org.ozoneDB.collections
Class AbstractOzoneCollection

java.lang.Object
  extended byorg.ozoneDB.OzoneObject
      extended byorg.ozoneDB.collections.AbstractOzoneCollection
All Implemented Interfaces:
java.util.Collection, OzoneCollection, org.ozoneDB.OzoneCompatible, org.ozoneDB.OzoneCompatibleOrProxy, org.ozoneDB.OzoneRemote, java.io.Serializable
Direct Known Subclasses:
_BaseTreeMap_SubMap_values, _BaseTreeMap_values, AbstractOzoneSet, BaseListImpl

public abstract class AbstractOzoneCollection
extends org.ozoneDB.OzoneObject
implements OzoneCollection

A basic implementation of most of the methods in the Collection interface to make it easier to create a collection. To create an unmodifiable Collection, just subclass AbstractOzoneCollection and provide implementations of the iterator() and size() methods. The Iterator returned by iterator() need only provide implementations of hasNext() and next() (that is, it may throw an UnsupportedOperationException if remove() is called). To create a modifiable Collection, you must in addition provide an implementation of the add(Object) method and the Iterator returned by iterator() must provide an implementation of remove(). Other methods should be overridden if the backing data structure allows for a more efficient implementation. The precise implementation used by AbstractOzoneCollection is documented, so that subclasses can tell which methods could be implemented more efficiently.

The programmer should provide a no-argument constructor, and one that accepts another Collection, as recommended by the Collection interface. Unfortunately, there is no way to enforce this in Java.

Author:
Original author unknown, Bryce McKinlay, Eric Blake , Leo Mekenkamp (mind the anti-sp@m) (adaptation for ozone)
See Also:
AbstractCollection, Serialized Form

Constructor Summary
protected AbstractOzoneCollection()
           
 
Method Summary
 boolean add(java.lang.Object o)
          Add an object to the collection (optional operation).
 boolean addAll(java.util.Collection c)
          Add all the elements of a given collection to this collection (optional operation).
 void clear()
          Remove all elements from the collection (optional operation).
 boolean contains(java.lang.Object o)
          Test whether this collection contains a given object.
 boolean containsAll(java.util.Collection c)
          Tests whether this collection contains all the elements in a given collection.
 java.util.Collection getClientCollection()
          Returns a non-ozone Collection that contains the same entries as this persistent one; it is (by nature of the client-server enviromnent) always a 'deep' copy of this OzoneCollection.
 boolean isEmpty()
          Test whether this collection is empty.
abstract  java.util.Iterator iterator()
          Return an Iterator over this collection.
 boolean remove(java.lang.Object o)
          Remove a single instance of an object from this collection (optional operation).
 boolean removeAll(java.util.Collection c)
          Remove from this collection all its elements that are contained in a given collection (optional operation).
 boolean retainAll(java.util.Collection c)
          Remove from this collection all its elements that are not contained in a given collection (optional operation).
abstract  int size()
          Return the number of elements in this collection.
 java.lang.Object[] toArray()
          Return an array containing the elements of this collection.
 java.lang.Object[] toArray(java.lang.Object[] a)
          Copy the collection into a given array if it will fit, or into a dynamically created array of the same run-time type as the given array if not.
 java.lang.String toString()
          Creates a String representation of the Collection.
 
Methods inherited from class org.ozoneDB.OzoneObject
container, database, deleteRecursive, equals, getHandle, getObjectID, handle, hashCode, onActivate, onCreate, onDelete, onPassivate, requireWriteLocking, self, setContainer, toXML
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface org.ozoneDB.collections.OzoneCollection
_org_ozoneDB_internalIterator
 
Methods inherited from interface java.util.Collection
equals, hashCode
 
Methods inherited from interface org.ozoneDB.OzoneCompatibleOrProxy
getObjectID
 

Constructor Detail

AbstractOzoneCollection

protected AbstractOzoneCollection()
Method Detail

iterator

public abstract java.util.Iterator iterator()
Return an Iterator over this collection. The iterator must provide the hasNext and next methods and should in addition provide remove if the collection is modifiable.

