// file: $isip/class/asr/Anchor/Anchor.h
// version: $Id: Anchor.h 8665 2002-09-01 18:42:02Z alphonso $
//

// make sure definitions are only made once
//
#ifndef ISIP_ANCHOR
#define ISIP_ANCHOR

#ifndef ISIP_STRING
#include <String.h>
#endif

#ifndef ISIP_BOOLEAN
#include <Boolean.h>
#endif

#ifndef ISIP_HASH_TABLE
#include <HashTable.h>
#endif

#ifndef ISIP_DOUBLE_LINKED_LIST
#include <DoubleLinkedList.h>
#endif

// Anchor: a class used to represent time offsets in the annotation graph
//
// Reference:
//
// [1] S. Bird, M. Liberman, A Formal Framework for Linguistic Annotation,
// Linguistic Data Consortium, University of Pennsylvania, Philadelphia,
// Pennsylvania, USA, 2000.
//
// [2] K. Maeda, X. Ma, H. Lee, S. Bird, The Annotation Graph Toolkit:
// Application Developer's Manual (Draft), Linguistic Data Consortium,
// University of Pennsylvania, Philadelphia, Pennsylvania, USA, 2001.
//
class Anchor {
  
  //--------------------------------------------------------------------------
  //
  // public constants
  //
  //--------------------------------------------------------------------------
public:
  
  // define the class name
  //
  static const String CLASS_NAME;

  // i/o related constants
  //
  static const String DEF_PARAM;
  static const String PARAM_ID;
  static const String PARAM_OFFSET;
  static const String PARAM_UNIT;  
  static const String PARAM_ANCHORED;
  
  //---------------------------------------------------------------------------
  //
  // protected data
  //
  //---------------------------------------------------------------------------
  protected:

  // declare the anchor id
  //
  String id_d;

  // declare the anchor offset
  //
  Float offset_d;
  
  // declare the anchor time unit
  //
  String unit_d;

  // declare a flag that indicates if the anchor is anchored
  //
  Boolean anchored_d;
  
  // declare a static debug level for all class instantiations
  //
  static Integral::DEBUG debug_level_d;
  
  // a static memory manager
  //
  static MemoryManager mgr_d;
  
  //---------------------------------------------------------------------------
  //
  // required public methods
  //
  //---------------------------------------------------------------------------
public:
  
  // method: name
  //
  static const String& name() {
    return CLASS_NAME;
  }
  
  static boolean diagnose(Integral::DEBUG debug_level);
  
  // debug methods
  //
  boolean debug(const unichar* msg) const;

  // method: setDebug
  //
  static boolean setDebug(Integral::DEBUG arg) {
    debug_level_d = arg;
    return true;
  }
  
  // method: destructor
  //
  ~Anchor();

  // method: default constructor
  //
  Anchor();

  // method: copy constructor
  //
  Anchor(const Anchor& arg) {
    assign(arg);
  }

  // method: assign
  //
  boolean assign(const Anchor& arg);
  
  // method: sofSize
  //
  long sofSize() const {
    return (offset_d.sofSize() + unit_d.sofSize() + anchored_d.sofSize());
  }

  // method: read
  //
  boolean read(Sof& sof, long tag) {
    return read(sof, tag, name());
  }

  // other read methods
  //
  boolean read(Sof& sof, long tag, const String& name);
  boolean readData(Sof& sof, const String& pname = DEF_PARAM,
		   long size = SofParser::FULL_OBJECT, boolean param = true,
		   boolean nested = false);
  
  // method: write
  //
  boolean write(Sof& sof, long tag) const {
    return write(sof, tag, name());
  }

  // other write methods
  //  
  boolean write(Sof& sof, long tag, const String& name) const;  
  boolean writeData(Sof& sof, const String& pname =  DEF_PARAM) const;
  
  // method: eq
  //
  boolean eq(const Anchor& arg) const;

  // method: new
  //
  static void* operator new(size_t arg) {
    return mgr_d.get();
  }

  // method: new[]
  //
  static void* operator new[](size_t arg) {
    return mgr_d.getBlock(arg);
  }

  // method: delete
  //
  static void operator delete(void* arg) {
    mgr_d.release(arg);
  }

  // method: delete[]
  //
  static void operator delete[](void* arg) {
    mgr_d.releaseBlock(arg);
  }

  // method: setGrowSize
  //
  static boolean setGrowSize(long arg) {
    return mgr_d.setGrow(arg);
  }

  // method: clear
  //
  boolean clear(Integral::CMODE cmode = Integral::DEF_CMODE);
  
  //---------------------------------------------------------------------------
  //
  // class-specific public methods
  //
  //---------------------------------------------------------------------------

  // method: constructor
  //  
  Anchor(String& id, float offset, String& unit);

  // method: constructor
  //  
  Anchor(String& id, String& unit);  

  // method: constructor
  //
  Anchor(String& id, const Anchor*);

  // method: getId
  //
  const String getId() const {
    return id_d;
  }

  // method: getOffset
  //
  float getOffset() const {
    return offset_d;
  }

  // method: setOffset
  //
  boolean setOffset(float arg) {
    offset_d = arg;
    anchored_d = true;
    return true;
  }

  // method: getAnchored
  //
  boolean getAnchored() const {
    return anchored_d;
  }

  // method: setUnit
  //
  boolean setUnit(String& arg) {
    unit_d.assign(arg);
    return true;
  }
  
  // method: getUnit
  //
  String getUnit() const {
    return unit_d;
  }

  // method: unsetOffset
  //
  boolean unsetOffset() {
    anchored_d = false;
    return true;
  }
  
  //---------------------------------------------------------------------------
  //
  // private methods
  //
  //---------------------------------------------------------------------------
  private:

  // method: compare
  //
  boolean compare(const String& arg1, const String& arg2) const;
  
  // friend class
  //
  friend class AnnotationGraph;  
};

//end of include file
//
#endif
