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  1. public final class BuilderUtils {
  2.  
  3. private BuilderUtils () {
  4. throw new UnsupportedOperationException("do not call")
  5. }
  6.  
  7. public static <B> List<B> convertBuilderList(List<? extends ModelBuilder<B>> toConvert) {
  8.             if (CollectionUtils.isEmpty(toConvert)) {
  9.                 return Collections.emptyList();
  10.             }
  11.  
  12.             final List<B> results = new ArrayList<B>(toConvert.size());
  13.             for (ModelBuilder<B> elem : toConvert) {
  14.                 if (elem != null) {
  15.                     results.add(elem.build());
  16.                 }
  17.             }
  18.             return Collections.unmodifiableList(results);
  19.         }
  20.  
  21.         public static <B> Collection<B> convertBuilderCollection(Collection<? extends ModelBuilder<B>> toConvert) {
  22.             if (CollectionUtils.isEmpty(toConvert)) {
  23.                 return Collections.emptyList();
  24.             }
  25.  
  26.             final Collection<B> results = new ArrayList<B>(toConvert.size());
  27.             for (ModelBuilder<B> elem : toConvert) {
  28.                 if (elem != null) {
  29.                     results.add(elem.build());
  30.                 }
  31.             }
  32.             return Collections.unmodifiableCollection(results);
  33.         }
  34.  
  35.         public static <B> Set<B> convertBuilderSet(Set<? extends ModelBuilder<B>> toConvert) {
  36.             if (CollectionUtils.isEmpty(toConvert)) {
  37.                 return Collections.emptySet();
  38.             }
  39.  
  40.             final Set<B> results = new HashSet<B>(toConvert.size());
  41.             for (ModelBuilder<B> elem : toConvert) {
  42.                 if (elem != null) {
  43.                     results.add(elem.build());
  44.                 }
  45.             }
  46.             return Collections.unmodifiableSet(results);
  47.         }
  48. }
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