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//
// statein.h
//
// Copyright (C) 1998 Limit Point Systems, Inc.
//
// Author: Curtis Janssen <cljanss@limitpt.com>
// Maintainer: LPS
//
// This file is part of the SC Toolkit.
//
// The SC Toolkit is free software; you can redistribute it and/or modify
// it under the terms of the GNU Library General Public License as published by
// the Free Software Foundation; either version 2, or (at your option)
// any later version.
//
// The SC Toolkit 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.  See the
// GNU Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public License
// along with the SC Toolkit; see the file COPYING.LIB.  If not, write to
// the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
//
// The U.S. Government is granted a limited license as per AL 91-7.
//

#ifndef _util_state_statein_h
#define _util_state_statein_h

#ifdef __GNUC__
#pragma interface
#endif

#include <string>
#include <vector>
#include <map>

#include <util/state/state.h>
#include <util/keyval/keyval.h>

namespace sc {

class StateInData {
  public:
    Ref<SavableState> ptr;
    int size;
    int type;
    int offset;

    StateInData(): size(0), type(0), offset(0) {}
};

class StateClassData {
  public:
    int version;
    char *name;
    const ClassDesc *classdesc;
    int ninstance;
  public:
    StateClassData(int v=-1, const ClassDesc *c=0, char *name=0):
      version(v), name(name), classdesc(c), ninstance(0) {}
    StateClassData(const StateClassData &d) { operator=(d); }
    ~StateClassData();
    StateClassData &operator=(const StateClassData &d);
};

/** Restores objects that derive from SavableState.
 */
class StateIn:  public DescribedClass {
    friend class SavableState;
    friend class TranslateDataIn;
  private:
    // do not allow copy constructor or assignment
    StateIn(const StateIn&);
    void operator=(const StateIn&);
    int have_cd_;
    int dir_loc_;
    char key_[KeyVal::MaxKeywordLength];
    int keylength_;
  protected:
    Ref<KeyVal> override_;
    TranslateDataIn *translate_;
    std::map<int,StateInData> ps_;
    int expected_object_num_;
    std::map<ClassDescP,int> classidmap_;
    std::map<int,StateClassData> classdatamap_;
    int nextclassid_;
    int node_to_node_;
    int version_;
    int date_;
    char userid_[9];
    char format_;
    virtual int get_array_void(void*,int);

    int push_key(const char *key);
    void pop_key(int n) { key_[n] = '\0'; keylength_ = n; }
    const char *key() { return key_; }

    void get_directory();
    int directory_location() const { return dir_loc_; }
    void find_and_get_directory();

    // The following members are called by friend SavableState

    /** This is used to restore an object.  It is called with the
        reference to the reference being restored.  If the data being
        restored has previously been restored, then the pointer
        being restored is set to a reference to the previously
        restored object. */
    virtual int getobject(Ref<SavableState> &);

    /// This restores objects that are listed in the directory.
    virtual int dir_getobject(Ref<SavableState> &, const char *name);

    /** When storage has been allocated during object restoration,
        this routine is called with the object reference number
        and the pointer to the new storage so getpointer
        can find the data if it is referenced again. */
    virtual void haveobject(int,const Ref<SavableState> &);

    /** A call to nextobject followed by havepointer(int) is equiv
        to havepointer(int,void**); */
    virtual void nextobject(int);
    virtual void haveobject(const Ref<SavableState> &);

    void have_classdesc() { have_cd_ = 1; }
    int need_classdesc() { int tmp = have_cd_; have_cd_ = 0; return !tmp; }

    /** This restores ClassDesc's.  It will set the
        pointer to the address of the static ClassDesc for
        the class which has the same name as the class that had
        the ClassDesc that was saved by put(const ClassDesc*). */
    virtual int get(const ClassDesc**);
  public:
    StateIn();
    virtual ~StateIn();

    /** Read in the header information.  Changes the translation
        scheme if necessary. */
    virtual void get_header();

    /** Returns the version of the ClassDesc in the persistent object
        or -1 if info on the ClassDesc doesn't exist. */
    virtual int version(const ClassDesc*);
    
    /// This restores strings saved with StateOut::putstring.
    virtual int getstring(char*&);
    
    /// This restores a std::string object.
    virtual int get(std::string&);

    /// These restore data saved with StateOut's put.  members.
    virtual int get(char&r, const char *keyword = 0);
    virtual int get(unsigned int&r, const char *keyword = 0);
    virtual int get(int&r, const char *keyword = 0);
    virtual int get(bool&r, const char *keyword = 0);
    virtual int get(float&r, const char *keyword = 0);
    virtual int get(double&r, const char *keyword = 0);
    /** These restore data saved with StateOut's put.
        members.  The data is allocated by StateIn. */
    virtual int get(char*&);
    virtual int get(unsigned int*&);
    virtual int get(int*&);
    virtual int get(float*&);
    virtual int get(double*&);
    /** These restore data saved with StateOut's put.
        members.  The data must be preallocated by the user. */
    virtual int get_array_char(char*p,int size);
    virtual int get_array_uint(unsigned int*p,int size);
    virtual int get_array_int(int*p,int size);
    virtual int get_array_float(float*p,int size);
    virtual int get_array_double(double*p,int size);

    /// Read an STL vector of data.
    template <class T>
    int get(typename std::vector<T> &v) {
      int l;
      int r = get(l);
      if (l) { v.resize(l); for (int i=0; i<l; i++) r += get(v[i]); }
      return r;
    }

    /** True if this is a node to node save/restore.  This is
        for classes that try to avoid saving databases
        to files that can otherwise be read in, but want to avoid
        reading the database from disk on all nodes. */
    int node_to_node() const { return node_to_node_; }

    /// Returns true of this object uses a directory.
    virtual int use_directory();

    /// Return the current position in the file.
    virtual int tell();
    /** Set the current position in the file.  The default implementation
        does nothing. */
    virtual void seek(int);
    /** Return non-zero if seek does anything sensible.  The
        default implementation returns 0. */
    virtual int seekable();
    int has_directory() const { return dir_loc_ != 0; }

    /** List all the objects to the stream.  Only StateIn
        specializations with directories can list objects. */
    virtual void list_objects(std::ostream& = ExEnv::out0());

    /** Give this StateIn a KeyVal object
        that is used to override values. */
    void set_override(const Ref<KeyVal>&kv) { override_ = kv; }
    /** Return the KeyVal used to override values. */
    const Ref<KeyVal> &override() const { return override_; }
  };

}

#endif

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