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Author: Roquen (posted 2012-07-19 10:36:30, viewed 307 times)

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package entity;

abstract class UserVar
{
  // NOTE: Could add an enum TYPE to allow asking the active type of
  // a given variable. 
  
  abstract int    getInt();
  abstract float  getFloat();
  abstract String getString();
  abstract Entity getEntity();

  // Sentinel for non-existent variables
  public static final UserVar NILL = new UserVar()
  {
    @Override final int    getInt()    { return 0; }
    @Override final float  getFloat()  { return 0; }
    @Override final String getString() { return ""; }
    @Override final Entity getEntity() { return Entity.NILL; }
  };
  
  // NOTE: Could easily be a double instead. Given small object size padding
  // it's likely wouldn't even increase memory footprint.
  static final class FLOAT extends UserVar
  {
    float value;

    FLOAT(float v) { value = v; }

    @Override final int    getInt()    { return (int)value; }
    @Override final float  getFloat()  { return value; }
    @Override final String getString() { return String.valueOf(value); }
    @Override final Entity getEntity() { return Entity.NILL; }
  }

  // NOTE: Could easily be a long instead. Given small object size padding
  // it's likely wouldn't even increase memory footprint.
  static final class INT extends UserVar
  {
    int value;

    INT(int v) { value = v; }

    @Override final int    getInt()    { return value; }
    @Override final float  getFloat()  { return value; }
    @Override final String getString() { return String.valueOf(value); }
    @Override final Entity getEntity() { return Entity.NILL; } // could lookup UID if used
  }

  static final class STRING extends UserVar
  {
    String value;

    STRING(String v) { value = v; }

    @Override final int    getInt()    { return 0; }  // parsing would be better
    @Override final float  getFloat()  { return 0; }  // paring would be better
    @Override final String getString() { return value; }
    @Override final Entity getEntity() { return Entity.NILL; } // could look up tag
  }

  static final class ENTITY extends UserVar
  {
    Entity value;

    ENTITY(Entity v) { value = v; }

    @Override final int    getInt()    { return 0; }  // or UID if used
    @Override final float  getFloat()  { return 0; }  // ditto as int
    @Override final String getString() { return ""; } // or something else
    @Override final Entity getEntity() { return value; }
  }
}





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