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java.lang.Object
   |
   +----edu.utah.janos.antsr.core.Entity

Summary

public abstract class  Entity
     extends java.lang.Object
{
          // Fields 3
     protected int[] L;
     private static final String[] defaults;
     private String name;

          // Constructors 2
     Entity();
     Entity(String);

          // Methods 8
     String getName();
     protected void log(int, String);
     void setArgs(KeyArgs) throws InvalidKeyArgsException;
     void setArgs(String[]) throws InvalidKeyArgsException;
     void setArgs(String[], int) throws InvalidKeyArgsException;
     void setName(String);
     public String toString();
     String usage();
}

An Entity is an abstract class from which all Node-resident "things" are subclassed. For example, applications, channels, extensions and the node interface are all Entities.

Every entity has a name.

Every entity has a set of "arguments" it understands. These arguments are represented as string pairs: an argument name and argument value. Each subclass of entity can define its own arguments and their default values. At this level, the only argument is '-log' (defaults to '0'.)

Author:

David Wetherall

See Also: utils.KeyArgs

Cross Reference

Extended By:

Application, Extension

   private static final String[] defaults

Default arguments that are handled at the Entity level.

All subclasses should follow this pattern: a public final static String[] named defaults so that, via reflection, usage information can be obtained in a generic manner.

Subclasses should explicitly set the defaults to null.

See Also: setArgs

   private String name

Name of this entity.

   protected int[] L

Note: L is deprecated — Use the Janos I/O Logging levels instead.

Constructors

· Entity

Summary  |  Top

   Entity() 

No-argument constructor for Entities created through Class.newInstance(). Results in an unnamed entity.

Name must be set through setName();

   Entity(String name) 

Construct a named Entity.

   String getName() 

   void setName(String name) 

   String usage() 

   void setArgs(String[] ka)  throws InvalidKeyArgsException

Set this Entity's arguments to the given array of strings. The array must contain an even number of Strings (i.e., a whole number of pairs).

Subclasses should override the setArgs(utils.KeyArgs) version of this method if they want to handle their own arguments.

Parameter	Description
ka	the array of String arguments.

Throws: Exception

if there are unused arguments

   void setArgs(String[] ka, 
                int sk)  throws InvalidKeyArgsException

Set this Entity's arguments to the given array of strings. The array must contain an even number of Strings (i.e., a whole number of pairs). Start at index 'sk', ignoring previous entries in the array.

Subclasses should override the setArgs(utils.KeyArgs) version of this method if they want to handle their own arguments.

Parameter	Description
ka	the array of String arguments.
sk	the start key in the array.

Throws: Exception

if there are unused arguments

   void setArgs(KeyArgs k)  throws InvalidKeyArgsException

Set this Entity's arguments to the those specified in k. Default arguments are overriden if specified in k.

Since this is the last place that handles KeyArgs, if the there are any remaining arguments, an exception is thrown. Subclasses of Entity must 'strike()' any KeyArgs they consume before invoking this method.

Parameter	Description
k	the arguments to use.

Throws: Exception

if there are extra arguments in k

See Also: utils.KeyArgs, logLevel

   protected void log(int level, 
                      String msg) 

Note: log() is deprecated — Use node.log() for real logging. Use TRACE macros for debugging.

   public String toString() 

Overrides:

toString in class Object

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