SerializableXmlFile.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_XML

#include <shogun/io/SerializableXmlFile.h>
#include <shogun/io/SerializableXmlReader00.h>

#define STR_ROOT_NAME_00 \
    "_SHOGUN_SERIALIZABLE_XML_FILE_V_00_"

using namespace shogun;

CSerializableXmlFile::CSerializableXmlFile()
    :CSerializableFile() { init(false); }

CSerializableXmlFile::CSerializableXmlFile(const char* fname, char rw,
                                           bool format)
    :CSerializableFile()
{
    CSerializableFile::init(NULL, rw, fname);
    init(format);
}

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

CSerializableFile::TSerializableReader*
CSerializableXmlFile::new_reader(char* dest_version, size_t n)
{
    xmlChar* name;

    if ((name = xmlGetNodePath(m_stack_stream.back())) == NULL)
        return NULL;

    strncpy(dest_version, (const char*) (name+1), n);
    xmlFree(name);

    if (strcmp(STR_ROOT_NAME_00, dest_version) == 0)
        return new SerializableXmlReader00(this);

    return NULL;
}

bool
CSerializableXmlFile::push_node(const xmlChar* name)
{
    xmlNode* node
        = xmlNewChild(m_stack_stream.back(), NULL, name, NULL);

    m_stack_stream.push_back(node);

    return node != NULL;
}

bool
CSerializableXmlFile::join_node(const xmlChar* name)
{
    for (xmlNode* cur=m_stack_stream.back()->children; cur!=NULL;
         cur=cur->next) {
        if (cur->type != XML_ELEMENT_NODE
            || xmlStrcmp(cur->name, name) != 0) continue;

        m_stack_stream.push_back(cur);
        return true;
    }

    return false;
}

bool
CSerializableXmlFile::next_node(const xmlChar* name)
{
    for (xmlNode* cur=m_stack_stream.back()->next; cur!=NULL;
         cur=cur->next) {
        if (cur->type != XML_ELEMENT_NODE
            || xmlStrcmp(cur->name, name) != 0) continue;

        pop_node();
        m_stack_stream.push_back(cur);
        return true;
    }

    return false;
}

void
CSerializableXmlFile::pop_node()
{
    m_stack_stream.pop_back();
}

void
CSerializableXmlFile::init(bool format)
{
    m_format = format, m_doc = NULL;

    LIBXML_TEST_VERSION;

    if (m_filename == NULL || *m_filename == '\0') {
        SG_WARNING("Filename not given for opening file!\n");
        close(); return;
    }

    SG_DEBUG("Opening '%s'\n", m_filename);

    xmlNode* tmp;
    switch (m_task) {
    case 'r':
        if ((m_doc = xmlReadFile(m_filename, NULL, XML_PARSE_HUGE | XML_PARSE_NONET)) == NULL
            || (tmp = xmlDocGetRootElement(m_doc)) == NULL)
        {
            SG_WARNING("Could not open file `%s' for reading!\n", m_filename);
            close(); return;
        }
        m_stack_stream.push_back(tmp);
        break;
    case 'w':
        m_doc = xmlNewDoc(BAD_CAST XML_DEFAULT_VERSION);
        m_stack_stream.push_back(xmlNewNode(
                                     NULL, BAD_CAST STR_ROOT_NAME_00));
        xmlDocSetRootElement(m_doc, m_stack_stream.back());
        break;
    default:
        SG_WARNING("Could not open file `%s', unknown mode!\n",
                   m_filename);
        close(); return;
    }
}

void
CSerializableXmlFile::close()
{
    while (m_stack_stream.get_num_elements() > 0) pop_node();

    if (is_opened()) {
        if (m_task == 'w'
            &&  xmlSaveFormatFileEnc(m_filename, m_doc, "UTF-8",
                                     m_format) < 0) {
            SG_WARNING("Could not close file `%s' for writing!\n",
                       m_filename);
        }

        xmlFreeDoc(m_doc); m_doc = NULL;
        xmlCleanupParser();
    }
}

bool
CSerializableXmlFile::is_opened()
{
    return m_doc != NULL;
}

bool
CSerializableXmlFile::write_scalar_wrapped(
    const TSGDataType* type, const void* param)
{
    string_t buf;

