2001-05-16 18:32:04 -04:00
|
|
|
<html>
|
|
|
|
|
<head>
|
|
|
|
|
<title>Status File for Jakarta Commons "Collections" Package</title>
|
|
|
|
|
<head>
|
|
|
|
|
<body bgcolor="white">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<div align="center">
|
|
|
|
|
<h1>The Jakarta Commons <em>Collections</em> Package</h1>
|
2002-10-20 22:03:29 -04:00
|
|
|
$Id: STATUS.html,v 1.19 2002/10/21 02:03:29 bayard Exp $<br>
|
2001-05-16 18:32:04 -04:00
|
|
|
<a href="#Introduction">[Introduction]</a>
|
|
|
|
|
<a href="#Dependencies">[Dependencies]</a>
|
|
|
|
|
<a href="#Release Info">[Release Info]</a>
|
|
|
|
|
<a href="#Committers">[Committers]</a>
|
|
|
|
|
<a href="#Action Items">[Action Items]</a>
|
|
|
|
|
<br><br>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<a name="Introduction"></a>
|
|
|
|
|
<h3>1. INTRODUCTION</h3>
|
|
|
|
|
|
|
|
|
|
<p>The <em>Collections</em> package contains a set of Java classes that
|
|
|
|
|
extend or augment the Java Collections Framework.
|
|
|
|
|
The following classes are included:</p>
|
|
|
|
|
<ul>
|
|
|
|
|
<li><strong>ArrayStack</strong> - An implementation of the java.util.Stack API
|
|
|
|
|
that is based on an ArrayList instead of a Vector, so it is not synchronized to
|
|
|
|
|
protect against multi-threaded access.</li>
|
2002-02-26 16:34:03 -05:00
|
|
|
<li><strong>Bag</strong> - A Collection that keeps a count of its members of the same
|
|
|
|
|
type, using <code>hashCode</code> to check for equality. Suppose
|
|
|
|
|
you have a Bag that contains <code>{a, a, b, c}</code>. Calling
|
|
|
|
|
getCount on <code>a</code> would return 2, while calling
|
|
|
|
|
uniqueSet would return <code>{a, b, c}</code>. <i>Note: this is an
|
|
|
|
|
interface with several implementations.</i></li>
|
2002-08-19 20:50:07 -04:00
|
|
|
<li><strong>BagUtils</strong> - Provides utility methods and decorators
|
|
|
|
|
for Bag and SortedBag instances.</li>
|
2001-05-16 18:32:04 -04:00
|
|
|
<li><strong>BeanMap</strong> - An implementation of the java.util.Map API
|
|
|
|
|
that is based on a JavaBean using introspection. The property names are the
|
|
|
|
|
keys of the map and the property values are the values of the map.</li>
|
2002-08-19 20:50:07 -04:00
|
|
|
<li><strong>BinaryHeap</strong> - Binary heap implementation
|
|
|
|
|
of PriorityQueue and Buffer.</li>
|
|
|
|
|
<li><strong>BoundedFifoBuffer</strong> - a very efficient implementation of
|
|
|
|
|
Buffer that does not alter the size of the buffer at runtime.</li>
|
|
|
|
|
<li><strong>Buffer</strong> - a collection that allows objects to be removed
|
|
|
|
|
in some well-defined order.</li>
|
|
|
|
|
<li><strong>BufferUtils</strong> - Contains static utility methods for
|
|
|
|
|
buffers.</li>
|
2001-05-16 18:32:04 -04:00
|
|
|
<li><strong>CollectionUtils</strong> - a variety of helper methods
|
|
|
|
|
for working with collections.</li>
|
2002-08-19 20:50:07 -04:00
|
|
|
<li><strong>ComparatorUtils</strong> - Contains static utility methods for
|
|
|
|
|
comparators.</li>
|
2001-05-16 18:32:04 -04:00
|
|
|
<li><strong>CursorableLinkedList</strong> - an implementation of the java.util.List
|
|
|
|
|
interface supporting a java.util.ListIterator that allows concurrent
|
|
|
|
|
modifications to the underlying list.</li>
|
2002-02-26 16:34:03 -05:00
|
|
|
<li><strong>DoubleOrderedMap</strong> - Red-Black tree-based implementation of Map.
