/*
 *
 *  Copyright (C) 1994-2017, OFFIS e.V.
 *  All rights reserved.  See COPYRIGHT file for details.
 *
 *  This software and supporting documentation were developed by
 *
 *    OFFIS e.V.
 *    R&D Division Health
 *    Escherweg 2
 *    D-26121 Oldenburg, Germany
 *
 *
 *  Module:  dcmdata
 *
 *  Author:  Gerd Ehlers, Andreas Barth
 *
 *  Purpose: Interface of class DcmCodeString
 *
 */


#ifndef DCVRCS_H
#define DCVRCS_H

#include "dcmtk/config/osconfig.h"    /* make sure OS specific configuration is included first */

#include "dcmtk/dcmdata/dcbytstr.h"


/** a class representing the DICOM value representation 'Code String' (CS)
 */
class DCMTK_DCMDATA_EXPORT DcmCodeString
  : public DcmByteString
{

  public:

    /** constructor.
     *  Create new element from given tag and length.
     *  @param tag DICOM tag for the new element
     *  @param len value length for the new element
     */
    DcmCodeString(const DcmTag &tag,
                  const Uint32 len = 0);

    /** copy constructor
     *  @param old element to be copied
     */
    DcmCodeString(const DcmCodeString &old);

    /** destructor
     */
    virtual ~DcmCodeString();

    /** assignment operator
     *  @param obj element to be assigned/copied
     *  @return reference to this object
     */
    DcmCodeString &operator=(const DcmCodeString &obj);

    /** clone method
     *  @return deep copy of this object
     */
    virtual DcmObject *clone() const
    {
      return new DcmCodeString(*this);
    }

    /** Virtual object copying. This method can be used for DcmObject
     *  and derived classes to get a deep copy of an object. Internally
     *  the assignment operator is called if the given DcmObject parameter
     *  is of the same type as "this" object instance. If not, an error
     *  is returned. This function permits copying an object by value
     *  in a virtual way which therefore is different to just calling the
     *  assignment operator of DcmElement which could result in slicing
     *  the object.
     *  @param rhs - [in] The instance to copy from. Has to be of the same
     *                class type as "this" object
     *  @return EC_Normal if copying was successful, error otherwise
     */
    virtual OFCondition copyFrom(const DcmObject& rhs);

    /** get element type identifier
     *  @return type identifier of this class (EVR_CS)
     */
    virtual DcmEVR ident() const;

    /** check whether stored value conforms to the VR and to the specified VM
     *  @param vm value multiplicity (according to the data dictionary) to be checked for.
     *    (See DcmElement::checkVM() for a list of valid values.)
     *  @param oldFormat parameter not used for this VR (only for DA, TM)
     *  @return status of the check, EC_Normal if value is correct, an error code otherwise
     */
    virtual OFCondition checkValue(const OFString &vm = "1-n",
                                   const OFBool oldFormat = OFFalse);

    /** get a copy of a particular string component
     *  @param stringVal variable in which the result value is stored
     *  @param pos index of the value in case of multi-valued elements (0..vm-1)
     *  @param normalize delete leading and trailing spaces if OFTrue
     *  @return status, EC_Normal if successful, an error code otherwise
     */
    virtual OFCondition getOFString(OFString &stringVal,
                                    const unsigned long pos,
                                    OFBool normalize = OFTrue);

    // ensure inherited overloads of matches take part in overload resolution
    using DcmByteString::matches;

    /// @copydoc DcmByteString::matches(const OFString&,const OFString&,const OFBool) const
    virtual OFBool matches(const OFString& key,
                           const OFString& candidate,
                           const OFBool enableWildCardMatching = OFTrue) const;

    /// @copydoc DcmElement::isUniversalMatch()
    virtual OFBool isUniversalMatch(const OFBool normalize = OFTrue,
                                    const OFBool enableWildCardMatching = OFTrue);

    /* --- static helper functions --- */

    /** check whether given value conforms to value representation CS (Code String).
     *  Valid characters are: A-Z, 0-9, _ and ' ' (space).  The maximum length is 16.
     *  NB: This method is only used by the DicomDirInterface class and might be
     *      replaced by the following method (checkStringValue) in the future.
     *  @param value string value to be checked (single value only)
     *  @param pos returns index of first invalid character (0..n-1) if not NULL.
     *    Points to trailing zero byte (eos) if value is valid.
     *  @param checkLength check maximum length if OFTrue, ignore length if OFFalse
     *  @return OFTrue if value is valid, OFFalse otherwise
     */
    static OFBool checkVR(const OFString &value,
                          size_t *pos = NULL,
                          const OFBool checkLength = OFTrue);

    /** check whether given string value conforms to the VR "CS" (Code String)
     *  and to the specified VM.
     *  @param value string value to be checked (possibly multi-valued)
     *  @param vm value multiplicity (according to the data dictionary) to be checked for.
     *    (See DcmElement::checkVM() for a list of valid values.)
     *  @return status of the check, EC_Normal if value is correct, an error code otherwise
     */
    static OFCondition checkStringValue(const OFString &value,
                                        const OFString &vm = "1-n");
};


#endif // DCVRCS_H
