Returns a transformed bag backed by the given collection. - Android java.util

Android examples for java.util:Collection

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Description

Returns a transformed bag backed by the given collection.

Demo Code

/*// www. java2 s. c om
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import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.function.Function;

public class Main {
  /**
   * Returns a transformed bag backed by the given collection.
   * <p/>
   * Each object is passed through the transformer as it is added to the
   * Collection.
   * 
   * @param <S>
   *          - type for element in source collection
   * @param <D>
   *          - type for element in destination collection
   * @param source
   *          - the collection to predicate, must not be null
   * @param transformer
   *          - the transformer for the collection, must not be null
   * @return a transformed collection backed by the given collection
   * @throws IllegalArgumentException
   *           - if the Collection or Transformer is null
   */
  public static <S, D> Collection<D> transform(Collection<S> source,
      Function<S, D> transformer) {
    if (source == null) {
      throw new IllegalArgumentException("Source parameter is required");
    } else if (transformer == null) {
      throw new IllegalArgumentException("Transformer parameter is required");
    }

    List<D> dest = new ArrayList<D>();
    for (S sourceElem : source) {
      dest.add(transformer.apply(sourceElem));
    }
    return dest;
  }
}

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