AbstractEntry.java

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package com.cliffc.aa.util;
 
import java.util.Map;
 
abstract class AbstractEntry<TypeK,TypeV> implements Map.Entry<TypeK,TypeV> {
  protected final TypeK _key; 
  protected       TypeV _val;
  
  public AbstractEntry(final TypeK key, final TypeV val) { _key = key;        _val = val; }
  public AbstractEntry(final Map.Entry<TypeK,TypeV> e  ) { _key = e.getKey(); _val = e.getValue(); }
  public String toString() { return _key + "=" + _val; }
  public TypeK getKey  () { return _key;  }
  public TypeV getValue() { return _val;  }
 
  public boolean equals(final Object o) {
    if (!(o instanceof Map.Entry)) return false;
    final Map.Entry e = (Map.Entry)o;
    return eq(_key, e.getKey()) && eq(_val, e.getValue());
  }
  
  public int hashCode() {
    return 
      ((_key == null) ? 0 : _key.hashCode()) ^
      ((_val == null) ? 0 : _val.hashCode());
  }
  
  private static boolean eq(final Object o1, final Object o2) {
    return (o1 == null ? o2 == null : o1.equals(o2));
  }
}