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## groovy.lang
Class EmptyRange

    java.lang.Object
      java.util.AbstractCollection
          java.util.AbstractList
              groovy.lang.EmptyRange

All Implemented Interfaces:
  Range, Iterable, Collection, List

    public class EmptyRange

extends AbstractList
implements Range

Constructing Ranges like 0..<0

Author:
  Dierk Koenig, Edwin Tellman

Field Summary
`protected Comparable` | `at` The value at which the range originates (may be `null`).

Fields inherited from class java.util.AbstractList
`modCount`

Constructor Summary
`EmptyRange(Comparable at)` Creates a new `EmptyRange`.

Method Summary
`boolean` | `add(Object o)` Always throws `UnsupportedOperationException` for an empty range.
`boolean` | `addAll(Collection c)` Always throws `UnsupportedOperationException` for an empty range.
`boolean` | `addAll(int index, Collection c)` Always throws `UnsupportedOperationException` for an empty range.
`boolean` | `containsWithinBounds(Object o)` Never true for an empty range.
`Object` | `get(int index)` Always throws `IndexOutOfBoundsException` for an empty range.
`Comparable` | `getFrom()` Gets the lower value in the range.
`Comparable` | `getTo()` Gets the lower value in the range.
`String` | `inspect()`
`boolean` | `isReverse()` Never true for an empty range.
`Object` | `remove(int index)` Always throws `UnsupportedOperationException` for an empty range.
`boolean` | `remove(Object o)` Always throws `UnsupportedOperationException` for an empty range.
`boolean` | `removeAll(Collection c)` Always throws `UnsupportedOperationException` for an empty range.
`boolean` | `retainAll(Collection c)` Always throws `UnsupportedOperationException` for an empty range.
`Object` | `set(int index, Object element)` Always throws `UnsupportedOperationException` for an empty range.
`int` | `size()` Always 0 for an empty range.
`List` | `step(int step)` Always returns an empty list for an empty range.
`void` | `step(int step, Closure closure)` Always does nothing for an empty range.
`String` | `toString()`

Methods inherited from class java.util.AbstractList
`add, clear, equals, hashCode, indexOf, iterator, lastIndexOf, listIterator, listIterator, removeRange, subList`

Methods inherited from class java.util.AbstractCollection
`contains, containsAll, isEmpty, toArray, toArray`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Methods inherited from interface java.util.List
`add, clear, contains, containsAll, equals, hashCode, indexOf, isEmpty, iterator, lastIndexOf, listIterator, listIterator, subList, toArray, toArray`

Field Detail

### at

    protected Comparable at

  The value at which the range originates (may be `null`).

Constructor Detail

### EmptyRange

    public EmptyRange(Comparable at)

  Creates a new `EmptyRange`.

  Parameters:
    `at` - the value at which the range starts (may be `null`).

Method Detail

### getFrom

    public Comparable getFrom()

  Gets the lower value in the range.

  Specified by:
    `getFrom` in interface `Range`
  Returns:
    the lower value in the range.

### getTo

    public Comparable getTo()

  Gets the lower value in the range.

  Specified by:
    `getTo` in interface `Range`
  Returns:
    the upper value in the range

### isReverse

    public boolean isReverse()

  Never true for an empty range.

  Specified by:
    `isReverse` in interface `Range`
  Returns:
    `false`

### containsWithinBounds

    public boolean containsWithinBounds(Object o)

  Never true for an empty range.

  Specified by:
    `containsWithinBounds` in interface `Range`
  Parameters:
    `o` - the object to check against the boundaries of the range
  Returns:
    `false`

### inspect

    public String inspect()

  Specified by:
    `inspect` in interface `Range`
  Returns:
    the verbose `String` representation of this `Range` as would be typed into a console to create the `Range` instance

### toString

    public String toString()

  Overrides:
    `toString` in class `AbstractCollection`

### size

    public int size()

  Always 0 for an empty range.

  Specified by:
    `size` in interface `Collection`
  Specified by:
    `size` in interface `List`
  Specified by:
    `size` in class `AbstractCollection`
  Returns:
    0

### get

    public Object get(int index)

  Always throws `IndexOutOfBoundsException` for an empty range.

  Specified by:
    `get` in interface `List`
  Specified by:
    `get` in class `AbstractList`
  Throws:
    `IndexOutOfBoundsException` - always

### add

    public boolean add(Object o)

  Always throws `UnsupportedOperationException` for an empty range.

  Specified by:
    `add` in interface `Collection`
  Specified by:
    `add` in interface `List`
  Overrides:
    `add` in class `AbstractList`
  Throws:
    `UnsupportedOperationException` - always

### addAll

    public boolean addAll(int index,
                          Collection c)

  Always throws `UnsupportedOperationException` for an empty range.

  Specified by:
    `addAll` in interface `List`
  Overrides:
    `addAll` in class `AbstractList`
  Throws:
    `UnsupportedOperationException`

### addAll

    public boolean addAll(Collection c)

  Always throws `UnsupportedOperationException` for an empty range.

  Specified by:
    `addAll` in interface `Collection`
  Specified by:
    `addAll` in interface `List`
  Overrides:
    `addAll` in class `AbstractCollection`
  Throws:
    `UnsupportedOperationException`

### remove

    public boolean remove(Object o)

  Always throws `UnsupportedOperationException` for an empty range.

  Specified by:
    `remove` in interface `Collection`
  Specified by:
    `remove` in interface `List`
  Overrides:
    `remove` in class `AbstractCollection`
  Throws:
    `UnsupportedOperationException`

### remove

    public Object remove(int index)

  Always throws `UnsupportedOperationException` for an empty range.

  Specified by:
    `remove` in interface `List`
  Overrides:
    `remove` in class `AbstractList`
  Throws:
    `UnsupportedOperationException`

### removeAll

    public boolean removeAll(Collection c)

  Always throws `UnsupportedOperationException` for an empty range.

  Specified by:
    `removeAll` in interface `Collection`
  Specified by:
    `removeAll` in interface `List`
  Overrides:
    `removeAll` in class `AbstractCollection`
  Throws:
    `UnsupportedOperationException`

### retainAll

    public boolean retainAll(Collection c)

  Always throws `UnsupportedOperationException` for an empty range.

  Specified by:
    `retainAll` in interface `Collection`
  Specified by:
    `retainAll` in interface `List`
  Overrides:
    `retainAll` in class `AbstractCollection`
  Throws:
    `UnsupportedOperationException`

### set

    public Object set(int index,
                      Object element)

  Always throws `UnsupportedOperationException` for an empty range.

  Specified by:
    `set` in interface `List`
  Overrides:
    `set` in class `AbstractList`
  Throws:
    `UnsupportedOperationException`

### step

    public void step(int step,
                     Closure closure)

  Always does nothing for an empty range.

  Specified by:
    `step` in interface `Range`
  Parameters:
    `step` - the amount by which to step. If negative, steps through the range backwards.
    `closure` - the `Closure` to call

### step

    public List step(int step)

  Always returns an empty list for an empty range.

  Specified by:
    `step` in interface `Range`
  Parameters:
    `step` - the amount by which to step. If negative, steps through the range backwards.
  Returns:
    the list formed by stepping through the range by the indicated interval.

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