Overview | Package | Class | Tree | Index | Help

Oracle® Coherence Java API Reference
v3.5.3
E15583-01
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

## com.tangosol.util
Class NullImplementation.NullSet

    java.lang.Object
      java.util.AbstractCollection
          java.util.AbstractSet
              com.tangosol.util.NullImplementation.NullSet

All Implemented Interfaces:
  ExternalizableLite, PortableObject, java.io.Serializable, java.lang.Iterable, java.util.Collection, java.util.Set

Enclosing class:
  NullImplementation

    public static class NullImplementation.NullSet

extends java.util.AbstractSet
implements java.io.Serializable, ExternalizableLite, PortableObject

An immutable set which contains nothing.

Field Summary
`static java.util.Set` | `INSTANCE` Since the set contains no information, only one ever has to exist.

Constructor Summary
`NullImplementation.NullSet()` Default constructor (for ExternalizableLite and PortableObject).

Method Summary
`boolean` | `add(java.lang.Object o)` Ensures that this Collection contains the specified element.
`void` | `clear()` Removes all of the elements from this Collection.
`boolean` | `contains(java.lang.Object o)` Returns true if this Collection contains the specified element.
`boolean` | `equals(java.lang.Object o)`
`int` | `hashCode()`
`java.util.Iterator` | `iterator()` Returns an Iterator over the elements contained in this Collection.
`void` | `readExternal(java.io.DataInput in)` Restore the contents of this object by loading the object's state from the passed DataInput object.
`void` | `readExternal(PofReader in)` Restore the contents of a user type instance by reading its state using the specified PofReader object.
`boolean` | `remove(java.lang.Object o)` Removes a single instance of the specified element from this Collection, if it is present (optional operation).
`int` | `size()` Returns the number of elements in this Collection.
`java.lang.Object[]` | `toArray()` Returns an array containing all of the elements in this Set.
`void` | `writeExternal(java.io.DataOutput out)` Save the contents of this object by storing the object's state into the passed DataOutput object.
`void` | `writeExternal(PofWriter out)` Save the contents of a POF user type instance by writing its state using the specified PofWriter object.

Methods inherited from class java.util.AbstractSet
`removeAll`

Methods inherited from class java.util.AbstractCollection
`addAll, containsAll, isEmpty, retainAll, toArray, toString`

Methods inherited from interface java.util.Set
`addAll, containsAll, isEmpty, retainAll, toArray`

Field Detail

### INSTANCE

    public static final java.util.Set INSTANCE

  Since the set contains no information, only one ever has to exist.

Constructor Detail

### NullImplementation.NullSet

    public NullImplementation.NullSet()

  Default constructor (for ExternalizableLite and PortableObject).

Method Detail

### toArray

    public java.lang.Object[] toArray()

  Returns an array containing all of the elements in this Set. Obeys the general contract of Collection.toArray.

  Specified by:
    `toArray` in interface `java.util.Collection`
  Specified by:
    `toArray` in interface `java.util.Set`
  Overrides:
    `toArray` in class `java.util.AbstractCollection`
  Returns:
    an Object array containing all of the elements in this Set

### iterator

    public java.util.Iterator iterator()

  Returns an Iterator over the elements contained in this Collection.

  Specified by:
    `iterator` in interface `java.lang.Iterable`
  Specified by:
    `iterator` in interface `java.util.Collection`
  Specified by:
    `iterator` in interface `java.util.Set`
  Specified by:
    `iterator` in class `java.util.AbstractCollection`
  Returns:
    an Iterator over the elements contained in this Collection

### size

    public int size()

  Returns the number of elements in this Collection.

  Specified by:
    `size` in interface `java.util.Collection`
  Specified by:
    `size` in interface `java.util.Set`
  Specified by:
    `size` in class `java.util.AbstractCollection`
  Returns:
    the number of elements in this Collection

### contains

    public boolean contains(java.lang.Object o)

  Returns true if this Collection contains the specified element. More formally, returns true if and only if this Collection contains at least one element `e` such that `(o==null ? e==null : o.equals(e))`.

