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| Viewing file: Select action/file-type: /* Copyright (c) 2006-2010 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/GML.js
*/
/**
* Though required in the full build, if the GML format is excluded, we set
* the namespace here.
*/
if(!OpenLayers.Format.GML) {
OpenLayers.Format.GML = {};
}
/**
* Class: OpenLayers.Format.GML.Base
* Superclass for GML parsers.
*
* Inherits from:
* - <OpenLayers.Format.XML>
*/
OpenLayers.Format.GML.Base = OpenLayers.Class(OpenLayers.Format.XML, {
/**
* Property: namespaces
* {Object} Mapping of namespace aliases to namespace URIs.
*/
namespaces: {
gml: "http://www.opengis.net/gml",
xlink: "http://www.w3.org/1999/xlink",
xsi: "http://www.w3.org/2001/XMLSchema-instance",
wfs: "http://www.opengis.net/wfs" // this is a convenience for reading wfs:FeatureCollection
},
/**
* Property: defaultPrefix
*/
defaultPrefix: "gml",
/**
* Property: schemaLocation
* {String} Schema location for a particular minor version.
*/
schemaLocation: null,
/**
* APIProperty: featureType
* {Array(String) or String} The local (without prefix) feature typeName(s).
*/
featureType: null,
/**
* APIProperty: featureNS
* {String} The feature namespace. Must be set in the options at
* construction.
*/
featureNS: null,
/**
* APIProperty: geometry
* {String} Name of geometry element. Defaults to "geometry".
*/
geometryName: "geometry",
/**
* APIProperty: extractAttributes
* {Boolean} Extract attributes from GML. Default is true.
*/
extractAttributes: true,
/**
* APIProperty: srsName
* {String} URI for spatial reference system. This is optional for
* single part geometries and mandatory for collections and multis.
* If set, the srsName attribute will be written for all geometries.
* Default is null.
*/
srsName: null,
/**
* APIProperty: xy
* {Boolean} Order of the GML coordinate true:(x,y) or false:(y,x)
* Changing is not recommended, a new Format should be instantiated.
*/
xy: true,
/**
* Property: geometryTypes
* {Object} Maps OpenLayers geometry class names to GML element names.
* Use <setGeometryTypes> before accessing this property.
*/
geometryTypes: null,
/**
* Property: singleFeatureType
* {Boolean} True if there is only 1 featureType, and not an array
* of featuretypes.
*/
singleFeatureType: null,
/**
* Property: regExes
* Compiled regular expressions for manipulating strings.
*/
regExes: {
trimSpace: (/^\s*|\s*$/g),
removeSpace: (/\s*/g),
splitSpace: (/\s+/),
trimComma: (/\s*,\s*/g)
},
/**
* Constructor: OpenLayers.Format.GML.Base
* Instances of this class are not created directly. Use the
* <OpenLayers.Format.GML.v2> or <OpenLayers.Format.GML.v3> constructor
* instead.
*
* Parameters:
* options - {Object} An optional object whose properties will be set on
* this instance.
*
* Valid options properties:
* featureType - {Array(String) or String} Local (without prefix) feature
* typeName(s) (required).
* featureNS - {String} Feature namespace (required).
* geometryName - {String} Geometry element name.
*/
initialize: function(options) {
OpenLayers.Format.XML.prototype.initialize.apply(this, [options]);
this.setGeometryTypes();
if(options && options.featureNS) {
this.setNamespace("feature", options.featureNS);
}
this.singleFeatureType = !options || (typeof options.featureType === "string");
},
/**
* Method: read
*
* Parameters:
* data - {DOMElement} A gml:featureMember element, a gml:featureMembers
* element, or an element containing either of the above at any level.
*
* Returns:
* {Array(<OpenLayers.Feature.Vector>)} An array of features.
