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Gameleap/code/mw4/Libraries/stuff/Chain.cpp

@@ -0,0 +1,387 @@
+//===========================================================================//
+// File:	m_chain.cc                                                            //
+// Project: MUNGA           Brick: Connection Engine                         //
+// Contents: Implementation details of chains and their iterators            //
+//---------------------------------------------------------------------------//
+//   Date    Who  Modification                                               //
+// --------  ---  ---------------------------------------------------------- //
+// 09/29/94  ECH  Initial coding.                                            //
+// 10/20/94  JMA  Fixed style stuff.  Merged with CHNITR.HPP, and added      //
+//                operator functions to iterator                             //
+// 10/23/94  ECH  Added greater deletion safety                              //
+// 10/28/94  JMA  Made compatible with SGI CC                                //
+// 11/03/94  ECH  Made compatible with BC4.0                                 //
+// 12/12/94  ECH  Changed release handling											  //
+//---------------------------------------------------------------------------//
+// Copyright (C) 1994-1995, Virtual World Entertainment, Inc.                //
+//                      PROPRIETARY AND CONFIDENTIAL                         //
+//===========================================================================//
+
+#include "StuffHeaders.hpp"
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ChainLink ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+MemoryBlock*
+	ChainLink::s_AllocatedMemory = NULL;
+
+//
+//#############################################################################
+//#############################################################################
+//
+void
+	ChainLink::InitializeClass(size_t block_count)
+{
+	Verify(!s_AllocatedMemory);
+	s_AllocatedMemory =
+		new MemoryBlock(
+			sizeof(ChainLink),
+			block_count,
+			block_count>>2,
+			"Stuff::ChainLink",
+			g_ConnectionEngineHeap
+		);
+}
+
+//
+//#############################################################################
+//#############################################################################
+//
+void
+	ChainLink::TerminateClass()
+{
+	delete s_AllocatedMemory;
+	s_AllocatedMemory = NULL;
+}
+
+//
+//#############################################################################
+// ~ChainLink
+//#############################################################################
+//
+ChainLink::~ChainLink()
+{
+	Check_Object(this);
+	Check_Object(m_chain);
+
+	//
+	//------------------------
+	// Unlink the forward link
+	//------------------------
+	//
+	if (m_nextChainLink)
+	{
+		Check_Object(m_nextChainLink);
+		m_nextChainLink->m_prevChainLink = m_prevChainLink;
+	}
+	else
+	{
+		Verify(m_chain->m_tail == this);
+		m_chain->m_tail = m_prevChainLink;
+	}
+
+	//
+	//-------------------------
+	// Unlink the backward link
+	//-------------------------
+	//
+	if (m_prevChainLink)
+	{
+		Check_Object(m_prevChainLink);
+		m_prevChainLink->m_nextChainLink = m_nextChainLink;
+	}
+	else
+	{
+		Verify(m_chain->m_head == this);
+		m_chain->m_head = m_nextChainLink;
+	}
+
+	//
+	//------------------------------------------
+	// Remove this link from any plug references
+	//------------------------------------------
+	//
+	m_nextChainLink = NULL;
+	m_prevChainLink = NULL;
+	ReleaseFromPlug();
+}
+
+//
+//#############################################################################
+// ChainLink
+//#############################################################################
+//
+ChainLink::ChainLink(
+	Chain *m_chain,
+	Plug *plug,
+	ChainLink *next_link,
+	ChainLink *prev_link
+):
+	m_chain(m_chain),
+	m_plug(plug)
+{
+	//
+	//-------------------------
+	// ChainLink into existing m_chain
+	//-------------------------
+	//
+	AddToPlug(plug);
+	m_nextChainLink = next_link;
+	m_prevChainLink = prev_link;
+	if (prev_link)
+	{
+		Check_Object(prev_link);
+		prev_link->m_nextChainLink = this;
+	}
+	if (next_link)
+	{
+		Check_Object(next_link);
+		next_link->m_prevChainLink = this;
+	}
+}
+
+//
+//#############################################################################
+// ReleaseFromPlug
+//#############################################################################
+//
+void
+	ChainLink::ReleaseFromPlug()
+{
+	Check_Object(this);
+
+	//
+	//-----------------------------------------------------
+	// Remove this link from the plugs current set of links
+	//-----------------------------------------------------
+	//
+	Check_Object(m_plug);
+	ChainLink *link = m_plug->m_chainLinkHead;
+	Check_Object(link);
+	if (link == this)
+	{
+		if (m_nextPlugLink != this)
+			m_plug->m_chainLinkHead = m_nextPlugLink;
+		else
+		{
+			m_nextPlugLink = m_plug->m_chainLinkHead = NULL;
