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 // Copyright 2006, 2008, 2010 The Apache Software Foundation
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 // Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
Used as part of the support for classpath org.apache.tapestry5.Assets, to convert the Asset's org.apache.tapestry5.ioc.Resource to a URL that can be accessed by the client. The asset path, within the classpath, is converted into a shorter virtual path. The term "alias" here is generally referred to as "virtual folder" elsewhere.

Service configuration is a map from folder aliases (short names) to complete paths. Names should not start or end end with a slash. Generally, an alias should be a single name (not contain a slash). Paths should also not start or end with a slash. An example mapping would be mylib to com/example/mylib.

As originally envisioned, this service would simply optimize classpath assets, allowing the URL path for such assets to be shortened (and have a version number added, important for caching); thus the word "alias" makes sense ... it was responsible for creating an "alias" URL shorter than the default "classpath" URL.

Starting in Tapestry 5.2, this changed; all classpath assets must be "aliased" to a shorter URL path. Any URL that can not be shortened is now rejected. This simplifies creating new libraries, but also helps with security concerns, as it limits which portions of the classpath can ever be exposed to the user agent.

Tapestry automatically contributes a number of mappings: for the application root package itself (as alias "app") and for each library (via ComponentClassResolver.getFolderToPackageMapping());

public interface ClasspathAssetAliasManager
Takes a resource path to a classpath resource and adds the asset path prefix to the path. May also convert part of the path to an alias (based on the manager's configuration).

resourcePath resource path on the classpath (with no leading slash)
URL ready to send to the client
    String toClientURL(String resourcePath);

Reverses toClientURL(java.lang.String), stripping off the asset prefix, and re-expanding any aliased folders back to complete folders.

No longer used as of Tapestry 5.2, may be removed in a later release.
    String toResourcePath(String clientURL);

Returns the mappings used by the service: the keys are the folder aliases (i.e, "corelib") and the values are the corresponding paths (i.e., "org/apache/tapestry5/corelib"). This exists primarily so that can be created automatically for each mapping.

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