*/
read: function(data) {
if(typeof data == "string") {
data = OpenLayers.Format.XML.prototype.read.apply(this, [data]);
}
if(data && data.nodeType == 9) {
data = data.documentElement;
}
var features = [];
this.readNode(data, {features: features});
if(features.length == 0) {
// look for gml:featureMember elements
var elements = this.getElementsByTagNameNS(
data, this.namespaces.gml, "featureMember"
);
if(elements.length) {
for(var i=0, len=elements.length; i<len; ++i) {
this.readNode(elements[i], {features: features});
}
} else {
// look for gml:featureMembers elements (this is v3, but does no harm here)
var elements = this.getElementsByTagNameNS(
data, this.namespaces.gml, "featureMembers"
);
if(elements.length) {
// there can be only one
this.readNode(elements[0], {features: features});
}
}
}
return features;
},
/**
* Property: readers
* Contains public functions, grouped by namespace prefix, that will
* be applied when a namespaced node is found matching the function
* name. The function will be applied in the scope of this parser
* with two arguments: the node being read and a context object passed
* from the parent.
*/
readers: {
"gml": {
"featureMember": function(node, obj) {
this.readChildNodes(node, obj);
},
"featureMembers": function(node, obj) {
this.readChildNodes(node, obj);
},
"name": function(node, obj) {
obj.name = this.getChildValue(node);
},
"boundedBy": function(node, obj) {
var container = {};
this.readChildNodes(node, container);
if(container.components && container.components.length > 0) {
obj.bounds = container.components[0];
}
},
"Point": function(node, container) {
var obj = {points: []};
this.readChildNodes(node, obj);
if(!container.components) {
container.components = [];
}
container.components.push(obj.points[0]);
},
"coordinates": function(node, obj) {
var str = this.getChildValue(node).replace(
this.regExes.trimSpace, ""
);
str = str.replace(this.regExes.trimComma, ",");
var pointList = str.split(this.regExes.splitSpace);
var coords;
var numPoints = pointList.length;
var points = new Array(numPoints);
for(var i=0; i<numPoints; ++i) {
coords = pointList[i].split(",");
if (this.xy) {
points[i] = new OpenLayers.Geometry.Point(
coords[0], coords[1], coords[2]
);
} else {
points[i] = new OpenLayers.Geometry.Point(
coords[1], coords[0], coords[2]
);
}
}
obj.points = points;
},
"coord": function(node, obj) {
var coord = {};
this.readChildNodes(node, coord);
if(!obj.points) {
obj.points = [];
}
obj.points.push(new OpenLayers.Geometry.Point(
coord.x, coord.y, coord.z
));
},
"X": function(node, coord) {
coord.x = this.getChildValue(node);
},
"Y": function(node, coord) {
coord.y = this.getChildValue(node);
},
"Z": function(node, coord) {
coord.z = this.getChildValue(node);
},
"MultiPoint": function(node, container) {
var obj = {components: []};
this.readChildNodes(node, obj);
container.components = [
new OpenLayers.Geometry.MultiPoint(obj.components)
];
},
"pointMember": function(node, obj) {
this.readChildNodes(node, obj);
},
"LineString": function(node, container) {
var obj = {};
this.readChildNodes(node, obj);
if(!container.components) {
container.components = [];
}
container.components.push(
new OpenLayers.Geometry.LineString(obj.points)
);
},
"MultiLineString": function(node, container) {
var obj = {components: []};
this.readChildNodes(node, obj);
container.components = [
new OpenLayers.Geometry.MultiLineString(obj.components)
];
},
"lineStringMember": function(node, obj) {
this.readChildNodes(node, obj);
},
"Polygon": function(node, container) {
var obj = {outer: null, inner: []};
this.readChildNodes(node, obj);
obj.inner.unshift(obj.outer);
if(!container.components) {
container.components = [];
}
container.components.push(
new OpenLayers.Geometry.Polygon(obj.inner)
);
},
"LinearRing": function(node, obj) {
var container = {};
this.readChildNodes(node, container);
obj.components = [new OpenLayers.Geometry.LinearRing(
container.points
)];
},
"MultiPolygon": function(node, container) {
var obj = {components: []};
this.readChildNodes(node, obj);
container.components = [
new OpenLayers.Geometry.MultiPolygon(obj.components)
];
},
"polygonMember": function(node, obj) {
this.readChildNodes(node, obj);
},
"GeometryCollection": function(node, container) {
var obj = {components: []};
this.readChildNodes(node, obj);
container.components = [
new OpenLayers.Geometry.Collection(obj.components)
];
},
"geometryMember": function(node, obj) {
this.readChildNodes(node, obj);
}
},
"feature": {
"*": function(node, obj) {
// The node can either be named like the featureType, or it
// can be a child of the feature:featureType. Children can be
// geometry or attributes.
