Merge pull request #632 from ahocevar/wps-client
WPS Client. r=@bartvde,@tschaub
This commit is contained in:
@@ -394,7 +394,9 @@
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"OpenLayers/Symbolizer/Raster.js",
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"OpenLayers/Lang.js",
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"OpenLayers/Lang/en.js",
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"OpenLayers/Spherical.js"
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"OpenLayers/Spherical.js",
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"OpenLayers/WPSClient.js",
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"OpenLayers/WPSProcess.js"
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]; // etc.
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}
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223
lib/OpenLayers/WPSClient.js
Normal file
223
lib/OpenLayers/WPSClient.js
Normal file
@@ -0,0 +1,223 @@
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/**
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||||
* Copyright (c) 2006-2012 by OpenLayers Contributors (see authors.txt for
|
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* full list of contributors). Published under the 2-clause BSD license.
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||||
* See license.txt in the OpenLayers distribution or repository for the
|
||||
* full text of the license.
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*
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* @requires OpenLayers/SingleFile.js
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*/
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/**
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* @requires OpenLayers/Events.js
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* @requires OpenLayers/WPSProcess.js
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* @requires OpenLayers/Format/WPSDescribeProcess.js
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* @requires OpenLayers/Request.js
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*/
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/**
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* Class: OpenLayers.WPSClient
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* High level API for interaction with Web Processing Services (WPS).
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* An <OpenLayers.WPSClient> instance is used to create <OpenLayers.WPSProcess>
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* instances for servers known to the WPSClient. The WPSClient also caches
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* DescribeProcess responses to reduce the number of requests sent to servers
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* when processes are created.
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*/
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OpenLayers.WPSClient = OpenLayers.Class({
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/**
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* Property: servers
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* {Object} Service metadata, keyed by a local identifier.
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*
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* Properties:
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* url - {String} the url of the server
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* version - {String} WPS version of the server
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* processDescription - {Object} Cache of raw DescribeProcess
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* responses, keyed by process identifier.
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*/
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servers: null,
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/**
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* Property: version
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* {String} The default WPS version to use if none is configured. Default
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* is '1.0.0'.
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*/
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version: '1.0.0',
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/**
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* Property: lazy
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* {Boolean} Should the DescribeProcess be deferred until a process is
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* fully configured? Default is false.
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*/
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lazy: false,
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/**
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* Property: events
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* {<OpenLayers.Events>}
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*
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* Supported event types:
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* describeprocess - Fires when the process description is available.
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* Listeners receive an object with a 'raw' property holding the raw
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* DescribeProcess response, and an 'identifier' property holding the
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* process identifier of the described process.
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*/
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events: null,
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/**
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* Constructor: OpenLayers.WPSClient
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*
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* Parameters:
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* options - {Object} Object whose properties will be set on the instance.
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*
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* Avaliable options:
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* servers - {Object} Mandatory. Service metadata, keyed by a local
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* identifier. Can either be a string with the service url or an
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* object literal with additional metadata:
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*
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* (code)
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* servers: {
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* local: '/geoserver/wps'
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* }, {
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* opengeo: {
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* url: 'http://demo.opengeo.org/geoserver/wps',
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* version: '1.0.0'
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* }
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* }
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* (end)
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*
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* lazy - {Boolean} Optional. Set to true if DescribeProcess should not be
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* requested until a process is fully configured. Default is false.
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*/
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initialize: function(options) {
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OpenLayers.Util.extend(this, options);
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this.events = new OpenLayers.Events(this);
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this.servers = {};
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for (var s in options.servers) {
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this.servers[s] = typeof options.servers[s] == 'string' ? {
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url: options.servers[s],
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version: this.version,
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processDescription: {}
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} : options.servers[s];
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}
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},
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/**
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* APIMethod: execute
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* Shortcut to execute a process with a single function call. This is
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* equivalent to using <getProcess> and then calling execute on the
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* process.
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*
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* Parameters:
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* options - {Object} Options for the execute operation.
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*
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* Available options:
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* server - {String} Mandatory. One of the local identifiers of the
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* configured servers.
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* process - {String} Mandatory. A process identifier known to the
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* server.
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* inputs - {Object} The inputs for the process, keyed by input identifier.
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* For spatial data inputs, the value of an input is usually an
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* <OpenLayers.Geometry>, an <OpenLayers.Feature.Vector> or an array of
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* geometries or features.
