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Plist.cpp

// ---------------------------------------------------------------------------
// - Plist.cpp                                                               -
// - standard object library - property list class implementation            -
// ---------------------------------------------------------------------------
// - This program is free software;  you can redistribute it  and/or  modify -
// - it provided that this copyright notice is kept intact.                  -
// -                                                                         -
// - This program  is  distributed in  the hope  that it will be useful, but -
// - without  any  warranty;  without  even   the   implied    warranty   of -
// - merchantability or fitness for a particular purpose.  In no event shall -
// - the copyright holder be liable for any  direct, indirect, incidental or -
// - special damages arising in any way out of the use of this software.     -
// ---------------------------------------------------------------------------
// - copyright (c) 2005-2007 amaury darsch                                   -
// ---------------------------------------------------------------------------

#include "Plist.hpp"
#include "Input.hpp"
#include "Stdsid.hxx"
#include "Vector.hpp"
#include "Output.hpp"
#include "Utility.hpp"
#include "Integer.hpp"
#include "Boolean.hpp"
#include "Runnable.hpp"
#include "QuarkZone.hpp"
#include "Exception.hpp"

namespace afnix {

  // -------------------------------------------------------------------------
  // - class section                                                         -
  // -------------------------------------------------------------------------

  // create a new empty plist

00037   Plist::Plist (void) {
    reset ();
  }

  // destroy this set

00043   Plist::~Plist (void) {
    reset ();
  }

  // return the class name

00049   String Plist::repr (void) const {
    return "Plist";
  }

  // make this plist a shared object

00055   void Plist::mksho (void) {
    if (p_shared != nilp) return;
    Object::mksho ();
    d_plist.mksho ();
    d_phash.mksho ();
  }

  // return the plist serial code

00064   t_byte Plist::serialid (void) const {
    return SERIAL_PLST_ID;
  }

  // serialize this plist

00070   void Plist::wrstream (Output& os) const {
    rdlock ();
    try {
      d_plist.wrstream (os);
      unlock ();
    } catch (...) {
      unlock ();
      throw;
    }
  }

  // deserialize this plist

00083   void Plist::rdstream (Input& is) {
    wrlock ();
    try {
      // reset and read the vector
      reset  ();
      d_plist.rdstream (is);
      // update the hash table
      long len = d_plist.length ();
      for (long i = 0; i < len; i++) {
      Property* prop = dynamic_cast <Property*> (d_plist.get (i));
      if (prop == nilp) {
        throw Exception ("internal-error", 
                     "invalid nil property whie deserializing");
      }
      String name = prop->getname ();
      d_phash.add (name, prop);
      }
      unlock ();
    } catch (...) {
      unlock ();
      throw;
    }
  }

  // reset this plist

00109   void Plist::reset (void) {
    wrlock ();
    d_plist.reset ();
    d_phash.reset ();
    unlock ();
  }

  // return the length of this plist

00118   long Plist::length (void) const {
    rdlock ();
    long result = d_plist.length ();
    unlock ();
    return result;
  }

  // get a property object by index

00127   Property* Plist::get (const long index) const {
    rdlock ();
    try {
      Property* result = dynamic_cast <Property*> (d_plist.get (index));
      unlock ();
      return result;
    } catch (...) {
      unlock ();
      throw;
    }
  }

  // get a property by name

00141   Property* Plist::find (const String& name) const {
    rdlock ();
    try {
      Property* result = dynamic_cast <Property*> (d_phash.get (name));
      unlock ();
      return result;
    } catch (...) {
      unlock ();
      throw;
    }
  }

  // get a property by name or throw an exception

00155   Property* Plist::lookup (const String& name) const {
    rdlock ();
    try {
      Property* result = dynamic_cast <Property*> (d_phash.lookup (name));
      unlock ();
      return result;
    } catch (...) {
      unlock ();
      throw;
    }
  }

  // get a property value by name

00169   String Plist::getpval (const String& name) const {
    rdlock ();
    try {
      Property* prop = lookup (name);
      String result = prop->getpval ();
      unlock ();
      return result;
    } catch (...) {
      unlock ();
      throw;
    }
  }

