gt:             if (cells[i] != null) {
context: /*
   * $Id: Row.java 4065 2009-09-16 23:09:11Z psoares33 $
   * $Name$
   *
   * Copyright 1999, 2000, 2001, 2002 by Bruno Lowagie.
   *
   * The contents of this file are subject to the Mozilla Public License Version 1.1
   * (the "License"); you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at http://www.mozilla.org/MPL/
   *
   * Software distributed under the License is distributed on an "AS IS" basis,
   * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
   * for the specific language governing rights and limitations under the License.
   *
   * The Original Code is 'iText, a free JAVA-PDF library'.
   *
   * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
   * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
   * All Rights Reserved.
   * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
   * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
   *
   * Contributor(s): all the names of the contributors are added in the source code
   * where applicable.
   *
   * Alternatively, the contents of this file may be used under the terms of the
   * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
   * provisions of LGPL are applicable instead of those above.  If you wish to
   * allow use of your version of this file only under the terms of the LGPL
   * License and not to allow others to use your version of this file under
   * the MPL, indicate your decision by deleting the provisions above and
   * replace them with the notice and other provisions required by the LGPL.
   * If you do not delete the provisions above, a recipient may use your version
   * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the MPL as stated above or under the terms of the GNU
   * Library General Public License as published by the Free Software Foundation;
   * either version 2 of the License, or any later version.
   *
   * This library is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
   * FOR A PARTICULAR PURPOSE. See the GNU LIBRARY GENERAL PUBLIC LICENSE for more
   * details.
   *
   * If you didn't download this code from the following link, you should check if
   * you aren't using an obsolete version:
   * http://www.lowagie.com/iText/
   */
  
  package com.lowagie.text;
  
  import java.util.ArrayList;
  import com.lowagie.text.error_messages.MessageLocalization;
  
  /**
   * A <CODE>Row</CODE> is part of a <CODE>Table</CODE>
   * and contains some <CODE>Cells</CODE>.
   * <P>
   * All <CODE>Row</CODE>s are constructed by a <CODE>Table</CODE>-object.
   * You don't have to construct any <CODE>Row</CODE> yourself.
   * In fact you can't construct a <CODE>Row</CODE> outside the package.
   * <P>
   * Since a <CODE>Cell</CODE> can span several rows and/or columns
   * a row can contain reserved space without any content.
   *
   * @see   Element
   * @see   Cell
   * @see   Table
   */
  public class Row implements Element {
      
      // constants
      
  	/** id of a null element in a Row*/
      public static final int NULL = 0;
      
      /** id of the Cell element in a Row*/
      public static final int CELL = 1;
      
      /** id of the Table element in a Row*/
      public static final int TABLE = 2;
      
      // member variables
      
      /** This is the number of columns in the <CODE>Row</CODE>. */
      protected int columns;
      
      /** This is a valid position the <CODE>Row</CODE>. */
      protected int currentColumn;
      
      /** This is the array that keeps track of reserved cells. */
      protected boolean[] reserved;
      
      /** This is the array of Objects (<CODE>Cell</CODE> or <CODE>Table</CODE>). */
      protected Object[] cells;
      
      /** This is the vertical alignment. */
      protected int horizontalAlignment;
      
      // constructors
      
      /**
       * Constructs a <CODE>Row</CODE> with a certain number of <VAR>columns</VAR>.
       *
       * @param columns   a number of columns
       */
      protected Row(int columns) {
          this.columns = columns;
          reserved = new boolean[columns];
          cells = new Object[columns];
          currentColumn = 0;
      }
      
      // implementation of the Element-methods
      
      /**
       * Processes the element by adding it (or the different parts) to a
       * <CODE>ElementListener</CODE>.
       *
       * @param listener  an <CODE>ElementListener</CODE>
       * @return  <CODE>true</CODE> if the element was processed successfully
       */
      public boolean process(ElementListener listener) {
          try {
              return listener.add(this);
          }
          catch(DocumentException de) {
              return false;
          }
      }
      
      /**
       * Gets the type of the text element.
       *
       * @return  a type
       */
      public int type() {
          return Element.ROW;
      }
      
      /**
       * Gets all the chunks in this element.
       *
       * @return  an <CODE>ArrayList</CODE>
       */
      public ArrayList getChunks() {
          return new ArrayList();
      }
      
  	/**
  	 * @see com.lowagie.text.Element#isContent()
  	 * @since	iText 2.0.8
  	 */
  	public boolean isContent() {
  		return true;
  	}
  
  	/**
  	 * @see com.lowagie.text.Element#isNestable()
  	 * @since	iText 2.0.8
  	 */
  	public boolean isNestable() {
  		return false;
  	}
      
      // method to delete a column
      
      /**
       * Returns a <CODE>Row</CODE> that is a copy of this <CODE>Row</CODE>
       * in which a certain column has been deleted.
       *
       * @param column  the number of the column to delete
       */    
      void deleteColumn(int column) {
          if ((column >= columns) || (column < 0)) {
              throw new IndexOutOfBoundsException(MessageLocalization.getComposedMessage("getcell.at.illegal.index.1", column));
          }
          columns--;
          boolean newReserved[] = new boolean[columns];
          Object newCells[] = new Cell[columns];
          
          for (int i = 0; i < column; i++) {
              newReserved[i] = reserved[i];
              newCells[i] = cells[i];
              if (newCells[i] != null && (i + ((Cell) newCells[i]).getColspan() > column)) {
                  ((Cell) newCells[i]).setColspan(((Cell) cells[i]).getColspan() - 1);
              }
          }
          for (int i = column; i < columns; i++) {
              newReserved[i] = reserved[i + 1];
              newCells[i] = cells[i + 1];
          }
          if (cells[column] != null && ((Cell) cells[column]).getColspan() > 1) {
              newCells[column] = cells[column];
              ((Cell) newCells[column]).setColspan(((Cell) newCells[column]).getColspan() - 1);
          }
          reserved = newReserved;
          cells = newCells;
      }
      