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* output - {String} The identifier of an output to parse. Optional. If not
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* provided, the first output will be parsed.
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* success - {Function} Callback to call when the process is complete.
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* This function is called with an outputs object as argument, which
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* will have a property with the identifier of the requested output
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* (e.g. 'result'). For processes that generate spatial output, the
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* value will either be a single <OpenLayers.Feature.Vector> or an
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* array of features.
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* scope - {Object} Optional scope for the success callback.
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*/
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execute: function(options) {
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var process = this.getProcess(options.server, options.process);
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process.execute({
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inputs: options.inputs,
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success: options.success,
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scope: options.scope
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});
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},
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/**
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* APIMethod: getProcess
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* Creates an <OpenLayers.WPSProcess>.
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*
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* Parameters:
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* serverID - {String} Local identifier from the servers that this instance
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* was constructed with.
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* processID - {String} Process identifier known to the server.
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*
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* Returns:
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* {<OpenLayers.WPSProcess>}
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*/
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getProcess: function(serverID, processID) {
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var process = new OpenLayers.WPSProcess({
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client: this,
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server: serverID,
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identifier: processID
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});
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if (!this.lazy) {
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process.describe();
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}
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return process;
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},
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/**
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* Method: describeProcess
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*
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* Parameters:
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* serverID - {String} Identifier of the server
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* processID - {String} Identifier of the requested process
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* callback - {Function} Callback to call when the description is available
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* scope - {Object} Optional execution scope for the callback function
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*/
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describeProcess: function(serverID, processID, callback, scope) {
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var server = this.servers[serverID];
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if (!server.processDescription[processID]) {
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if (!(processID in server.processDescription)) {
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// set to null so we know a describeFeature request is pending
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server.processDescription[processID] = null;
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OpenLayers.Request.GET({
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url: server.url,
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params: {
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SERVICE: 'WPS',
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VERSION: server.version,
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REQUEST: 'DescribeProcess',
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IDENTIFIER: processID
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},
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success: function(response) {
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server.processDescription[processID] = response.responseText;
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this.events.triggerEvent('describeprocess', {
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identifier: processID,
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raw: response.responseText
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});
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},
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scope: this
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});
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} else {
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// pending request
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this.events.register('describeprocess', this, function describe(evt) {
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if (evt.identifier === processID) {
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this.events.unregister('describeprocess', this, describe);
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callback.call(scope, evt.raw);
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}
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});
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}
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} else {
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window.setTimeout(function() {
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callback.call(scope, server.processDescription[processID]);
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}, 0);
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}
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},
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/**
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* Method: destroy
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*/
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destroy: function() {
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this.events.destroy();
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this.events = null;
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this.servers = null;
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},
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CLASS_NAME: 'OpenLayers.WPSClient'
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});
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501
lib/OpenLayers/WPSProcess.js
Normal file
501
lib/OpenLayers/WPSProcess.js
Normal file
@@ -0,0 +1,501 @@
|
||||
/**
|
||||
* Copyright (c) 2006-2012 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/SingleFile.js
|
||||
*/
|
||||
|
||||
/**
|
||||
* @requires OpenLayers/Geometry.js
|
||||
* @requires OpenLayers/Feature/Vector.js
|
||||
* @requires OpenLayers/Format/WKT.js
|
||||
* @requires OpenLayers/Format/GeoJSON.js
|
||||
* @requires OpenLayers/Format/WPSExecute.js
|
||||
* @requires OpenLayers/Request.js
|
||||
*/
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||||
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||||
/**
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||||
* Class: OpenLayers.WPSProcess
|
||||
* Representation of a WPS process. Usually instances of
|
||||
* <OpenLayers.WPSProcess> are created by calling 'getProcess' on an
|
||||
* <OpenLayers.WPSClient> instance.
|
||||
*
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||||
* Currently <OpenLayers.WPSProcess> supports processes that have geometries
|
||||
* or features as output, using WKT or GeoJSON as output format. It also
|
||||
* supports chaining of processes by using the <output> method to create a
|
||||
* handle that is used as process input instead of a static value.
