MetadataInterface|null getMetadata()
Returns the metadata for the currently validated value.
With the core implementation, this method returns a {@link Mapping\ClassMetadataInterface} instance if the current value is an object, a {@link Mapping\PropertyMetadata} instance if the current value is the value of a property and a {@link Mapping\GetterMetadata} instance if the validated value is the result of a getter method.
If the validated value is neither of these, for example if the validator has been called with a plain value and constraint, this method returns null.
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