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JSR-000344: JavaServer(TM) Faces 2.2 API
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/*
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*
* Copyright (c) 1997-2012 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
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* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
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* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
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* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package javax.faces.model;
import java.util.Collection;
/**
* CollectionDataModel is a convenience
* implementation of {@link DataModel} that wraps an Collection of
* Java objects.
*/
public class CollectionDataModel extends DataModel {
// ------------------------------------------------------------ Constructors
/**
* Construct a new {@link CollectionDataModel} with no specified
* wrapped data.
*/
public CollectionDataModel() {
this(null);
}
/**
* Construct a new {@link CollectionDataModel} wrapping the specified
* list.
*
* @param collection Collection to be wrapped.
*/
public CollectionDataModel(Collection collection) {
super();
setWrappedData(collection);
}
// ------------------------------------------------------ Instance Variables
// The current row index (zero relative)
private int index = -1;
private Collection inner;
private E[] arrayFromInner;
// -------------------------------------------------------------- Properties
/**
* Return true if there is wrappedData
* available, and the current value of rowIndex is greater
* than or equal to zero, and less than the size of the list. Otherwise,
* return false.
*
* @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);
}
}
/**
* If there is wrappedData available, return the
* length of the list. If no wrappedData is available,
* return -1.
*
* @throws javax.faces.FacesException if an error occurs getting the row count
*/
public int getRowCount() {
if (arrayFromInner == null) {
return (-1);
}
return (arrayFromInner.length);
}
/**
* If row data is available, return the array element at the index
* specified by rowIndex. If no wrapped data is available,
* return null.
*
* @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 data is
* non-null and is not a Collection
*/
public void setWrappedData(Object data) {
if (data == null) {
inner = null;
arrayFromInner = null;
setRowIndex(-1);
} else {
inner = (Collection) data;
arrayFromInner = (E[]) new Object[inner.size()];
inner.toArray(arrayFromInner);
setRowIndex(0);
}
}
}