var name;
var local = node.localName || node.nodeName.split(":").pop();
// Since an attribute can have the same name as the feature type
// we only want to read the node as a feature if the parent
// node can have feature nodes as children. In this case, the
// obj.features property is set.
if (obj.features) {
if (!this.singleFeatureType &&
(OpenLayers.Util.indexOf(this.featureType, local) !== -1)) {
name = "_typeName";
} else if(local === this.featureType) {
name = "_typeName";
}
} else {
// Assume attribute elements have one child node and that the child
// is a text node. Otherwise assume it is a geometry node.
if(node.childNodes.length == 0 ||
(node.childNodes.length == 1 && node.firstChild.nodeType == 3)) {
if(this.extractAttributes) {
name = "_attribute";
}
} else {
name = "_geometry";
}
}
if(name) {
this.readers.feature[name].apply(this, [node, obj]);
}
},
"_typeName": function(node, obj) {
var container = {components: [], attributes: {}};
this.readChildNodes(node, container);
// look for common gml namespaced elements
if(container.name) {
container.attributes.name = container.name;
}
var feature = new OpenLayers.Feature.Vector(
container.components[0], container.attributes
);
if (!this.singleFeatureType) {
feature.type = node.nodeName.split(":").pop();
feature.namespace = node.namespaceURI;
}
var fid = node.getAttribute("fid") ||
this.getAttributeNS(node, this.namespaces["gml"], "id");
if(fid) {
feature.fid = fid;
}
if(this.internalProjection && this.externalProjection &&
feature.geometry) {
feature.geometry.transform(
this.externalProjection, this.internalProjection
);
}
if(container.bounds) {
feature.bounds = container.bounds;
}
obj.features.push(feature);
},
"_geometry": function(node, obj) {
this.readChildNodes(node, obj);
},
"_attribute": function(node, obj) {
var local = node.localName || node.nodeName.split(":").pop();
var value = this.getChildValue(node);
obj.attributes[local] = value;
}
},
"wfs": {
"FeatureCollection": function(node, obj) {
this.readChildNodes(node, obj);
}
}
},
/**
* Method: write
*
* Parameters:
* features - {Array(<OpenLayers.Feature.Vector>) | OpenLayers.Feature.Vector}
* An array of features or a single feature.
*
* Returns:
* {String} Given an array of features, a doc with a gml:featureMembers
* element will be returned. Given a single feature, a doc with a
* gml:featureMember element will be returned.
*/
write: function(features) {
var name;
if(features instanceof Array) {
name = "featureMembers";
} else {
name = "featureMember";
}
var root = this.writeNode("gml:" + name, features);
this.setAttributeNS(
root, this.namespaces["xsi"],
"xsi:schemaLocation", this.schemaLocation
);
return OpenLayers.Format.XML.prototype.write.apply(this, [root]);
},
/**
* Property: writers
* As a compliment to the readers property, this structure contains public
* writing functions grouped by namespace alias and named like the
* node names they produce.
