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 // Copyright 2009 The Apache Software Foundation
 // Licensed under the Apache License, Version 2.0 (the "License");
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Converts the path (or URI) of an asset into a new format. This is the hook needed to make use of a Content Delivery Network.

The default implementation of this is identity, the URI is passed through unchanged. Using a contribution to the service, you may override the default implementation.

public interface AssetPathConverter
Returns true if the converter returns that same converted path for any specific asset path (in which case, the converted asset path may be cached in component instance variables more aggresively). This value should be false if the converted path can vary for the same input path ... that is, if external factors (such as the identity of the user, or information obtained from the request) is involved in generating the final client URI.

true if invariant (and therefore cachable)
    boolean isInvariant();

Converts the default asset client URI to its final form, ready to be sent to the client. The default asset path is an absolute path (it starts with a leading slash) and incorporates the context path if any.

assetPath default asset path
a URI that can be sent to the client
    String convertAssetPath(String assetPath);
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