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||||
*/
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||||
OpenLayers.WPSProcess = OpenLayers.Class({
|
||||
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||||
/**
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* Property: client
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||||
* {<OpenLayers.WPSClient>} The client that manages this process.
|
||||
*/
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||||
client: null,
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||||
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||||
/**
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* Property: server
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||||
* {String} Local client identifier for this process's server.
|
||||
*/
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||||
server: null,
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||||
|
||||
/**
|
||||
* Property: identifier
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||||
* {String} Process identifier known to the server.
|
||||
*/
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identifier: null,
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|
||||
/**
|
||||
* Property: description
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||||
* {Object} DescribeProcess response for this process.
|
||||
*/
|
||||
description: null,
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||||
|
||||
/**
|
||||
* APIProperty: localWPS
|
||||
* {String} Service endpoint for locally chained WPS processes. Default is
|
||||
* 'http://geoserver/wps'.
|
||||
*/
|
||||
localWPS: 'http://geoserver/wps',
|
||||
|
||||
/**
|
||||
* Property: formats
|
||||
* {Object} OpenLayers.Format instances keyed by mimetype.
|
||||
*/
|
||||
formats: null,
|
||||
|
||||
/**
|
||||
* Property: chained
|
||||
* {Integer} Number of chained processes for pending execute requests that
|
||||
* don't have a full configuration yet.
|
||||
*/
|
||||
chained: 0,
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||||
|
||||
/**
|
||||
* Property: executeCallbacks
|
||||
* {Array} Callbacks waiting to be executed until all chained processes
|
||||
* are configured;
|
||||
*/
|
||||
executeCallbacks: null,
|
||||
|
||||
/**
|
||||
* Constructor: OpenLayers.WPSProcess
|
||||
*
|
||||
* Parameters:
|
||||
* options - {Object} Object whose properties will be set on the instance.
|
||||
*
|
||||
* Avaliable options:
|
||||
* client - {<OpenLayers.WPSClient>} Mandatory. Client that manages this
|
||||
* process.
|
||||
* server - {String} Mandatory. Local client identifier of this process's
|
||||
* server.
|
||||
* identifier - {String} Mandatory. Process identifier known to the server.
|
||||
*/
|
||||
initialize: function(options) {
|
||||
OpenLayers.Util.extend(this, options);
|
||||
this.executeCallbacks = [];
|
||||
this.formats = {
|
||||
'application/wkt': new OpenLayers.Format.WKT(),
|
||||
'application/json': new OpenLayers.Format.GeoJSON()
|
||||
};
|
||||
},
|
||||
|
||||
/**
|
||||
* Method: describe
|
||||
* Makes the client issue a DescribeProcess request asynchronously.
|
||||
*
|
||||
* Parameters:
|
||||
* options - {Object} Configuration for the method call
|
||||
*
|
||||
* Available options:
|
||||
* callback - {Function} Callback to execute when the description is
|
||||
* available. Will be called with the parsed description as argument.
|
||||
* Optional.
|
||||
* scope - {Object} The scope in which the callback will be executed.
|
||||
* Default is the global object.
|
||||
*/
|
||||
describe: function(options) {
|
||||
options = options || {};
|
||||
if (!this.description) {
|
||||
this.client.describeProcess(this.server, this.identifier, function(description) {
|
||||
if (!this.description) {
|
||||
this.parseDescription(description);
|
||||
}
|
||||
if (options.callback) {
|
||||
options.callback.call(options.scope, this.description);
|
||||
}
|
||||
}, this);
|
||||
} else if (options.callback) {
|
||||
var description = this.description;
|
||||
window.setTimeout(function() {
|
||||
options.callback.call(options.scope, description);
|
||||
}, 0);
|
||||
}
|
||||
},
|
||||
|
||||
/**
|
||||
* APIMethod: configure
|
||||
* Configure the process, but do not execute it. Use this for processes
|
||||
* that are chained as input of a different process by means of the
|
||||
* <output> method.
|
||||
*
|
||||
* Parameters:
|
||||
* options - {Object}
|
||||
*
|
||||
* Returns:
|
||||
* {<OpenLayers.WPSProcess>} this process.
|
||||
*
|
||||
* Available options:
|
||||
* inputs - {Object} The inputs for the process, keyed by input identifier.
|
||||
* For spatial data inputs, the value of an input is usually an
|
||||
* <OpenLayers.Geometry>, an <OpenLayers.Feature.Vector> or an array of
|
||||
* geometries or features.
|
||||
* callback - {Function} Callback to call when the configuration is
|
||||
* complete. Optional.