    switch (type->m_ptype) {
    case PT_BOOL:
        if (snprintf(buf, STRING_LEN, "%s", *(bool*) param? STR_TRUE
                     : STR_FALSE) <= 0) return false;
        break;
    case PT_CHAR:
        if (snprintf(buf, STRING_LEN, "%c", *(char*) param
                ) <= 0) return false;
        break;
    case PT_INT8:
        if (snprintf(buf, STRING_LEN, "%"PRIi8, *(int8_t*) param
                ) <= 0) return false;
        break;
    case PT_UINT8:
        if (snprintf(buf, STRING_LEN, "%"PRIu8, *(uint8_t*) param
                ) <= 0) return false;
        break;
    case PT_INT16:
        if (snprintf(buf, STRING_LEN, "%"PRIi16, *(int16_t*) param
                ) <= 0) return false;
        break;
    case PT_UINT16:
        if (snprintf(buf, STRING_LEN, "%"PRIu16, *(uint16_t*) param
                ) <= 0) return false;
        break;
    case PT_INT32:
        if (snprintf(buf, STRING_LEN, "%"PRIi32, *(int32_t*) param
                ) <= 0) return false;
        break;
    case PT_UINT32:
        if (snprintf(buf, STRING_LEN, "%"PRIu32, *(uint32_t*) param
                ) <= 0) return false;
        break;
    case PT_INT64:
        if (snprintf(buf, STRING_LEN, "%"PRIi64, *(int64_t*) param
                ) <= 0) return false;
        break;
    case PT_UINT64:
        if (snprintf(buf, STRING_LEN, "%"PRIu64, *(uint64_t*) param
                ) <= 0) return false;
        break;
    case PT_FLOAT32:
        if (snprintf(buf, STRING_LEN, "%.16g", *(float32_t*) param
                ) <= 0) return false;
        break;
    case PT_FLOAT64:
        if (snprintf(buf, STRING_LEN, "%.16lg", *(float64_t*) param
                ) <= 0) return false;
        break;
    case PT_FLOATMAX:
        if (snprintf(buf, STRING_LEN, "%.16Lg", *(floatmax_t*)
                     param) <= 0) return false;
        break;
    case PT_SGOBJECT:
        SG_ERROR("write_scalar_wrapped(): Implementation error during"
                 " writing XmlFile!");
        return false;
    }

    xmlNodeAddContent(m_stack_stream.back(), BAD_CAST buf);
    return true;
}

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

bool
CSerializableXmlFile::write_cont_end_wrapped(
    const TSGDataType* type, index_t len_real_y, index_t len_real_x)
{
    if (type->m_ctype==CT_MATRIX || type->m_ctype==CT_SGMATRIX)
        if (len_real_y*len_real_x>0)
            pop_node();

    return true;
}

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

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

bool
CSerializableXmlFile::write_stringentry_begin_wrapped(
    const TSGDataType* type, index_t y)
{
    if (!push_node(BAD_CAST STR_STRING)) return false;

    return true;
}

bool
CSerializableXmlFile::write_stringentry_end_wrapped(
    const TSGDataType* type, index_t y)
{
    pop_node();

    return true;
}

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

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

bool
CSerializableXmlFile::write_sparseentry_begin_wrapped(
    const TSGDataType* type, const SGSparseVectorEntry<char>* first_entry,
    index_t feat_index, index_t y)
{
    push_node(BAD_CAST STR_SPARSE);

    string_t buf;
    snprintf(buf, STRING_LEN, "%"PRIi32, feat_index);
    if (xmlNewProp(m_stack_stream.back(), BAD_CAST STR_PROP_FEATINDEX,
                   BAD_CAST buf) == NULL) return false;
    return true;
}

bool
CSerializableXmlFile::write_sparseentry_end_wrapped(
    const TSGDataType* type, const SGSparseVectorEntry<char>* first_entry,
    index_t feat_index, index_t y)
{
    pop_node();

    return true;
}

bool
CSerializableXmlFile::write_item_begin_wrapped(
    const TSGDataType* type, index_t y, index_t x)
{
    if (type->m_ctype==CT_MATRIX || type->m_ctype==CT_SGMATRIX) {
        if (y==0)
        {
            if (x != 0) pop_node();

            string_t buf_x; snprintf(buf_x, STRING_LEN, "x%"PRIi32, x);
            if (!push_node(BAD_CAST buf_x)) return false;
        }
    }

    push_node(BAD_CAST STR_ITEM);

    return true;
}

bool
CSerializableXmlFile::write_item_end_wrapped(
    const TSGDataType* type, index_t y, index_t x)
{
    pop_node();

    return true;
}

bool
CSerializableXmlFile::write_sgserializable_begin_wrapped(
    const TSGDataType* type, const char* sgserializable_name,
    EPrimitiveType generic)
{
    if (*sgserializable_name == '\0') {
        if (xmlNewProp(m_stack_stream.back(), BAD_CAST STR_PROP_IS_NULL,
                       BAD_CAST STR_TRUE) == NULL) return false;
        return true;
    }

    if (xmlNewProp(m_stack_stream.back(),
                   BAD_CAST STR_PROP_INSTANCE_NAME,
                   BAD_CAST sgserializable_name) == NULL) return false;

    if (generic != PT_NOT_GENERIC) {
        string_t buf;
        TSGDataType::ptype_to_string(buf, generic, STRING_LEN);
        if (xmlNewProp(m_stack_stream.back(),
                       BAD_CAST STR_PROP_GENERIC_NAME, BAD_CAST buf)
            == NULL) return false;
    }

    return true;
}

bool
CSerializableXmlFile::write_sgserializable_end_wrapped(
    const TSGDataType* type, const char* sgserializable_name,
    EPrimitiveType generic)
{
    return true;
}

bool
CSerializableXmlFile::write_type_begin_wrapped(
    const TSGDataType* type, const char* name, const char* prefix)
{
    if (!push_node(BAD_CAST name)) return false;

    SG_SET_LOCALE_C;

    string_t buf;
    type->to_string(buf, STRING_LEN);
    if (xmlNewProp(m_stack_stream.back(), BAD_CAST STR_PROP_TYPE,
                   BAD_CAST buf) == NULL) return false;

    return true;
}

bool
CSerializableXmlFile::write_type_end_wrapped(
    const TSGDataType* type, const char* name, const char* prefix)
{
    pop_node();

    SG_RESET_LOCALE;

    return true;
}

#endif /* HAVE_XML  */