*/
writers: {
"gml": {
"featureMember": function(feature) {
var node = this.createElementNSPlus("gml:featureMember");
this.writeNode("feature:_typeName", feature, node);
return node;
},
"MultiPoint": function(geometry) {
var node = this.createElementNSPlus("gml:MultiPoint");
for(var i=0; i<geometry.components.length; ++i) {
this.writeNode("pointMember", geometry.components[i], node);
}
return node;
},
"pointMember": function(geometry) {
var node = this.createElementNSPlus("gml:pointMember");
this.writeNode("Point", geometry, node);
return node;
},
"MultiLineString": function(geometry) {
var node = this.createElementNSPlus("gml:MultiLineString");
for(var i=0; i<geometry.components.length; ++i) {
this.writeNode("lineStringMember", geometry.components[i], node);
}
return node;
},
"lineStringMember": function(geometry) {
var node = this.createElementNSPlus("gml:lineStringMember");
this.writeNode("LineString", geometry, node);
return node;
},
"MultiPolygon": function(geometry) {
var node = this.createElementNSPlus("gml:MultiPolygon");
for(var i=0; i<geometry.components.length; ++i) {
this.writeNode(
"polygonMember", geometry.components[i], node
);
}
return node;
},
"polygonMember": function(geometry) {
var node = this.createElementNSPlus("gml:polygonMember");
this.writeNode("Polygon", geometry, node);
return node;
},
"GeometryCollection": function(geometry) {
var node = this.createElementNSPlus("gml:GeometryCollection");
for(var i=0, len=geometry.components.length; i<len; ++i) {
this.writeNode("geometryMember", geometry.components[i], node);
}
return node;
},
"geometryMember": function(geometry) {
var node = this.createElementNSPlus("gml:geometryMember");
var child = this.writeNode("feature:_geometry", geometry);
node.appendChild(child.firstChild);
return node;
}
},
"feature": {
"_typeName": function(feature) {
var node = this.createElementNSPlus("feature:" + this.featureType, {
attributes: {fid: feature.fid}
});
if(feature.geometry) {
this.writeNode("feature:_geometry", feature.geometry, node);
}
for(var name in feature.attributes) {
var value = feature.attributes[name];
if(value != null) {
this.writeNode(
"feature:_attribute",
{name: name, value: value}, node
);
}
}
return node;
},
"_geometry": function(geometry) {
if(this.externalProjection && this.internalProjection) {
geometry = geometry.clone().transform(
this.internalProjection, this.externalProjection
);
}
var node = this.createElementNSPlus(
"feature:" + this.geometryName
);
var type = this.geometryTypes[geometry.CLASS_NAME];
var child = this.writeNode("gml:" + type, geometry, node);
if(this.srsName) {
child.setAttribute("srsName", this.srsName);
}
return node;
},
"_attribute": function(obj) {
return this.createElementNSPlus("feature:" + obj.name, {
value: obj.value
});
}
},
"wfs": {
"FeatureCollection": function(features) {
/**
* This is only here because GML2 only describes abstract
* feature collections. Typically, you would not be using
* the GML format to write wfs elements. This just provides
* some way to write out lists of features. GML3 defines the
* featureMembers element, so that is used by default instead.
*/
var node = this.createElementNSPlus("wfs:FeatureCollection");
for(var i=0, len=features.length; i<len; ++i) {
this.writeNode("gml:featureMember", features[i], node);
}
return node;
}
}
},
/**
* Function: setGeometryTypes
* Sets the <geometryTypes> mapping.
*/
setGeometryTypes: function() {
this.geometryTypes = {
"OpenLayers.Geometry.Point": "Point",
"OpenLayers.Geometry.MultiPoint": "MultiPoint",
"OpenLayers.Geometry.LineString": "LineString",
"OpenLayers.Geometry.MultiLineString": "MultiLineString",
"OpenLayers.Geometry.Polygon": "Polygon",
"OpenLayers.Geometry.MultiPolygon": "MultiPolygon",
"OpenLayers.Geometry.Collection": "GeometryCollection"
};
},
CLASS_NAME: "OpenLayers.Format.GML.Base"
});
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