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gecko-dev/extensions/xforms/nsXFormsMDGEngine.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla XForms support.
*
* The Initial Developer of the Original Code is
* Novell, Inc.
* Portions created by the Initial Developer are Copyright (C) 2004
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Allan Beaufour <abeaufour@novell.com>
* David Landwehr <dlandwehr@novell.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef __NSXFORMSMDGENGINE__
#define __NSXFORMSMDGENGINE__
#include "nscore.h"
#include "nsClassHashtable.h"
#include "nsCOMPtr.h"
#include "nsVoidArray.h"
#include "nsIDOMNode.h"
#include "nsXFormsTypes.h"
#include "nsXFormsMDGSet.h"
#include "nsXFormsNodeState.h"
#include "nsIModelElementPrivate.h"
class nsIDOMXPathExpression;
/**
* Data structure for nodes in the graph.
*
* There is one node per type (calculate, readonly, etc) for each nsIDOMNode.
* All nsXFormsMDGNodes for same nsIDOMNode are linked together via 'next'.
*/
class nsXFormsMDGNode {
private:
/** Dirty flag */
PRBool mDirty;
/** Does this node have an XPath expression attached to it */
PRBool mHasExpr;
public:
/** Pointer to the nsIDOMNode */
nsCOMPtr<nsIDOMNode> mContextNode;
/** The XPath expression for this node */
nsCOMPtr<nsIDOMXPathExpression> mExpression;
/** List of nodes that depend on this node */
nsVoidArray mSuc;
/** Number of nodes that this node depends on */
unsigned int mCount;
/** The type */
ModelItemPropName mType;
/** (XPath) Context size for this node */
PRInt32 mContextSize;
/** (XPath) Position for this node */
PRInt32 mContextPosition;
/** Does expression use dynamic functions */
PRBool mDynFunc;
/**
* Pointer to next nsXFormsMDGNode with same nsIDOMNode, but different
* MIP type (mType)
*/
nsXFormsMDGNode* mNext;
/**
* Constructor.
*
* @param aNode The context node
* @param aType The type of node (calculate, readonly, etc.)
*/
nsXFormsMDGNode(nsIDOMNode *aNode,
const ModelItemPropName aType);
/** Destructor */
~nsXFormsMDGNode();
/**
* Sets the XPath expression for the node.
*
* @param aExpression The XPath expression
* @param aDynFunc Whether expression uses dynamic functions
* @param aContextPosition The context position for the expression
* @param aContextSize The context size for the expression
*/
void SetExpression(nsIDOMXPathExpression *aExpression,
PRBool aDynFunc,
PRInt32 aContextPosition,
PRInt32 aContextSize);
/** Does node have an expression? */
PRBool HasExpr() const;
/** Is node dirty? */
PRBool IsDirty() const;
/* Mark node clean */
void MarkClean();
/* Mark node dirty */
void MarkDirty();
};
/**
* The Multi Dependency Graph (MDG) Engine.
*
* This class handles all the necessary logic to create and maintain the MDG,
* and update the instance data accordingly.
*
* A bit about the graph:
* As specified in the spec., one node (nsXFormsMDGNode) is created in the graph for
* each of the attributes (readonly, calculate, etc.) for a nsIDOMNode. These graph
* nodes are owned by the mNodeToMDG hash table, which maps from a nsIDOMNode to
* the first node in a single-linked list (mNext) of nodes for the same nsIDOMNode.
