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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/Format/XML/VersionedOGC.js
*/
/**
* Class: OpenLayers.Format.WMTSCapabilities
* Read WMTS Capabilities.
*
* Inherits from:
* - <OpenLayers.Format.XML.VersionedOGC>
*/
OpenLayers.Format.WMTSCapabilities = OpenLayers.Class(OpenLayers.Format.XML.VersionedOGC, {
/**
* APIProperty: defaultVersion
* {String} Version number to assume if none found. Default is "1.0.0".
*/
defaultVersion: "1.0.0",
/**
* APIProperty: yx
* {Object} Members in the yx object are used to determine if a CRS URN
* corresponds to a CRS with y,x axis order. Member names are CRS URNs
* and values are boolean. By default, the following CRS URN are
* assumed to correspond to a CRS with y,x axis order:
*
* * urn:ogc:def:crs:EPSG::4326
*/
yx: {
"urn:ogc:def:crs:EPSG::4326": true
},
/**
* Constructor: OpenLayers.Format.WMTSCapabilities
* Create a new parser for WMTS capabilities.
*
* Parameters:
* options - {Object} An optional object whose properties will be set on
* this instance.
*/
/**
* APIMethod: read
* Read capabilities data from a string, and return information about
* the service (offering and observedProperty mostly).
*
* Parameters:
* data - {String} or {DOMElement} data to read/parse.
*
* Returns:
* {Object} Info about the WMTS Capabilities
*/
/**
* APIMethod: createLayer
* Create a WMTS layer given a capabilities object.
*
* Parameters:
* capabilities - {Object} The object returned from a <read> call to this
* format.
* config - {Object} Configuration properties for the layer. Defaults for
* the layer will apply if not provided.
*
* Required config properties:
* layer - {String} The layer identifier.
*
* Optional config properties:
* matrixSet - {String} The matrix set identifier, required if there is
* more than one matrix set in the layer capabilities.
* style - {String} The name of the style
* format - {String} Image format for the layer. Default is the first
* format returned in the GetCapabilities response.
* param - {Object} The dimensions values eg: {"Year": "2012"}
*
* Returns:
* {<OpenLayers.Layer.WMTS>} A properly configured WMTS layer. Throws an
* error if an incomplete config is provided. Returns undefined if no
* layer could be created with the provided config.
*/
createLayer: function(capabilities, config) {
var layer;
// confirm required properties are supplied in config
if (!('layer' in config)) {
throw new Error("Missing property 'layer' in configuration.");
}
var contents = capabilities.contents;
// find the layer definition with the given identifier
var layers = contents.layers;
var layerDef;
for (var i=0, ii=contents.layers.length; i<ii; ++i) {
if (contents.layers[i].identifier === config.layer) {
layerDef = contents.layers[i];
break;
}
}
if (!layerDef) {
throw new Error("Layer not found");
}
var format = config.format;
if (!format && layerDef.formats && layerDef.formats.length) {
format = layerDef.formats[0];
}
// find the matrixSet definition
var matrixSet;
if (config.matrixSet) {
matrixSet = contents.tileMatrixSets[config.matrixSet];
} else if (layerDef.tileMatrixSetLinks.length >= 1) {
matrixSet = contents.tileMatrixSets[
layerDef.tileMatrixSetLinks[0].tileMatrixSet];
}
if (!matrixSet) {
throw new Error("matrixSet not found");
}
// get the default style for the layer
var style;
for (var i=0, ii=layerDef.styles.length; i<ii; ++i) {
style = layerDef.styles[i];
if (style.isDefault) {
break;
}
}
var requestEncoding = config.requestEncoding;
if (!requestEncoding) {
requestEncoding = "KVP";
if (capabilities.operationsMetadata.GetTile.dcp.http) {
var http = capabilities.operationsMetadata.GetTile.dcp.http;
// Get first get method
if (http.get[0].constraints) {
var constraints = http.get[0].constraints;
var allowedValues = constraints.GetEncoding.allowedValues;
// The OGC documentation is not clear if we should use
// REST or RESTful, ArcGis use RESTful,
// and OpenLayers use REST.
if (!allowedValues.KVP &&
(allowedValues.REST || allowedValues.RESTful)) {
requestEncoding = "REST";
}
}
}
}
var dimensions = [];
var params = config.params || {};
// to don't overwrite the changes in the applyDefaults
delete config.params;
for (var id = 0, ld = layerDef.dimensions.length ; id < ld ; id++) {
var dimension = layerDef.dimensions[id];
dimensions.push(dimension.identifier);
if (!params.hasOwnProperty(dimension.identifier)) {
params[dimension.identifier] = dimension['default'];
}
}
var projection = config.projection || matrixSet.supportedCRS.replace(
/urn:ogc:def:crs:(\w+):(.*:)?(\w+)$/, "$1:$3");
var units = config.units ||
(projection === "EPSG:4326" ? "degrees" : "m");
var resolutions = [];
for (var mid in matrixSet.matrixIds) {
if (matrixSet.matrixIds.hasOwnProperty(mid)) {
resolutions.push(
matrixSet.matrixIds[mid].scaleDenominator * 0.28E-3 /
OpenLayers.METERS_PER_INCH /
OpenLayers.INCHES_PER_UNIT[units]);
}
}
var url;
if (requestEncoding === "REST" && layerDef.resourceUrls) {
url = [];
var resourceUrls = layerDef.resourceUrls,
resourceUrl;
for (var t = 0, tt = layerDef.resourceUrls.length; t < tt; ++t) {
resourceUrl = layerDef.resourceUrls[t];
if (resourceUrl.format === format && resourceUrl.resourceType === "tile") {
url.push(resourceUrl.template);
}
}
}
else {
var httpGet = capabilities.operationsMetadata.GetTile.dcp.http.get;
url = [];
var constraint;
for (var i = 0, ii = httpGet.length; i < ii; i++) {
constraint = httpGet[i].constraints;
if (!constraint || (constraint && constraint.
GetEncoding.allowedValues[requestEncoding])) {
url.push(httpGet[i].url);
}
}
}
return new OpenLayers.Layer.WMTS(
OpenLayers.Util.applyDefaults(config, {
url: url,
requestEncoding: requestEncoding,
name: layerDef.title,
style: style.identifier,
format: format,
matrixIds: matrixSet.matrixIds,
matrixSet: matrixSet.identifier,
projection: projection,
units: units,
resolutions: config.isBaseLayer === false ? undefined :
resolutions,
serverResolutions: resolutions,
tileFullExtent: matrixSet.bounds,
dimensions: dimensions,
params: params
})
);
},
CLASS_NAME: "OpenLayers.Format.WMTSCapabilities"
});