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, MarkupAttributes {
// membervariables
/** 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;
/** This is the number of columns in the Row. */
protected int columns;
/** This is a valid position the Row. */
protected int currentColumn;
/** This is the array that keeps track of reserved cells. */
protected boolean[] reserved;
/** This is the array of Objects (Cell or Table). */
protected Object[] cells;
/** This is the vertical alignment. */
protected int horizontalAlignment;
/** This is the vertical alignment. */
protected int verticalAlignment;
/** Contains extra markupAttributes */
protected Properties markupAttributes;
// constructors
/**
* Constructs a Row with a certain number of columns.
*
* @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
* ElementListener.
*
* @param listener an ElementListener
* @return true 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 ArrayList
*/
public ArrayList getChunks() {
return new ArrayList();
}
/**
* Returns a Row that is a copy of this Row
* 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("getCell at illegal index : " + 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]).colspan() > column)) {
((Cell) newCells[i]).setColspan(((Cell) cells[i]).colspan() - 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]).colspan() > 1) {
newCells[column] = cells[column];
((Cell) newCells[column]).setColspan(((Cell) newCells[column]).colspan() - 1);
}
reserved = newReserved;
cells = newCells;
}
// methods
/**
* Adds a Cell to the Row.
*
* @param element the element to add (currently only Cells and Tables supported)
* @return the column position the Cell was added,
* or -1 if the element couldn't be added.
*/
int addElement(Object element) {
return addElement(element, currentColumn);
}
/**
* 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(Object element, int column) {
if (element == null) throw new NullPointerException("addCell - null argument");
if ((column < 0) || (column > columns)) throw new IndexOutOfBoundsException("addCell - illegal column argument");
if ( !((getObjectID(element) == CELL) || (getObjectID(element) == TABLE)) ) throw new IllegalArgumentException("addCell - only Cells or Tables allowed");
int lColspan = ( (Cell.class.isInstance(element)) ? ((Cell) element).colspan() : 1);
if ( reserve(column, lColspan) == false ) {
return -1;
}
cells[column] = element;
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(Object aElement, int column) {
if (reserved[column] == true) throw new IllegalArgumentException("setElement - position already taken");
cells[column] = aElement;
if (aElement != null) {
reserved[column] = true;
}
}
/**
* Reserves a Cell in the Row.
*
* @param column the column that has to be reserved.
* @return true if the column was reserved, false if not.
*/
boolean reserve(int column) {
return reserve(column, 1);
}
/**
* 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(int column, int size) {
if ((column < 0) || ((column + size) > columns)) throw new IndexOutOfBoundsException("reserve - incorrect column/size");
for(int i=column; i < column + size; i++)
{
if (reserved[i] == true) {
// undo reserve
for(int j=i; j >= column; j--) {
reserved[i] = false;
}
return false;
}
reserved[i] = true;
}
return true;
}
/**
* Sets the horizontal alignment.
*
* @param value the new value
*/
public void setHorizontalAlignment(int value) {
horizontalAlignment = value;
}
/**
* Sets the vertical alignment.
*
* @param value the new value
*/
public void setVerticalAlignment(int value) {
verticalAlignment = value;
}
// 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(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 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(int column) {
if ((column < 0) || (column > columns)) {
throw new IndexOutOfBoundsException("getCell at illegal index :" + column + " max is " + columns);
}
return 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 < columns; i++) {
if (cells[i] != null) {
return false;
}
}
return true;
}
/**
* Gets the index of the current, valid position
*
* @return a value
*/
int validPosition() {
return currentColumn;
}
/**
* Gets the number of columns.
*
* @return a value
*/
public int columns() {
return columns;
}
/**
* Gets the horizontal alignment.
*
* @return a value
*/
public int horizontalAlignment() {
return horizontalAlignment;
}
/**
* Gets the vertical alignment.
*
* @return a value
*/
public int verticalAlignment() {
return verticalAlignment;
}
/**
* Checks if a given tag corresponds with this object.
*
* @param tag the given tag
* @return true if the tag corresponds
*/
public static boolean isTag(String tag) {
return ElementTags.ROW.equals(tag);
}
/**
* @see com.lowagie.text.MarkupAttributes#setMarkupAttribute(java.lang.String, java.lang.String)
*/
public void setMarkupAttribute(String name, String value) {
if (markupAttributes == null) markupAttributes = new Properties();
markupAttributes.put(name, value);
}
/**
* @see com.lowagie.text.MarkupAttributes#setMarkupAttributes(java.util.Properties)
*/
public void setMarkupAttributes(Properties markupAttributes) {
this.markupAttributes = markupAttributes;
}
/**
* @see com.lowagie.text.MarkupAttributes#getMarkupAttribute(java.lang.String)
*/
public String getMarkupAttribute(String name) {
return (markupAttributes == null) ? null : String.valueOf(markupAttributes.get(name));
}
/**
* @see com.lowagie.text.MarkupAttributes#getMarkupAttributeNames()
*/
public Set getMarkupAttributeNames() {
return Chunk.getKeySet(markupAttributes);
}
/**
* @see com.lowagie.text.MarkupAttributes#getMarkupAttributes()
*/
public Properties getMarkupAttributes() {
return markupAttributes;
}
}