Imported existing code

indra/llcommon/lldepthstack.h

@@ -0,0 +1,105 @@
+/** 
+ * @file lldepthstack.h
+ * @brief Declaration of the LLDepthStack class
+ *
+ * $LicenseInfo:firstyear=2001&license=viewergpl$
+ * 
+ * Copyright (c) 2001-2009, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLDEPTHSTACK_H
+#define LL_LLDEPTHSTACK_H
+
+#include "linked_lists.h"
+
+template <class DATA_TYPE> class LLDepthStack
+{
+private:
+	LLLinkedList<DATA_TYPE> mStack;
+	U32						mCurrentDepth;
+	U32						mMaxDepth;
+
+public:
+	LLDepthStack() : mCurrentDepth(0), mMaxDepth(0) {}
+	~LLDepthStack()	{}
+
+	void setDepth(U32 depth)
+	{
+		mMaxDepth = depth;
+	}
+
+	U32 getDepth(void) const
+	{
+		return mCurrentDepth;
+	}
+
+	void push(DATA_TYPE *data)
+	{ 
+		if (mCurrentDepth < mMaxDepth)
+		{
+			mStack.addData(data); 
+			mCurrentDepth++;
+		}
+		else
+		{
+			// the last item falls off stack and is deleted
+			mStack.getLastData();
+			mStack.deleteCurrentData();	
+			mStack.addData(data);
+		}
+	}
+	
+	DATA_TYPE *pop()
+	{ 
+		DATA_TYPE *tempp = mStack.getFirstData(); 
+		if (tempp)
+		{
+			mStack.removeCurrentData(); 
+			mCurrentDepth--;
+		}
+		return tempp; 
+	}
+	
+	DATA_TYPE *check()
+	{ 
+		DATA_TYPE *tempp = mStack.getFirstData(); 
+		return tempp; 
+	}
+	
+	void deleteAllData()
+	{ 
+		mCurrentDepth = 0;
+		mStack.deleteAllData(); 
+	}
+	
+	void removeAllNodes()
+	{ 
+		mCurrentDepth = 0;
+		mStack.removeAllNodes(); 
+	}
+};
+
+#endif