  Specified by:
    `contains` in interface `java.util.Collection`
  Specified by:
    `contains` in interface `java.util.Set`
  Overrides:
    `contains` in class `java.util.AbstractCollection`
  Parameters:
    `o` - the object to search for in the set
  Returns:
    true if this set contains the specified object

### add

    public boolean add(java.lang.Object o)

  Ensures that this Collection contains the specified element.

  Specified by:
    `add` in interface `java.util.Collection`
  Specified by:
    `add` in interface `java.util.Set`
  Overrides:
    `add` in class `java.util.AbstractCollection`
  Parameters:
    `o` - element whose presence in this Collection is to be ensured
  Returns:
    true if the Collection changed as a result of the call

### remove

    public boolean remove(java.lang.Object o)

  Removes a single instance of the specified element from this Collection, if it is present (optional operation). More formally, removes an element `e` such that `(o==null ? e==null : o.equals(e))`, if the Collection contains one or more such elements. Returns true if the Collection contained the specified element (or equivalently, if the Collection changed as a result of the call).

  Specified by:
    `remove` in interface `java.util.Collection`
  Specified by:
    `remove` in interface `java.util.Set`
  Overrides:
    `remove` in class `java.util.AbstractCollection`
  Parameters:
    `o` - element to be removed from this Collection, if present
  Returns:
    true if the Collection contained the specified element

### clear

    public void clear()

  Removes all of the elements from this Collection.

  Specified by:
    `clear` in interface `java.util.Collection`
  Specified by:
    `clear` in interface `java.util.Set`
  Overrides:
    `clear` in class `java.util.AbstractCollection`

### equals

    public boolean equals(java.lang.Object o)

  Specified by:
    `equals` in interface `java.util.Collection`
  Specified by:
    `equals` in interface `java.util.Set`
  Overrides:
    `equals` in class `java.util.AbstractSet`

### hashCode

    public int hashCode()

  Specified by:
    `hashCode` in interface `java.util.Collection`
  Specified by:
    `hashCode` in interface `java.util.Set`
  Overrides:
    `hashCode` in class `java.util.AbstractSet`

### readExternal

    public void readExternal(java.io.DataInput in)
                      throws java.io.IOException

  Restore the contents of this object by loading the object's state from the passed DataInput object.

  Specified by:
    `readExternal` in interface `ExternalizableLite`
  Parameters:
    `in` - the DataInput stream to read data from in order to restore the state of this object
  Throws:
    `java.io.IOException` - if an I/O exception occurs
    `java.io.NotActiveException` - if the object is not in its initial state, and therefore cannot be deserialized into

### writeExternal

    public void writeExternal(java.io.DataOutput out)
                       throws java.io.IOException

  Save the contents of this object by storing the object's state into the passed DataOutput object.

  Specified by:
    `writeExternal` in interface `ExternalizableLite`
  Parameters:
    `out` - the DataOutput stream to write the state of this object to
  Throws:
    `java.io.IOException` - if an I/O exception occurs

### readExternal

    public void readExternal(PofReader in)
                      throws java.io.IOException

  Restore the contents of a user type instance by reading its state using the specified PofReader object.

  Specified by:
    `readExternal` in interface `PortableObject`
  Parameters:
    `in` - the PofReader from which to read the object's state
  Throws:
    `java.io.IOException` - if an I/O error occurs

### writeExternal

    public void writeExternal(PofWriter out)
                       throws java.io.IOException

  Save the contents of a POF user type instance by writing its state using the specified PofWriter object.

  Specified by:
    `writeExternal` in interface `PortableObject`
  Parameters:
    `out` - the PofWriter to which to write the object's state
  Throws:
    `java.io.IOException` - if an I/O error occurs

Overview | Package | Class | Tree | Index | Help

Oracle® Coherence Java API Reference
v3.5.3
E15583-01
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

Copyright © 2000, 2010, Oracle. All rights reserved.