters:

expression - Expression to be converted

Returns:

Converted expression

resolveVariable

public static java.lang.Object resolveVariable(java.lang.String variable,
                                               java.util.Map<java.lang.String,java.lang.Object> variables,
                                               java.util.Locale locale)