|
||||
* scope - {Object} Optional scope for the callback.
|
||||
*/
|
||||
configure: function(options) {
|
||||
this.describe({
|
||||
callback: function() {
|
||||
var description = this.description,
|
||||
inputs = options.inputs,
|
||||
input, i, ii;
|
||||
for (i=0, ii=description.dataInputs.length; i<ii; ++i) {
|
||||
input = description.dataInputs[i];
|
||||
this.setInputData(input, inputs[input.identifier]);
|
||||
}
|
||||
if (options.callback) {
|
||||
options.callback.call(options.scope);
|
||||
}
|
||||
},
|
||||
scope: this
|
||||
});
|
||||
return this;
|
||||
},
|
||||
|
||||
/**
|
||||
* APIMethod: execute
|
||||
* Configures and executes the process
|
||||
*
|
||||
* Parameters:
|
||||
* options - {Object}
|
||||
*
|
||||
* Available options:
|
||||
* inputs - {Object} The inputs for the process, keyed by input identifier.
|
||||
* For spatial data inputs, the value of an input is usually an
|
||||
* <OpenLayers.Geometry>, an <OpenLayers.Feature.Vector> or an array of
|
||||
* geometries or features.
|
||||
* output - {String} The identifier of the output to request and parse.
|
||||
* Optional. If not provided, the first output will be requested.
|
||||
* success - {Function} Callback to call when the process is complete.
|
||||
* This function is called with an outputs object as argument, which
|
||||
* will have a property with the identifier of the requested output
|
||||
* (or 'result' if output was not configured). For processes that
|
||||
* generate spatial output, the value will be an array of
|
||||
* <OpenLayers.Feature.Vector> instances.
|
||||
* scope - {Object} Optional scope for the success callback.
|
||||
*/
|
||||
execute: function(options) {
|
||||
this.configure({
|
||||
inputs: options.inputs,
|
||||
callback: function() {
|
||||
var me = this;
|
||||
//TODO For now we only deal with a single output
|
||||
var outputIndex = this.getOutputIndex(
|
||||
me.description.processOutputs, options.output
|
||||
);
|
||||
me.setResponseForm({outputIndex: outputIndex});
|
||||
(function callback() {
|
||||
OpenLayers.Util.removeItem(me.executeCallbacks, callback);
|
||||
if (me.chained !== 0) {
|
||||
// need to wait until chained processes have a
|
||||
// description and configuration - see chainProcess
|
||||
me.executeCallbacks.push(callback);
|
||||
return;
|
||||
}
|
||||
// all chained processes are added as references now, so
|
||||
// let's proceed.
|
||||
OpenLayers.Request.POST({
|
||||
url: me.client.servers[me.server].url,
|
||||
data: new OpenLayers.Format.WPSExecute().write(me.description),
|
||||
success: function(response) {
|
||||
var output = me.description.processOutputs[outputIndex];
|
||||
var mimeType = me.findMimeType(
|
||||
output.complexOutput.supported.formats
|
||||
);
|
||||
//TODO For now we assume a spatial output
|
||||
var features = me.formats[mimeType].read(response.responseText);
|
||||
if (features instanceof OpenLayers.Feature.Vector) {
|
||||
features = [features];
|
||||
}
|
||||
if (options.success) {
|
||||
var outputs = {};
|
||||
outputs[options.output || 'result'] = features;
|
||||
options.success.call(options.scope, outputs);
|
||||
}
|
||||
},
|
||||
scope: me
|
||||
});
|
||||
})();
|
||||
},
|
||||
scope: this
|
||||
});
|
||||
},
|
||||
|
||||
/**
|
||||
* APIMethod: output
|
||||
* Chain an output of a configured process (see <configure>) as input to
|
||||
* another process.
|
||||
*
|
||||
* (code)
|
||||
* intersect = client.getProcess('opengeo', 'JTS:intersection');
|
||||
* intersect.configure({
|
||||
* // ...
|
||||
* });
|
||||
* buffer = client.getProcess('opengeo', 'JTS:buffer');
|
||||
* buffer.execute({
|
||||
* inputs: {
|
||||
* geom: intersect.output('result'), // <-- here we're chaining
|
||||
* distance: 1
|
||||
* },
|
||||
* // ...
