relax_ng_validator.cc

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/* relaxngvalidator.cpp
 * this class is agented off of the schemavalidator in libxml++
 * here is their license statement:
 *
 * libxml++ and this file are copyright (C) 2000 by Ari Johnson,
 * (C) 2002-2004 by the libxml dev team and
 * are covered by the GNU Lesser General Public License, which should be
 * included with libxml++ as the file COPYING.
 */

#include "relax_ng_validator.h"

#include <libxml/xmlerror.h>
#include <libxml/relaxng.h>
#include <libxml++/document.h>

#include "error.h"

namespace cyclus {

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
RelaxNGValidator::RelaxNGValidator() : schema_(0), valid_context_(0) {}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
RelaxNGValidator::~RelaxNGValidator() {
  release_underlying();
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void RelaxNGValidator::parse_context(xmlRelaxNGParserCtxtPtr context) {
  release_underlying();  // Free any existing info
  schema_ = xmlRelaxNGParse(context);
  if (!schema_) {
    throw ValidationError("Schema could not be parsed");
  }
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void RelaxNGValidator::parse_memory(const Glib::ustring& contents) {
  xmlRelaxNGParserCtxtPtr context =
    xmlRelaxNGNewMemParserCtxt(contents.c_str(), contents.bytes());
  parse_context(context);
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void RelaxNGValidator::release_underlying() {
  if (valid_context_) {
    xmlRelaxNGFreeValidCtxt(valid_context_);
    valid_context_ = 0;
  }

  if (schema_) {
    xmlRelaxNGFree(schema_);
    schema_ = 0;
  }
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
bool RelaxNGValidator::Validate(const xmlpp::Document* doc) {
  if (!doc) {
    throw ValidationError("Document pointer cannot be 0");
  }

  if (!schema_) {
    throw ValidationError("Must have a schema to validate document");
  }

  // A context is required at this stage only
  if (!valid_context_) {
    valid_context_ = xmlRelaxNGNewValidCtxt(schema_);
  }

  if (!valid_context_) {
    throw ValidationError("Couldn't create validating context");
  }

  int res;
  try {
    res = xmlRelaxNGValidateDoc(valid_context_, (xmlDocPtr)doc->cobj());
  } catch (xmlError e) {
    throw ValidationError(e.message);
  }

  if (res != 0) {
    throw ValidationError("Document failed schema validation");
  }

  return res;
}

}  // namespace cyclus