AngularJS dependency injection swap implementation

I'm still learning AngularJS, and have a question regarding their flavor of dependency injection. For example purposes, say I have a DataProcessor service which has a processData method that takes in a uri parameter and it needs to read that data (which may be xml, json, etc.) and then perform some actions on it. The DataProcessor constructor takes in an implementation of a DataReader interface that knows how to read a certain file type. Here are some example services of what I'm talking about:

// implementations of the DataReader interface
myApp.service('XmlDataReader', function() {
    this.readData = function(uri) {
        // read xml data from uri
    }
}]);

myApp.service('JsonDataReader', function() {
    this.readData = function(uri) {
        // read json data from uri
    }
}]);

// data processing service that takes in an implementation of a DataReader
myApp.service('DataProcessor', ['DataReader', function(DataReader) {

    this.processData = function(uri) {
        var readData = DataReader.readData(uri);

        // process data and return it
    }
}]);

From a typical dependency injection perspective, a specific type of DataReader could be passed into the DataProcessor and used like so:

var dataProcessor = new DataProcessor(new JsonDataReader());
var processedData = dataProcessor.processData('dataz.json');

What is the AngularJS way of doing this?