|
||||
* });
|
||||
* (end)
|
||||
*
|
||||
* Parameters:
|
||||
* identifier - {String} Identifier of the output that we're chaining. If
|
||||
* not provided, the first output will be used.
|
||||
*/
|
||||
output: function(identifier) {
|
||||
return new OpenLayers.WPSProcess.ChainLink({
|
||||
process: this,
|
||||
output: identifier
|
||||
});
|
||||
},
|
||||
|
||||
/**
|
||||
* Method: parseDescription
|
||||
* Parses the DescribeProcess response
|
||||
*
|
||||
* Parameters:
|
||||
* description - {Object}
|
||||
*/
|
||||
parseDescription: function(description) {
|
||||
var server = this.client.servers[this.server];
|
||||
this.description = new OpenLayers.Format.WPSDescribeProcess()
|
||||
.read(server.processDescription[this.identifier])
|
||||
.processDescriptions[this.identifier];
|
||||
},
|
||||
|
||||
/**
|
||||
* Method: setInputData
|
||||
* Sets the data for a single input
|
||||
*
|
||||
* Parameters:
|
||||
* input - {Object} An entry from the dataInputs array of the process
|
||||
* description.
|
||||
* data - {Mixed} For spatial data inputs, this is usually an
|
||||
* <OpenLayers.Geometry>, an <OpenLayers.Feature.Vector> or an array of
|
||||
* geometries or features.
|
||||
*/
|
||||
setInputData: function(input, data) {
|
||||
// clear any previous data
|
||||
delete input.data;
|
||||
delete input.reference;
|
||||
if (data instanceof OpenLayers.WPSProcess.ChainLink) {
|
||||
++this.chained;
|
||||
input.reference = {
|
||||
method: 'POST',
|
||||
href: data.process.server === this.server ?
|
||||
this.localWPS : this.client.servers[data.process.server].url
|
||||
};
|
||||
data.process.describe({
|
||||
callback: function() {
|
||||
--this.chained;
|
||||
this.chainProcess(input, data);
|
||||
},
|
||||
scope: this
|
||||
});
|
||||
} else {
|
||||
input.data = {};
|
||||
var complexData = input.complexData;
|
||||
if (complexData) {
|
||||
var format = this.findMimeType(complexData.supported.formats);
|
||||
input.data.complexData = {
|
||||
mimeType: format,
|
||||
value: this.formats[format].write(this.toFeatures(data))
|
||||
};
|
||||
} else {
|
||||
input.data.literalData = {
|
||||
value: data
|
||||
};
|
||||
}
|
||||
}
|
||||
},
|
||||
|
||||
/**
|
||||
* Method: setResponseForm
|
||||
* Sets the responseForm property of the <execute> payload.
|
||||
*
|
||||
* Parameters:
|
||||
* options - {Object} See below.
|
||||
*
|
||||
* Available options:
|
||||
* outputIndex - {Integer} The index of the output to use. Optional.
|
||||
* supportedFormats - {Object} Object with supported mime types as key,
|
||||
* and true as value for supported types. Optional.
|
||||
*/
|
||||
setResponseForm: function(options) {
|
||||
options = options || {};
|
||||
output = this.description.processOutputs[options.outputIndex || 0];
|
||||
this.description.responseForm = {
|
||||
rawDataOutput: {
|
||||
identifier: output.identifier,
|
||||
mimeType: this.findMimeType(output.complexOutput.supported.formats, options.supportedFormats)
|
||||
}
|
||||
};
|
||||
},
|
||||
|
||||
/**
|
||||
* Method: getOutputIndex
|
||||
* Gets the index of a processOutput by its identifier
|
||||
*
|
||||
* Parameters:
|
||||
* outputs - {Array} The processOutputs array to look at
|
||||
* identifier - {String} The identifier of the output
|
||||
*
|
||||
* Returns
|
||||
* {Integer} The index of the processOutput with the provided identifier
|
||||
* in the outputs array.
|
||||
*/
|
||||
getOutputIndex: function(outputs, identifier) {
|
||||
var output;
|
||||
if (identifier) {
|
||||
for (var i=outputs.length-1; i>=0; --i) {
|
||||
if (outputs[i].identifier === identifier) {
|
||||
output = i;
|
||||
break;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
output = 0;
|
||||
}
|
||||
return output;
|
||||
},
|
||||
|
||||
/**
|
||||
* Method: chainProcess
|
||||
* Sets a fully configured chained process as input for this process.
