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Add polymorphism to MetricSnapshot class #101

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According to the Open Closed Principle (OCP) from SOLID principles, we refactored the MetricSnapshot class so that the method as_json is implemented in its subclasses (CompoundMetricSnapshot, HotspotMetricSnapshot and NativeMetricSnapshot), instead of checking the class in the parent method

@vitorbaraujo vitorbaraujo force-pushed the solid branch 5 times, most recently from e7d19eb to c2ac56f Compare June 27, 2017 19:15
Removing if's in parent method and providing implementation
in proper subclasses

Signed-off-by: Pedro Ivo Andrade <[email protected]>
Signed-off-by: Vitor Barbosa <[email protected]>
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