*
* @todo Merge SetNodeValue() with nsXFormsUtils::SetNodeValue() (XXX)
*/
class nsXFormsMDGEngine
{
protected:
/** Maps from nsIDOMNode to nsXFormsMDGNode */
nsClassHashtable<nsISupportsHashKey, nsXFormsMDGNode> mNodeToMDG;
/** Maps from nsIDOMNode to nsXFormsNodeState */
nsClassHashtable<nsISupportsHashKey, nsXFormsNodeState> mNodeStates;
/** Default node state */
nsXFormsNodeState mDefaultState;
/** True when Rebuild() has been run, but not ClearDispatchFlags() */
PRBool mJustRebuilt;
/** True when last Calculate() was run when mJustRebuilt was true. */
PRBool mFirstCalculate;
/** The actual MDG */
nsVoidArray mGraph;
/** The model that created the MDG */
nsIModelElementPrivate *mModel;
/**
* Set of nodes that are marked as changed, and should be included in
* recalculation
*/
nsXFormsMDGSet mMarkedNodes;
/** Number of nodes in the graph */
PRInt32 mNodesInGraph;
/** Hidden copy constructor */
nsXFormsMDGEngine(nsXFormsMDGEngine&) {}
/**
* Used by Clear() and ~ to delete the linked nodes in mNodeToMDG, the hash table
* itself handles the main nodes.
*/
static PLDHashOperator PR_CALLBACK
DeleteLinkedNodes(nsISupports *aKey,
nsAutoPtr<nsXFormsMDGNode> &aNode,
void *aArg);
/**
* Used by Rebuild() to find the start nodes for mGraph, that is nodes
* where mCount == 0.
*/
static PLDHashOperator PR_CALLBACK
AddStartNodes(nsISupports *aKey,
nsXFormsMDGNode *aNode,
void *aDeque);
/**
* Used by AndFlags() to boolean AND _all_ flags with aMask.
*/
static PLDHashOperator PR_CALLBACK
AndFlag(nsISupports *aKey,
nsAutoPtr<nsXFormsNodeState> &aState,
void *aMask);
/**
* Get non-const (NC) node state for a node, create a new node state if
* necessary.
*
* @param aContextNode The node to get the state for
* @return The state (owned by nsXFormsMDGEngine)
*/
nsXFormsNodeState* GetNCNodeState(nsIDOMNode *aContextNode);
/**
* Inserts a new text child for aContextNode.
*
* @param aContextNode The node to create a child for
* @param aNodeValue The value of the new node
* @param aBeforeNode If non-null, insert new node before this node
*/
nsresult CreateNewChild(nsIDOMNode *aContextNode,
const nsAString &aNodeValue,
nsIDOMNode *aBeforeNode = nsnull);
/**
* Retrieve a node from the graph.
*
* @param aDomNode The DOM node to retrieve
* @param aType The type to retrieve (readonly, calculate, etc)
* @param aCreate Create the node and insert it into the graph
* if it does not exist?
* @return The node, nsnull if not found and aCreate != PR_TRUE
*
* @note aType == eModel_type means "any type", as we do not store type
* information in the MDG.
*/
nsXFormsMDGNode* GetNode(nsIDOMNode *aDomNode,
ModelItemPropName aType,
PRBool aCreate = PR_TRUE);
/**
* Boolean AND _all_ flags with a mask.
*
* @param aAndMask The mask
* @return Did operation succeed?
*/
PRBool AndFlags(PRUint16 aAndMask);
/**
* Evaluates the expression for the given node and returns the boolean result.
*
* @param aNode The node to evaluate
* @param aRes The result of the evaluation
*/
nsresult BooleanExpression(nsXFormsMDGNode *aNode,
PRBool &aRes);
/**
* Compute MIP value for node types with boolean result (all except calculate)
*
* @param aStateFlag The flag for the type of MIP
* @param aDispatchFlag The dispatch flag
* @param aNode The context node
* @param aDidChange Was the node changed?
*/
nsresult ComputeMIP(eFlag_t aStateFlag,
eFlag_t aDispatchFlag,
nsXFormsMDGNode *aNode,
PRBool &aDidChange);
/**
* Same as ComputeMIP(), but also handles any inheritance of attributes.
