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Adding a BBOX strategy. This triggers requests for data within a bounding box. When the map bounds invalidate previous data bounds, another request is issued. Reads are triggered with a spatial filter, and protocols that understand how to deal with filters may serialize the filter to request a subset of the data collection. The HTTP protocol understands one filter - the bbox filter. So the BBOX strategy can be used in conjunction with the HTTP protocol to request data via http in a bounding box. Thanks for the collaboration and tests Eric. r=elemoine,crschmidt (#1731)

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git-svn-id: http://svn.openlayers.org/trunk/openlayers@8000 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
Tim Schaub
2008-09-11 17:39:41 +00:00
parent 1662f2adba
commit 33fbc1d22f
7 changed files with 484 additions and 0 deletions
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17
lib/OpenLayers/Protocol/HTTP.js
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@@ -112,6 +112,15 @@ OpenLayers.Protocol.HTTP = OpenLayers.Class(OpenLayers.Protocol, {
* options - {Object} Optional object for configuring the request.
* This object is modified and should not be reused.
*
* Valid options:
* url - {String} Url for the request.
* params - {Object} Parameters to get serialized as a query string.
* headers - {Object} Headers to be set on the request.
* filter - {<OpenLayers.Filter.BBOX>} If a bbox filter is sent, it will be
* serialized according to the OpenSearch Geo extension
* (bbox=minx,miny,maxx,maxy). Note that a BBOX filter as the child
* of a logical filter will not be serialized.
*
* Returns:
* {<OpenLayers.Protocol.Response>} A response object, whose "priv" property
* references the HTTP request, this object is also passed to the
@@ -121,6 +130,14 @@ OpenLayers.Protocol.HTTP = OpenLayers.Class(OpenLayers.Protocol, {
read: function(options) {
options = OpenLayers.Util.applyDefaults(options, this.options);
var resp = new OpenLayers.Protocol.Response({requestType: "read"});
if(options.filter && options.filter instanceof OpenLayers.Filter.Spatial) {
if(options.filter.type == OpenLayers.Filter.Spatial.BBOX) {
options.params = OpenLayers.Util.extend(options.params, {
bbox: options.filter.value.toArray()
});
}
}
resp.priv = OpenLayers.Request.GET({
url: options.url,