/*
 *
 *  Copyright (C) 1994-2018, 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 DcmLongText
 *
 */

#ifndef DCVRLT_H
#define DCVRLT_H

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

#include "dcmtk/dcmdata/dcchrstr.h"


/** a class representing the DICOM value representation 'Long Text' (LT)
 */
class DCMTK_DCMDATA_EXPORT DcmLongText
  : public DcmCharString
{
  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
     */
    DcmLongText(const DcmTag &tag,
                const Uint32 len = 0);

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

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

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

    /** comparison operator that compares the normalized value of this object
     *  with a given object of the same type. The tag of the element is also
     *  considered as the first component that is compared, followed by the
     *  object types (VR, i.e. DCMTK'S EVR) and the comparison of all value
     *  components of the object, preferably in the order declared in the
     *  object (if applicable).
     *  @param  rhs the right hand side of the comparison
     *  @return 0 if the object values are equal.
     *    -1 if this element has fewer components than the rhs element.
     *    Also -1 if the value of the first component that does not match
     *    is lower in this object than in rhs. Also returned if rhs
     *    be casted to this object type or both objects are of
     *    different VR (i.e. the DcmEVR returned by the element's ident()
     *    call are different).
     *    1 if either this element has more components than the rhs element, or
     *    if the first component that does not match is greater in this object
     *    than in rhs object.
     */
    virtual int compare(const DcmElement& rhs) const;

    /** clone method
     *  @return deep copy of this object
     */
    virtual DcmObject *clone() const
    {
      return new DcmLongText(*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_LT)
     */
    virtual DcmEVR ident() const;

    /** check whether stored value conforms to the VR and to the specified VM.
     *  Currently, the VR checker only supports ASCII (ISO_IR 6) and Latin-1 (ISO_IR 100).
     *  All other specific character sets disable the check of the value representation.
     *  @param vm parameter not used for this VR
     *  @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 = "",
                                   const OFBool oldFormat = OFFalse);

    /** get the value multiplicity.
     *  Since the backslash "\" is not regarded as a separator the value
     *  multiplicity is always 1.
     *  @return value multiplicity of the currently stored value
     */
    virtual unsigned long getVM();

    /** 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);

    /** get the string value (all components)
     *  @param stringVal string variable in which the result value is stored
     *  @param normalize remove trailing spaces if OFTrue
     *  @return status, EC_Normal if successful, an error code otherwise
     */
    virtual OFCondition getOFStringArray(OFString &stringVal,
                                         OFBool normalize = OFTrue);

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

    /** check whether given string value conforms to the VR "LT" (Long Text)
     *  @param value string value to be checked
     *  @param charset character set (according to the value of the SpecificCharacterSet
     *    element) to be used for checking the string value. The default is ASCII (7-bit).
     *    Currently, the VR checker only supports ASCII (ISO_IR 6) and Latin-1 (ISO_IR 100).
     *    All other values disable the check of the value representation, e.g. "UNKNOWN".
     *  @return status of the check, EC_Normal if value is correct, an error code otherwise
     */
    static OFCondition checkStringValue(const OFString &value,
                                        const OFString &charset = "");
};


#endif // DCVRLT_H
