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nsPropertyTable.h

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/**
 * nsPropertyTable allows a set of arbitrary key/value pairs to be stored
 * for any number of nodes, in a global hashtable rather than on the nodes
 * themselves.  Nodes can be any type of object; the hashtable keys are
 * nsIAtom pointers, and the values are void pointers.
 */

#ifndef nsPropertyTable_h_
#define nsPropertyTable_h_

#include "nscore.h"

class nsIAtom;

/**
 * Callback type for property destructors.  |aObject| is the object
 * the property is being removed for, |aPropertyName| is the property
 * being removed, |aPropertyValue| is the value of the property, and |aData|
 * is the opaque destructor data that was passed to SetProperty().
 **/
typedef void
(*NSPropertyDtorFunc)(void           *aObject,
                      nsIAtom        *aPropertyName,
                      void           *aPropertyValue,
                      void           *aData);

class nsPropertyTable
{
 public:
  /**
   * Get the value of the property |aPropertyName| for node |aObject|.
   * |aResult|, if supplied, is filled in with a return status code.
   **/
  void* GetProperty(const void *aObject,
                    nsIAtom    *aPropertyName,
                    nsresult   *aResult = nsnull)
  { return GetPropertyInternal(aObject, aPropertyName, PR_FALSE, aResult); }

  /**
   * Set the value of the property |aPropertyName| to |aPropertyValue|
   * for node |aObject|.  |aDtor| is a destructor for the property value
   * to be called if the property is removed.  It can be null if no
   * destructor is required.  |aDtorData| is an optional opaque context to
   * be passed to the property destructor.  Note that the destructor is
   * global for each property name regardless of node; it is an error
   * to set a given property with a different destructor than was used before
   * (this will return NS_ERROR_INVALID_ARG).
   **/
  NS_HIDDEN_(nsresult) SetProperty(const void         *aObject,
                                   nsIAtom            *aPropertyName,
                                   void               *aPropertyValue,
                                   NSPropertyDtorFunc  aDtor,
                                   void               *aDtorData);

  /**
   * Delete the property |aPropertyName| for object |aObject|.
   * The property's destructor function will be called.
   **/
  NS_HIDDEN_(nsresult) DeleteProperty(const void *aObject,
                                      nsIAtom    *aPropertyName);

  /**
   * Unset the property |aPropertyName| for object |aObject|, but do not
   * call the property's destructor function.  The property value is returned.
   **/
  void* UnsetProperty(const void *aObject,
                      nsIAtom    *aPropertyName,
                      nsresult   *aStatus = nsnull)
  { return GetPropertyInternal(aObject, aPropertyName, PR_TRUE, aStatus); }

  /**
   * Deletes all of the properties for object |aObject|, calling the
   * destructor function for each property.
   **/
  NS_HIDDEN_(void) DeleteAllPropertiesFor(const void *aObject);

  /**
   * Deletes all of the properties for all objects in the property
   * table, calling the destructor function for each property.
   */
  NS_HIDDEN_(void) DeleteAllProperties();
  
  ~nsPropertyTable() {
    DeleteAllProperties();
  }

  struct PropertyList;

 private:
  NS_HIDDEN_(void) DestroyPropertyList();
  NS_HIDDEN_(PropertyList*) GetPropertyListFor(nsIAtom *aPropertyName) const;
  NS_HIDDEN_(void*) GetPropertyInternal(const void *aObject,
                                        nsIAtom    *aPropertyName,
                                        PRBool      aRemove,
                                        nsresult   *aStatus);

  PropertyList *mPropertyList;
};
#endif

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