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/* Copyright (c) 2006-2011 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the Clear BSD license.
* See http://svn.openlayers.org/trunk/openlayers/license.txt for the
* full text of the license. */
/**
* @requires OpenLayers/Format/XML.js
* @requires OpenLayers/Format/OGCExceptionReport.js
*/
/**
* Class: OpenLayers.Format.XML.VersionedOGC
* Base class for versioned formats, i.e. a format which supports multiple
* versions.
*
* Inherits from:
* - <OpenLayers.Format.XML>
*/
OpenLayers.Format.XML.VersionedOGC = OpenLayers.Class(OpenLayers.Format.XML, {
/**
* APIProperty: defaultVersion
* {String} Version number to assume if none found.
*/
defaultVersion: null,
/**
* APIProperty: version
* {String} Specify a version string if one is known.
*/
version: null,
/**
* APIProperty: profile
* {String} If provided, use a custom profile.
*/
profile: null,
/**
* APIProperty: errorProperty
* {String} Which property of the returned object to check for in order to
* determine whether or not parsing has failed. In the case that the
* errorProperty is undefined on the returned object, the document will be
* run through an OGCExceptionReport parser.
*/
errorProperty: null,
/**
* Property: name
* {String} The name of this parser, this is the part of the CLASS_NAME
* except for "OpenLayers.Format."
*/
name: null,
/**
* APIProperty: stringifyOutput
* {Boolean} If true, write will return a string otherwise a DOMElement.
* Default is false.
*/
stringifyOutput: false,
/**
* Property: parser
* {Object} Instance of the versioned parser. Cached for multiple read and
* write calls of the same version.
*/
parser: null,
/**
* Constructor: OpenLayers.Format.XML.VersionedOGC.
* Constructor.
*
* Parameters:
* options - {Object} Optional object whose properties will be set on
* the object.
*/
initialize: function(options) {
OpenLayers.Format.XML.prototype.initialize.apply(this, [options]);
var className = this.CLASS_NAME;
this.name = className.substring(className.lastIndexOf(".")+1);
},
/**
* Method: getVersion
* Returns the version to use. Subclasses can override this function
* if a different version detection is needed.
*
* Parameters:
* root - {DOMElement}
* options - {Object} Optional configuration object.
*
* Returns:
* {String} The version to use.
*/
getVersion: function(root, options) {
var version;
// read
if (root) {
version = this.version;
if(!version) {
version = root.getAttribute("version");
if(!version) {
version = this.defaultVersion;
}
}
} else { // write
version = (options && options.version) ||
this.version || this.defaultVersion;
}
return version;
},
/**
* Method: getParser
* Get an instance of the cached parser if available, otherwise create one.
*
* Parameters:
* version - {String}
*
* Returns:
* {<OpenLayers.Format>}
*/
getParser: function(version) {
version = version || this.defaultVersion;
var profile = this.profile ? "_" + this.profile : "";
if(!this.parser || this.parser.VERSION != version) {
var format = OpenLayers.Format[this.name][
"v" + version.replace(/\./g, "_") + profile
];
if(!format) {
throw "Can't find a " + this.name + " parser for version " +
version + profile;
}
this.parser = new format(this.options);
}
return this.parser;
},
/**
* APIMethod: write
* Write a document.
*
* Parameters:
* obj - {Object} An object representing the document.
* options - {Object} Optional configuration object.
*
* Returns:
* {String} The document as a string
*/
write: function(obj, options) {
var version = this.getVersion(null, options);
this.parser = this.getParser(version);
var root = this.parser.write(obj, options);
if (this.stringifyOutput === false) {
return root;
} else {
return OpenLayers.Format.XML.prototype.write.apply(this, [root]);
}
},
/**
* APIMethod: read
* Read a doc and return an object representing the document.
*
* Parameters:
* data - {String | DOMElement} Data to read.
* options - {Object} Options for the reader.
*
* Returns:
* {Object} An object representing the document.
*/
read: function(data, options) {
if(typeof data == "string") {
data = OpenLayers.Format.XML.prototype.read.apply(this, [data]);
}
var root = data.documentElement;
var version = this.getVersion(root);
this.parser = this.getParser(version);
var obj = this.parser.read(data, options);
if (this.errorProperty !== null && obj[this.errorProperty] === undefined) {
// an error must have happened, so parse it and report back
var format = new OpenLayers.Format.OGCExceptionReport();
obj.error = format.read(data);
}
obj.version = version;
return obj;
},
CLASS_NAME: "OpenLayers.Format.XML.VersionedOGC"
});
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