|
|
|
|
|
This class guarantees
|
|
|
|
|
that the map will be in both ascending key order and ascending
|
|
|
|
|
value order, sorted according to the natural order for the key's
|
|
|
|
|
and value's classes.</li>
|
2001-05-16 18:32:04 -04:00
|
|
|
<li><strong>ExtendedProperties</strong> - extends normal Java properties by adding
|
|
|
|
|
the possibility to use the same key many times, concatenating the value strings
|
|
|
|
|
instead of overwriting them.</li>
|
|
|
|
|
<li><strong>FastArrayList</strong> - a custom implementation of java.util.ArrayList
|
|
|
|
|
designed to operate in a multithreaded environment where the large majority of
|
|
|
|
|
method calls are read-only, instead of structural changes.</li>
|
|
|
|
|
<li><strong>FastHashMap</strong> - a custom implementation of java.util.HashMap
|
|
|
|
|
designed to operate in a multithreaded environment where the large majority of
|
|
|
|
|
method calls are read-only, instead of structural changes.</li>
|
|
|
|
|
<li><strong>FastTreeMap</strong> - a custom implementation of java.util.TreeMap
|
|
|
|
|
designed to operate in a multithreaded environment where the large majority of
|
|
|
|
|
method calls are read-only, instead of structural changes.</li>
|
2002-02-26 16:34:03 -05:00
|
|
|
<li><strong>HashBag</strong> - An implementation of <strong>Bag</strong> that is backed by a
|
|
|
|
|
HashMap.</li>
|
2002-08-19 20:50:07 -04:00
|
|
|
<li><strong>IteratorUtils</strong> - Contains static utility methods for
|
|
|
|
|
iterators.</li>
|
2001-05-16 18:32:04 -04:00
|
|
|
<li><strong>ListUtils</strong> - miscelaneous utilities to manipulate Lists.</li>
|
2002-02-26 16:34:03 -05:00
|
|
|
<li><strong>MultiMap</strong> - This is simply a Map with slightly different semantics.
|
|
|
|
|
Instead of returning an Object, it returns a Collection.
|
|
|
|
|
So for example, you can put( key, new Integer(1) );
|
|
|
|
|
and then a Object get( key ); will return you a Collection
|
|
|
|
|
instead of an Integer. This is an interface implemented
|
|
|
|
|
by <strong>MultiHashMap</strong>.</li>
|
2001-05-16 18:32:04 -04:00
|
|
|
<li><strong>PriorityQueue</strong> - a PriorityQueue interface, with
|
|
|
|
|
<strong>BinaryHeap</strong> and <strong>SynchronizedPriorityQueue</strong>
|
|
|
|
|
implementations.</li>
|
2002-03-15 00:41:23 -05:00
|
|
|
<li><strong>ProxyMap</strong> - This <code>Map</code> wraps another <code>Map</code>
|
|
|
|
|
implementation, using the wrapped instance for its default
|
|
|
|
|
implementation. This class is used as a framework on which to
|
|
|
|
|
build to extensions for its wrapped <code>Map</code> object which
|
|
|
|
|
would be unavailable or inconvenient via sub-classing (but usable
|
|
|
|
|
via composition).</li>
|
2002-08-19 20:50:07 -04:00
|
|
|
<li><strong>ReferenceMap</strong> - Hashtable-based Map implementation that
|
|
|
|
|
allows mappings to be removed by the garbage collector.</li>
|
2002-02-26 16:34:03 -05:00
|
|
|
<li><strong>SequencedHashMap</strong> - A map of objects whose mapping entries are
|
|
|
|
|
sequenced based on the order in
|
|
|
|
|
which they were added.</li>
|
|
|
|
|
<li><strong>SortedBag</strong> - A type of <strong>Bag</strong> that maintains order among its unique
|
|
|
|
|
representative members</li>
|
2002-08-19 20:50:07 -04:00
|
|
|
<li><strong>StaticBucketMap</strong> - An efficient, thread-safe
|
|
|
|
|
implementation of java.util.Map that performs well in in a highly
|
|
|
|
|
thread-contentious environment.</li>
|
|
|
|
|
<li><strong>StringStack</strong> - A stack for string objects.</li>
|
|
|
|
|
<li><strong>SynchronizedPriorityQueue</strong> - A thread-safe version of
|
|
|
|
|
the priority queue.</li>
|
2002-02-26 16:34:03 -05:00
|
|
|
<li><strong>TreeBag</strong> - An implementation of <strong>Bag</strong> that is backed by a
|
|
|
|
|
TreeMap. Order will be maintained among the unique representative
|
|
|
|
|
members.</li>
|
2002-08-19 20:50:07 -04:00
|
|
|
<li><strong>UnboundedFifoBuffer</strong> - Efficient implementation of Buffer
|
|
|
|
|
that alters the size of the buffer at runtime.</li>
|
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
<p><b>comparators subpackage:</b></p>
|
|
|
|
|
|
|
|
|
|
<ul>
|
|
|
|
|
<li><strong>ComparableComparator</strong> - A Comparator that compares Comparable objects.
