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304 lines
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<title>Status File for Jakarta Commons "Collections" Package</title>
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<h1>The Jakarta Commons <em>Collections</em> Package</h1>
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$Id: STATUS.html,v 1.29 2003/12/11 00:56:47 amamment Exp $<br>
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<a href="#Introduction">[Introduction]</a>
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<a href="#Dependencies">[Dependencies]</a>
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<a href="#Release Info">[Release Info]</a>
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<a href="#Committers">[Committers]</a>
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<a href="#Action Items">[Action Items]</a>
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<br><br>
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</div>
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<a name="Introduction"></a>
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<h3>1. INTRODUCTION</h3>
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<p>The <em>Collections</em> package contains a set of Java classes that
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extend or augment the Java Collections Framework.
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The following classes are included:</p>
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<ul>
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<li><strong>ArrayStack</strong> - An implementation of the java.util.Stack API
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that is based on an ArrayList instead of a Vector, so it is not synchronized to
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protect against multi-threaded access.</li>
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<li><strong>Bag</strong> - A Collection that keeps a count of its members of the same
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type, using <code>hashCode</code> to check for equality. Suppose
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you have a Bag that contains <code>{a, a, b, c}</code>. Calling
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getCount on <code>a</code> would return 2, while calling
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uniqueSet would return <code>{a, b, c}</code>. <i>Note: this is an
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interface with several implementations.</i></li>
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<li><strong>BagUtils</strong> - Provides utility methods and decorators
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for Bag and SortedBag instances.</li>
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<li><strong>BeanMap</strong> - An implementation of the java.util.Map API
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that is based on a JavaBean using introspection. The property names are the
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keys of the map and the property values are the values of the map.</li>
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<li><strong>BinaryHeap</strong> - Binary heap implementation
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of PriorityQueue and Buffer.</li>
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<li><strong>BoundedCollection</strong> - an interface used by collections that can
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have a variable number of elements up to a fixed bound.</li>
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<li><strong>BoundedFifoBuffer</strong> - a very efficient implementation of
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Buffer that does not alter the size of the buffer at runtime.</li>
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<li><strong>Buffer</strong> - a collection that allows objects to be removed
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in some well-defined order.</li>
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<li><strong>BufferUtils</strong> - Contains static utility methods for
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buffers.</li>
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<li><strong>CircularFifoBuffer</strong> - a Buffer implementation that is fixed in
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size and overwrites its oldest entry when full.</li>
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<li><strong>CollectionUtils</strong> - a variety of helper methods
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for working with collections.</li>
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<li><strong>ComparatorUtils</strong> - Contains static utility methods for
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comparators.</li>
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<li><strong>CursorableLinkedList</strong> - an implementation of the java.util.List
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interface supporting a java.util.ListIterator that allows concurrent
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modifications to the underlying list.</li>
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<li><strong>DoubleOrderedMap</strong> - Red-Black tree-based implementation of Map.
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This class guarantees
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that the map will be in both ascending key order and ascending
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value order, sorted according to the natural order for the key's
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and value's classes.</li>
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<li><strong>ExtendedProperties</strong> - extends normal Java properties by adding
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the possibility to use the same key many times, concatenating the value strings
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instead of overwriting them.</li>
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<li><strong>FastArrayList</strong> - a custom implementation of java.util.ArrayList
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designed to operate in a multithreaded environment where the large majority of
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method calls are read-only, instead of structural changes.</li>
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<li><strong>FastHashMap</strong> - a custom implementation of java.util.HashMap
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designed to operate in a multithreaded environment where the large majority of
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method calls are read-only, instead of structural changes.</li>
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<li><strong>FastTreeMap</strong> - a custom implementation of java.util.TreeMap
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designed to operate in a multithreaded environment where the large majority of
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method calls are read-only, instead of structural changes.</li>
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<li><strong>HashBag</strong> - An implementation of <strong>Bag</strong> that is backed by a
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HashMap.</li>
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<li><strong>IteratorUtils</strong> - Contains static utility methods for
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iterators.</li>
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<li><strong>ListUtils</strong> - miscelaneous utilities to manipulate Lists.</li>
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<li><strong>LRUMap</strong> - a least recently used Map implementation.</li>
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<li><strong>MultiMap</strong> - This is simply a Map with slightly different semantics.
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Instead of returning an Object, it returns a Collection.
