/*
* $Id$
* $Name$
*
* 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++) {
if (cells[i] != null) {
return false;
}
}
return true;
}
/**
* Gets the number of columns.
*
* @return a value
*/
public int getColumns() {
return columns;
}
/**
* Sets the horizontal alignment.
*
* @param value the new value
*/
public void setHorizontalAlignment(int value) {
horizontalAlignment = value;
}
/**
* Gets the horizontal alignment.
*
* @return a value
*/
public int getHorizontalAlignment() {
return horizontalAlignment;
}
}