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

   1 /**
   2  */
   3 package net.kezvh.collections.views;
   4
   5 import java.util.AbstractMap;
   6 import java.util.AbstractSet;
   7 import java.util.Iterator;
   8 import java.util.Map;
   9 import java.util.Set;
  10
  11 /**
  12  * @author afflux
  13  * @param <K> FIXME comment
  14  * @param <V> FIXME comment
  15  */
  16 public class MapSlice<K, V> extends AbstractMap<K, V> {
  17         private final class EntrySet extends AbstractSet<Map.Entry<K, V>> {
  18                 private final Map<K, V> base;
  19                 private final Set<K> keys;
  20
  21                 EntrySet(final Map<K, V> base, final Set<K> keys) {
  22                         this.base = base;
  23                         this.keys = keys;
  24                 }
  25
  26                 /**
  27                  * @see java.util.AbstractCollection#iterator()
  28                  * @return x
  29                  */
  30                 @Override
  31                 public Iterator<java.util.Map.Entry<K, V>> iterator() {
  32                         return this.base.entrySet().iterator(); // FIXME this is garbage
  33                 }
  34
  35                 /**
  36                  * @see java.util.AbstractCollection#size()
  37                  * @return x
  38                  */
  39                 @Override
  40                 public int size() {
  41                         return this.keys.size();
  42                 }
  43
  44         }
  45
  46         private final EntrySet entrySet;
  47
  48         /**
  49          * @param base FIXME comment
  50          * @param keys FIXME comment
  51          */
  52         public MapSlice(final Map<K, V> base, final Set<K> keys) {
  53                 this.entrySet = new EntrySet(base, keys);
  54         }
  55
  56         /**
  57          * @see java.util.AbstractMap#entrySet()
  58          * @return x
  59          */
  60         @Override
  61         public Set<Map.Entry<K, V>> entrySet() {
  62                 return this.entrySet;
  63         }
  64
  65 }