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So for example, you can put( key, new Integer(1) );
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and then a Object get( key ); will return you a Collection
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instead of an Integer. This is an interface implemented
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by <strong>MultiHashMap</strong>.</li>
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<li><strong>NodeCachingLinkedList</strong> - a LinkedList implementation that has better
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performance.</li>
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<li><strong>PriorityQueue</strong> - a PriorityQueue interface, with
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<strong>BinaryHeap</strong> as an implementation.</li>
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<li><strong>PriorityQueueUtils</strong> - miscelaneous utilities to manipulate PriorityQueues.</li>
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<li><strong>ReferenceMap</strong> - Hashtable-based Map implementation that
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allows mappings to be removed by the garbage collector.</li>
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<li><strong>SequencedHashMap</strong> - A map of objects whose mapping entries are
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sequenced based on the order in
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which they were added.</li>
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<li><strong>SortedBag</strong> - A type of <strong>Bag</strong> that maintains order among its unique
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representative members</li>
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<li><strong>StaticBucketMap</strong> - An efficient, thread-safe
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implementation of java.util.Map that performs well in in a highly
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thread-contentious environment.</li>
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<li><strong>TreeBag</strong> - An implementation of <strong>Bag</strong> that is backed by a
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TreeMap. Order will be maintained among the unique representative
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members.</li>
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<li><strong>UnboundedFifoBuffer</strong> - Efficient implementation of Buffer
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that alters the size of the buffer at runtime.</li>
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</ul>
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<p><b>comparators subpackage:</b></p>
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<ul>
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<li><strong>BooleanComparator</strong> - A Comparator that compares Boolean objects.</li>
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<li><strong>ComparableComparator</strong> - A Comparator that compares Comparable objects.
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This Comparator is useful, for example,
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for enforcing the natural order in custom implementations
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of SortedSet and SortedMap.</li>
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<li><strong>ComparatorChain</strong> - ComparatorChain is a Comparator that wraps one or
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more Comparators in sequence. The ComparatorChain
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calls each Comparator in sequence until either 1)
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any single Comparator returns a non-zero result
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(and that result is then returned),
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or 2) the ComparatorChain is exhausted (and zero is
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returned). This type of sorting is very similar
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to multi-column sorting in SQL, and this class
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allows Java classes to emulate that kind of behaviour
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when sorting a List.</li>
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<li><strong>FixedOrderComparator</strong> - A comparator that will compare in an order
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specified at construction time.</li>
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<li><strong>NullComparator</strong> - A comparator that will compare nulls
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to be either higher or lower than other objects.</li>
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<li><strong>ReverseComparator</strong> - Reverses the order of another
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comparator.</li>
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<li><strong>TransformingComparator</strong> - Decorates another comparator
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with transformation behavior.</li>
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</ul>
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<p><b>iterators subpackage:</b></p>
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<ul>
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<li><strong>ArrayIterator</strong> - an Iterator wrapper for arrays, including primitive arrays.</li>
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<li><strong>ArrayListIterator</strong> - a ListIterator wrapper for arrays, including primitive arrays.</li>
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<li><strong>CollectinIterator</strong> - Provides an ordered iterator over
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the elements contained in a collection of ordered iterators.</li>
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<li><strong>EnumerationIterator</strong> - Adapter to make Enumeration
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instances appear to be Iterator instances.</li>
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<li><strong>FilterIterator</strong> - A Proxy <code>Iterator</code> which takes a
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<code>Predicate</code>
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instance to filter out objects from an underlying <code>Iterator</code> instance.
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Only objects for which the
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specified <code>Predicate</code> evaluates to <code>true</code> are
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returned.</li>
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<li><strong>FilterListIterator</strong> - A proxy <code>ListIterator</code> which
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takes a <code>Predicate</code> instance to filter
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out objects from an underlying <code>ListIterator</code>
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instance. Only objects for which the specified
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<code>Predicate</code> evaluates to <code>true</code> are
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returned by the iterator.</li>
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<li><strong>IteratorChain</strong> - An iterator that wraps one or more
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iterators.</li>
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<li><strong>IteratorEnumeration</strong> - Adapter to make Iterator instances
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appear to be Enumeration instances.</li>
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<li><strong>ListIteratorWrapper</strong> - As the wrapped Iterator is
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traversed, ListIteratorWrapper builds a LinkedList of its values,
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permitting all required operations of ListIterator.</li>
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<li><strong>LoopingIterator</strong> - Loops continuously around a collection.</li>
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<li><strong>ObjectArrayIterator</strong> - an Iterator wrapper for Object arrays.</li>
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<li><strong>ObjectArrayListIterator</strong> - a ListIterator wrapper for Object arrays.</li>
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<li><strong>ProxyIterator</strong> - Delegates its methods to a proxy
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instance.</li>
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<li><strong>ProxyListIterator</strong> - Delegates its methods to a proxy
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instance.</li>
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<li><strong>SingletonIterator</strong> - An Iterator over a single
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object instance.</li>
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<li><strong>SingletonListIterator</strong> - A ListIterator over a single
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object instance.</li>
