Mangler pattern

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Mangler is a software design pattern. A Mangler is a pattern that performs multiple operations over a series of data, similar to the MapReduce function inside of Bigtable and . Typically, a mangler is fed a series of Maps from which it performs its internal operations and passes its internal state/data to an external Filter.

A typical usage of the Mangler Pattern is during internal search operations. When parsing a query from an end-user, the system will try to strip out a series of un-needed tokens, reassembling the original query into a more usable, functional query.

An important distinction between the Mangler and other patterns is the "Modify in place" optimization, pioneered by the pattern's creator.

This pattern was created by , during his tenure at TransUnion's Research and Development Lab.

Java[]

// This is a trivial implementation of Mangler in Java.

public interface TokenMangler {
	List<String> mangleTokens (List<String> tokens);
}

public class LowerCasingTokenMangler implements TokenMangler {

	List<String> mangleTokens (List<String> tokens) {
		List<String> results = new ArrayList<String>();

		for (String token : tokens) {
			results.add(token.toLowerCase());
		}

		return results;
	}
}