org.apache.camel.language.simple

Class SimpleLanguage

java.lang.Object

org.apache.camel.support.LanguageSupport

org.apache.camel.language.simple.SimpleLanguage

All Implemented Interfaces:

CamelContextAware, IsSingleton, Language

Direct Known Subclasses:

FileLanguage

public class SimpleLanguage
extends LanguageSupport

A simple language which maps simple property style notations to access headers and bodies. Examples of supported expressions are:

• exchangeId to access the exchange id
• id to access the inbound message id
• in.body or body to access the inbound body
• in.body.OGNL or body.OGNL to access the inbound body using an OGNL expression
• mandatoryBodyAs(<classname>) to convert the in body to the given type, will throw exception if not possible to convert
• bodyAs(<classname>) to convert the in body to the given type, will return null if not possible to convert
• headerAs(<key>, <classname>) to convert the in header to the given type, will return null if not possible to convert
• out.body to access the inbound body
• in.header.foo or header.foo to access an inbound header called 'foo'
• in.header.foo[bar] or header.foo[bar] to access an inbound header called 'foo' as a Map and lookup the map with 'bar' as key
• in.header.foo.OGNL or header.OGNL to access an inbound header called 'foo' using an OGNL expression
• out.header.foo to access an outbound header called 'foo'
• property.foo to access the exchange property called 'foo'
• property.foo.OGNL to access the exchange property called 'foo' using an OGNL expression
• sys.foo to access the system property called 'foo'
• sysenv.foo to access the system environment called 'foo'
• exception.messsage to access the exception message
• threadName to access the current thread name
• date:<command>:<pattern> for date formatting using the SimpleDateFormat patterns. Supported commands are: now for current timestamp, in.header.xxx or header.xxx to use the Date object in the in header. out.header.xxx to use the Date object in the out header.
• bean:<bean expression> to invoke a bean using the BeanLanguage
• properties:<[locations]>:<key> for using property placeholders using the PropertiesComponent. The locations parameter is optional and you can enter multiple locations separated with comma.

The simple language supports OGNL notation when accessing either body or header.

The simple language now also includes file language out of the box which means the following expression is also supported:

• file:name to access the file name (is relative, see note below))
• file:name.noext to access the file name with no extension
• file:name.ext to access the file extension
• file:ext to access the file extension
• file:onlyname to access the file name (no paths)
• file:onlyname.noext to access the file name (no paths) with no extension
• file:parent to access the parent file name
• file:path to access the file path name
• file:absolute is the file regarded as absolute or relative
• file:absolute.path to access the absolute file path name
• file:length to access the file length as a Long type
• file:size to access the file length as a Long type
• file:modified to access the file last modified as a Date type
• date:<command>:<pattern> for date formatting using the SimpleDateFormat patterns. Additional Supported commands are: file for the last modified timestamp of the file. All the commands from SimpleLanguage is also available.

The relative file is the filename with the starting directory clipped, as opposed to path that will return the full path including the starting directory.
The only file is the filename only with all paths clipped.

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	allowEscape

Fields inherited from class org.apache.camel.support.LanguageSupport

RESOURCE

Constructor Summary

Constructors

Constructor and Description
SimpleLanguage() Default constructor.

Method Summary

Modifier and Type	Method and Description
static void	changeFunctionEndToken(String... endToken) Change the end tokens used for functions.
static void	changeFunctionStartToken(String... startToken) Change the start tokens used for functions.
Expression	createExpression(String expression) Creates an expression based on the given string input
Expression	createExpression(String expression, Class<?> resultType)
Predicate	createPredicate(String expression) Creates a predicate based on the given string input
static Expression	expression(String expression) Creates a new Expression.
static Predicate	predicate(String predicate) Creates a new Predicate.
void	setFunctionEndToken(String endToken) Change the end token used for functions.
void	setFunctionStartToken(String startToken) Change the start token used for functions.
static Expression	simple(String expression) Creates a new Expression.
static Expression	simple(String expression, Class<?> resultType) Creates a new Expression (or Predicate if the resultType is a Boolean, or boolean type).

Methods inherited from class org.apache.camel.support.LanguageSupport

getCamelContext, isSingleton, loadResource, setCamelContext

Methods inherited from class java.lang.Object

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

Field Detail

allowEscape

protected boolean allowEscape

Constructor Detail

SimpleLanguage

public SimpleLanguage()

Default constructor.

Method Detail

createPredicate

public Predicate createPredicate(String expression)

Description copied from interface: Language

Creates a predicate based on the given string input

Parameters:

expression - the expression

Returns:

the created predicate

createExpression

public Expression createExpression(String expression)

Description copied from interface: Language

Creates an expression based on the given string input

Parameters:

expression - the expression as a string input

Returns:

the created expression

simple

public static Expression simple(String expression)

Creates a new Expression.

Important: If you need to use a predicate (function to return true|false) then use predicate(String) instead.

simple

public static Expression simple(String expression,
                                Class<?> resultType)

Creates a new Expression (or Predicate if the resultType is a Boolean, or boolean type).

createExpression

public Expression createExpression(String expression,
                                   Class<?> resultType)

expression

public static Expression expression(String expression)

Creates a new Expression.

Important: If you need to use a predicate (function to return true|false) then use predicate(String) instead.

predicate

public static Predicate predicate(String predicate)

Creates a new Predicate.

changeFunctionStartToken

public static void changeFunctionStartToken(String... startToken)

Change the start tokens used for functions.

This can be used to alter the function tokens to avoid clashes with other frameworks etc.

The default start tokens is ${ and $simple{.

Parameters:

startToken - new start token(s) to be used for functions

changeFunctionEndToken

public static void changeFunctionEndToken(String... endToken)

Change the end tokens used for functions.

This can be used to alter the function tokens to avoid clashes with other frameworks etc.

The default end token is }

Parameters:

endToken - new end token(s) to be used for functions

setFunctionStartToken

public void setFunctionStartToken(String startToken)

Change the start token used for functions.

This can be used to alter the function tokens to avoid clashes with other frameworks etc.

The default start tokens is ${ and $simple{.

Parameters:

startToken - new start token to be used for functions

setFunctionEndToken

public void setFunctionEndToken(String endToken)

Change the end token used for functions.

This can be used to alter the function tokens to avoid clashes with other frameworks etc.

The default end token is }

Parameters:

endToken - new end token to be used for functions