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The MyFaces Commons Subproject provides base classes for usage in both the MyFaces implementation and the MyFaces Tomahawk components. This is also a general set of utility classes for usage in your JSF projects independent of the implementation you might be deciding upon.

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/*
 * Copyright 2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.myfaces.component;

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;

/**
 * ExecuteOnCallback complementing the ExecuteOnCapable
 * interface for extended components
 *
 * With findComponent - you get a component, but this component might
 * not be prepared to actually have the correct context information. This
 * is important for e.g. DataTables. They'll need to prepare the component
 * with the current row-state to make sure that the method is executed
 * correctly.
 *
 * @author Martin Marinschek (latest modification by $Author: grantsmith $)
 */
public interface ExecuteOnCallback
{
    public Object execute(FacesContext context, UIComponent component);
}