org.hd.d.pg2k.svrCore
Class Compact7BitString.WithDict

java.lang.Object
  org.hd.d.pg2k.svrCore.Compact7BitString
      org.hd.d.pg2k.svrCore.Compact7BitString.WithDict

All Implemented Interfaces:

java.io.ObjectInputValidation, java.io.Serializable, MemoryTools.Internable

Enclosing class:

Compact7BitString

private static final class Compact7BitString.WithDict
extends Compact7BitString

Specialised immutable sub-class to allow use with a StaticDictionary. Not directly visible outside this class, but is constructed by convertToCompact7BitString() as necessary.

Note that this can never be directly (de)serialised since this forces itself to String form when serialisation is attempted. This is because we cannot efficiently serialise the dictionary and thus would nto have enough information to ensure correct decoding.

dict

private final Compact7BitString.StaticDictionary dict

Static dictionary (if any) used to aid compression; never null. It is forbidden to serialise an instance as-is so as to prevent decompression errors/ambiguitites, so these sub-classes as always serialised as String instances.

_hash

private int _hash

Cache of the hash code for speed. Since we've blown some extra space on the (reference) to the dictionary, we'll blow a little more on a cache since hash computation can be expensive.

We assume that it has not been computed and cached if zero.

serialVersionUID

private static final long serialVersionUID

Serialisation UID; never really used.

See Also:

Constant Field Values

Compact7BitString.WithDict

private Compact7BitString.WithDict(byte[] text,
                                   Compact7BitString.StaticDictionary dict)

writeReplace

protected java.lang.Object writeReplace()
                                 throws java.io.ObjectStreamException

Always write as (ie return) a String; never null.

Overrides:

writeReplace in class Compact7BitString

Throws:

java.io.ObjectStreamException

getDict

protected Compact7BitString.StaticDictionary getDict()

Get the static dictionary, null if none.

Overrides:

getDict in class Compact7BitString

hashCode

public int hashCode()

Derive (and cache) a hash based on the text and the dictionary. This adds in some distinguishing sauce from the dictionary to better spread out hash codes from C7BS texts.

Overrides:

hashCode in class Compact7BitString