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Components learn about assets via injection. The @Inject annotation allows Assets to be injected into components as read-only properties. The path to the resource is specified using the Path annotation:

    @Inject
    @Path("context:images/tapestry_banner.gif")
    private Asset banner;

Assets are located within domains; these domains are identified by the prefix on the @Path annotation's value.

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You can use relative paths with domains (if you omit the prefix):

    @Inject
    @Path("../edit.png")
    private Asset icon;

Since you must omit the prefix, this only makes sense for components packaged in a library for reuse.

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Symbols inside the annotation value are expanded. This allows you to define a symbol and reference it as part of the path. For example, you could contribute a symbol named "skin.root" as "context:skins/basic" and then reference an asset from within it:

    @Inject
    @Path("${skin.root}/style.css")
    private Asset style;

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By default, Tapestry secures file extensions ".class', ".tml" and ".properties". The list can be extended by contributing to the ResourceDigestGenerator service contribution.

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Minimizing Assets

Since version 5.3, Tapestry provides a service, ResourceMinimizer, which will help to minimize all your static resources (principally CSS and JavaScript files).

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<dependency>
    <groupId>org.apache.tapestry</groupId>
    <artifactId>tapestry-yuicompressor</artifactId>
    <version>5.3.1</version>
</dependency>

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If you want to add your own minimizer for particular types of assets, you can contribute to the ResourceMinimizer service. The service configuration maps the MIME-TYPE of your resource to an implementation of the ResourceMinimizer interface.

@Contribute(ResourceMinimizer.class)
@Primary
public static void contributeMinimizers(MappedConfiguration<String, ResourceMinimizer> configuration)
{
    configuration.addInstance(" text/coffeescript", CoffeeScriptMinimizer.class);
}

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