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   * Licensed to the Apache Software Foundation (ASF) under one
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   * "License"); you may not use this file except in compliance
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  * Unless required by applicable law or agreed to in writing,
  * software distributed under the License is distributed on an
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  * specific language governing permissions and limitations
  * under the License.
 package javax.faces.model;
 import java.util.List;

Represents the data presented by a UIData component, together with some state information about the currently selected row within the datalist for use by listeners on UIData components. This class allows managed bean code to avoid binding directly to UIData components for typical uses.

Note that DataModel and its standard subclasses are not serializable, as there is no state in a DataModel object itself that needs to be preserved between render and restore-view. UIData components therefore do not store their DataModel when serialized; they just evaluate their "value" EL expression to refetch the object during the apply-request-values phase.

Because DataModel is not serializable, any managed bean that needs to be serialized and which has a member of type DataModel should therefore mark that member transient. If there is a need to preserve the datalist contained within the DataModel then ensure a reference to that list is stored in a non-transient member, or use a custom serialization method that explicitly serializes dataModel.getWrappedData. See Javadoc of JSF Specification for more.

Thomas Spiegl (latest modification by $Author: grantsmith $)
$Revision: 472558 $ $Date: 2006-11-08 18:36:53 +0100 (Mi, 08 Nov 2006) $
 public abstract class DataModel
     // FIELDS
     private List _listeners;
     // METHODS
     public void addDataModelListener(DataModelListener listener)
         if (listener == nullthrow new NullPointerException("listener");
         if ( == null)
              = new ArrayList();
         if ( == null)
             return new DataModelListener[0];

Return the number of rows of data available.

If the number of rows of data available is not known then -1 is returned. This may happen for DataModels that wrap sources of data such as java.sql.ResultSet that provide an iterator to access the "next item" rather than a fixed-size collection of data.

     abstract public int getRowCount();

Return the object associated with the current row index.

Method isRowAvailable may be called before attempting to access this method, to ensure that the data is available.

java.lang.RuntimeException subclass of some kind if the current row index is not within the range of the current wrappedData property.
     abstract public Object getRowData();

Get the current row index.
     abstract public int getRowIndex();

Get the entire collection of data associated with this component. Note that the actual type of the returned object depends upon the concrete subclass of DataModel; the object will represent an "ordered sequence of components", but may be implemented as an array, java.util.List, java.sql.ResultSet or other similar types.
    abstract public Object getWrappedData();

Returns true if a call to getRowData will return a valid object.
    abstract public boolean isRowAvailable();
    public void removeDataModelListener(DataModelListener listener)
        if (listener == nullthrow new NullPointerException("listener");
        if ( != null)

Set the current row index. This affects the behaviour of the getRowData method in particular. Parameter rowIndex may be -1 to indicate "no row", or may be a value between 0 and getRowCount()-1.
    abstract public void setRowIndex(int rowIndex);

Set the entire list of data associated with this component. Note that the actual type of the provided object must match the expectations of the concrete subclass of DataModel. See getWrappedData.
    abstract public void setWrappedData(Object data);
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