|
||||
*
|
||||
* Parameters:
|
||||
* input - {Object} The dataInput that the chained process provides.
|
||||
* chainLink - {<OpenLayers.WPSProcess.ChainLink>} The process to chain.
|
||||
*/
|
||||
chainProcess: function(input, chainLink) {
|
||||
var output = this.getOutputIndex(
|
||||
chainLink.process.description.processOutputs, chainLink.output
|
||||
);
|
||||
input.reference.mimeType = this.findMimeType(
|
||||
input.complexData.supported.formats,
|
||||
chainLink.process.description.processOutputs[output].complexOutput.supported.formats
|
||||
);
|
||||
var formats = {};
|
||||
formats[input.reference.mimeType] = true;
|
||||
chainLink.process.setResponseForm({
|
||||
outputIndex: output,
|
||||
supportedFormats: formats
|
||||
});
|
||||
input.reference.body = chainLink.process.description;
|
||||
while (this.executeCallbacks.length > 0) {
|
||||
this.executeCallbacks[0]();
|
||||
}
|
||||
},
|
||||
|
||||
/**
|
||||
* Method: toFeatures
|
||||
* Converts spatial input into features so it can be processed by
|
||||
* <OpenLayers.Format> instances.
|
||||
*
|
||||
* Parameters:
|
||||
* source - {Mixed} An <OpenLayers.Geometry>, an
|
||||
* <OpenLayers.Feature.Vector>, or an array of geometries or features
|
||||
*
|
||||
* Returns:
|
||||
* {Array(<OpenLayers.Feature.Vector>)}
|
||||
*/
|
||||
toFeatures: function(source) {
|
||||
var isArray = OpenLayers.Util.isArray(source);
|
||||
if (!isArray) {
|
||||
source = [source];
|
||||
}
|
||||
var target = new Array(source.length),
|
||||
current;
|
||||
for (var i=0, ii=source.length; i<ii; ++i) {
|
||||
current = source[i];
|
||||
target[i] = current instanceof OpenLayers.Feature.Vector ?
|
||||
current : new OpenLayers.Feature.Vector(current);
|
||||
}
|
||||
return isArray ? target : target[0];
|
||||
},
|
||||
|
||||
/**
|
||||
* Method: findMimeType
|
||||
* Finds a supported mime type.
|
||||
*
|
||||
* Parameters:
|
||||
* sourceFormats - {Object} An object literal with mime types as key and
|
||||
* true as value for supported formats.
|
||||
* targetFormats - {Object} Like <sourceFormats>, but optional to check for
|
||||
* supported mime types on a different target than this process.
|
||||
* Default is to check against this process's supported formats.
|
||||
*
|
||||
* Returns:
|
||||
* {String} A supported mime type.
|
||||
*/
|
||||
findMimeType: function(sourceFormats, targetFormats) {
|
||||
targetFormats = targetFormats || this.formats;
|
||||
for (var f in sourceFormats) {
|
||||
if (f in targetFormats) {
|
||||
return f;
|
||||
}
|
||||
}
|
||||
},
|
||||
|
||||
CLASS_NAME: "OpenLayers.WPSProcess"
|
||||
|
||||
});
|
||||
|
||||
/**
|
||||
* Class: OpenLayers.WPSProcess.ChainLink
|
||||
* Type for chaining processes.
|
||||
*/
|
||||
OpenLayers.WPSProcess.ChainLink = OpenLayers.Class({
|
||||
|
||||
/**
|
||||
* Property: process
|
||||
* {<OpenLayers.WPSProcess>} The process to chain
|
||||
*/
|
||||
process: null,
|
||||
|
||||
/**
|
||||
* Property: output
|
||||
* {String} The output identifier of the output we are going to use as
|
||||
* input for another process.
|
||||
*/
|
||||
output: null,
|
||||
|
||||
/**
|
||||
* Constructor: OpenLayers.WPSProcess.ChainLink
|
||||
*
|
||||
* Parameters:
|
||||
* options - {Object} Properties to set on the instance.
|
||||
*/
|
||||
initialize: function(options) {
|
||||
OpenLayers.Util.extend(this, options);
|
||||
},
|
||||
|
||||
CLASS_NAME: "OpenLayers.WPSProcess.ChainLink"
|
||||
|
||||
});
|
||||
Reference in New Issue
Block a user