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ArcRestSource.js
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ArcRestSource.js
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/**
* Created by
* User: mbertrand
* Date: 6/13/11
* Time: 8:16 AM
*
*/
/** api: (extends)
* plugins/LayerSource.js
*/
Ext.namespace("gxp.plugins");
/** api: constructor
* .. class:: ArcRestSource(config)
*
* Plugin for using ArcGIS REST layers with :class:`gxp.Viewer` instances.
*
*/
gxp.plugins.ArcRestSource = Ext.extend(gxp.plugins.LayerSource, {
/** api: ptype = gxp_arcrestsource */
ptype:"gxp_arcrestsource",
/** api: config[noLayersTitle]
* ``String``
* Title for no layers message (i18n).
*/
noLayersTitle: "No ArcGIS Layers",
/** api: config[noLayersText]
* ``String``
* Content of no layers message (i18n).
*/
noLayersText: "Could not find any layers with a compatible projection (Web Mercator) at ",
requiredProperties: ["name"],
constructor:function (config) {
this.config = config;
gxp.plugins.ArcRestSource.superclass.constructor.apply(this, arguments);
},
/** private: method[createStore]
*
* Creates a store of layers. This requires that the API script has already
* loaded. Fires the "ready" event when the store is loaded.
*/
createStore:function () {
var baseUrl = this.url.split("?")[0];
var source = this;
var processResult = function (response) {
var json = Ext.decode(response.responseText);
var layerProjection = source.getArcProjection(json.spatialReference.wkid);
var layers = [];
if (layerProjection != null) {
for (var l = 0; l < json.layers.length; l++) {
var layer = json.layers[l];
var layerShow = "show:" + layer.id;
layers.push(new OpenLayers.Layer.ArcGIS93Rest(layer.name, baseUrl + "/export",
{
layers:layerShow,
TRANSPARENT:true
},
{
isBaseLayer:false,
ratio: 1,
displayInLayerSwitcher:true,
visibility:true,
projection:layerProjection,
queryable:json.capabilities && json.capabilities.indexOf("Identify") > -1}
));
}
} else {
processFailure(response);
}
source.title = json.documentInfo.Title;
source.store = new GeoExt.data.LayerStore({
layers:layers,
fields:[
{name:"source", type:"string"},
{name:"name", type:"string", mapping:"name"},
{name:"layerid", type:"string"},
{name:"group", type:"string", defaultValue:this.title},
{name:"fixed", type:"boolean", defaultValue:false},
{name:"tiled", type:"boolean", defaultValue:true},
{name:"queryable", type:"boolean", defaultValue:true},
{name:"selected", type:"boolean"}
]
});
source.fireEvent("ready", source);
};
var processFailure = function (response) {
if (!response.isTimeout) {
Ext.Msg.alert(source.noLayersTitle, source.noLayersText + source.config.url);
}
source.fireEvent("failure", source);
};
this.lazy = this.isLazy();
if (!this.lazy) {
Ext.Ajax.request({
url:baseUrl,
timeout: 2000,
params:{'f':'json', 'pretty':'false', 'keepPostParams':'true'},
method:'POST',
success:processResult,
failure:processFailure
});
} else {
this.fireEvent("ready");
}
},
/** private: method[isLazy]
* :returns: ``Boolean``
*
* The store for a lazy source will not be loaded upon creation. A source
* determines whether or not it is lazy given the configured layers for
* the target. If the layer configs have all the information needed to
* construct layer records, the source can be lazy.
*/
isLazy: function() {
var lazy = true;
var sourceFound = false;
var mapConfig = this.target.initialConfig.map;
if (mapConfig && mapConfig.layers) {
var layerConfig;
for (var i=0, ii=mapConfig.layers.length; i<ii; ++i) {
layerConfig = mapConfig.layers[i];
if (layerConfig.source === this.id) {
sourceFound = true;
lazy = this.layerConfigComplete(layerConfig);
if (lazy === false) {
break;
}
}
}
}
return (lazy && sourceFound);
},
/** private: method[layerConfigComplete]
* :returns: ``Boolean``
*
* A layer configuration is considered complete if it has a title and a
* bbox.
*/
layerConfigComplete: function(config) {
var lazy = true;
var props = this.requiredProperties;
for (var i=props.length-1; i>=0; --i) {
lazy = !!config[props[i]];
if (lazy === false) {
break;
}
}
return lazy;
},
/** api: method[getConfigForRecord]
* :arg record: :class:`GeoExt.data.LayerRecord`
* :returns: ``Object``
*
* Create a config object that can be used to recreate the given record.
