Package com.espertech.esper.common.internal.collection.apachecommons

Class AbstractReferenceMap.ReferenceEntry

java.lang.Object
com.espertech.esper.common.internal.collection.apachecommons.AbstractHashedMap.HashEntry
com.espertech.esper.common.internal.collection.apachecommons.AbstractReferenceMap.ReferenceEntry
All Implemented Interfaces:
KeyValue, Map.Entry
Enclosing class:
AbstractReferenceMap
protected static class AbstractReferenceMap.ReferenceEntry extends AbstractHashedMap.HashEntry
A MapEntry implementation for the map.

If getKey() or getValue() returns null, it means the mapping is stale and should be removed.

Since:
Commons Collections 3.1

  • Field Details

  • Constructor Details

    • ReferenceEntry

      public ReferenceEntry(AbstractReferenceMap parent, AbstractHashedMap.HashEntry next, int hashCode, Object key, Object value)
      Creates a new entry object for the ReferenceMap.
      Parameters:
      parent - the parent map
      next - the next entry in the hash bucket
      hashCode - the hash code of the key
      key - the key
      value - the value

  • Method Details

    • getKey

      public Object getKey()
      Gets the key from the entry. This method dereferences weak and soft keys and thus may return null.
      Specified by:
      getKey in interface KeyValue
      Specified by:
      getKey in interface Map.Entry
      Overrides:
      getKey in class AbstractHashedMap.HashEntry
      Returns:
      the key, which may be null if it was garbage collected

    • getValue

      public Object getValue()
      Gets the value from the entry. This method dereferences weak and soft value and thus may return null.
      Specified by:
      getValue in interface KeyValue
      Specified by:
      getValue in interface Map.Entry
      Overrides:
      getValue in class AbstractHashedMap.HashEntry
      Returns:
      the value, which may be null if it was garbage collected

    • setValue

      public Object setValue(Object obj)
      Sets the value of the entry.
      Specified by:
      setValue in interface Map.Entry
      Overrides:
      setValue in class AbstractHashedMap.HashEntry
      Parameters:
      obj - the object to store
      Returns:
      the previous value

    • equals

      public boolean equals(Object obj)
      Compares this map entry to another.

      This implementation uses isEqualKey and isEqualValue on the main map for comparison.

      Specified by:
      equals in interface Map.Entry
      Overrides:
      equals in class AbstractHashedMap.HashEntry
      Parameters:
      obj - the other map entry to compare to
      Returns:
      true if equal, false if not

    • hashCode

      public int hashCode()
      Gets the hashcode of the entry using temporary hard references.

      This implementation uses hashEntry on the main map.

      Specified by:
      hashCode in interface Map.Entry
      Overrides:
      hashCode in class AbstractHashedMap.HashEntry
      Returns:
      the hashcode of the entry

    • toReference

      protected Object toReference(int type, Object referent, int hash)
      Constructs a reference of the given type to the given referent. The reference is registered with the queue for later purging.
      Parameters:
      type - HARD, SOFT or WEAK
      referent - the object to refer to
      hash - the hash code of the key of the mapping; this number might be different from referent.hashCode() if the referent represents a value and not a key
      Returns:
      reference

    • next

      protected AbstractReferenceMap.ReferenceEntry next()
      Gets the next entry in the bucket.
      Returns:
      the next entry in the bucket