+			return;
+		}
+	}
+	while (link->m_nextPlugLink != this)
+	{
+		Check_Object(this);
+		link = link->m_nextPlugLink;
+	}
+	link->m_nextPlugLink = m_nextPlugLink;
+	m_nextPlugLink = NULL;
+}
+
+//
+//#############################################################################
+// AddToPlug
+//#############################################################################
+//
+void
+	ChainLink::AddToPlug(Plug *plug)
+{
+	Check_Object(this);
+	Check_Object(plug);
+
+	if (!plug->m_chainLinkHead)
+		m_nextPlugLink = this;
+	else
+	{
+		Check_Object(plug->m_chainLinkHead);
+		m_nextPlugLink = plug->m_chainLinkHead->m_nextPlugLink;
+		plug->m_chainLinkHead->m_nextPlugLink = this;
+	}
+	plug->m_chainLinkHead = this;
+}
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Chain ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+//
+//#############################################################################
+// ~Chain
+//#############################################################################
+//
+Chain::~Chain()
+{
+	Check_Object(this);
+	ChainLink *link = m_head;
+	while (link)
+	{
+		Check_Object(link);
+		ChainLink *next = link->m_nextChainLink;
+		Check_Object(link);
+		delete link;
+		link = next;
+	}
+}
+
+//
+//#############################################################################
+// AddImplementation
+//#############################################################################
+//
+void
+	Chain::AddPlug(Plug *plug)
+{
+	Check_Object(this);
+
+	m_tail = new ChainLink(this, plug, NULL, m_tail);
+	if (!m_head)
+		m_head = m_tail;
+}
+
+//
+//###########################################################################
+// IsPlugMember
+//###########################################################################
+//
+void
+	Chain::DeletePlugs()
+{
+	ChainLink *link = m_head;
+	while (link)
+	{
+		Check_Object(link);
+		ChainLink *next = link->m_nextChainLink;
+		Check_Object(link);
+		Check_Object(link->GetPlug());
+		delete link->GetPlug();
+		link = next;
+	}
+}
+
+//
+//###########################################################################
+// GetNthImplementation
+//###########################################################################
+//
+void*
+	Chain::GetNthItem(unsigned index)
+{
+	Check_Object(this);
+
+	unsigned count = 0;
+	for (ChainLink *link = m_head; link != NULL; link = link->m_nextChainLink)
+	{
+		Check_Object(link);
+		if (count == index)
+			return link->m_plug;
+		count++;
+	}
+	return NULL;
+}
+
+//
+//###########################################################################
+// GetSize
+//###########################################################################
+//
+unsigned
+	Chain::GetSize()
+{
+	Check_Object(this);
+
+	unsigned count=0;
+	for (ChainLink *link = m_head; link != NULL; link = link->m_nextChainLink)
+	{
+		Check_Object(link);
+		count++;
+	}
+	return count;
+}
+
+//
+//#############################################################################
+// InsertChainLink
+//#############################################################################
+//
+ChainLink*
+	Chain::InsertChainLink(
+		Plug *plug,
+		ChainLink *current_link
+	)
+{
+	Check_Object(this);
+	Check_Object(plug);
+	Check_Object(current_link);
+
+	ChainLink *new_link =
+		new ChainLink(
+			this,
+			plug,
+			current_link,
+			current_link->m_prevChainLink
+		);
+	Register_Object(new_link);
+	if (!new_link->m_prevChainLink)
+	{
+		Verify(m_head == current_link);
+		m_head = new_link;
+	}
+	return new_link;
+}
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ChainIterator ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+//
+//###########################################################################
+// GetNthImplementation
+//###########################################################################
+//
+void*
+	ChainIterator::GetNthItem(unsigned index)
+{
+	Check_Object(this);
+	unsigned count = 0;
+	for (
+		ChainLink *link = m_chain->m_head;
+		link != NULL;
+		link = link->m_nextChainLink
+	)
+	{
+		Check_Object(link);
+		if (count == index)
+		{
+			m_currentLink = link;
+			return m_currentLink->m_plug;
+		}
+		count++;
+	}
+	return NULL;
+}
+
+//
+//###########################################################################
+// Remove
+//###########################################################################
+//
+void
+	ChainIterator::Remove()
+{
+	Check_Object(this);
+	ChainLink *oldLink = m_currentLink;
+
+	Check_Object(m_currentLink);
+	m_currentLink = m_currentLink->m_nextChainLink;
+
+	Check_Object(oldLink);
+	delete oldLink;
+}
+
+//
+//###########################################################################
+// InsertImplementation
+//###########################################################################
+//
+void
+	ChainIterator::InsertPlug(Plug *plug)
+{
+	Check_Object(this);
+	m_currentLink =
+		m_chain->InsertChainLink(plug, m_currentLink);
+	Check_Object(m_currentLink);
+}