Package org.codehaus.groovy.runtime

Class CurriedClosure<V>

java.lang.Object
groovy.lang.GroovyObjectSupport
groovy.lang.Closure<V>
org.codehaus.groovy.runtime.CurriedClosure<V>
All Implemented Interfaces:
GroovyCallable<V>, GroovyObject, Serializable, Cloneable, Runnable, Callable<V>
public final class CurriedClosure<V> extends Closure<V>
A wrapper for Closure to support currying. Normally used only internally through the curry(), rcurry() or ncurry() methods on Closure.

Typical usages: 

 // normal usage
 def unitAdder = { first, second, unit -> "${first + second} $unit" }
 assert unitAdder(10, 15, "minutes") == "25 minutes"
 assert unitAdder.curry(60)(15, "minutes") == "75 minutes"
 def minuteAdder = unitAdder.rcurry("minutes")
 assert minuteAdder(15, 60) == "75 minutes"

 // explicit creation
 import org.codehaus.groovy.runtime.CurriedClosure
 assert new CurriedClosure(unitAdder, 45)(15, "minutes") == "60 minutes"
 assert new CurriedClosure(unitAdder, "six", "ty")("minutes") == "sixty minutes"
Notes:
  • Caters for Groovy's lazy (rcurry) and eager (ncurry) calculation of argument position
See Also:

  • Constructor Details

    • CurriedClosure

      public CurriedClosure(int index, Closure<V> uncurriedClosure, Object... arguments)
      Parameters:
      index - the position where the parameters should be injected (-ve for lazy)
      uncurriedClosure - the closure to be called after the curried parameters are injected
      arguments - the supplied parameters

    • CurriedClosure

      public CurriedClosure(Closure<V> uncurriedClosure, Object... arguments)

  • Method Details

    • call

      public V call(Object argument)
      Fast path for the dominant rcurry/curry shape — one curried argument and a single incoming argument against a binary owner. Skips the wrapping Object[1] that Closure.call(Object) would otherwise allocate before dispatch, leaving just the one combined Object[2] that the underlying call already requires.
      Overrides:
      call in class Closure<V>
      Parameters:
      argument - could be a single value or a List of values
      Returns:
      The value if applicable or null if there is no return statement in the closure.

    • getUncurriedArguments

      public Object[] getUncurriedArguments(Object... arguments)

    • setDelegate

      public void setDelegate(Object delegate)
      Description copied from class: Closure
      Allows the delegate to be changed such as when performing markup building
      Overrides:
      setDelegate in class Closure<V>
      Parameters:
      delegate - the new delegate

    • getDelegate

      public Object getDelegate()
      Overrides:
      getDelegate in class Closure<V>
      Returns:
      the delegate Object to which method calls will go which is typically the outer class when the closure is constructed

    • getOwner

      public Closure<V> getOwner()
      Overrides:
      getOwner in class Closure<V>
      Returns:
      the owner Object to which method calls will go which is typically the outer class when the closure is constructed

    • setResolveStrategy

      public void setResolveStrategy(int resolveStrategy)
      Description copied from class: Closure
      Sets the strategy which the closure uses to resolve property references and methods. The default is Closure.OWNER_FIRST
      Overrides:
      setResolveStrategy in class Closure<V>
      Parameters:
      resolveStrategy - The resolve strategy to set
      See Also:

    • getResolveStrategy

      public int getResolveStrategy()
      Description copied from class: Closure
      Gets the strategy which the closure uses to resolve methods and properties
      Overrides:
      getResolveStrategy in class Closure<V>
      Returns:
      The resolve strategy
      See Also:

    • clone

      public Object clone()
      Description copied from class: Closure
      Overrides:
      clone in class Closure<V>

    • getParameterTypes

      public Class[] getParameterTypes()
      Overrides:
      getParameterTypes in class Closure<V>
      Returns:
      the parameter types of the longest doCall method of this closure