# Package com.google.gwt.core.ext

Classes used to extend the GWT compiler. Developers will use the classes in this package only when creating custom code `generators` or `linkers`.

- Interface Summary
  Interface | Description
  --- | ---
  CachedGeneratorResult | An interface to represent the cached results from a previous generator invocation.
  ConfigurationProperty | A named configuration (property, values) pair.
  GeneratorContext | Provides metadata to deferred binding generators.
  LinkerContext | Provides access to data about the linking process.
  PropertyOracle | Provides deferred binding property values.
  RebindRuleResolver | An interface for encapsulating rebind rule resolution.
  SelectionProperty | A named deferred binding (property, value) pair for use in generators.

- Class Summary
  Class | Description
  --- | ---
  CachedPropertyInformation | A container for saving lists of deferred-binding and configuration properties to be compared subsequently with a PropertyOracle.
  DefaultConfigurationProperty | Default immutable implementation of ConfigurationProperty that receives its values in its constructor.
  DefaultSelectionProperty | Default immutable implementation of SelectionProperty that receives its values in its constructor.
  DelegatingGeneratorContext | An abstract generator context class which delegates all methods to a provided baseContext.
  Generator | Generates source code for subclasses during deferred binding requests.
  IncrementalGenerator | An extension to the `Generator` class which supports incremental generation.
  Linker | Defines a linker for the GWT compiler.
  NonIncrementalGeneratorContext | A wrapper to access a base `GeneratorContext` instance but with generator result caching disabled.
  RebindResult | A class for returning the result of a rebind operation.
  ServletContainer | An instance of a servlet container that can be used by the shell.
  ServletContainerLauncher | Defines the service provider interface for launching servlet containers that can be used by the GWT development mode.
  StubGeneratorContext | An abstract generator context class which by default throws UnsupportedOperationException for all methods.
  SubsetFilteringPropertyOracle | A property oracle that prevents access to any properties not named in its predefined set. Used by the generator driver framework to limit property access for the purpose of forcing generators to accurately declare their property dependencies.
  TreeLogger | An interface used to log messages in deferred binding generators.
  TreeLogger.HelpInfo | Provides extra information to the user, generally details of what caused the problem or what the user should do to fix the problem.

- Enum Summary
  Enum | Description
  --- | ---
  RebindMode | A mode to indicate how incremental generator output should be integrated by the deferred binding implementation.
  TreeLogger.Type | A type-safe enum of all possible logging severity types.

- Exception Summary
  Exception | Description
  --- | ---
  BadPropertyValueException | Thrown when a deferred binding property contains an invalid value.
  UnableToCompleteException | Used to indicate that some part of a multi-step process failed.

- Annotation Types Summary
  Annotation Type | Description
  --- | ---
  Generator.RunsLocal | An optional annotation indicating that a Generator can be run with local information during incremental compilation.