...
This component is provided out of the box in camel-core and hence no additional JARs is needed. You only have to include additional Camel components if the language of choice mandates it, such as using Groovy or JavaScript languages.
URI format
| Code Block |
|---|
language://languageName[:script][?options]
|
And from Camel 2.11 onwards you can refer to an external resource for the script using same notation as supported by the other Languages in Camel
| Code Block |
|---|
language://languageName:resource:scheme:location][?options]
|
...
The component supports the following options.
| Div |
|---|
| class | confluenceTableSmall |
|---|
|
Name | Default Value | Type | Description |
|---|
languageName
| null
| String
| The name of the Language to use, such as simple, groovy, javascript etc. This option is mandatory. | script
| null
| String
| The script to execute. | transform
| true
| boolean
| Whether or not the result of the script should be used as the new message body. By setting to false the script is executed but the result of the script is discarded. | contentCache
| true
| boolean
| Camel 2.9: Whether to cache the script if loaded from a resource.
Note: from Camel 2.10.3 a cached script can be forced to reload at runtime via JMX using the clearContentCache operation. | cacheScript
| false
| boolean
| Camel |
|
| Wiki Markup |
|---|
{div:class=confluenceTableSmall}
|| Name || Default Value || Type || Description ||
| {{languageName}} | {{null}} | {{String}} | The name of the [Language|Languages] to use, such as {{simple}}, {{groovy}}, {{javascript}} etc. This option is mandatory. |
| {{script}} | {{null}} | {{String}} | The script to execute. |
| {{transform}} | {{true}} | {{boolean}} | Whether or not the result of the script should be used as the new message body. By setting to {{false}} the script is executed but the result of the script is discarded. |
| {{contentCache}} | {{true}} | {{boolean}} | *Camel 2.9:* Whether to cache the script if loaded from a resource.
Note: from *Camel 2.10.3* a cached script can be forced to reload at runtime via JMX using the clearContentCache operation. |
| {{cacheScript}} | {{false}} | {{boolean}} | *Camel * on. |
{div}on. | binary
| false
| boolean
| Camel 2.14.1: Whether the script is binary content. This is intended to be used for loading resources using the Constant language, such as loading binary files. |
|
The following message headers can be used to affect the behavior of the component
| Div |
|---|
| class | confluenceTableSmall |
|---|
|
Header | Description |
|---|
CamelLanguageScript
| The script to execute provided in the header. Takes precedence over script configured on the endpoint. |
|
| Wiki Markup |
|---|
| {div:class=confluenceTableSmall}
|| Header || Description ||
| {{CamelLanguageScript}} | The script to execute provided in the header. Takes precedence over script configured on the endpoint. |
{div} |
Examples
For example you can use the Simple language to Message Translator a message:
| Wiki Markup |
|---|
{snippet:id=e1|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/language/LanguageRouteTest.java} |
In case you want to convert the message body type you can do this as well:
| Wiki Markup |
|---|
{snippet:id=e1|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/language/LanguageRouteConvertBodyTest.java} |
You can also use the
Groovy language, such as this example where the input message will by multiplied with 2:
| Wiki Markup |
|---|
{snippet:id=e1|lang=java|url=camel/trunk/components/camel-groovy/src/test/java/org/apache/camel/language/groovy/LanguageGroovyRouteTest.java} |
You can also provide the script as a header as shown below. Here we use
XPath language to extract the text from the
<foo> tag.
| Code Block |
|---|
|
Object out = producer.requestBodyAndHeader("language:xpath", "<foo>Hello World</foo>", Exchange.LANGUAGE_SCRIPT, "/foo/text()");
assertEquals("Hello World", out);
|
...
For example to load a script from the classpath:
| Wiki Markup |
|---|
{snippet:id=e1|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/language/LanguageLoadScriptFromClasspathTest.java} |
By default the script is loaded once and cached. However you can disable the
contentCache option and have the script loaded on each evaluation.
For example if the file myscript.txt is changed on disk, then the updated script is used:
| Wiki Markup |
|---|
{snippet:id=e1|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/language/LanguageLoadScriptFromFileUpdateTest.java} |
From
Camel 2.11 onwards you can refer to the resource similar to the other
Languages in Camel by prefixing with
"resource:" as shown below:
| Wiki Markup |
|---|
{snippet:id=e1|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/language/LanguageResourceLoadScriptFromClasspathTest.java} |
| Include Page |
|---|
| Endpoint See Also |
|---|
| Endpoint See Also |
|---|
|
