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package org.richfaces.model;
import java.util.Collection;
import javax.faces.model.DataModel;
import javax.faces.model.DataModelEvent;
import javax.faces.model.DataModelListener;
/**
* <p class="changed_added_2_2"><strong>CollectionDataModel</strong> is a convenience
* implementation of {@link DataModel} that wraps an <code>Collection</code> of
* Java objects.</p>
*/
public class CollectionDataModel<E> extends DataModel<E> {
// ------------------------------------------------------------ Constructors
/**
* <p>Construct a new {@link CollectionDataModel} with no specified
* wrapped data.</p>
*/
public CollectionDataModel() {
this(null);
}
/**
* <p>Construct a new {@link CollectionDataModel} wrapping the specified
* list.</p>
*
* @param collection Collection to be wrapped.
*/
public CollectionDataModel(Collection<E> collection) {
super();
setWrappedData(collection);
}
// ------------------------------------------------------ Instance Variables
// The current row index (zero relative)
private int index = -1;
private Collection<E> inner;
private E[] arrayFromInner;
// -------------------------------------------------------------- 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 size of the list. Otherwise,
* return <code>false</code>.</p>
*
* @throws javax.faces.FacesException if an error occurs getting the row availability
*/
public boolean isRowAvailable() {
if (arrayFromInner == null) {
return (false);
} else if ((index >= 0) && (index < arrayFromInner.length)) {
return (true);
} else {
return (false);
}
}
/**
* <p>If there is <code>wrappedData</code> available, return the
* length of the list. If no <code>wrappedData</code> is available,
* return -1.</p>
*
* @throws javax.faces.FacesException if an error occurs getting the row count
*/
public int getRowCount() {
if (arrayFromInner == null) {
return (-1);
}
return (arrayFromInner.length);
}
/**
* <p>If row data is available, return the array element at the index
* specified by <code>rowIndex</code>. If no wrapped data is available,
* return <code>null</code>.</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
*/
public E getRowData() {
if (arrayFromInner == null) {
return (null);
} else if (!isRowAvailable()) {
throw new NoRowAvailableException();
} else {
return (arrayFromInner[index]);
}
}
/**
* @throws javax.faces.FacesException {@inheritDoc}
*/
public int getRowIndex() {
return (index);
}
/**
* @throws javax.faces.FacesException {@inheritDoc}
* @throws IllegalArgumentException {@inheritDoc}
*/
public void setRowIndex(int rowIndex) {
if (rowIndex < -1) {
throw new IllegalArgumentException();
}
int old = index;
index = rowIndex;
if (arrayFromInner == null) {
return;
}
DataModelListener [] listeners = getDataModelListeners();
if ((old != index) && (listeners != null)) {
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);
}
}
}
}
public Object getWrappedData() {
return (this.inner);
}
/**
* Set the wrapped data.
*
* @param data the wrapped data.
* @throws ClassCastException if <code>data</code> is
* non-<code>null</code> and is not a <code>Collection</code>
*/
public void setWrappedData(Object data) {
if (data == null) {
inner = null;
arrayFromInner = null;
setRowIndex(-1);
} else {
inner = (Collection<E>) data;
arrayFromInner = (E[]) new Object[inner.size()];
inner.toArray(arrayFromInner);
setRowIndex(0);
}
}
}