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/*
* $Id: Row.java 3373 2008-05-12 16:21:24Z xlv $
*
* 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.aowagie.text;
import java.util.ArrayList;
/**
* A Row is part of a Table
* and contains some Cells.
*
* All Rows are constructed by a Table-object.
* You don't have to construct any Row yourself.
* In fact you can't construct a Row outside the package.
*
* Since a Cell 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*/
private static final int NULL = 0;
/** id of the Cell element in a Row*/
private static final int CELL = 1;
/** id of the Table element in a Row*/
private static final int TABLE = 2;
// member variables
/** This is the number of columns in the Row. */
private final int columns;
/** This is a valid position the Row. */
private int currentColumn;
/** This is the array that keeps track of reserved cells. */
private final boolean[] reserved;
/** This is the array of Objects (Cell or Table). */
private final Object[] cells;
/** This is the vertical alignment. */
private int horizontalAlignment;
// constructors
/**
* Constructs a Row with a certain number of columns.
*
* @param columns a number of columns
*/
protected Row(final int columns) {
this.columns = columns;
this.reserved = new boolean[columns];
this.cells = new Object[columns];
this.currentColumn = 0;
}
// implementation of the Element-methods
/**
* Gets the type of the text element.
*
* @return a type
*/
@Override
public int type() {
return Element.ROW;
}
/**
* Gets all the chunks in this element.
*
* @return an ArrayList
*/
@Override
public ArrayList getChunks() {
return new ArrayList();
}
/**
* @see com.aowagie.text.Element#isContent()
* @since iText 2.0.8
*/
@Override
public boolean isContent() {
return true;
}
/**
* @see com.aowagie.text.Element#isNestable()
* @since iText 2.0.8
*/
@Override
public boolean isNestable() {
return false;
}
// methods
/**
* Adds an element to the Row 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 Cell was added,
* or -1 if the Cell couldn't be added.
*/
int addElement(final Object element, final int column) {
if (element == null) {
throw new NullPointerException("addCell - null argument");
}
if (column < 0 || column > this.columns) {
throw new IndexOutOfBoundsException("addCell - illegal column argument");
}
if ( !(getObjectID(element) == CELL || getObjectID(element) == TABLE) ) {
throw new IllegalArgumentException("addCell - only Cells or Tables allowed");
}
final int lColspan = Cell.class.isInstance(element) ? ((Cell) element).getColspan() : 1;
if (!reserve(column, lColspan)) {
return -1;
}
this.cells[column] = element;
this.currentColumn += lColspan - 1;
return column;
}
/**
* Puts Cell to the Row 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(final Object aElement, final int column) {
if (this.reserved[column]) {
throw new IllegalArgumentException("setElement - position already taken");
}
this.cells[column] = aElement;
if (aElement != null) {
this.reserved[column] = true;
}
}
/**
* Reserves a Cell in the Row.
*
* @param column the column that has to be reserved.
* @param size the number of columns
* @return true if the column was reserved, false if not.
*/
boolean reserve(final int column, final int size) {
if (column < 0 || column + size > this.columns) {
throw new IndexOutOfBoundsException("reserve - incorrect column/size");
}
for(int i=column; i < column + size; i++)
{
if (this.reserved[i]) {
// undo reserve
for(int j=i; j >= column; j--) {
this.reserved[j] = false;
}
return false;
}
this.reserved[i] = true;
}
return true;
}
// methods to retrieve information
/**
* Returns true/false when this position in the Row has been reserved, either filled or through a colspan of an Element.
*
* @param column the column.
* @return true if the column was reserved, false if not.
*/
boolean isReserved(final int column) {
return this.reserved[column];
}
/**
* 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
*/
private int getObjectID(final 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 Cell or Table from a certain column.
*
* @param column the column the Cell/Table is in.
* @return the Cell,Table or Object if the column was
* reserved or null if empty.
*/
public Object getCell(final int column) {
if (column < 0 || column > this.columns) {
throw new IndexOutOfBoundsException("getCell at illegal index :" + column + " max is " + this.columns);
}
return this.cells[column];
}
/**
* Checks if the row is empty.
*
* @return true if none of the columns is reserved.
*/
public boolean isEmpty() {
for (int i = 0; i < this.columns; i++) {
if (this.cells[i] != null) {
return false;
}
}
return true;
}
/**
* Gets the number of columns.
*
* @return a value
*/
public int getColumns() {
return this.columns;
}
/**
* Sets the horizontal alignment.
*
* @param value the new value
*/
public void setHorizontalAlignment(final int value) {
this.horizontalAlignment = value;
}
/**
* Gets the horizontal alignment.
*
* @return a value
*/
public int getHorizontalAlignment() {
return this.horizontalAlignment;
}
}