Interface ComponentClassResolver

All Known Implementing Classes:
ComponentClassResolverImpl

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 templates (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 Details

    • resolvePageNameToClassName

      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

      Returns a list of all page names, in sorted order. These are the "canonical" page names.
    • getComponentNames

      Returns a list of all component names, in sorted order. These are the "canonical" component names.
      Since:
      5.4
    • getMixinNames

      Returns a list of all mixin names, in sorted order. These are the "canonical" mixin names.
      Since:
      5.4
    • resolvePageClassNameToPageName

      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

      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

      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

      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

      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:
    • getLibraryNames

      Returns the names of all libraries (as configured). This does not include the application itself (which is a library with the virtual path of empty string).
      Returns:
      sorted names of libraries
      Since:
      5.4
    • 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
    • getLibraryNameForClass

      Given a class name of a component class, returns the library name (as defined by a contributed library name).
      Parameters:
      className -
      Returns:
      library name
      Throws:
      IllegalArgumentException - if the class can't be matched to a contributed root package
    • getLibraryMappings

      Returns the library mappings.
    • getLogicalName

      @IncompatibleChange(release="5.8.3", details="Added method") String getLogicalName(String className)
      Returns the logical name for a page, component or mixin fully classified class name.
    • getClassName

      @IncompatibleChange(release="5.8.3", details="Added method") String getClassName(String logicalName)
      Returns the class name for a page, component or class given its logical name.