*
* @param aStateFlag The flag for the type of MIP
* @param aDispatchFlag The dispatch flag
* @param aInheritanceFlag The inheritance flag for the type of MIP
* @param aNode The context node
* @param aSet Set of the nodes influenced by operation
*/
nsresult ComputeMIPWithInheritance(eFlag_t aStateFlag,
eFlag_t aDispatchFlag,
eFlag_t aInheritanceFlag,
nsXFormsMDGNode *aNode,
nsXFormsMDGSet *aSet);
/**
* Attaches inheritance to all children of a given node
*
* @param aSet Set of the nodes influenced by operation
* @param aSrc The node
* @param aState The state of the flag
* @param aStateFlag The flag
*/
nsresult AttachInheritance(nsXFormsMDGSet *aSet,
nsIDOMNode *aSrc,
PRBool aState,
eFlag_t aStateFlag);
/**
* Invalidate the information, ie. mark all nodes as dirty.
*/
nsresult Invalidate();
/**
* Set the value of a node.
* @param aContextNode The node to set the value for
* @param aNodeValue The value
* @param aMarkNode Whether to mark node as changed
* @param aNodeChanged Was node changed?
* @param aIsCalculate Is it a @calculate setting the value?
*/
nsresult SetNodeValueInternal(nsIDOMNode *aContextNode,
const nsAString &aNodeValue,
PRBool aMarkNode = PR_TRUE,
PRBool aIsCalculate = PR_FALSE,
PRBool *aNodeChanged = nsnull);
public:
/**
* Constructor
*/
nsXFormsMDGEngine();
/*
* Destructor
*/
~nsXFormsMDGEngine();
/**
* Initializes the internal structures. Needs to be called before class is used!
*
* @param aModel The model that created this MDGEngine instance.
*/
nsresult Init(nsIModelElementPrivate *aModel);
/**
* Insert new MIP (Model Item Property) into graph.
*
* @param aType The type of MIP
* @param aExpression The XPath expression
* @param aDependencies Set of nodes expression depends on
* @param aDynFunc True if expression uses dynamic functions
* @param aContextNode The context node for aExpression
* @param aContextPos The context positions of aExpression
* @param aContextSize The context size for aExpression
*/
nsresult AddMIP(ModelItemPropName aType,
nsIDOMXPathExpression *aExpression,
nsXFormsMDGSet *aDependencies,
PRBool aDynFunc,
nsIDOMNode *aContextNode,
PRInt32 aContextPos,
PRInt32 aContextSize);
/**
* Recalculate the MDG.
*
* @param aChangedNodes Returns the nodes that was changed during recalculation.
*
* @note aChangedNodes are unique and sorted in pointer-order, ascending.
*/
nsresult Recalculate(nsXFormsMDGSet *aChangedNodes);
/**
* Rebuilds the MDG.
*/
nsresult Rebuild();
/**
* Clears all information in the MDG.
*/
nsresult Clear();
/**
* Clears all Dispatch flags.
*/
nsresult ClearDispatchFlags();
/**
* Mark a node as changed.
*
* @param aContextNode The node to be marked.
*/
nsresult MarkNodeAsChanged(nsIDOMNode *aContextNode);
/**
* Set the value of a node -- the public version of SetNodeValueInternal().
*
* @param aContextNode The node to set the value for
* @param aNodeValue The value
* @param aNodeChanged Was node changed?
*/
nsresult SetNodeValue(nsIDOMNode *aContextNode,
const nsAString &aNodeValue,
PRBool *aNodeChanged = nsnull);
/**
* Get the value of a node. (used by nsXFormsMDG)
* @param aContextNode The node to get the value for
* @param aNodeValue The value of the node
*/
nsresult GetNodeValue(nsIDOMNode *aContextNode,
nsAString &aNodeValue);
/**
* External interface of GetNCNodeState(), returns const pointer to the node
* state.
*
* @param aContextNode The node to get the state for
* @return The state (owned by nsXFormsMDGEngine)
*/
const nsXFormsNodeState* GetNodeState(nsIDOMNode *aContextNode);
#ifdef DEBUG_beaufour
/**
* Write MDG graph to a file in GraphViz dot format.
*
* @param aFile Filename to write to (nsnull = stdout)
*/
void PrintDot(const char* aFile = nsnull);
#endif
};
#endif
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