KezvhLib/src-lib/net/kezvh/collections/views/ConditionalCollectionView.java

   1 /**
   2  *
   3  */
   4 package net.kezvh.collections.views;
   5
   6 import java.util.AbstractCollection;
   7 import java.util.Collection;
   8 import java.util.Iterator;
   9
  10 import net.kezvh.functional.Operations;
  11 import net.kezvh.functional.lambda.L1;
  12
  13 /**
  14  * @author afflux
  15  *
  16  * @param <E> collection element type
  17  */
  18 public class ConditionalCollectionView<E> extends AbstractCollection<E> {
  19         private final Collection<? extends E> innerCollection;
  20         private final L1<Boolean, ? super E> filter;
  21
  22         /**
  23          * @param predicate condition
  24          * @param innerCollection original elements
  25          */
  26         public ConditionalCollectionView(final L1<Boolean, ? super E> predicate, final Collection<? extends E> innerCollection) {
  27                 super();
  28                 this.filter = predicate;
  29                 this.innerCollection = innerCollection;
  30         }
  31
  32         /**
  33          * @see java.util.AbstractCollection#iterator()
  34          * @return iterator
  35          */
  36         @Override
  37         public Iterator<E> iterator() {
  38                 return new ConditionalIteratorView<E>(this.filter, this.innerCollection.iterator());
  39         }
  40
  41         /**
  42          * @see java.util.AbstractCollection#size()
  43          * @return the size of the collection
  44          */
  45         @Override
  46         public int size() {
  47                 return Operations.ITERATOR_COUNT.op(this.iterator());
  48         }
  49
  50 }