Package com.sleepycat.collections

Class MapEntryParameter<K,V>

java.lang.Object
com.sleepycat.collections.MapEntryParameter<K,V>
All Implemented Interfaces:
Map.Entry<K,V>
public class MapEntryParameter<K,V> extends Object implements Map.Entry<K,V>
A simple Map.Entry implementation that can be used as in input parameter. Since a MapEntryParameter is not obtained from a map, it is not attached to any map in particular. To emphasize that changing this object does not change the map, the setValue(V) method always throws UnsupportedOperationException.

Warning: Use of this interface violates the Java Collections interface contract since these state that Map.Entry objects should only be obtained from Map.entrySet() sets, while this class allows constructing them directly. However, it is useful for performing operations on an entry set such as add(), contains(), etc. For restrictions see getValue() and setValue(V).

  • Constructor Details

    • MapEntryParameter

      public MapEntryParameter(K key, V value)
      Creates a map entry with a given key and value.
      Parameters:
      key - is the key to use.
      value - is the value to use.

  • Method Details

    • hashCode

      public int hashCode()
      Computes a hash code as specified by Map.Entry.hashCode().
      Specified by:
      hashCode in interface Map.Entry<K,V>
      Overrides:
      hashCode in class Object
      Returns:
      the computed hash code.

    • equals

      public boolean equals(Object other)
      Compares this entry to a given entry as specified by Map.Entry.equals(java.lang.Object).
      Specified by:
      equals in interface Map.Entry<K,V>
      Overrides:
      equals in class Object
      Returns:
      the computed hash code.

    • getKey

      public final K getKey()
      Returns the key of this entry.
      Specified by:
      getKey in interface Map.Entry<K,V>
      Returns:
      the key of this entry.

    • getValue

      public final V getValue()
      Returns the value of this entry. Note that this will be the value passed to the constructor or the last value passed to setValue(V). It will not reflect changes made to a Map.
      Specified by:
      getValue in interface Map.Entry<K,V>
      Returns:
      the value of this entry.

    • setValue

      public V setValue(V newValue)
      Always throws UnsupportedOperationException since this object is not attached to a map.
      Specified by:
      setValue in interface Map.Entry<K,V>

    • toString

      public String toString()
      Converts the entry to a string representation for debugging.
      Overrides:
      toString in class Object
      Returns:
      the string representation.