SerializableJsonFile.cpp

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/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * Written (W) 2010 Soeren Sonnenburg
 * Copyright (C) 2010 Berlin Institute of Technology
 */

#include <shogun/lib/config.h>
#ifdef HAVE_JSON

#include <shogun/io/SerializableJsonFile.h>
#include <shogun/io/SerializableJsonReader00.h>

#define STR_KEY_FILETYPE           "filetype"
#define STR_FILETYPE_00 \
    "_SHOGUN_SERIALIZABLE_JSON_FILE_V_00_"

using namespace shogun;

CSerializableJsonFile::CSerializableJsonFile()
    :CSerializableFile() { init(""); }

CSerializableJsonFile::CSerializableJsonFile(const char* fname, char rw)
    :CSerializableFile()
{
    CSerializableFile::init(NULL, rw, fname);
    init(fname);
}

CSerializableJsonFile::~CSerializableJsonFile()
{
    close();
}

CSerializableFile::TSerializableReader*
CSerializableJsonFile::new_reader(char* dest_version, size_t n)
{
    const char* ftype;
    json_object* buf;

    if ((buf = json_object_object_get(
             m_stack_stream.back(), STR_KEY_FILETYPE)) == NULL
        || is_error(buf)
        || (ftype = json_object_get_string(buf)) == NULL)
        return NULL;

    strncpy(dest_version, ftype, n);

    if (strcmp(STR_FILETYPE_00, dest_version) == 0)
        return new SerializableJsonReader00(this);

    return NULL;
}

void
CSerializableJsonFile::push_object(json_object* o)
{ m_stack_stream.push_back(o); json_object_get(o); }

void
CSerializableJsonFile::pop_object()
{ json_object_put(m_stack_stream.back()); m_stack_stream.pop_back(); }

bool
CSerializableJsonFile::get_object_any(
    json_object** dest, json_object* src, const char* key)
{
    *dest = json_object_object_get(src, key);

    return !is_error(*dest);
}

bool
CSerializableJsonFile::get_object(json_object** dest, json_object* src,
                                  const char* key, json_type t)
{
    *dest = json_object_object_get(src, key);

    return *dest != NULL && !is_error(*dest)
        && json_object_is_type(*dest, t);
}

void
CSerializableJsonFile::init(const char* fname)
{
    if (m_filename == NULL || *m_filename == '\0') {
        SG_WARNING("Filename not given for opening file!\n");
        close(); return;
    }

    json_object* buf;
    switch (m_task) {
    case 'r':
        buf = json_object_from_file((char*) fname);
        if (is_error(buf)) {
            SG_WARNING("Could not open file `%s' for reading!\n",
                       fname);
            return;
        }
        push_object(buf);
        break;
    case 'w':
        push_object(json_object_new_object());

        buf = json_object_new_string(STR_FILETYPE_00);
        json_object_object_add(m_stack_stream.back(),
                               STR_KEY_FILETYPE, buf);
        break;
    default:
        SG_WARNING("Could not open file `%s', unknown mode!\n",
                   m_filename);
        close(); return;
    }
}

void
CSerializableJsonFile::close()
{
    while (m_stack_stream.get_num_elements() > 1)
        pop_object();

    if (m_stack_stream.get_num_elements() == 1) {
        if (m_task == 'w'
            && is_error(
                json_object_to_file(m_filename, m_stack_stream.back())
                )) {
            SG_WARNING("Could not close file `%s' for writing!\n",
                       m_filename);
        }

        pop_object();
    }
}

bool
CSerializableJsonFile::is_opened()
{
    return m_stack_stream.get_num_elements() > 0;
}

bool
CSerializableJsonFile::write_scalar_wrapped(
    const TSGDataType* type, const void* param)
{
    switch (type->m_ptype) {
    case PT_BOOL:
        push_object(json_object_new_boolean(*(bool*) param));
        break;
    case PT_CHAR:
        push_object(json_object_new_int((int) *(char*) param));
        break;
    case PT_INT8:
        push_object(json_object_new_int((int) *(int8_t*) param));
        break;
    case PT_UINT8:
        push_object(json_object_new_int((int) *(uint8_t*) param));
        break;
    case PT_INT16:
        push_object(json_object_new_int((int) *(int16_t*) param));
        break;
    case PT_UINT16:
        push_object(json_object_new_int((int) *(uint16_t*) param));
        break;
    case PT_INT32:
        push_object(json_object_new_int((int) *(int32_t*) param));
        break;
    case PT_UINT32:
        push_object(json_object_new_int((int) *(uint32_t*) param));
        break;
    case PT_INT64:
        push_object(json_object_new_int((int) *(int64_t*) param));
        break;
    case PT_UINT64:
        push_object(json_object_new_int((int) *(uint64_t*) param));
        break;
    case PT_FLOAT32:
        push_object(json_object_new_double(
                        (double) *(float32_t*) param));
        break;
    case PT_FLOAT64:
        push_object(json_object_new_double(
                        (double) *(float64_t*) param));
        break;
    case PT_FLOATMAX:
        push_object(json_object_new_double(
                        (double) *(floatmax_t*) param));
        break;
    case PT_SGOBJECT:
        SG_ERROR("write_scalar_wrapped(): Implementation error during"
                 " writing JsonFile!");
        return false;
    }

    if (is_error(m_stack_stream.back())) return false;

    return true;
}

bool
CSerializableJsonFile::write_cont_begin_wrapped(
    const TSGDataType* type, index_t len_real_y, index_t len_real_x)
{
    push_object(json_object_new_array());

