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Reflection
Michal Pıse (CTU in Prague) Object Programming Lect. 12: Reflection and Metadata December 14, 2010 2 / 10
Terminology
Introspection—self-representation can be queried.
Intercession—self-representation can be changed.
Michal Pıse (CTU in Prague) Object Programming Lect. 12: Reflection and Metadata December 14, 2010 3 / 10
Terminology
Introspection—self-representation can be queried.
Intercession—self-representation can be changed.
Michal Pıse (CTU in Prague) Object Programming Lect. 12: Reflection and Metadata December 14, 2010 3 / 10
Terminology (II)
Structural reflection—concerned with structure.
Behavioral reflection—concerned with execution.
Michal Pıse (CTU in Prague) Object Programming Lect. 12: Reflection and Metadata December 14, 2010 4 / 10
Terminology (II)
Structural reflection—concerned with structure.
Behavioral reflection—concerned with execution.
Michal Pıse (CTU in Prague) Object Programming Lect. 12: Reflection and Metadata December 14, 2010 4 / 10
Reflection in Object Languages
Everything is an object.
Michal Pıse (CTU in Prague) Object Programming Lect. 12: Reflection and Metadata December 14, 2010 5 / 10
Purpose
Tools.
Michal Pıse (CTU in Prague) Object Programming Lect. 12: Reflection and Metadata December 14, 2010 6 / 10
Alternative
Source code
Byte code
AST
Custom represenation
Michal Pıse (CTU in Prague) Object Programming Lect. 12: Reflection and Metadata December 14, 2010 7 / 10
Metadata
Michal Pıse (CTU in Prague) Object Programming Lect. 12: Reflection and Metadata December 14, 2010 8 / 10
What Is Metadata?
Field and method names
Class names
Various modifiers
Even type information
More or less anything that is not compiled into binary
Michal Pıse (CTU in Prague) Object Programming Lect. 12: Reflection and Metadata December 14, 2010 9 / 10
What Is Metadata?
Field and method names
Class names
Various modifiers
Even type information
More or less anything that is not compiled into binary
Michal Pıse (CTU in Prague) Object Programming Lect. 12: Reflection and Metadata December 14, 2010 9 / 10
What Is Metadata?
Field and method names
Class names
Various modifiers
Even type information
More or less anything that is not compiled into binary
Michal Pıse (CTU in Prague) Object Programming Lect. 12: Reflection and Metadata December 14, 2010 9 / 10
What Is Metadata?
Field and method names
Class names
Various modifiers
Even type information
More or less anything that is not compiled into binary
Michal Pıse (CTU in Prague) Object Programming Lect. 12: Reflection and Metadata December 14, 2010 9 / 10
What Is Metadata?
Field and method names
Class names
Various modifiers
Even type information
More or less anything that is not compiled into binary
Michal Pıse (CTU in Prague) Object Programming Lect. 12: Reflection and Metadata December 14, 2010 9 / 10
Is Metadata Used Outside of Source Code?
Yes
Whenever we are referring to a class we are supplying it with anadditional information
Why don’t we include metadata in the source code? Is it possible?
Michal Pıse (CTU in Prague) Object Programming Lect. 12: Reflection and MetadataDecember 14, 2010 10 / 10
Is Metadata Used Outside of Source Code?
Yes
Whenever we are referring to a class we are supplying it with anadditional information
Why don’t we include metadata in the source code? Is it possible?
Michal Pıse (CTU in Prague) Object Programming Lect. 12: Reflection and MetadataDecember 14, 2010 10 / 10
Is Metadata Used Outside of Source Code?
Yes
Whenever we are referring to a class we are supplying it with anadditional information
Why don’t we include metadata in the source code? Is it possible?
Michal Pıse (CTU in Prague) Object Programming Lect. 12: Reflection and MetadataDecember 14, 2010 10 / 10
