# Package groovy.lang

Core Groovy language classes for implementing data structures, closures, metadata and so forth.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  AdaptingMetaClass | An interface for MetaClass instances that "adapt" other MetaClass instances such as a proxy or delegating MetaClass.
  Buildable |
  ClosureInvokingMethod | An interface for MetaMethods that invoke closures to implements.
  GeneratedGroovyProxy | An interface implemented by some Groovy proxies which gives access to the proxied object.
  GroovyCallable<V> | A special "marker" style interface allowing Groovy classes to implement both Runnable and Callable yet give preference to Runnable (for backwards compatibility) for APIs having both Runnable and Callable methods.
  GroovyInterceptable | Marker interface used to notify that all methods should be intercepted through the `invokeMethod` mechanism of `GroovyObject`.
  GroovyObject | The interface implemented by all Groovy objects.
  GroovyResourceLoader | Allows frameworks that integrate with Groovy to determine how Groovy files are resolved.
  Interceptor | Implementers of this interface can be registered in the ProxyMetaClass for notifications about method calls for objects managed by the ProxyMetaClass.
  MetaClass | A MetaClass within Groovy defines the behaviour of any given Groovy or Java class.
  MetaClassRegistry | A MetaClassRegistry is an object that is responsible for managing the a cache of MetaClass instances.
  MetaClassRegistryChangeEventListener | A listener called whenever a constant MetaClass is set, removed or replaced.
  MetaObjectProtocol | An interface that defines the API usable by clients of Groovy's Meta Object Protocol (MOP).
  MutableMetaClass | An interface that defines methods that implementers of mutable Meta classes should specify.
  PropertyAccessInterceptor | An interface that adds the ability to intercept property getters/setters
  Range<T extends java.lang.Comparable> | A Range represents the list of discrete items between some starting (or `from`) value and working up towards some ending (or `to`) value.
  Writable | Represents an object which is capable of writing itself to a text stream in a more efficient format than just creating a toString() representation of itself.

- Class Summary
  Class | Description
  --- | ---
  BenchmarkInterceptor | Interceptor that registers the timestamp of each method call before and after invocation.
  Binding | Represents the variable bindings of a script which can be altered from outside the script object or created outside of a script and passed into it.
  Closure<V> | Represents any closure object in Groovy.
  DelegatingMetaClass |
  EmptyRange<T extends java.lang.Comparable> | Constructing Ranges like 0..<0
  ExpandoMetaClass | ExpandoMetaClass is a MetaClass that behaves like an Expando, allowing the addition or replacement of methods, properties and constructors on the fly.
  ExpandoMetaClassCreationHandle | A handle for the MetaClassRegistry that changes all classes loaded into the Grails VM to use ExpandoMetaClass instances
  GroovyClassLoader | A ClassLoader which can load Groovy classes.
  GroovyClassLoader.ClassCollector |
  GroovyClassLoader.InnerLoader |
  GroovyCodeSource | CodeSource wrapper class that allows specific security policies to be associated with a class compiled from groovy source.
  GroovyObjectSupport | A useful base class for Java objects wishing to be Groovy objects
  GroovyShell | Represents a groovy shell capable of running arbitrary groovy scripts
  GroovySystem |
  GString | Represents a String which contains embedded values such as "hello there ${user} how are you?" which can be evaluated lazily.
  IntRange | Represents a list of Integer objects starting at a specified `from` value up (or down) to and potentially including a given `to` value.
  ListWithDefault<T> | A wrapper for `List` which automatically grows the list when either `ListWithDefault.get(int)` or `ListWithDefault.getAt(int)` is called with an index greater than or equal to `size()`.
  MapWithDefault<K,V> | A wrapper for Map which allows a default value to be specified.
  MetaArrayLengthProperty | Represents the length property of an array
  MetaBeanProperty | Represents a property on a bean which may have a getter and/or a setter
  MetaClassImpl | Allows methods to be dynamically added to existing classes at runtime
  MetaClassImpl.Index |
  MetaClassImpl.MetaConstructor | This is a helper class introduced in Groovy 2.1.0, which is used only by indy.
  MetaClassRegistry.MetaClassCreationHandle | Class used as base for the creation of MetaClass implementations.
  MetaClassRegistryChangeEvent | An event used to propagate meta class updates
  MetaExpandoProperty | Represents a property in an Expando object
  MetaMethod | Represents a Method on a Java object a little like `Method` except without using reflection to invoke the method
  MetaProperty | Represents a property on a bean which may have a getter and/or a setter
  NonEmptySequence | Represents a sequence of one or more objects of a given type.
  NumberRange | Represents an immutable list of Numbers from a value to a value with a particular step size.
  ObjectRange | Represents an inclusive list of objects from a value to a value using comparators.
  ParameterArray | Distinguish a parameter array from Object[].
  PropertyValue |
  ProxyMetaClass | As subclass of MetaClass, ProxyMetaClass manages calls from Groovy Objects to POJOs.
  Reference<T> | Represents a reference to a value
  Script | This object represents a Groovy script
  Sequence | Represents a sequence of zero or more objects of a given type.
  SpreadMap | Helper to turn a list with an even number of elements into a Map.
  TracingInterceptor |
  Tuple<E> | Represents a list of Objects.
  Tuple1<T1> | Represents a list of 1 typed Object.
  Tuple2<T1,T2> | Represents a list of 2 typed Objects.
  Tuple3<T1,T2,T3> | Represents a list of 3 typed Objects.
  Tuple4<T1,T2,T3,T4> | Represents a list of 4 typed Objects.
  Tuple5<T1,T2,T3,T4,T5> | Represents a list of 5 typed Objects.
  Tuple6<T1,T2,T3,T4,T5,T6> | Represents a list of 6 typed Objects.
  Tuple7<T1,T2,T3,T4,T5,T6,T7> | Represents a list of 7 typed Objects.
  Tuple8<T1,T2,T3,T4,T5,T6,T7,T8> | Represents a list of 8 typed Objects.
  Tuple9<T1,T2,T3,T4,T5,T6,T7,T8,T9> | Represents a list of 9 typed Objects.

