PathSegment class abstract
Each path partition (between "/") is PathSegment.
PathSegment only use for building call tree.
There is two kind of PathSegment.
host/{user}/info
- 
NamedSegment is not handle any parameters. "info" is named segment. 
- 
ArgumentSegment is handle this segment value and next route if possible. "{user}" is argument segment 
Look CallingPathSegment for happening values during the call.
- Implementers
- Annotations
- 
    - @immutable
 
Constructors
- PathSegment(String name)
- 
          Automatically create ArgumentSegment or NamedSegment.
            factory
Properties
- hashCode → int
- 
  The hash code for this object.
  no setteroverride
- isArgument → bool
- 
  
  no setter
- isRoot → bool
- 
  Is root of parent segment
  no setter
- isUnknown → bool
- 
  Path Segment is unknown.
if isUnknown is true, calling
unknown route of binding
  no setter
- name → String
- 
  Path Segment Name
  final
- runtimeType → Type
- 
  A representation of the runtime type of the object.
  no setterinherited
Methods
- 
  noSuchMethod(Invocation invocation) → dynamic 
- 
  Invoked when a nonexistent method or property is accessed.
  inherited
- 
  toString() → String 
- 
  A string representation of this object.
  override
Operators
- 
  operator ==(Object other) → bool 
- 
  The equality operator.
  override