Specified by:
iterator in interface java.util.Collection
Returns:
an iterator

size

public abstract int size()
Return the number of elements in this collection. If there are more than Integer.MAX_VALUE elements, return Integer.MAX_VALUE.

Specified by:
size in interface java.util.Collection
Returns:
the size

add

public boolean add(java.lang.Object o)
Add an object to the collection (optional operation). This implementation always throws an UnsupportedOperationException - it should be overridden if the collection is to be modifiable. If the collection does not accept duplicates, simply return false. Collections may specify limitations on what may be added.

Specified by:
add in interface OzoneCollection
Parameters:
o - the object to add
Returns:
true if the add operation caused the Collection to change
Throws:
java.lang.UnsupportedOperationException - if the add operation is not supported on this collection
java.lang.NullPointerException - if the collection does not support null
java.lang.ClassCastException - if the object is of the wrong type
java.lang.IllegalArgumentException - if some aspect of the object prevents it from being added

addAll

public boolean addAll(java.util.Collection c)
Add all the elements of a given collection to this collection (optional operation). This implementation obtains an Iterator over the given collection and iterates over it, adding each element with the add(Object) method (thus this method will fail with an UnsupportedOperationException if the add method does). The behavior is unspecified if the specified collection is modified during the iteration, including the special case of trying addAll(this) on a non-empty collection.

Specified by:
addAll in interface OzoneCollection
Parameters:
c - the collection to add the elements of to this collection
Returns:
true if the add operation caused the Collection to change
Throws:
java.lang.UnsupportedOperationException - if the add operation is not supported on this collection
java.lang.NullPointerException - if this collection does not support null, or if the specified collection is null
java.lang.ClassCastException - if an object in c is of the wrong type
java.lang.IllegalArgumentException - if some aspect of an object in c prevents it from being added
See Also:
add(Object)

clear

public void clear()
Remove all elements from the collection (optional operation). This implementation obtains an iterator over the collection and calls next and remove on it repeatedly (thus this method will fail with an UnsupportedOperationException if the Iterator's remove method does) until there are no more elements to remove. Many implementations will have a faster way of doing this.

Specified by:
clear in interface OzoneCollection
Throws:
java.lang.UnsupportedOperationException - if the Iterator returned by iterator does not provide an implementation of remove
See Also:
Iterator.remove()

contains

public boolean contains(java.lang.Object o)
Test whether this collection contains a given object. That is, if the collection has an element e such that (o == null ? e == null : o.equals(e)). This implementation obtains an iterator over the collection and iterates over it, testing each element for equality with the given object. If it is equal, true is returned. Otherwise false is returned when the end of the collection is reached.

Specified by:
contains in interface java.util.Collection
Parameters:
o - the object to remove from this collection
Returns:
true if this collection contains an object equal to o

containsAll

public boolean containsAll(java.util.Collection c)
Tests whether this collection contains all the elements in a given collection. This implementation iterates over the given collection, testing whether each element is contained in this collection. If any one is not, false is returned. Otherwise true is returned.

Specified by:
containsAll in interface java.util.Collection
Parameters:
c - the collection to test against
Returns:
true if this collection contains all the elements in the given collection
Throws:
java.lang.NullPointerException - if the given collection is null
See Also:
contains(Object)

isEmpty

public boolean isEmpty()
Test whether this collection is empty. This implementation returns size() == 0.

Specified by:
isEmpty in interface java.util.Collection
Returns:
true if this collection is empty.
See Also:
size()

remove

public boolean remove(java.lang.Object o)
Remove a single instance of an object from this collection (optional operation). That is, remove one element e such that (o == null ? e == null : o.equals(e)), if such an element exists. This implementation obtains an iterator over the collection and iterates over it, testing each element for equality with the given object. If it is equal, it is removed by the iterator's remove method (thus this method will fail with an UnsupportedOperationException if the Iterator's remove method does). After the first element has been removed, true is returned; if the end of the collection is reached, false is returned.