  // return true if a property exists by name

00184   bool Plist::exists (const String& name) const {
    rdlock ();
    bool result = d_phash.exists (name);
    unlock ();
    return result;
  }

  // add a property to this plist

00193   void Plist::add (Property* prop) {
    if (prop == nilp) return;
    wrlock ();
    try {
      // get the propery name
      String name = prop->getname ();
      // check if the property alreay exists
      if (exists (name) == true) {
      unlock ();
      throw Exception ("plist-error", "propety already exists", name);
      }
      // add the property in the list
      d_plist.append (prop);
      // add the property in the hash
      d_phash.add (name, prop);
      // done
      unlock ();
    } catch (...) {
      unlock ();
      throw;
    }
  }

  // add a property by name and value

00218   void Plist::add (const String& name, const Literal& lval) {
    wrlock ();
    Property* prop = new Property (name, lval);
    try {
      add (prop);
      unlock ();
    } catch (...) {
      delete prop;
      unlock ();
      throw;
    }
  }

  // set a property by name and value

00233   void Plist::set (const String& name, const Literal& lval) {
    wrlock ();
    try {
      if (exists (name) == true) {
      Property* prop = lookup (name);
      prop->setpval (lval);
      } else {
      add (name, lval);
      }
      unlock ();
    } catch (...) {
      unlock ();
      throw;
    }
  }

  // return a plist iterator

00251   Iterator* Plist::makeit (void) {
    rdlock ();
    try {
      Plistit* it = new Plistit (this);
      unlock ();
      return it;
    } catch (...) {
      unlock ();
      throw;
    }
  }
  
  // -------------------------------------------------------------------------
  // - object section                                                        -
  // -------------------------------------------------------------------------

  // the quark zone
  static const long QUARK_ZONE_LENGTH = 8;
  static QuarkZone  zone (QUARK_ZONE_LENGTH);

  // the object supported quarks
  static const long QUARK_ADD     = zone.intern ("add");
  static const long QUARK_SET     = zone.intern ("set");
  static const long QUARK_GET     = zone.intern ("get");
  static const long QUARK_FIND    = zone.intern ("find");
  static const long QUARK_RESET   = zone.intern ("reset");
  static const long QUARK_LENGTH  = zone.intern ("length");
  static const long QUARK_LOOKUP  = zone.intern ("lookup");
  static const long QUARK_EXISTP  = zone.intern ("exists-p");
  static const long QUARK_GETPVAL = zone.intern ("get-value");

  // create a new object in a generic way

00284   Object* Plist::mknew (Vector* argv) {
    // get the number of arguments
    long argc = (argv == nilp) ? 0 : argv->length ();

    // check for 0 argument
    if (argc == 0) return new Plist;
    // too many arguments
    throw Exception ("argument-error", 
                 "too many argument with plist constructor");
  }

  // return true if the given quark is defined

00297   bool Plist::isquark (const long quark, const bool hflg) const {
    rdlock ();
    if (zone.exists (quark) == true) {
      unlock ();
      return true;
    }
    bool result = hflg ? Iterable::isquark (quark, hflg) : false;
    unlock ();
    return result;
  }
  
  // apply this object with a set of arguments and a quark

00310   Object* Plist::apply (Runnable* robj, Nameset* nset, const long quark,
                  Vector* argv) {
    // get the number of arguments
    long argc = (argv == nilp) ? 0 : argv->length ();
    
    // dispatch 0 argument
    if (argc == 0) {
      if (quark == QUARK_LENGTH) return new Integer (length ());
      if (quark == QUARK_RESET) {
      reset ();
      return nilp;
      }
    }
    