|
|
|
|
|
This Comparator is useful, for example,
|
|
|
|
|
for enforcing the natural order in custom implementations
|
|
|
|
|
of SortedSet and SortedMap.</li>
|
|
|
|
|
<li><strong>ComparatorChain</strong> - ComparatorChain is a Comparator that wraps one or
|
|
|
|
|
more Comparators in sequence. The ComparatorChain
|
|
|
|
|
calls each Comparator in sequence until either 1)
|
|
|
|
|
any single Comparator returns a non-zero result
|
|
|
|
|
(and that result is then returned),
|
|
|
|
|
or 2) the ComparatorChain is exhausted (and zero is
|
|
|
|
|
returned). This type of sorting is very similar
|
|
|
|
|
to multi-column sorting in SQL, and this class
|
|
|
|
|
allows Java classes to emulate that kind of behaviour
|
|
|
|
|
when sorting a List.</li>
|
|
|
|
|
<li><strong>NullComparator</strong> - A comparator that will compare nulls
|
|
|
|
|
to be either higher or lower than other objects.</li>
|
|
|
|
|
<li><strong>ReverseComparator</strong> - Reverses the order of another
|
|
|
|
|
comparator.</li>
|
|
|
|
|
<li><strong>TransformingComparator</strong> - Decorates another comparator
|
|
|
|
|
with transformation behavior.</li>
|
|
|
|
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
<p><b>iterators subpackage:</b></p>
|
|
|
|
|
|
|
|
|
|
<ul>
|
|
|
|
|
<li><strong>ArrayIterator</strong> - a java.util.Iterator wrapper for arrays.</li>
|
|
|
|
|
<li><strong>CollectinIterator</strong> - Provides an ordered iterator over
|
|
|
|
|
the elements contained in a collection of ordered iterators.</li>
|
|
|
|
|
<li><strong>EnumerationIterator</strong> - Adapter to make Enumeration
|
|
|
|
|
instances appear to be Iterator instances.</li>
|
|
|
|
|
<li><strong>FilterIterator</strong> - A Proxy <code>Iterator</code> which takes a
|
|
|
|
|
<code>Predicate</code>
|
|
|
|
|
instance to filter out objects from an underlying <code>Iterator</code> instance.
