What kind of figurative language is this sentence The public are swine advertising is the rattling of a stick inside a swill-bucket.?

The sentence employs metaphor and simile as forms of figurative language. The comparison of "the public" to "swine" suggests a derogatory view of people's consumption habits, while the phrase "the rattling of a stick inside a swill-bucket" evokes a vivid image of noise and chaos, emphasizing the disruptive and unpleasant nature of advertising. Together, these elements illustrate the author's disdain for both the public's gullibility and the tactics of advertisers.