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<li><strong>TransformIterator</strong> - Uses a Transformer instance to
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transform the contents of the Iterator into some other form.</li>
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<li><strong>UniqueFilterIterator</strong> - A FilterIterator which only
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returns "unique" Objects.</li>
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</ul>
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<a name="Dependencies"></a>
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<h3>2. DEPENDENCIES</h3>
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<p>The <em>Collections</em> package is dependent upon the following external
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components for development and use:</p>
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<ul>
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<li><a href="http://java.sun.com/j2se">Java Development Kit</a>
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(Version 1.2 or later)</li>
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<li><a href="http://www.junit.org">JUnit Testing Framework</a>
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(Version 3.7 or later) - for unit tests only, not required
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for deployment</li>
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</ul>
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<a name="Release Info"></a>
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<h3>3. RELEASE INFO</h3>
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<p>Current Release:
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<a href="http://jakarta.apache.org/builds/jakarta-commons/release/commons-collections/v2.1">Version 2.1</a>
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<p>Planned Next Release: ?</p>
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<a name="Committers"></a>
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<h3>4. COMMITTERS</h3>
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<p>The following individuals are the primary developers and maintainers of this
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component. Developers who plan to use <em>Collections</em> in their own
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projects are encouraged to collaborate on the future development of this
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component to ensure that it continues to meet a variety of needs.</p>
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<ul>
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<li><a href="mailto:mas@apache.org">Michael A. Smith</a></li>
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<li><a href="mailto:morgand@apache.org">Morgan Delagrange</a></li>
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<li><a href="mailto:donaldp@apache.org">Peter Donald</a></li>
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<li><a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a></li>
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<li><a href="mailto:craigmcc@apache.org">Craig McClanahan</a></li>
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<li><a href="mailto:jstrachan@apache.org">James Strachan</a></li>
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<li><a href="mailto:rwaldhoff@apache.org">Rodney Waldhoff</a></li>
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<li><a href="mailto:jvanzyl@apache.org">Jason van Zyl</a></li>
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<li><a href="mailto:bayard@apache.org">Henri Yandell</a></li>
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<li><a href="mailto:pjack@apache.org">Paul Jack</a></li>
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<li><a href="mailto:scolebourne@apache.org">Stephen Colebourne</a></li>
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<li><a href="mailto:rdonkin@apache.org">Robert Burrell Donkin</a></li>
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<li><a href="mailto:psteitz@apache.org">Phil Steitz</a></li>
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<li><a href="mailto:matth@apache.org">Matthew Hawthorne</a></li>
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<li>Arun M. Thomas</li>
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</ul>
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<a name="Action Items"></a>
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<h3>5. ACTION ITEMS</h3>
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<p>Want to help? Here's some "to do" items the team has identified.</p>
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<table border="1">
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<tr>
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<th width="80%">Action Item</th>
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<th width="20%">Volunteer</th>
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</tr>
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<tr>
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<td><strong>Additional Contributions</strong>. Other collection
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or collection-related classes or decorators.</td>
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<td align="center"> </td>
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</tr>
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<tr>
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<td><strong>Primitive subpackage</strong>. Complete implementations of
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a collections system based on primitives.</td>
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<td align="center"> </td>
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</tr>
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<tr>
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<td><strong>MultiMap ideas</strong>. Updates to MultiMap, maybe based on
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<a href="http://www.innig.org/util/innig-util/build/javadoc">this library</a>.</td>
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<td align="center"> </td>
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</tr>
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<tr>
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<td><strong>Additional Documentation</strong>. Create simple
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User's Guide, examples, or other documentation for this package.</td>
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<td align="center"> </td>
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</tr>
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<tr>
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<td><strong>Serializable Collections</strong>. All of the concrete
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Collection and Map implementations should be properly Serializable
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across all versions of the JDK. Also, decorators should be
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Serializable if the underlying instance is.</td>
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<td align="center"> </td>
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</tr>
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<tr>
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<td><strong>Fail-Fast Iterators</strong>. All concrete Collection and
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Map implementations that can have fail-fast iterators should have
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them. Some classes, like StaticBucketMap, cannot possibly have
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fail-fast iterators, but otherwise everything else should.</td>
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<td align="center"> </td>
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</tr>
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<tr>
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<td><strong>LoopingListIterator</strong>. A ListIterator similar to LoopingIterator</td>
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</tr>
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<tr>
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<td><strong>Standard Constructors</strong>. All concrete Collection and
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Map implementations should have the standard copy and no-argument
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constructors.</td>
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<td align="center"> </td>
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</tr>
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<tr>
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<td><strong>Additional Unit Tests</strong>. Create generic unit tests
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for SortedSet and SortedMap.</td>
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<td align="center"> </td>
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</tr>
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</table>
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</body>
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</html>
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