зеркало из https://github.com/mozilla/gecko-dev.git
106 строки
4.6 KiB
Java
106 строки
4.6 KiB
Java
/* -*- Mode: java; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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* the License for the specific language governing rights and limitations
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* under the License.
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*
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* The Original Code is the Grendel mail/news client.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* Corporation. Portions created by Netscape are Copyright (C) 1997
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* Netscape Communications Corporation. All Rights Reserved.
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*
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* Created: Mauro Botelho <mabotelh@email.com>, 20 Mar 1999.
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*/
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package grendel.storage.mdb;
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/*| nsIMdbCell: the text in a single column of a row. The base nsIMdbBlob
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**| class provides all the interface related to accessing cell text.
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**|
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**|| column: each cell in a row appears in a specific column, where this
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**| column is identified by the an integer mdb_scope value (generated by
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**| the StringToScopeToken() method in the containing nsIMdbPort instance).
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**| Because a row cannot have more than one cell with the same column,
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**| something must give if one calls SetColumn() with an existing column
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**| in the same row. When this happens, the other cell is replaced with
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**| this cell (and the old cell is closed if it has outstanding refs).
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**|
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**|| row: every cell instance is a part of some row, and every cell knows
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**| which row is the parent row. (Note this should be represented by a
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**| weak backpointer, so that outstanding cell references cannot keep a
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**| row open that should be closed. Otherwise we'd have ref graph cycles.)
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**|
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**|| text: a cell can either be text, or it can have a child row or table,
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**| but not both at once. If text is read from a cell with a child, the text
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**| content should be empty (for AliasYarn()) or a description of the type
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**| of child (perhaps "mdb:cell:child:row" or "mdb:cell:child:table").
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**|
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**|| child: a cell might reference another row or a table, rather than text.
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**| The interface for putting and getting children rows and tables was first
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**| defined in the nsIMdbTable interface, but then this was moved to this cell
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**| interface as more natural.
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|*/
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interface nsIMdbCell extends nsIMdbBlob { // text attribute in row with column scope
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// { ===== begin nsIMdbCell methods =====
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// { ----- begin attribute methods -----
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public void SetColumn(nsIMdbEnv ev, int inColumn);
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public int GetColumn(nsIMdbEnv ev);
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public int GetBlobFill(nsIMdbEnv ev);
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public mdbOid GetChildOid(nsIMdbEnv ev);
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public boolean IsRowChild(nsIMdbEnv ev);
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/*
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public mdb_err GetCellInfo( // all cell metainfo except actual content
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nsIMdbEnv* ev,
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mdb_column* outColumn, // the column in the containing row
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mdb_fill* outBlobFill, // the size of text content in bytes
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mdbOid* outChildOid, // oid of possible row or table child
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mdb_bool* outIsRowChild) = 0; // nonzero if child, and a row child
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*/
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// Checking all cell metainfo is a good way to avoid forcing a large cell
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// in to memory when you don't actually want to use the content.
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public nsIMdbRow GetRow(nsIMdbEnv ev); // parent row for this cell
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public nsIMdbPort GetPort(nsIMdbEnv ev); // port containing cell
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// } ----- end attribute methods -----
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// { ----- begin children methods -----
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public mdbOid HasAnyChild( // does cell have a child instead of text?
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nsIMdbEnv ev);
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// out id of row or table (or unbound if no child)
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// nonzero if child is a row (rather than a table)
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public boolean IsChildRow(nsIMdbEnv ev);
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public nsIMdbRow GetChildRow( // access table of specific attribute
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nsIMdbEnv ev); // context
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public nsIMdbTable GetChildTable( // access table of specific attribute
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nsIMdbEnv ev); // context
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public void SetChildRow( // access table of specific attribute
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nsIMdbEnv ev, // context
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nsIMdbRow ioRow); // inRow must be bound inside this same db port
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public void SetChildTable( // access table of specific attribute
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nsIMdbEnv ev, // context
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nsIMdbTable inTable); // table must be bound inside this same db port
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// acquire child table (or nil if no child)
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// } ----- end children methods -----
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// } ===== end nsIMdbCell methods =====
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};
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