    // dispatch 1 argument
    if (argc == 1) {
      if (quark == QUARK_ADD) {
      Object* obj = argv->get (0);
      Property* prop = dynamic_cast <Property*> (obj);
      if ((obj != nilp) && (prop == nilp)) {
        throw Exception ("type-error", "invalid object with add",
                     Object::repr (obj));
      }
      add (prop);
      return nilp;
      }
      if (quark == QUARK_FIND) {
      rdlock ();
      try {
        String name = argv->getstring (0);
        Object* result = find (name);
        robj->post (result);
        unlock ();
        return result;
      } catch (...) {
        unlock ();
        throw;
      }
      }
      if (quark == QUARK_LOOKUP) {
      rdlock ();
      try {
        String name = argv->getstring (0);
        Object* result = find (name);
        robj->post (result);
        unlock ();
        return result;
      } catch (...) {
        unlock ();
        throw;
      }
      }
      if (quark == QUARK_EXISTP) {
      String name = argv->getstring (0);
      return new Boolean (exists (name));
      }
      if (quark == QUARK_GETPVAL) {
      String name = argv->getstring (0);
      return new String (getpval (name));
      }
      if (quark == QUARK_GET) {
      long index = argv->getint (0);
      rdlock();
      try {
        Object* result = get (index);
        robj->post (result);
        unlock ();          
        return result;
      } catch (...) {
        unlock ();
        throw;
      }
      }
    }

    // dispatch 2 arguments
    if (argc == 2) {
      if (quark == QUARK_ADD) {
      String   name = argv->getstring (0);
      Object*   obj = argv->get (1);
      Literal* lobj = dynamic_cast <Literal*> (obj);
      if (lobj == nilp) {
      throw Exception ("type-error", "invalid object with add",
                   Object::repr (obj));
      }
      add (name, *lobj);
      return nilp;
      }
      if (quark == QUARK_SET) {
      String   name = argv->getstring (0);
      Object*   obj = argv->get (1);
      Literal* lobj = dynamic_cast <Literal*> (obj);
      if (lobj == nilp) {
      throw Exception ("type-error", "invalid object with set",
                   Object::repr (obj));
      }
      set (name, *lobj);
      return nilp;
      }
    }
    // call the iterable method
    return Iterable::apply (robj, nset, quark, argv);
  }

  // -------------------------------------------------------------------------
  // - iterator section                                                      -
  // -------------------------------------------------------------------------

  // create a new set iterator

00420   Plistit::Plistit (Plist* plist) {
    Object::iref (p_plist = plist);
    if (p_plist != nilp) p_plist->rdlock ();
    d_idx = 0;
    begin ();
  }

  // destroy this set iterator

00429   Plistit::~Plistit (void) {
    if (p_plist != nilp) p_plist->unlock ();
    Object::dref (p_plist);
  }

  // return the class name

00436   String Plistit::repr (void) const {
    return "Plistit";
  }

  // make this set iterator a shared object

00442   void Plistit::mksho (void) {
    if (p_shared != nilp) return;
    Object::mksho ();
    if (p_plist != nilp) p_plist->mksho ();
  }

  // reset the iterator to the begining

00450   void Plistit::begin (void) {
    wrlock ();
    if (p_plist != nilp) {
      d_idx = 0;
    }
    unlock ();
  }

  // reset the iterator to the end

00460   void Plistit::end (void) {
    wrlock ();
    if (p_plist != nilp) {
      long plen = p_plist->length ();
      d_idx = (plen == 0) ? 0 : plen - 1;
    }
    unlock ();
  }

  // go to the next object

00471   void Plistit::next (void) {
    wrlock ();
    if (p_plist != nilp) {
      long plen = p_plist->length ();      
      if (++d_idx >= plen) d_idx = plen;
    }
    unlock ();
  }

  // go to the previous object
00481   void Plistit::prev (void) {
    wrlock ();
    if (--d_idx < 0) d_idx = 0;
    unlock ();
  }

  // get the object at the current position

00489   Object* Plistit::getobj (void) const {
    rdlock ();
    try {
      Object* result = (p_plist == nilp) ? nilp : p_plist->get (d_idx);
      unlock ();
      return result;
    } catch (...) {
      unlock ();
      throw;
    }
  }

  // return true if the iterator is at the end

00503   bool Plistit::isend (void) {
    rdlock ();
    bool result = false;
    if (p_plist != nilp) {
      long plen = p_plist->length ();            
      result = (d_idx >= plen);
    }
    unlock ();
    return result;
  }
}

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