org.apache.camel.util

Class OgnlHelper

java.lang.Object

org.apache.camel.util.OgnlHelper

public final class OgnlHelper
extends Object

Helper for Camel OGNL (Object-Graph Navigation Language) expressions.

Method Summary

Modifier and Type	Method and Description
static boolean	isInvalidValidOgnlExpression(String expression)
static boolean	isNullSafeOperator(String ognlExpression) Tests whether or not the given Camel OGNL expression is using the null safe operator or not.
static KeyValueHolder<String,String>	isOgnlIndex(String ognlExpression)
static boolean	isValidOgnlExpression(String expression) Tests whether or not the given String is a Camel OGNL expression.
static String	removeLeadingOperators(String ognlExpression) Removes any leading operators from the Camel OGNL expression.
static String	removeOperators(String ognlExpression)
static String	removeTrailingOperators(String ognlExpression) Removes any trailing operators from the Camel OGNL expression.
static List<String>	splitOgnl(String ognl) Regular expression with repeating groups is a pain to get right and then nobody understands the reg exp afterwards.
static void	validateMethodName(String method) Validates whether the method name is using valid java identifiers in the name Will throw IllegalArgumentException if the method name is invalid.

Methods inherited from class java.lang.Object

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

Method Detail

isValidOgnlExpression

public static boolean isValidOgnlExpression(String expression)

Tests whether or not the given String is a Camel OGNL expression.

An expression is considered an OGNL expression when it contains either one of the following chars: . or [

Parameters:

expression - the String

Returns:

true if a Camel OGNL expression, otherwise false.

isInvalidValidOgnlExpression

public static boolean isInvalidValidOgnlExpression(String expression)

validateMethodName

public static void validateMethodName(String method)

Validates whether the method name is using valid java identifiers in the name Will throw IllegalArgumentException if the method name is invalid.

isNullSafeOperator

public static boolean isNullSafeOperator(String ognlExpression)

Tests whether or not the given Camel OGNL expression is using the null safe operator or not.

Parameters:

ognlExpression - the Camel OGNL expression

Returns:

true if the null safe operator is used, otherwise false.

removeLeadingOperators

public static String removeLeadingOperators(String ognlExpression)

Removes any leading operators from the Camel OGNL expression.

Will remove any leading of the following chars: ? or .

Parameters:

ognlExpression - the Camel OGNL expression

Returns:

the Camel OGNL expression without any leading operators.

removeTrailingOperators

public static String removeTrailingOperators(String ognlExpression)

Removes any trailing operators from the Camel OGNL expression.

Parameters:

ognlExpression - the Camel OGNL expression

Returns:

the Camel OGNL expression without any trailing operators.

removeOperators

public static String removeOperators(String ognlExpression)

isOgnlIndex

public static KeyValueHolder<String,String> isOgnlIndex(String ognlExpression)

splitOgnl

public static List<String> splitOgnl(String ognl)

Regular expression with repeating groups is a pain to get right and then nobody understands the reg exp afterwards. So we use a bit ugly/low-level Java code to split the OGNL into methods.

Parameters:

ognl - the ognl expression

Returns:

a list of methods, will return an empty list, if ognl expression has no methods

Throws:

IllegalArgumentException - if the last method has a missing ending parenthesis