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/* Copyright (c) 2006-2013 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/Console.js
* @requires OpenLayers/Format.js
* @requires OpenLayers/Filter/Spatial.js
* @requires OpenLayers/Filter/Comparison.js
* @requires OpenLayers/Filter/Logical.js
*/
/**
* Class: OpenLayers.Format.QueryStringFilter
* Parser for reading a query string and creating a simple filter.
*
* Inherits from:
* - <OpenLayers.Format>
*/
OpenLayers.Format.QueryStringFilter = (function() {
/**
* Map the OpenLayers.Filter.Comparison types to the operation strings of
* the protocol.
*/
var cmpToStr = {};
cmpToStr[OpenLayers.Filter.Comparison.EQUAL_TO] = "eq";
cmpToStr[OpenLayers.Filter.Comparison.NOT_EQUAL_TO] = "ne";
cmpToStr[OpenLayers.Filter.Comparison.LESS_THAN] = "lt";
cmpToStr[OpenLayers.Filter.Comparison.LESS_THAN_OR_EQUAL_TO] = "lte";
cmpToStr[OpenLayers.Filter.Comparison.GREATER_THAN] = "gt";
cmpToStr[OpenLayers.Filter.Comparison.GREATER_THAN_OR_EQUAL_TO] = "gte";
cmpToStr[OpenLayers.Filter.Comparison.LIKE] = "ilike";
/**
* Function: regex2value
* Convert the value from a regular expression string to a LIKE/ILIKE
* string known to the web service.
*
* Parameters:
* value - {String} The regex string.
*
* Returns:
* {String} The converted string.
*/
function regex2value(value) {
// highly sensitive!! Do not change this without running the
// Protocol/HTTP.html unit tests
// convert % to \%
value = value.replace(/%/g, "\\%");
// convert \\. to \\_ (\\.* occurences converted later)
value = value.replace(/\\\\\.(\*)?/g, function($0, $1) {
return $1 ? $0 : "\\\\_";
});
// convert \\.* to \\%
value = value.replace(/\\\\\.\*/g, "\\\\%");
// convert . to _ (\. and .* occurences converted later)
value = value.replace(/(\\)?\.(\*)?/g, function($0, $1, $2) {
return $1 || $2 ? $0 : "_";
});
// convert .* to % (\.* occurnces converted later)
value = value.replace(/(\\)?\.\*/g, function($0, $1) {
return $1 ? $0 : "%";
});
// convert \. to .
value = value.replace(/\\\./g, ".");
// replace \* with * (watching out for \\*)
value = value.replace(/(\\)?\\\*/g, function($0, $1) {
return $1 ? $0 : "*";
});
return value;
}
return OpenLayers.Class(OpenLayers.Format, {
/**
* Property: wildcarded.
* {Boolean} If true percent signs are added around values
* read from LIKE filters, for example if the protocol
* read method is passed a LIKE filter whose property
* is "foo" and whose value is "bar" the string
* "foo__ilike=%bar%" will be sent in the query string;
* defaults to false.
*/
wildcarded: false,
/**
* APIProperty: srsInBBOX
* {Boolean} Include the SRS identifier in BBOX query string parameter.
* Default is false. If true and the layer has a projection object set,
* any BBOX filter will be serialized with a fifth item identifying the
* projection. E.g. bbox=-1000,-1000,1000,1000,EPSG:900913
*/
srsInBBOX: false,
/**
* APIMethod: write
* Serialize an <OpenLayers.Filter> objects using the "simple" filter syntax for
* query string parameters. This function must be called as a method of
* a protocol instance.
*
* Parameters:
* filter - {<OpenLayers.Filter>} filter to convert.
* params - {Object} The parameters object.
*
* Returns:
* {Object} The resulting parameters object.
*/
write: function(filter, params) {
params = params || {};
var className = filter.CLASS_NAME;
var filterType = className.substring(className.lastIndexOf(".") + 1);
switch (filterType) {
case "Spatial":
switch (filter.type) {
case OpenLayers.Filter.Spatial.BBOX:
params.bbox = filter.value.toArray();
if (this.srsInBBOX && filter.projection) {
params.bbox.push(filter.projection.getCode());
}
break;
case OpenLayers.Filter.Spatial.DWITHIN:
params.tolerance = filter.distance;
// no break here
case OpenLayers.Filter.Spatial.WITHIN:
params.lon = filter.value.x;
params.lat = filter.value.y;
break;
default:
OpenLayers.Console.warn(
"Unknown spatial filter type " + filter.type);
}
break;
case "Comparison":
var op = cmpToStr[filter.type];
if (op !== undefined) {
var value = filter.value;
if (filter.type == OpenLayers.Filter.Comparison.LIKE) {
value = regex2value(value);
if (this.wildcarded) {
value = "%" + value + "%";
}
}
params[filter.property + "__" + op] = value;
params.queryable = params.queryable || [];
params.queryable.push(filter.property);
} else {
OpenLayers.Console.warn(
"Unknown comparison filter type " + filter.type);
}
break;
case "Logical":
if (filter.type === OpenLayers.Filter.Logical.AND) {
for (var i=0,len=filter.filters.length; i<len; i++) {
params = this.write(filter.filters[i], params);
}
} else {
OpenLayers.Console.warn(
"Unsupported logical filter type " + filter.type);
}
break;
default:
OpenLayers.Console.warn("Unknown filter type " + filterType);
}
return params;
},
CLASS_NAME: "OpenLayers.Format.QueryStringFilter"
});
})();