      // methods
      
      /**
       * Adds a <CODE>Cell</CODE> to the <CODE>Row</CODE>.
       *
       * @param       element the element to add (currently only Cells and Tables supported)
       * @return      the column position the <CODE>Cell</CODE> was added,
       *                      or <CODE>-1</CODE> if the <CODE>element</CODE> couldn't be added.
       */
      int addElement(Object element) {
          return addElement(element, currentColumn);
      }
      
      /**
       * Adds an element to the <CODE>Row</CODE> at the position given.
       *
       * @param       element the element to add. (currently only Cells and Tables supported
       * @param       column  the position where to add the cell.
       * @return      the column position the <CODE>Cell</CODE> was added,
       *                      or <CODE>-1</CODE> if the <CODE>Cell</CODE> couldn't be added.
       */
      int addElement(Object element, int column) {
          if (element == null) throw new NullPointerException(MessageLocalization.getComposedMessage("addcell.null.argument"));
          if ((column < 0) || (column > columns)) throw new IndexOutOfBoundsException(MessageLocalization.getComposedMessage("addcell.illegal.column.argument"));
          if ( !((getObjectID(element) == CELL) || (getObjectID(element) == TABLE)) ) throw new IllegalArgumentException(MessageLocalization.getComposedMessage("addcell.only.cells.or.tables.allowed"));
          
          int lColspan = ( (Cell.class.isInstance(element)) ? ((Cell) element).getColspan() : 1);
          
          if (!reserve(column, lColspan)) {
              return -1;
          }
          
          cells[column] = element;
          currentColumn += lColspan - 1;
          
          return column;
      }
      
      /**
       * Puts <CODE>Cell</CODE> to the <CODE>Row</CODE> at the position given, doesn't reserve colspan.
       *
       * @param   aElement    the cell to add.
       * @param   column  the position where to add the cell.
       */
      void setElement(Object aElement, int column) {
          if (reserved[column]) throw new IllegalArgumentException(MessageLocalization.getComposedMessage("setelement.position.already.taken"));
          
          cells[column] = aElement;
          if (aElement != null) {
              reserved[column] = true;
          }
      }
      
      /**
       * Reserves a <CODE>Cell</CODE> in the <CODE>Row</CODE>.
       *
       * @param   column  the column that has to be reserved.
       * @return  <CODE>true</CODE> if the column was reserved, <CODE>false</CODE> if not.
       */
      boolean reserve(int column) {
          return reserve(column, 1);
      }
      
      
      /**
       * Reserves a <CODE>Cell</CODE> in the <CODE>Row</CODE>.
       *
       * @param   column  the column that has to be reserved.
       * @param   size    the number of columns
       * @return  <CODE>true</CODE> if the column was reserved, <CODE>false</CODE> if not.
       */
      boolean reserve(int column, int size) {
          if ((column < 0) || ((column + size) > columns)) throw new IndexOutOfBoundsException(MessageLocalization.getComposedMessage("reserve.incorrect.column.size"));
          
          for(int i=column; i < column + size; i++)
          {
              if (reserved[i]) {
                  // undo reserve
                  for(int j=i; j >= column; j--) {
                      reserved[j] = false;
                  }
                  return false;
              }
              reserved[i] = true;
          }
          return true;
      }
      
      // methods to retrieve information
      
      /**
       * Returns true/false when this position in the <CODE>Row</CODE> has been reserved, either filled or through a colspan of an Element.
       *
       * @param       column  the column.
       * @return      <CODE>true</CODE> if the column was reserved, <CODE>false</CODE> if not.
       */
      boolean isReserved(int column) {
          return reserved[column];
      }
      
      /**
       * Returns the type-id of the element in a Row.
       *
       * @param       column  the column of which you'd like to know the type
       * @return the type-id of the element in the row
       */
      int getElementID(int column) {
          if (cells[column] == null) return NULL;
          else if (Cell.class.isInstance(cells[column])) return CELL;
          else if (Table.class.isInstance(cells[column])) return TABLE;
          
          return -1;
      }
      
      /**
       * Returns the type-id of an Object.
       *
       * @param       element the object of which you'd like to know the type-id, -1 if invalid
       * @return the type-id of an object
       */
      int getObjectID(Object element) {
          if (element == null) return NULL;
          else if (Cell.class.isInstance(element)) return CELL;
          else if (Table.class.isInstance(element)) return TABLE; 
          return -1;
      }
      
      /**
       * Gets a <CODE>Cell</CODE> or <CODE>Table</CODE> from a certain column.
       *
       * @param   column  the column the <CODE>Cell/Table</CODE> is in.
       * @return  the <CODE>Cell</CODE>,<CODE>Table</CODE> or <VAR>Object</VAR> if the column was
       *                  reserved or null if empty.
       */
      public Object getCell(int column) {
          if ((column < 0) || (column > columns)) {
              throw new IndexOutOfBoundsException(MessageLocalization.getComposedMessage("getcell.at.illegal.index.1.max.is.2", String.valueOf(column), String.valueOf(columns)));
          }
          return cells[column];
      }
      
      /**
       * Checks if the row is empty.
       *
       * @return  <CODE>true</CODE> if none of the columns is reserved.
       */
      public boolean isEmpty() {
          for (int i = 0; i < columns; i++) {
  