org.apache.tapestry5.services
Interface ComponentClassResolver

All Known Implementing Classes:

ComponentClassResolverImpl

@UsesConfiguration(value=LibraryMapping.class)
public interface ComponentClassResolver

Resolves page names and component types to fully qualified class names. Pages and components may be provided by the application or inside a mapped package. Page names often appear inside URLs, and component types often appear in component template (when specifying the type of an embedded component).

The service is configured using a collection of LibraryMappings. Each mapping maps a prefix, such as "core" to a root package name, such as "org.apache.tapestry5.corelib". The root package is expected to have sub-packages: "pages", "components", "mixins" and "base" ("base" is for base classes).

The resolver performs a search of the classpath (via ClassNameLocator), to build up a set of case-insensitive maps from logical page name, component type, or mixin type to fully qualified class name.

Certain ambiguities occur if mapped packages overlap, either in terms of the the prefixes or the package names. Keep things clearly separate to avoid lookup problems.

Method Summary

String	canonicalizePageName(String pageName) Returns the canonical form of a page name.
Map<String,ControlledPackageType>	getControlledPackageMapping() Used to identify which packages are controlled packages (from which components are loaded).
Map<String,String>	getFolderToPackageMapping() A mapping from virtual folder name to a package name (used for converting classpath Assets to client URLs).
List<String>	getPageNames() Returns a list of all page names, in sorted order.
boolean	isPage(String pageClassName) Returns true if the class name is specifically a page class, and not a component, mixin or base class.
boolean	isPageName(String pageName) For a particular path, determines if the path is a logical page name.
String	resolveComponentTypeToClassName(String componentType) Converts a component type (a logical component name such as might be used inside a template or annotation) into a fully qualified class name.
String	resolveMixinTypeToClassName(String mixinType) Converts a logical mixin type (as with component types) into a fully qualified class name.
String	resolvePageClassNameToPageName(String pageClassName) Converts a fully qualified page class name into a page name (often, for inclusion as part of the URI).
String	resolvePageNameToClassName(String pageName) Converts a logical page name (such as might be encoded into a URL) into a fully qualified class name.

Method Detail

resolvePageNameToClassName

String resolvePageNameToClassName(String pageName)

Converts a logical page name (such as might be encoded into a URL) into a fully qualified class name. The case of the page name is irrelevant.

Parameters:

pageName - page name

Returns:

fully qualified class name for the page

Throws:

UnknownValueException - if the name does not match a known page class

isPageName

boolean isPageName(String pageName)

For a particular path, determines if the path is a logical page name. The check is case insensitive.

Parameters:

pageName - potential logical page name

Returns:

true if the page name is valid

getPageNames

List<String> getPageNames()

Returns a list of all page names, in sorted order.

resolvePageClassNameToPageName

String resolvePageClassNameToPageName(String pageClassName)

Converts a fully qualified page class name into a page name (often, for inclusion as part of the URI). This value may later be passed to resolvePageNameToClassName(String).

Parameters:

pageClassName - fully qualified name of a page class

Returns:

equivalent logical page name

Throws:

IllegalArgumentException - if the name can not be resolved

canonicalizePageName

String canonicalizePageName(String pageName)

Returns the canonical form of a page name. The canonical form uses character case matching the underlying class name.

Throws:

UnknownValueException - if the page name does not match a logical page name

resolveComponentTypeToClassName

String resolveComponentTypeToClassName(String componentType)

Converts a component type (a logical component name such as might be used inside a template or annotation) into a fully qualified class name. Case is ignored in resolving the name.

Parameters:

componentType - a logical component type

Returns:

fully qualified class name

Throws:

UnknownValueException - if the component type can not be resolved

resolveMixinTypeToClassName

String resolveMixinTypeToClassName(String mixinType)

Converts a logical mixin type (as with component types) into a fully qualified class name. Case is ignored when resolving the name.

Parameters:

mixinType - a logical mixin type

Returns:

fully qualified class name

Throws:

UnknownValueException - if the mixin type can not be resolved

getFolderToPackageMapping

Map<String,String> getFolderToPackageMapping()

A mapping from virtual folder name to a package name (used for converting classpath Assets to client URLs). This is derived from the contributed LibraryMappings.

It is allowed to contribute multiple root packages as a single folder name. In this case, the best common package name is used. For example, if both com.example.main and com.example.extras is mapped to folder "example", then the package mapping for "example" will be com.example.

Since:

5.2.0

See Also:

ClasspathAssetAliasManager

getControlledPackageMapping

Map<String,ControlledPackageType> getControlledPackageMapping()

Used to identify which packages are controlled packages (from which components are loaded). Future expansion may allow for additional packages which are live reloaded but not components (or perhaps are transformed, but not as components).

Returns:

a mapping from package name to ControlledPackageType.

Since:

5.3

isPage

boolean isPage(String pageClassName)

Returns true if the class name is specifically a page class, and not a component, mixin or base class.

Parameters:

pageClassName -

Returns:

true if a page class

Since:

5.3