Package com.thoughtworks.xstream.core.util

Class WeakCache

  • All Implemented Interfaces:
    java.util.Map
    public class WeakCache
extends java.util.AbstractMap
    A HashMap implementation with weak references values and by default for the key. When the value is garbage collected, the key will also vanish from the map.
    Since:
    1.4

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description
      private static interface  WeakCache.Visitor  

      • 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>

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private java.util.Map map  

    • Constructor Summary

      Constructors 
      Constructor Description
      WeakCache()
      Construct a WeakCache with weak keys.
      WeakCache​(java.util.Map map)
      Construct a WeakCache.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void clear()  
      boolean containsKey​(java.lang.Object key)  
      boolean containsValue​(java.lang.Object value)  
      protected java.lang.ref.Reference createReference​(java.lang.Object value)  
      java.util.Set entrySet()  
      boolean equals​(java.lang.Object o)  
      java.lang.Object get​(java.lang.Object key)  
      int hashCode()  
      private java.lang.Object iterate​(WeakCache.Visitor visitor, int type)  
      java.util.Set keySet()  
      java.lang.Object put​(java.lang.Object key, java.lang.Object value)  
      java.lang.Object remove​(java.lang.Object key)  
      int size()  
      java.lang.String toString()  
      java.util.Collection values()  

      • Methods inherited from class java.util.AbstractMap

        clone, isEmpty, putAll

      • 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

    • Field Detail

      • map

        private final java.util.Map map

    • Constructor Detail

      • WeakCache

        public WeakCache()
        Construct a WeakCache with weak keys.

        Note, that the internally used WeakHashMap is not thread-safe.

        Parameters:
        map - the map to use
        Since:
        1.4

      • WeakCache

        public WeakCache​(java.util.Map map)
        Construct a WeakCache.
        Parameters:
        map - the map to use
        Since:
        1.4

    • Method Detail

      • 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

      • 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

      • remove

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

      • createReference

        protected java.lang.ref.Reference createReference​(java.lang.Object value)

      • containsValue

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

      • size

        public int size()
        Specified by:
        size in interface java.util.Map
        Overrides:
        size in class java.util.AbstractMap

      • values

        public java.util.Collection values()
        Specified by:
        values in interface java.util.Map
        Overrides:
        values 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

      • iterate

        private java.lang.Object iterate​(WeakCache.Visitor visitor,
                                 int type)

      • containsKey

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

      • clear

        public void clear()
        Specified by:
        clear in interface java.util.Map
        Overrides:
        clear in class java.util.AbstractMap

      • keySet

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

      • equals

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

      • hashCode

        public int hashCode()
        Specified by:
        hashCode in interface java.util.Map
        Overrides:
        hashCode in class java.util.AbstractMap

      • toString

        public java.lang.String toString()
        Overrides:
        toString in class java.util.AbstractMap