/** The index of the first category to present. */
private int firstCategoryIndex;
/** The maximum number of categories to present. */
private int maximumCategoryCount;
/**
* Creates a new instance.
*
* @param underlying the underlying dataset (<code>null</code> not
* permitted).
* @param firstColumn the index of the first visible column from the
* underlying dataset.
* @param maxColumns the maximumColumnCount.
*/
public [[#variable1512e020]]( [[#variable1504b9a0]] underlying, int firstColumn, int maxColumns) {
this.underlying = underlying;
this.firstCategoryIndex = firstColumn;
this.maximumCategoryCount = maxColumns;
}
/**
* Returns the underlying dataset that was supplied to the constructor.
*
* @return The underlying dataset (never <code>null</code>).
*/
public [[#variable1504b9a0]] getUnderlyingDataset() {
return this.underlying;
}
/**
* Returns the index of the first visible category.
*
* @return The index.
*
* @see #setFirstCategoryIndex(int)
*/
public int getFirstCategoryIndex() {
return this.firstCategoryIndex;
}
/**
* Sets the index of the first category that should be used from the
* underlying dataset, and sends a {@link DatasetChangeEvent} to all
* registered listeners.
*
* @param first the index.
*
* @see #getFirstCategoryIndex()
*/
public void setFirstCategoryIndex(int first) {
if (first < 0 || first >= this.underlying.getColumnCount()) {
throw new IllegalArgumentException("Invalid index.");
}
this.firstCategoryIndex = first;
fireDatasetChanged();
}
/**
* Returns the maximum category count.
*
* @return The maximum category count.
*
* @see #setMaximumCategoryCount(int)
*/
public int getMaximumCategoryCount() {
return this.maximumCategoryCount;
}
/**
* Sets the maximum category count and sends a {@link DatasetChangeEvent}
* to all registered listeners.
*
* @param max the maximum.
*
* @see #getMaximumCategoryCount()
*/
public void setMaximumCategoryCount(int max) {
if (max < 0) {
throw new IllegalArgumentException("Requires \'max\' >= 0.");
}
this.maximumCategoryCount = max;
fireDatasetChanged();
}
/**
* Returns the index of the last column for this dataset, or -1.
*
* @return The index.
*/
private int lastCategoryIndex() {
if (this.maximumCategoryCount == 0) {
return -1;
}
return Math.min(this.firstCategoryIndex + this.maximumCategoryCount, this.underlying.getColumnCount()) - 1;
}
/**
* Returns the index for the specified column key.
*
* @param key the key.
*
* @return The column index, or -1 if the key is not recognised.
*/
public int getColumnIndex(Comparable key) {
int index = this.underlying.getColumnIndex(key);
if (index >= this.firstCategoryIndex && index <= lastCategoryIndex()) {
return index - this.firstCategoryIndex;
}
return -1; // we didn't find the key
}
/**
* Returns the column key for a given index.
*
* @param column the column index (zero-based).
*
* @return The column key.
*
* @throws IndexOutOfBoundsException if <code>row</code> is out of bounds.
*/
public Comparable getColumnKey(int column) {
return this.underlying.getColumnKey(column + this.firstCategoryIndex);
}
/**
* Returns the column keys.
*
* @return The keys.
*
* @see #getColumnKey(int)
*/
public List getColumnKeys() {
List result = new java.util.ArrayList();
int last = lastCategoryIndex();
for (int i = this.firstCategoryIndex; i < last; i++) {
result.add(this.underlying.getColumnKey(i));
}
return Collections.unmodifiableList(result);
}
/**
* Returns the row index for a given key.
*
* @param key the row key.
*
* @return The row index, or <code>-1</code> if the key is unrecognised.
*/
public int getRowIndex(Comparable key) {
return this.underlying.getRowIndex(key);
}
/**
* Returns the row key for a given index.
*
* @param row the row index (zero-based).
*
* @return The row key.
*
* @throws IndexOutOfBoundsException if <code>row</code> is out of bounds.
*/
public Comparable getRowKey(int row) {
return this.underlying.getRowKey(row);
}
/**
* Returns the row keys.
*
* @return The keys.
*/
public List getRowKeys() {
return this.underlying.getRowKeys();
}
/**
* Returns the value for a pair of keys.
*
* @param rowKey the row key (<code>null</code> not permitted).
* @param columnKey the column key (<code>null</code> not permitted).
*
* @return The value (possibly <code>null</code>).
*
* @throws UnknownKeyException if either key is not defined in the dataset.
*/
public Number getValue(Comparable rowKey, Comparable columnKey) {
int r = getRowIndex(rowKey);
int c = getColumnIndex(columnKey);
if (c != -1) {
return this.underlying.getValue(r, c + this.firstCategoryIndex);
}
else {
throw new UnknownKeyException("Unknown columnKey: " + columnKey);
}
}
/**
* Returns the number of columns in the table.
*
* @return The column count.
*/
public int getColumnCount() {
int last = lastCategoryIndex();
if (last == -1) {
return 0;
}
else {
return Math.max(last - this.firstCategoryIndex + 1, 0);
}
}
/**
* Returns the number of rows in the table.
*
* @return The row count.
*/
public int getRowCount() {
return this.underlying.getRowCount();
}
/**
* Returns a value from the table.
*
* @param row the row index (zero-based).
* @param column the column index (zero-based).
*
* @return The value (possibly <code>null</code>).
*/
public Number getValue(int row, int column) {
return this.underlying.getValue(row, column + this.firstCategoryIndex);
}
|