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// @HEADER
// ***********************************************************************
//
//                    Teuchos: Common Tools Package
//                 Copyright (2004) Sandia Corporation
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
//
// ***********************************************************************
// @HEADER

#ifndef TEUCHOS_TABLEFORMAT_H
#define TEUCHOS_TABLEFORMAT_H

/*! \file Teuchos_TableFormat.hpp
  \brief Provides utilities for formatting tabular output
*/

#include "Teuchos_ConfigDefs.hpp"
#include "Teuchos_TableColumn.hpp"
#include <iostream>

namespace Teuchos
{

/** \brief Encapsulation of formatting specifications for writing data
 * in a clean tabular form.
 *
 * Note: it is left to the programmer to avoid invalid settings such as
 * negative column spaces, zero page widths, and other such potentially
 * bad things.
 *
 * KL 30 Apr 2006 -- initial design.
 */
class TableFormat
{
public:
  /** \brief Construct with a header and default format settings */
  TableFormat () :
    pageWidth_ (80),
    precision_ (4),
    columnSpacing_ (4),
    lineInterval_ (10),
    columnWidths_ ()
  {}

  /** \brief Get the maximum number of characters per line.
   * Default is 80. */
  int pageWidth() const {return pageWidth_;}

  /** \brief Get the precision for writing doubles.
   * Default is 4. */
  int precision() const {return precision_;}

  /** \brief Get the number of characters to be left as blank
   * spaces in each column. Default is 4. */
  int columnSpacing() const {return columnSpacing_;}

  /** \brief Set the number of characters on a line.
   * This quantity can be updated within the const
   * method writeWholeTables() */
  void setPageWidth(int pw) const {pageWidth_ = pw;}

  /** \brief Set the precision for writing doubles */
  void setPrecision(int p) {precision_ = p;}

  /** \brief Set the number of characters to be left as blank spaces in each column */
  void setColumnSpacing(int columnSpacing_in) {columnSpacing_ = columnSpacing_in;}

  /** \brief Set the interval at which a horizontal line will be written between
   * rows.
   *
   * \break lineInterval [in] the number of rows between each horizontal line
   */
  void setRowsBetweenLines(int lineInterval) {lineInterval_=lineInterval;}

  /** \brief Return a horizontal line in dashes "----"
   * the width of the page.
   *
   * Originally called <tt>hbar</tt>, but changed to avoid
   * possible confusion for physicists expecting <tt>hbar()</tt> to return
   * \f$1.05457168e-34\f$ :-).  */
  std::string thinline() const ;

  /** \brief Return a thick horizontal line in equal signs "====" the
   * width of the page */
  std::string thickline() const ;

  /** \brief Return a std::string full of blanks up to the requested size */
  std::string blanks(int size) const ;

  /** \brief Computes the column width required to write all values
   * to the required precision.
   *
   * \param name [in] the title of the column
   * \param column [in] the column data
   *
   * Postcondition: colString.size()==values.size()
   */
  int computeRequiredColumnWidth(const std::string& name,
    const TableColumn& column) const ;

  /** \brief Set the column widths to be used for subsequent rows */
  void setColumnWidths(const Array<int>& colWidths)
    {columnWidths_ = colWidths;}

  /** \brief Write the row of entries.
   *
   * \param out [in/out] the output stream to which the row will be written
   * \param entries [in] the data to be written into this row. Each array
   * element is the entry for a column on this row.
   */
  void writeRow(
    std::ostream& out,
    const Array<RCP<TableEntry> >& entries
    ) const;

  /** \brief Write the row of entries.
   *
   * \param out [in/out] the output stream to which the row will be written
   * \param columns [in] the columns of data from which this row is to be sliced
   * \param rowIndex [in] the index into the columns used to obtain the values for
   * this row
   */
  void writeRow(
    std::ostream& out,
    int rowIndex,
    const Array<TableColumn>& columns
    ) const;

  /** \brief . */
  void writeWholeTable(
    std::ostream& out,
    const std::string& tableTitle,
    const Array<std::string>& columnNames,
    const Array<TableColumn>& columns
    ) const ;

protected:

  int defaultColumnWidth() const {return 20;}

private:

  mutable int pageWidth_;
  int precision_;
  int columnSpacing_;
  //int maxNameSize_; // UNUSED
  int lineInterval_;
  Array<int> columnWidths_;
};


} // namespace Teuchos


#endif