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Viewing file:     SOSGetObservation.js (9.43 KB)      -rw-rw-rw-

/* 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
 * @requires OpenLayers/Format/GML/v3.js
 */

/**
 * Class: OpenLayers.Format.SOSGetObservation
 * Read and write SOS GetObersation (to get the actual values from a sensor) 
 *     version 1.0.0
 *
 * Inherits from:
 *  - <OpenLayers.Format.XML>
 */
OpenLayers.Format.SOSGetObservation = OpenLayers.Class(OpenLayers.Format.XML, {
    
    /**
     * Property: namespaces
     * {Object} Mapping of namespace aliases to namespace URIs.
     */
    namespaces: {
        ows: "http://www.opengis.net/ows",
        gml: "http://www.opengis.net/gml",
        sos: "http://www.opengis.net/sos/1.0",
        ogc: "http://www.opengis.net/ogc",
        om: "http://www.opengis.net/om/1.0",
        xlink: "http://www.w3.org/1999/xlink",
        xsi: "http://www.w3.org/2001/XMLSchema-instance"
    },

    /**
     * Property: regExes
     * Compiled regular expressions for manipulating strings.
     */
    regExes: {
        trimSpace: (/^\s*|\s*$/g),
        removeSpace: (/\s*/g),
        splitSpace: (/\s+/),
        trimComma: (/\s*,\s*/g)
    },

    /**
     * Constant: VERSION
     * {String} 1.0.0
     */
    VERSION: "1.0.0",

    /**
     * Property: schemaLocation
     * {String} Schema location
     */
    schemaLocation: "http://www.opengis.net/sos/1.0 http://schemas.opengis.net/sos/1.0.0/sosGetObservation.xsd",

    /**
     * Property: defaultPrefix
     */
    defaultPrefix: "sos",

    /**
     * Constructor: OpenLayers.Format.SOSGetObservation
     *
     * Parameters:
     * options - {Object} An optional object whose properties will be set on
     *     this instance.
     */
    initialize: function(options) {
        OpenLayers.Format.XML.prototype.initialize.apply(this, [options]);
    },

    /**
     * Method: read
     * 
     * Parameters: 
     * data - {String} or {DOMElement} data to read/parse.
     *
     * Returns:
     * {Object} An object containing the measurements
     */
    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 info = {measurements: []};
        this.readNode(data, info);
        return info;
    },

    /**
     * Method: write
     *
     * Parameters:
     * options - {Object} Optional object.
     *
     * Returns:
     * {String} An SOS GetObservation request XML string.
     */
    write: function(options) {
        var node = this.writeNode("sos:GetObservation", options);
        node.setAttribute("xmlns:om", this.namespaces.om);
        this.setAttributeNS(
            node, this.namespaces.xsi,
            "xsi:schemaLocation", this.schemaLocation
        );
        return OpenLayers.Format.XML.prototype.write.apply(this, [node]);
    }, 

    /**
     * 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: {
        "om": {
            "ObservationCollection": function(node, obj) {
                obj.id = this.getAttributeNS(node, this.namespaces.gml, "id");
                this.readChildNodes(node, obj);
            },
            "member": function(node, observationCollection) {
                this.readChildNodes(node, observationCollection);
            },
            "Measurement": function(node, observationCollection) {
                var measurement = {};
                observationCollection.measurements.push(measurement);
                this.readChildNodes(node, measurement);
            },
            "samplingTime": function(node, measurement) {
                var samplingTime = {};
                measurement.samplingTime = samplingTime;
                this.readChildNodes(node, samplingTime);
            },
            "observedProperty": function(node, measurement) {
                measurement.observedProperty = 
                    this.getAttributeNS(node, this.namespaces.xlink, "href");
                this.readChildNodes(node, measurement);
            },
            "procedure": function(node, measurement) {
                measurement.procedure = 
                    this.getAttributeNS(node, this.namespaces.xlink, "href");
                this.readChildNodes(node, measurement);
            },
            "result": function(node, measurement) {
                var result = {};
                measurement.result = result;
                if (this.getChildValue(node) !== '') {
                    result.value = this.getChildValue(node);
                    result.uom = node.getAttribute("uom");
                } else {
                    this.readChildNodes(node, result);
                }
            }
        },
        "gml": OpenLayers.Util.applyDefaults({
            "TimeInstant": function(node, samplingTime) {
               var timeInstant = {};
                samplingTime.timeInstant = timeInstant;
                this.readChildNodes(node, timeInstant);
            },
            "timePosition": function(node, timeInstant) {
                timeInstant.timePosition = this.getChildValue(node);
            }
        }, OpenLayers.Format.GML.v3.prototype.readers.gml)
    },

    /**
     * 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: {
        "sos": {
            "GetObservation": function(options) {
                var node = this.createElementNSPlus("GetObservation", {
                    attributes: {
                        version: this.VERSION,
                        service: 'SOS'
                    } 
                }); 
                this.writeNode("offering", options, node);
                this.writeNode("eventTime", options, node);
                this.writeNode("procedure", options, node);
                this.writeNode("observedProperty", options, node);
                this.writeNode("responseFormat", options, node);
                this.writeNode("resultModel", options, node);                                
                this.writeNode("responseMode", options, node);
                return node; 
            },
            "responseFormat": function(options) {
                return this.createElementNSPlus("responseFormat", 
                    {value: options.responseFormat});
            },
            "procedure": function(options) {
                return this.createElementNSPlus("procedure", 
                    {value: options.procedure});
            },
            "offering": function(options) {
                return this.createElementNSPlus("offering", {value: 
                    options.offering});
            },
            "observedProperty": function(options) {
                return this.createElementNSPlus("observedProperty", 
                    {value: options.observedProperty});
            },
            "eventTime": function(options) {
                var node = this.createElementNSPlus("eventTime");
                if (options.eventTime === 'latest') {
                    this.writeNode("ogc:TM_Equals", options, node);
                }
                return node;
            },
            "resultModel": function(options) {
                return this.createElementNSPlus("resultModel", {value: 
                    options.resultModel});
            },
            "responseMode": function(options) {
                return this.createElementNSPlus("responseMode", {value: 
                    options.responseMode});
            }
        },
        "ogc": {
            "TM_Equals": function(options) {
                var node = this.createElementNSPlus("ogc:TM_Equals");
                this.writeNode("ogc:PropertyName", {property: 
                    "urn:ogc:data:time:iso8601"}, node);
                if (options.eventTime === 'latest') {
                    this.writeNode("gml:TimeInstant", {value: 'latest'}, node);
                }
                return node;
            },
            "PropertyName": function(options) {
                return this.createElementNSPlus("ogc:PropertyName", 
                    {value: options.property});
            }
        },
        "gml": {
            "TimeInstant": function(options) {
                var node = this.createElementNSPlus("gml:TimeInstant");
                this.writeNode("gml:timePosition", options, node);
                return node;
            },
            "timePosition": function(options) {
                var node = this.createElementNSPlus("gml:timePosition", 
                    {value: options.value});
                return node;
            }
        }
    },
    
    CLASS_NAME: "OpenLayers.Format.SOSGetObservation" 

});