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/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the 2-clause BSD license.
* See license.txt in the OpenLayers distribution or repository for the
* full text of the license. */
/**
* @requires OpenLayers/BaseTypes/Class.js
* @requires OpenLayers/Util.js
*/
/**
* Class: OpenLayers.Format
* Base class for format reading/writing a variety of formats. Subclasses
* of OpenLayers.Format are expected to have read and write methods.
*/
OpenLayers.Format = OpenLayers.Class({
/**
* Property: options
* {Object} A reference to options passed to the constructor.
*/
options: null,
/**
* APIProperty: externalProjection
* {<OpenLayers.Projection>} When passed a externalProjection and
* internalProjection, the format will reproject the geometries it
* reads or writes. The externalProjection is the projection used by
* the content which is passed into read or which comes out of write.
* In order to reproject, a projection transformation function for the
* specified projections must be available. This support may be
* provided via proj4js or via a custom transformation function. See
* {<OpenLayers.Projection.addTransform>} for more information on
* custom transformations.
*/
externalProjection: null,
/**
* APIProperty: internalProjection
* {<OpenLayers.Projection>} When passed a externalProjection and
* internalProjection, the format will reproject the geometries it
* reads or writes. The internalProjection is the projection used by
* the geometries which are returned by read or which are passed into
* write. In order to reproject, a projection transformation function
* for the specified projections must be available. This support may be
* provided via proj4js or via a custom transformation function. See
* {<OpenLayers.Projection.addTransform>} for more information on
* custom transformations.
*/
internalProjection: null,
/**
* APIProperty: data
* {Object} When <keepData> is true, this is the parsed string sent to
* <read>.
*/
data: null,
/**
* APIProperty: keepData
* {Object} Maintain a reference (<data>) to the most recently read data.
* Default is false.
*/
keepData: false,
/**
* Constructor: OpenLayers.Format
* Instances of this class are not useful. See one of the subclasses.
*
* Parameters:
* options - {Object} An optional object with properties to set on the
* format
*
* Valid options:
* keepData - {Boolean} If true, upon <read>, the data property will be
* set to the parsed object (e.g. the json or xml object).
*
* Returns:
* An instance of OpenLayers.Format
*/
initialize: function(options) {
OpenLayers.Util.extend(this, options);
this.options = options;
},
/**
* APIMethod: destroy
* Clean up.
*/
destroy: function() {
},
/**
* Method: read
* Read data from a string, and return an object whose type depends on the
* subclass.
*
* Parameters:
* data - {string} Data to read/parse.
*
* Returns:
* Depends on the subclass
*/
read: function(data) {
throw new Error('Read not implemented.');
},
/**
* Method: write
* Accept an object, and return a string.
*
* Parameters:
* object - {Object} Object to be serialized
*
* Returns:
* {String} A string representation of the object.
*/
write: function(object) {
throw new Error('Write not implemented.');
},
CLASS_NAME: "OpenLayers.Format"
});