- Exception Summary
  Exception | Description
  --- | ---
  ClosureException | An exception thrown by a closure invocation
  DeprecationException | Use this exception to mark a method implementation as being deprecated.
  GroovyRuntimeException | An exception thrown by the interpreter
  IllegalPropertyAccessException | An exception occurred if a dynamic property dispatch fails with a field not accessible.
  IncorrectClosureArgumentsException | An exception occurred when invoking a Closure with the wrong number and/or types of arguments
  MissingClassException | An exception occurred if a dynamic method dispatch fails with an unknown class.
  MissingFieldException | An exception occurred if a dynamic field dispatch fails with an unknown field.
  MissingMethodException | An exception occurred if a dynamic method dispatch fails with an unknown method.
  MissingPropertyException | An exception occurred if a dynamic property dispatch fails with an unknown property.
  ReadOnlyPropertyException | This exception is thrown if an attempt is made to set a read only property
  SpreadListEvaluatingException |
  SpreadMapEvaluatingException |
  StringWriterIOException | An IO exception occurred trying to append to a StringWriter which should never happen.

- Annotation Types Summary
  Annotation Type | Description
  --- | ---
  Category | Transforms an instance-style Groovy class or interface to become a static-style conventional Groovy category.
  Delegate | Annotation to automatically delegate part of the functionality of an owner class to the annotated delegation target.
  DelegatesTo | This annotation can be used by API or DSL writers to document parameters which accept a closure.
  DelegatesTo.Target | Parameter annotation used to specify the delegate for a `@DelegatesTo` annotated parameter of the same method.
  Grab | Used to grab the referenced artifact and its dependencies and make it available on the Classpath.
  GrabConfig | Used to modify the grape configuration for grab requests.
  GrabExclude | Used to exclude an indirectly referenced artifact (a transitive dependency) from the classpath.
  GrabResolver | Used to add a repository for resolving Grape dependencies.
  Grapes | Sometimes we will need more than one grab per class, but we can only add one annotation type per annotatable node.
  Lazy | Field annotation to simplify lazy initialization.
  Mixin | Deprecated static mixins have been deprecated in favour of traits (trait keyword).
  Newify | Annotation that supports writing constructor call expressions without the 'new' keyword.
  Singleton | Class annotation to make a singleton class.

## Package groovy.lang Description

Core Groovy language classes for implementing data structures, closures, metadata and so forth.