/*************************************************************************
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 *  $RCSfile: ContentAction.idl,v $
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 *  last change: $Author: kso $ $Date: 2001/02/12 15:53:18 $
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 *  Sun Microsystems Inc., October, 2000
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 *  Sun Industry Standards Source License Version 1.1
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#ifndef __com_sun_star_ucb_ContentAction_idl__
#define __com_sun_star_ucb_ContentAction_idl__


//=============================================================================

module com { module sun { module star { module ucb {

//=============================================================================
/** specifies actions which can be transported with content events.

	<p>
	The situations under which contents will send ContentEvents of the various
	action types are described below.  The description is broken into a list of
	useful definitions, a list of events that happen to contents, and a list of
	reactions taken by contents in response to those events.
	</p>

	<p>
	The definitions are as follows:
	</p>

	<table border =1>
	<tr><td>D1</td><td>A content C has an identifier id(C).</td></tr>
	<tr><td>D2</td><td>A content C is in one of two states, Alive or Deleted.
	                   </td></tr>
	<tr><td>D3</td><td>A folder content F has a set of children H(F) that is a
					   set of content identifiers. For example, an "open"
					   command will usualy return a	subset of the contents
					   denoted by H(F).</td></tr>
	</table>

	<p>
	The events that can happen to contents (and that are of interest in this
	context) are listed next.  Note that 'event' here does not mean an
	ContentEvent, but rather some event that occurs either because some	content
	processes a command, or because a content gets informed about a relevant
	change in the underlying system it represents.
	</p>

	<table border =1>
	<tr><td>E1</td><td>The identifier of a content C changes from id1(C) == A
		               to id2(C) == B, denoted as E1(C: A->B). For example,
					   this event may occur when content C processes a
					   "setPropertyValues" command changing its "Title" propery,
					   or when afolder that hierarchicaly contains C changes
					   its identity.</td></tr>
	<tr><td>E2</td><td>The state of a content C changes from Alive to Deleted,
		               denoted as E2(C). For example, this event may occur when
					   content C processes a "delete"	command, or when a content
					   representing an IMAP message gets informed	by the IMAP
					   server that the message has been deleted.</td></tr>
	<tr><td>E3</td><td>The set of children of a folder content F is enlarged by
					   some identifier A (that was not previously in that set,
					   i.e., !(A in H1(F)) && (A in H2(F))), denoted as E3(F, A).
					   For example, this event may occur when a new content
					   created at folder F processes its "insert" command, or
					   when a folder representing	an IMAP mailbox gets informed
					   by the IMAP server that a new message has arrived at that
					   mailbox.</td></tr>
	</table>

	<p>
	Finally, the list of reactions taken by contents in response to the above
	events gives a description of what kinds of ContentEvents are sent in which
	situations:
	</p>

	<table border =1>
	<tr><td>R1</td><td>E1(C: A->B) results in C sending an EXCHANGED
					   ContentEvent, which then results in the following: All
					   folders F that used to have A as a child, but will not
					   have B as a child, i.e., (A in H1(F)) && !(B in H2(F)),
					   send a REMOVED ContentEvent.</td></tr>
	<tr><td>R2</td><td>E2(C) results in C sending a DELETED ContentEvent,
					   which then results in the following:  All folders F that
					   used to have A as a child, but will not continue to have
					   A as a child, i.e., (A in H1(F)) && !(A in H2(F)), send
					   a REMOVED event.</td></tr>
	<tr><td>R3</td><td>E3(F, A) results in F sending an INSERTED event.</td></tr>
	</table>
*/
constants ContentAction
{
	//-------------------------------------------------------------------------
	/** A content was inserted into a folder content (i.e., while updating the
		folder).

		<p>This action must be notified at the listeners of the folder content.
	*/
	const long INSERTED = 0;

	//-------------------------------------------------------------------------
	/** A content was removed from a folder content, but not physically
		destroyed (i.e., due to rules just applied to the folder).

		<p>This action must be notified at the listeners of the folder content.
	*/
	const long REMOVED = 1;

	//-------------------------------------------------------------------------
	/** A content was physically destroyed.

	    <p>Events containing this action may be generated at any time. So a
		content event listener should be prepared to get notified the "death"
		of the related content!

		<p>This action must be notified at the listeners of the deleted
		content.
	*/
	const long DELETED = 2;

	//-------------------------------------------------------------------------
	/** This Action indicates that a content has changed its identity (i.e.
		after renaming a file system folder).

		<p>This action must be notified at the listeners of the exchanged
		content.
	*/
	const long EXCHANGED = 4;

	//-------------------------------------------------------------------------
	/** This is obsolete and should no longer be used.

		@deprecated
	*/
	const long SEARCH_MATCHED = 128;

};

//=============================================================================

}; }; }; };

#endif
