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package javax.faces.model;
import java.util.SortedMap;
import javax.servlet.jsp.jstl.sql.Result;
/**
* <p><strong>ResultDataModel</strong> is a convenience implementation of
* {@link DataModel} that wraps a JSTL <code>Result</code> object, typically
* representing the results of executing an SQL query via JSTL tags.</p>
*/
public class ResultDataModel extends DataModel<SortedMap<String,Object>> {
// ------------------------------------------------------------ Constructors
/**
* <p>Construct a new {@link ResultDataModel} with no specified
* wrapped data.</p>
*/
public ResultDataModel() {
this(null);
}
/**
* <p>Construct a new {@link ResultDataModel} wrapping the specified
* <code>Result</code>.</p>
*
* @param result <code>Result</code> to be wrapped (if any)
*/
public ResultDataModel(Result result) {
super();
setWrappedData(result);
}
// ------------------------------------------------------ Instance Variables
// The current row index (zero relative)
private int index = -1;
// The Result we are wrapping
private Result result = null;
// The individual rows of this Result, each represented as a Map
// with column names as keys and associated data values as values
private SortedMap rows[] = null;
// -------------------------------------------------------------- Properties
/**
* <p>Return <code>true</code> if there is <code>wrappedData</code>
* available, and the current value of <code>rowIndex</code> is greater
* than or equal to zero, and less than the length of the array returned
* by calling <code>getRows()</code> on the underlying <code>Result</code>.
* Otherwise, return <code>false</code>.</p>
*
* @throws javax.faces.FacesException if an error occurs getting the row availability
*/
@Override
public boolean isRowAvailable() {
if (result == null) {
return (false);
} else if ((index >= 0) && (index < rows.length)) {
return (true);
} else {
return (false);
}
}
/**
* <p>If there is <code>wrappedData</code> available, return the
* length of the array returned by calling <code>getRows()</code>
* on the underlying <code>Result</code>. If no <code>wrappedData</code>
* is available, return -1.</p>
*
* @throws javax.faces.FacesException if an error occurs getting the row count
*/
@Override
public int getRowCount() {
if (result == null) {
return (-1);
}
return (rows.length);
}
/**
* <p>If row data is available, return the <code>SortedMap</code> array
* element at the index specified by <code>rowIndex</code> of the
* array returned by calling <code>getRows()</code> on the underlying
* <code>Result</code>. If no wrapped data is available,
* return <code>null</code>.</p>
*
* <p>Note that, if a non-<code>null</code> <code>Map</code> is returned
* by this method, it will contain the values of the columns for the
* current row, keyed by column name. Column name comparisons must be
* performed in a case-insensitive manner.</p>
*
* @throws javax.faces.FacesException if an error occurs getting the row data
* @throws IllegalArgumentException if now row data is available
* at the currently specified row index
*/
@Override
public SortedMap<String,Object> getRowData() {
if (result == null) {
return (null);
} else if (!isRowAvailable()) {
throw new NoRowAvailableException();
} else {
//noinspection unchecked
return ((SortedMap<String,Object>)rows[index]);
}
}
/**
* @throws javax.faces.FacesException {@inheritDoc}
*/
@Override
public int getRowIndex() {
return (index);
}
/**
* @throws javax.faces.FacesException {@inheritDoc}
* @throws IllegalArgumentException {@inheritDoc}
*/
@Override
public void setRowIndex(int rowIndex) {
if (rowIndex < -1) {
throw new IllegalArgumentException();
}
int old = index;
index = rowIndex;
if (result == null) {
return;
}
DataModelListener [] listeners = getDataModelListeners();
if ((old != index) && (listeners != null)) {
SortedMap<String,Object> rowData = null;
if (isRowAvailable()) {
rowData = getRowData();
}
DataModelEvent event =
new DataModelEvent(this, index, rowData);
int n = listeners.length;
for (int i = 0; i < n; i++) {
if (null != listeners[i]) {
listeners[i].rowSelected(event);
}
}
}
}
@Override
public Object getWrappedData() {
return (this.result);
}
/**
* @throws ClassCastException if <code>data</code> is
* non-<code>null</code> and is not a <code>Result</code>
*/
@Override
public void setWrappedData(Object data) {
if (data == null) {
result = null;
rows = null;
setRowIndex(-1);
} else {
result = (Result) data;
rows = result.getRows();
index = -1;
setRowIndex(0);
}
}
}