|
|
|
|
|
Only objects for which the
|
|
|
|
|
specified <code>Predicate</code> evaluates to <code>true</code> are
|
|
|
|
|
returned.</li>
|
|
|
|
|
<li><strong>FilterListIterator</strong> - A proxy <code>ListIterator</code> which
|
|
|
|
|
takes a <code>Predicate</code> instance to filter
|
|
|
|
|
out objects from an underlying <code>ListIterator</code>
|
|
|
|
|
instance. Only objects for which the specified
|
|
|
|
|
<code>Predicate</code> evaluates to <code>true</code> are
|
|
|
|
|
returned by the iterator.</li>
|
|
|
|
|
<li><strong>IteratorChain</strong> - An iterator that wraps one or more
|
|
|
|
|
iterators.</li>
|
|
|
|
|
<li><strong>IteratorEnumeration</strong> - Adapter to make Iterator instances
|
|
|
|
|
appear to be Enumeration instances.</li>
|
|
|
|
|
<li><strong>ListIteratorWrapper</strong> - As the wrapped Iterator is
|
|
|
|
|
traversed, ListIteratorWrapper builds a LinkedList of its values,
|
|
|
|
|
permitting all required operations of ListIterator.</li>
|
|
|
|
|
<li><strong>ProxyIterator</strong> - Delegates its methods to a proxy
|
|
|
|
|
instance.</li>
|
|
|
|
|
<li><strong>ProxyListIterator</strong> - Delegates its methods to a proxy
|
|
|
|
|
instance.</li>
|
|
|
|
|
<li><strong>SingletonIterator</strong> - An Iterator over a single
|
|
|
|
|
object instance.</li>
|
|
|
|
|
<li><strong>SingletonListIterator</strong> - A ListIterator over a single
|
|
|
|
|
object instance.</li>
|
|
|
|
|
<li><strong>TransformIterator</strong> - Uses a Transformer instance to
|
|
|
|
|
transform the contents of the Iterator into some other form.</li>
|
|
|
|
|
<li><strong>UniqueFilterIterator</strong> - A FilterIterator which only
|
|
|
|
|
returns "unique" Objects.</li>
|
2001-05-16 18:32:04 -04:00
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
<a name="Dependencies"></a>
|
|
|
|
|
<h3>2. DEPENDENCIES</h3>
|
|
|
|
|
|
|
|
|
|
<p>The <em>Collections</em> package is dependent upon the following external
|
|
|
|
|
components for development and use:</p>
|
|
|
|
|
<ul>
|
|
|
|
|
<li><a href="http://java.sun.com/j2se">Java Development Kit</a>
|
|
|
|
|
(Version 1.2 or later)</li>
|
|
|
|
|
<li><a href="http://www.junit.org">JUnit Testing Framework</a>
|
2001-07-14 19:43:11 -04:00
|
|
|
(Version 3.7 or later) - for unit tests only, not required
|
2001-05-16 18:32:04 -04:00
|
|
|
for deployment</li>
|
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<a name="Release Info"></a>
|
|
|
|
|
<h3>3. RELEASE INFO</h3>
|
|
|
|
|
|
2001-07-14 19:43:11 -04:00
|
|
|
<p>Current Release:
|
2002-10-20 22:03:29 -04:00
|
|
|
<a href="http://jakarta.apache.org/builds/jakarta-commons/release/commons-collections/v2.1">Version 2.1</a>
|
2001-05-16 18:32:04 -04:00
|
|
|
|
2002-10-20 22:03:29 -04:00
|
|
|
<p>Planned Next Release: ?</p>
|
2001-05-16 18:32:04 -04:00
|
|
|
|
|
|
|
|
<a name="Committers"></a>
|
|
|
|
|
<h3>4. COMMITTERS</h3>
|
|
|
|
|
|
|
|
|
|
<p>The following individuals are the primary developers and maintainers of this
|
|
|
|
|
component. Developers who plan to use <em>Collections</em> in their own
|
|
|
|
|
projects are encouraged to collaborate on the future development of this
|
|
|
|
|
component to ensure that it continues to meet a variety of needs.</p>
|
|
|
|
|
<ul>
|
2002-02-20 21:01:21 -05:00
|
|
|
<li><a href="mailto:mas@apache.org">Michael A. Smith</a></li>
|
2002-02-13 15:21:05 -05:00
|
|
|
<li><a href="mailto:morgand@apache.org">Morgan Delagrange</a></li>
|
2001-05-16 18:32:04 -04:00
|
|
|
<li><a href="mailto:donaldp@apache.org">Peter Donald</a></li>
|
|
