Package org.biojava.utils.cache

Class WeakValueHashMap

  • All Implemented Interfaces:
    java.util.Map
    public class WeakValueHashMap
extends java.util.AbstractMap
    Map implementation which keeps weak references to values. Entries are removed from the map when their value is no longer reachable using normal (hard) references. This is useful for maintaining canonical copies of objects without forcing these objects to remain in memory forever.

    Note that this is distinct from the standard library class, WeakHashMap which has weak keys.

    Since:
    1.3
    Author:
    Thomas Down

    • Nested Class Summary

      • Nested classes/interfaces inherited from class java.util.AbstractMap

        java.util.AbstractMap.SimpleEntry<K extends java.lang.Object,​V extends java.lang.Object>, java.util.AbstractMap.SimpleImmutableEntry<K extends java.lang.Object,​V extends java.lang.Object>

      • Nested classes/interfaces inherited from interface java.util.Map

        java.util.Map.Entry<K extends java.lang.Object,​V extends java.lang.Object>

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      boolean containsKey​(java.lang.Object o)  
      java.util.Set entrySet()  
      java.lang.Object get​(java.lang.Object key)  
      java.lang.Object put​(java.lang.Object key, java.lang.Object value)  

      • Methods inherited from class java.util.AbstractMap

        clear, clone, containsValue, equals, hashCode, isEmpty, keySet, putAll, remove, size, toString, values

      • Methods inherited from class java.lang.Object

        finalize, getClass, notify, notifyAll, wait, wait, wait

      • Methods inherited from interface java.util.Map

        compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

    • Constructor Detail

      • WeakValueHashMap

        public WeakValueHashMap()

    • Method Detail

      • put

        public java.lang.Object put​(java.lang.Object key,
                            java.lang.Object value)
        Specified by:
        put in interface java.util.Map
        Overrides:
        put in class java.util.AbstractMap

      • get

        public java.lang.Object get​(java.lang.Object key)
        Specified by:
        get in interface java.util.Map
        Overrides:
        get in class java.util.AbstractMap

      • containsKey

        public boolean containsKey​(java.lang.Object o)
        Specified by:
        containsKey in interface java.util.Map
        Overrides:
        containsKey in class java.util.AbstractMap

      • entrySet

        public java.util.Set entrySet()
        Specified by:
        entrySet in interface java.util.Map
        Specified by:
        entrySet in class java.util.AbstractMap