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* VisualEditor DataTransferHandlerFactory class.
*
* @copyright See AUTHORS.txt
*/
/**
* Data transfer handler factory.
*
* @class
* @extends OO.Factory
* @constructor
*/
ve.ui.DataTransferHandlerFactory = function VeUiDataTransferHandlerFactory() {
// Parent constructor
ve.ui.DataTransferHandlerFactory.super.apply( this, arguments );
// Handlers which match all kinds and a specific type
this.handlerNamesByType = {};
// Handlers which match a specific kind and type
this.handlerNamesByKindAndType = {};
// Handlers which match a specific file extension as a fallback
this.handlerNamesByExtension = {};
};
/* Inheritance */
OO.inheritClass( ve.ui.DataTransferHandlerFactory, OO.Factory );
/* Methods */
/**
* Register a constructor with the factory.
*
* function MyClass() {};
* OO.initClass( MyClass );
* MyClass.static.name = 'hello';
* // Register class with the factory, available via the symbolic name "hello"
* factory.register( MyClass );
*
* See https://doc.wikimedia.org/oojs/master/OO.Factory.html
*
* @param {Function} constructor Constructor to use when creating object
* @param {string} [name] Symbolic name to use for #create().
* This parameter may be omitted in favour of letting the constructor decide
* its own name, through `constructor.static.name`.
* @throws {Error} If a parameter is invalid
*/
ve.ui.DataTransferHandlerFactory.prototype.register = function ( constructor ) {
// Parent method
ve.ui.DataTransferHandlerFactory.super.prototype.register.apply( this, arguments );
this.updateIndexes( constructor, true );
};
/**
* Unregister a constructor from the factory.
*
* See https://doc.wikimedia.org/oojs/master/OO.Factory.html
*
* @param {string|Function} constructor Constructor function or symbolic name to unregister
* @throws {Error} If a parameter is invalid
*/
ve.ui.DataTransferHandlerFactory.prototype.unregister = function ( constructor ) {
// Parent method
ve.ui.DataTransferHandlerFactory.super.prototype.unregister.apply( this, arguments );
this.updateIndexes( constructor, false );
};
/**
* Update indexes used for handler loopup
*
* @param {Function} constructor Handler's constructor to insert/remove
* @param {boolean} insert Insert the handler into the indexes, remove otherwise
*/
ve.ui.DataTransferHandlerFactory.prototype.updateIndexes = function ( constructor, insert ) {
function ensureArray( obj, prop ) {
if ( obj[ prop ] === undefined ) {
obj[ prop ] = [];
}
return obj[ prop ];
}
function ensureMap( obj, prop ) {
if ( obj[ prop ] === undefined ) {
obj[ prop ] = {};
}
return obj[ prop ];
}
function remove( arr, item ) {
var index;
Eif ( ( index = arr.indexOf( item ) ) !== -1 ) {
arr.splice( index, 1 );
}
}
var i, j, ilen, jlen,
kinds = constructor.static.kinds,
types = constructor.static.types,
extensions = constructor.static.extensions;
if ( !kinds ) {
for ( j = 0, jlen = types.length; j < jlen; j++ ) {
if ( insert ) {
ensureArray( this.handlerNamesByType, types[ j ] ).unshift( constructor.static.name );
} else E{
remove( this.handlerNamesByType[ types[ j ] ], constructor.static.name );
}
}
} else {
for ( i = 0, ilen = kinds.length; i < ilen; i++ ) {
for ( j = 0, jlen = types.length; j < jlen; j++ ) {
if ( insert ) {
ensureArray(
ensureMap( this.handlerNamesByKindAndType, kinds[ i ] ),
types[ j ]
).unshift( constructor.static.name );
} else {
remove( this.handlerNamesByKindAndType[ kinds[ i ] ][ types[ j ] ], constructor.static.name );
}
}
}
}
if ( constructor.prototype instanceof ve.ui.FileTransferHandler ) {
for ( i = 0, ilen = extensions.length; i < ilen; i++ ) {
if ( insert ) {
ensureArray( this.handlerNamesByExtension, extensions[ i ] ).unshift( constructor.static.name );
} else E{
remove( this.handlerNamesByExtension[ extensions[ i ] ], constructor.static.name );
}
}
}
};
/**
* Get a handler name for a specific data transfer item
*
* @param {ve.ui.DataTransferItem} item Data transfer item
* @param {boolean} isPaste Handler being used for paste
* @param {boolean} isPasteSpecial Handler being used for "paste special"
* @return {string|undefined} Handler name, or undefined if not found
*/
ve.ui.DataTransferHandlerFactory.prototype.getHandlerNameForItem = function ( item, isPaste, isPasteSpecial ) {
// Fetch a given nested property, returning a zero-length array if
// any component of the path is not present.
// This is similar to ve.getProp, except with a `hasOwnProperty`
// test to ensure we aren't fooled by __proto__ and friends.
function fetch( obj /* , args… */ ) {
for ( var j = 1; j < arguments.length; j++ ) {
if (
typeof arguments[ j ] !== 'string' ||
!Object.prototype.hasOwnProperty.call( obj, arguments[ j ] )
) {
return [];
}
obj = obj[ arguments[ j ] ];
}
return obj;
}
var names = [].concat(
// 1. Match by kind + type (e.g. 'file' + 'text/html')
fetch( this.handlerNamesByKindAndType, item.kind, item.type ),
// 2. Match by just type (e.g. 'image/jpeg')
fetch( this.handlerNamesByType, item.type ),
// 3. Match by file extension (e.g. 'csv')
fetch( this.handlerNamesByExtension, item.getExtension() )
);
for ( var i = 0; i < names.length; i++ ) {
var name = names[ i ];
var constructor = this.registry[ name ];
if ( isPasteSpecial && !constructor.static.handlesPasteSpecial ) {
continue;
}
if ( isPaste && !constructor.static.handlesPaste ) {
continue;
}
if ( constructor.static.matchFunction && !constructor.static.matchFunction( item ) ) {
continue;
}
return name;
}
// No matching handler
return;
};
/* Initialization */
ve.ui.dataTransferHandlerFactory = new ve.ui.DataTransferHandlerFactory();
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