# all files / ol/proj/ transforms.js

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62.5% Branches 5/8
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     goog.provide('ol.proj.transforms');

    goog.require('ol.obj');

    /**
     * @private
     * @type {Object.<string, Object.<string, ol.TransformFunction>>}
     */
    ol.proj.transforms.cache_ = {};

    /**
     * Clear the transform cache.
     */
    ol.proj.transforms.clear = function() {
      ol.proj.transforms.cache_ = {};
    };

    /**
     * Registers a conversion function to convert coordinates from the source
     * projection to the destination projection.
     *
     * @param {ol.proj.Projection} source Source.
     * @param {ol.proj.Projection} destination Destination.
     * @param {ol.TransformFunction} transformFn Transform.
     */
    ol.proj.transforms.add = function(source, destination, transformFn) {
      var sourceCode = source.getCode();
      var destinationCode = destination.getCode();
      var transforms = ol.proj.transforms.cache_;
      if (!(sourceCode in transforms)) {
        transforms[sourceCode] = {};
      }
      transforms[sourceCode][destinationCode] = transformFn;
    };

    /**
     * Unregisters the conversion function to convert coordinates from the source
     * projection to the destination projection.  This method is used to clean up
     * cached transforms during testing.
     *
     * @param {ol.proj.Projection} source Source projection.
     * @param {ol.proj.Projection} destination Destination projection.
     * @return {ol.TransformFunction} transformFn The unregistered transform.
     */
    ol.proj.transforms.remove = function(source, destination) {
      var sourceCode = source.getCode();
      var destinationCode = destination.getCode();
      var transforms = ol.proj.transforms.cache_;
      var transform = transforms[sourceCode][destinationCode];
      delete transforms[sourceCode][destinationCode];
      if (ol.obj.isEmpty(transforms[sourceCode])) {
        delete transforms[sourceCode];
      }
      return transform;
    };

    /**
     * Get a transform given a source code and a destination code.
     * @param {string} sourceCode The code for the source projection.
     * @param {string} destinationCode The code for the destination projection.
     * @return {ol.TransformFunction|undefined} The transform function (if found).
     */
    ol.proj.transforms.get = function(sourceCode, destinationCode) {
      var transform;
      var transforms = ol.proj.transforms.cache_;
      Eif (sourceCode in transforms && destinationCode in transforms[sourceCode]) {
        transform = transforms[sourceCode][destinationCode];
      }
      return transform;
    };