    for (index_t i=0; i<len_real_x && (type->m_ctype==CT_MATRIX || type->m_ctype==CT_SGMATRIX); i++)
        json_object_array_add(m_stack_stream.back(),
                              json_object_new_array());

    return true;
}

bool
CSerializableJsonFile::write_cont_end_wrapped(
    const TSGDataType* type, index_t len_real_y, index_t len_real_x)
{
    return true;
}

bool
CSerializableJsonFile::write_string_begin_wrapped(
    const TSGDataType* type, index_t length)
{
    push_object(json_object_new_array());

    return true;
}

bool
CSerializableJsonFile::write_string_end_wrapped(
    const TSGDataType* type, index_t length)
{
    return true;
}

bool
CSerializableJsonFile::write_stringentry_begin_wrapped(
    const TSGDataType* type, index_t y)
{
    return true;
}

bool
CSerializableJsonFile::write_stringentry_end_wrapped(
    const TSGDataType* type, index_t y)
{
    json_object* array = m_stack_stream.get_element(
        m_stack_stream.get_num_elements() - 2);

    if (is_error(json_object_array_put_idx(
                     array, y, m_stack_stream.back()))) return false;

    pop_object();
    return true;
}

bool
CSerializableJsonFile::write_sparse_begin_wrapped(
    const TSGDataType* type, index_t length)
{
    push_object(json_object_new_object());

    json_object* buf = json_object_new_array();
    if (is_error(buf)) return false;
    json_object_object_add(m_stack_stream.back(),
            STR_KEY_SPARSE_FEATURES, buf);

    push_object(buf);
    return true;
}

bool
CSerializableJsonFile::write_sparse_end_wrapped(
    const TSGDataType* type, index_t length)
{
    pop_object();
    return true;
}

bool
CSerializableJsonFile::write_sparseentry_begin_wrapped(
    const TSGDataType* type, const SGSparseVectorEntry<char>* first_entry,
    index_t feat_index, index_t y)
{
    json_object* buf = json_object_new_object();
    if (is_error(json_object_array_put_idx(m_stack_stream.back(), y,
                                           buf))) return false;
    push_object(buf);

    buf = json_object_new_int(feat_index);
    if (is_error(buf)) return false;
    json_object_object_add(m_stack_stream.back(),
                           STR_KEY_SPARSE_FEATINDEX, buf);

    return true;
}

bool
CSerializableJsonFile::write_sparseentry_end_wrapped(
    const TSGDataType* type, const SGSparseVectorEntry<char>* first_entry,
    index_t feat_index, index_t y)
{
    json_object* o = m_stack_stream.get_element(
        m_stack_stream.get_num_elements() - 2);

    json_object_object_add(o, STR_KEY_SPARSE_ENTRY,
                           m_stack_stream.back());

    pop_object(); pop_object();
    return true;
}

bool
CSerializableJsonFile::write_item_begin_wrapped(
    const TSGDataType* type, index_t y, index_t x)
{
    return true;
}

bool
CSerializableJsonFile::write_item_end_wrapped(
    const TSGDataType* type, index_t y, index_t x)
{
    json_object* array = m_stack_stream.get_element(
        m_stack_stream.get_num_elements() - 2);

    if (type->m_ctype==CT_MATRIX || type->m_ctype==CT_SGMATRIX)
        array = json_object_array_get_idx(array, x);

    json_object_array_put_idx(array, y, m_stack_stream.back());

    pop_object();
    return true;
}

bool
CSerializableJsonFile::write_sgserializable_begin_wrapped(
    const TSGDataType* type, const char* sgserializable_name,
    EPrimitiveType generic)
{
    if (*sgserializable_name == '\0') {
        push_object(NULL); return true;
    }

    push_object(json_object_new_object());

    json_object* buf;
    buf = json_object_new_string(sgserializable_name);
    if (is_error(buf)) return false;
    json_object_object_add(m_stack_stream.back(),
                           STR_KEY_INSTANCE_NAME, buf);

    if (generic != PT_NOT_GENERIC) {
        string_t buf_str;
        TSGDataType::ptype_to_string(buf_str, generic, STRING_LEN);
        buf = json_object_new_string(buf_str);
        if (is_error(buf)) return false;
        json_object_object_add(m_stack_stream.back(),
                               STR_KEY_GENERIC_NAME, buf);
    }

    buf = json_object_new_object();
    if (is_error(buf)) return false;
    json_object_object_add(m_stack_stream.back(), STR_KEY_INSTANCE,
                           buf);
    push_object(buf);

    return true;
}

bool
CSerializableJsonFile::write_sgserializable_end_wrapped(
    const TSGDataType* type, const char* sgserializable_name,
    EPrimitiveType generic)
{
    if (*sgserializable_name == '\0') return true;

    pop_object();
    return true;
}

bool
CSerializableJsonFile::write_type_begin_wrapped(
    const TSGDataType* type, const char* name, const char* prefix)
{
    json_object* buf = json_object_new_object();
    if (is_error(buf)) return false;

    json_object_object_add(m_stack_stream.back(), name, buf);
    push_object(buf);

    string_t str_buf;
    type->to_string(str_buf, STRING_LEN);
    buf = json_object_new_string(str_buf);
    if (is_error(buf)) return false;
    json_object_object_add(m_stack_stream.back(), STR_KEY_TYPE, buf);

    return true;
}

bool
CSerializableJsonFile::write_type_end_wrapped(
    const TSGDataType* type, const char* name, const char* prefix)
{
    json_object_object_add(
        m_stack_stream.get_element(
            m_stack_stream.get_num_elements() - 2), STR_KEY_DATA,
        m_stack_stream.back());
    pop_object();

    pop_object();
    return true;
}

#endif /* HAVE_JSON  */