Specified by:
remove in interface OzoneCollection
Parameters:
o - the object to remove from this collection
Returns:
true if the remove operation caused the Collection to change, or equivalently if the collection did contain o.
Throws:
java.lang.UnsupportedOperationException - if this collection's Iterator does not support the remove method
See Also:
Iterator.remove()

removeAll

public boolean removeAll(java.util.Collection c)
Remove from this collection all its elements that are contained in a given collection (optional operation). This implementation iterates over this collection, and for each element tests if it is contained in the given collection. If so, it is removed by the Iterator's remove method (thus this method will fail with an UnsupportedOperationException if the Iterator's remove method does).

Specified by:
removeAll in interface OzoneCollection
Parameters:
c - the collection to remove the elements of
Returns:
true if the remove operation caused the Collection to change
Throws:
java.lang.UnsupportedOperationException - if this collection's Iterator does not support the remove method
See Also:
Iterator.remove()

retainAll

public boolean retainAll(java.util.Collection c)
Remove from this collection all its elements that are not contained in a given collection (optional operation). This implementation iterates over this collection, and for each element tests if it is contained in the given collection. If not, it is removed by the Iterator's remove method (thus this method will fail with an UnsupportedOperationException if the Iterator's remove method does).

Specified by:
retainAll in interface OzoneCollection
Parameters:
c - the collection to retain the elements of
Returns:
true if the remove operation caused the Collection to change
Throws:
java.lang.UnsupportedOperationException - if this collection's Iterator does not support the remove method
See Also:
Iterator.remove()

toArray

public java.lang.Object[] toArray()
Return an array containing the elements of this collection. This implementation creates an Object array of size size() and then iterates over the collection, setting each element of the array from the value returned by the iterator. The returned array is safe, and is not backed by the collection.

Specified by:
toArray in interface java.util.Collection
Returns:
an array containing the elements of this collection

toArray

public java.lang.Object[] toArray(java.lang.Object[] a)
Copy the collection into a given array if it will fit, or into a dynamically created array of the same run-time type as the given array if not. If there is space remaining in the array, the first element after the end of the collection is set to null (this is only useful if the collection is known to contain no null elements, however). This implementation first tests whether the given array is large enough to hold all the elements of the collection. If not, the reflection API is used to allocate a new array of the same run-time type. Next an iterator is obtained over the collection and the elements are placed in the array as they are returned by the iterator. Finally the first spare element, if any, of the array is set to null, and the created array is returned. The returned array is safe; it is not backed by the collection. Note that null may not mark the last element, if the collection allows null elements.

Specified by:
toArray in interface java.util.Collection
Parameters:
a - the array to copy into, or of the correct run-time type
Returns:
the array that was produced
Throws:
java.lang.NullPointerException - if the given array is null
java.lang.ArrayStoreException - if the type of the array precludes holding one of the elements of the Collection

toString

public java.lang.String toString()
Creates a String representation of the Collection. The string returned is of the form "[a, b, ...]" where a and b etc are the results of calling toString on the elements of the collection. This implementation obtains an Iterator over the Collection and adds each element to a StringBuffer as it is returned by the iterator.

Returns:
a String representation of the Collection

getClientCollection

public java.util.Collection getClientCollection()

Returns a non-ozone Collection that contains the same entries as this persistent one; it is (by nature of the client-server enviromnent) always a 'deep' copy of this OzoneCollection. I.e. the contents of this OzoneCollection instance are always copied to the client by use of serialization.

This means that if this instance holds non-ozone objects, these objects are send to the calling client by means of serialization. If this instance holds ozone objects, it actually holds proxies to these objects. These proxies are copied and send to the client, resulting in different proxies to the same ozone objects.

Note that all subclasses of OzoneCollection (or OzoneMap) have getClientXxx() member functions that returns a collection of type Xxx; these simply return a the same result value as getClientCollection(), without the need for a typecast.

Specified by:
getClientCollection in interface OzoneCollection


Copyright © 2004 The Ozone Database Project - www.ozone-db.org. All Rights Reserved.