*/
createLayerRecord:function (config) {
var record, layer;
var cmp = function (l) {
return l.get("name") === config.name;
};
if (!this.lazy && this.store.findBy(cmp) > -1 ) {
record = this.store.getAt(this.store.findBy(cmp)).clone();
} else {
record = this.createLazyLayerRecord(config);
}
layer = record.getLayer();
if ("bbox" in config) {
layer.addOptions({"maxExtent": config.bbox});
} else {
this.setLayerBounds(layer);
}
// set layer title from config
if (config.title) {
layer.setName(config.title);
record.set("title", config.title);
}
// set visibility from config
if ("visibility" in config) {
layer.visibility = config.visibility;
}
if ("opacity" in config) {
layer.opacity = config.opacity;
}
if ("format" in config) {
layer.params.FORMAT = config.format;
record.set("format", config.format);
}
var singleTile = false;
if ("tiled" in config) {
singleTile = !config.tiled;
}
record.set("name", config.name);
record.set("layerid", config.layerid || layer.params.LAYERS);
record.set("format", config.format || "png");
record.set("tiled", "tiled" in config ? config.tiled : true);
record.set("srs", layer.projection.getCode());
record.set("selected", config.selected || false);
record.set("queryable", config.queryable || true);
record.set("source", config.source);
record.set("properties", "gxp_arcrestlayerpanel");
if ("group" in config) {
record.set("group", config.group);
}
record.commit();
return record;
},
/** api: method[getProjection]
* :arg layerRecord: ``GeoExt.data.LayerRecord`` a record from this
* source's store
* :returns: ``OpenLayers.Projection`` A suitable projection for the
* ``layerRecord``. If the layer is available in the map projection,
* the map projection will be returned. Otherwise an equal projection,
* or null if none is available.
*
* Get the projection that the source will use for the layer created in
* ``createLayerRecord``. If the layer is not available in a projection
* that fits the map projection, null will be returned.
*/
getArcProjection:function (srs) {
var projection = this.getMapProjection();
var compatibleProjection = projection;
var layerSRS = "EPSG:" + srs + '';
if (layerSRS !== projection.getCode()) {
compatibleProjection = null;
if ((p = new OpenLayers.Projection(layerSRS)).equals(projection)) {
compatibleProjection = p;
}
}
return compatibleProjection;
},
setLayerBounds: function (layer) {
var processResult = function (response) {
var json = Ext.decode(response.responseText);
if ("extent" in json) {
layer.addOptions({"maxExtent": [json.extent.xmin, json.extent.ymin, json.extent.xmax, json.extent.ymax]});
}
};
var response = Ext.Ajax.request({
timeout: 2000,
params:{'f':'json', 'pretty':'false', 'keepPostParams':'true'},
method:'POST',
url: this.url.split("?")[0] + "/" + layer.params.LAYERS.replace("show:",""),
success: processResult
});
json = Ext.decode(response.responseText);
},
/** private: method[createLazyLayerRecord]
* :arg config: ``Object`` The application config for this layer.
* :returns: ``GeoExt.data.LayerRecord``
*
* Create a minimal layer record
*/
createLazyLayerRecord: function(config) {
var srs = config.srs || this.target.map.projection;
config.srs = {};
config.srs[srs] = true;
var record = new GeoExt.data.LayerRecord(config);
record.setLayer(new OpenLayers.Layer.ArcGIS93Rest(config.name, this.url.split("?")[0] + "/export",
{
layers: config.layerid,
TRANSPARENT:true,
FORMAT: "format" in config ? config.format : "png"
},
{
isBaseLayer:false,
displayInLayerSwitcher:true,
projection:srs,
singleTile: "tiled" in config ? !config.tiled : false,
queryable: "queryable" in config ? config.queryable : false}
)
);
return record;
},
/** api: method[getConfigForRecord]
* :arg record: :class:`GeoExt.data.LayerRecord`
* :returns: ``Object``
*
* Create a config object that can be used to recreate the given record.
*/
getConfigForRecord: function(record) {
var layer = record.getLayer();
return {
source: record.get("source"),
name: record.get("name"),
title: record.get("title"),
tiled: record.get("tiled"),
visibility: layer.getVisibility(),
layerid: layer.params.LAYERS,
format: layer.params.FORMAT,
opacity: layer.opacity || undefined,
group: record.get("group"),
fixed: record.get("fixed"),
selected: record.get("selected"),
srs: record.get("srs"),
bbox: layer.maxExtent.toArray()
};
}
});
Ext.preg(gxp.plugins.ArcRestSource.prototype.ptype, gxp.plugins.ArcRestSource);