|
|
|
<li><a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a></li>
|
|
|
|
|
<li><a href="mailto:craigmcc@apache.org">Craig McClanahan</a></li>
|
|
|
|
|
<li><a href="mailto:jstrachan@apache.org">James Strachan</a></li>
|
|
|
|
|
<li><a href="mailto:rwaldhoff@apache.org">Rodney Waldhoff</a></li>
|
|
|
|
|
<li><a href="mailto:jvanzyl@apache.org">Jason van Zyl</a></li>
|
2002-02-21 12:38:28 -05:00
|
|
|
<li><a href="mailto:bayard@apache.org">Henri Yandell</a></li>
|
2002-08-15 20:14:41 -04:00
|
|
|
<li><a href="mailto:pjack@apache.org">Paul Jack</a></li>
|
2002-08-17 07:39:50 -04:00
|
|
|
<li><a href="mailto:scolebourne@apache.org">Stephen Colebourne</a></li>
|
2001-05-16 18:32:04 -04:00
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
<a name="Action Items"></a>
|
|
|
|
|
<h3>5. ACTION ITEMS</h3>
|
|
|
|
|
|
|
|
|
|
<p>Want to help? Here's some "to do" items the team has identified.</p>
|
|
|
|
|
|
|
|
|
|
<table border="1">
|
|
|
|
|
<tr>
|
|
|
|
|
<th width="80%">Action Item</th>
|
|
|
|
|
<th width="20%">Volunteer</th>
|
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
|
|
<tr>
|
|
|
|
|
<td><strong>Additional Contributions</strong>. Other collection
|
2002-08-17 07:39:50 -04:00
|
|
|
or collection-related classes or decorators.</td>
|
2001-05-16 18:32:04 -04:00
|
|
|
<td align="center"> </td>
|
|
|
|
|
</tr>
|
2002-10-15 17:44:24 -04:00
|
|
|
|
|
|
|
|
<tr>
|
|
|
|
|
<td><strong>Primitive subpackage</strong>. Complete implementations of
|
|
|
|
|
a collections system based on primitives.</td>
|
|
|
|
|
<td align="center"> </td>
|
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
|
|
<tr>
|
|
|
|
|
<td><strong>MultiMap ideas</strong>. Updates to MultiMap, maybe based on
|
|
|
|
|
<a href="http://www.innig.org/util/innig-util/build/javadoc">this library</a>.</td>
|
|
|
|
|
<td align="center"> </td>
|
|
|
|
|
</tr>
|
2001-05-16 18:32:04 -04:00
|
|
|
|
|
|
|
|
<tr>
|
|
|
|
|
<td><strong>Additional Documentation</strong>. Create simple
|
|
|
|
|
User's Guide, examples, or other documentation for this package.</td>
|
|
|
|
|
<td align="center"> </td>
|
|
|
|
|
</tr>
|
2002-08-19 20:50:07 -04:00
|
|
|
|
|
|
|
|
<tr>
|
|
|
|
|
<td><strong>Serializable Collections</strong>. All of the concrete
|
|
|
|
|
Collection and Map implementations should be properly Serializable
|
|
|
|
|
across all versions of the JDK. Also, decorators should be
|
|
|
|
|
Serializable if the underlying instance is.</td>
|
|
|
|
|
<td align="center"> </td>
|
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
|
|
<tr>
|
|
|
|
|
<td><strong>Fail-Fast Iterators</strong>. All concrete Collection and
|
|
|
|
|
Map implementations that can have fail-fast iterators should have
|
|
|
|
|
them. Some classes, like StaticBucketMap, cannot possibly have
|
|
|
|
|
fail-fast iterators, but otherwise everything else should.</td>
|
|
|
|
|
<td align="center"> </td>
|
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
|
|
<tr>
|
|
|
|
|
<td><strong>Standard Constructors</strong>. All concrete Collection and
|
|
|
|
|
Map implementations should have the standard copy and no-argument
|
|
|
|
|
constructors.</td>
|
|
|
|
|
<td align="center"> </td>
|
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
|
|
<tr>
|
|
|
|
|
<td><strong>Additional Unit Tests</strong>. Create generic unit tests
|
|
|
|
|
for SortedSet and SortedMap.</td>
|
|
|
|
|
<td align="center"> </td>
|
|
|
|
|
</tr>
|
|
|
|
|
|
2001-05-16 18:32:04 -04:00
|
|
|
</table>
|
|
|
|
|
|
|
|
|
|
</body>
|
2001-07-14 19:43:11 -04:00
|
|
|
</html>
|
