Mercurial > projects > ldc
view tango/tango/util/collection/impl/MapCollection.d @ 132:1700239cab2e trunk
[svn r136] MAJOR UNSTABLE UPDATE!!!
Initial commit after moving to Tango instead of Phobos.
Lots of bugfixes...
This build is not suitable for most things.
author | lindquist |
---|---|
date | Fri, 11 Jan 2008 17:57:40 +0100 |
parents | |
children |
line wrap: on
line source
/******************************************************************************* File: MapCollection.d Originally written by Doug Lea and released into the public domain. Thanks for the assistance and support of Sun Microsystems Labs, Agorics Inc, Loral, and everyone contributing, testing, and using this code. History: Date Who What 13Oct95 dl Create 28jan97 dl make class public 14Dec06 kb adapted for Tango usage ********************************************************************************/ module tango.util.collection.impl.MapCollection; private import tango.core.Exception; private import tango.util.collection.impl.Collection; private import tango.util.collection.model.Map, tango.util.collection.model.View, tango.util.collection.model.MapView, tango.util.collection.model.Iterator, tango.util.collection.model.SortedKeys; /******************************************************************************* MapCollection extends Collection to provide default implementations of some Map operations. author: Doug Lea @version 0.93 <P> For an introduction to this package see <A HREF="index.html" > Overview </A>. ********************************************************************************/ public abstract class MapCollection(K, T) : Collection!(T), Map!(K, T) { alias MapView!(K, T) MapViewT; alias Collection!(T).remove remove; alias Collection!(T).removeAll removeAll; /*********************************************************************** Initialize at version 0, an empty count, and null screener ************************************************************************/ protected this () { super(); } /*********************************************************************** Initialize at version 0, an empty count, and supplied screener ************************************************************************/ protected this (Predicate screener) { super(screener); } /*********************************************************************** Implements tango.util.collection.Map.allowsKey. Default key-screen. Just checks for null. See_Also: tango.util.collection.Map.allowsKey ************************************************************************/ public final bool allowsKey(K key) { return (key !is K.init); } protected final bool isValidKey(K key) { static if (is (K : Object)) { if (key is null) return false; } return true; } /*********************************************************************** Principal method to throw a IllegalElementException for keys ************************************************************************/ protected final void checkKey(K key) { if (!isValidKey(key)) { throw new IllegalElementException("Attempt to include invalid key _in Collection"); } } /*********************************************************************** Implements tango.util.collection.impl.MapCollection.MapCollection.opIndexAssign Just calls add(key, element). See_Also: tango.util.collection.impl.MapCollection.MapCollection.add ************************************************************************/ public final void opIndexAssign (T element, K key) { add (key, element); } /*********************************************************************** Implements tango.util.collection.impl.Collection.Collection.matches Time complexity: O(n). Default implementation. Fairly sleazy approach. (Defensible only when you remember that it is just a default impl.) It tries to cast to one of the known collection interface types and then applies the corresponding comparison rules. This suffices for all currently supported collection types, but must be overridden if you define new Collection subinterfaces and/or implementations. See_Also: tango.util.collection.impl.Collection.Collection.matches ************************************************************************/ public override bool matches(View!(T) other) { if (other is null) {} else if (other is this) return true; else { auto tmp = cast (MapViewT) other; if (tmp) if (cast(SortedKeys!(K, T)) this) return sameOrderedPairs(this, tmp); else return samePairs(this, tmp); } return false; } public final static bool samePairs(MapViewT s, MapViewT t) { if (s.size !is t.size) return false; try { // set up to return false on collection exceptions foreach (key, value; t.keys) if (! s.containsPair (key, value)) return false; } catch (NoSuchElementException ex) { return false; } return true; } public final static bool sameOrderedPairs(MapViewT s, MapViewT t) { if (s.size !is t.size) return false; auto ss = s.keys(); try { // set up to return false on collection exceptions foreach (key, value; t.keys) { K sk; auto sv = ss.get (sk); if (sk != key || sv != value) return false; } } catch (NoSuchElementException ex) { return false; } return true; } // Object methods /*********************************************************************** Implements tango.util.collection.impl.Collection.Collection.removeAll See_Also: tango.util.collection.impl.Collection.Collection.removeAll Has to be here rather than in the superclass to satisfy D interface idioms ************************************************************************/ public void removeAll (Iterator!(T) e) { while (e.more) removeAll (e.get); } /*********************************************************************** Implements tango.util.collection.impl.Collection.Collection.removeElements See_Also: tango.util.collection.impl.Collection.Collection.removeElements Has to be here rather than in the superclass to satisfy D interface idioms ************************************************************************/ public void remove (Iterator!(T) e) { while (e.more) remove (e.get); } }