beans/beancontext/BeanContextChild.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * particular file as subject to the "Classpath" exception as provided
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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package java.beans.beancontext;

import java.beans.PropertyChangeListener;
import java.beans.VetoableChangeListener;
import java.beans.PropertyVetoException;

import java.beans.beancontext.BeanContext;

/**
 * <p>
 * JavaBeans wishing to be nested within, and obtain a reference to their
 * execution environment, or context, as defined by the BeanContext
 * sub-interface shall implement this interface.
 * </p>
 * <p>
 * Conformant BeanContexts shall as a side effect of adding a BeanContextChild
 * object shall pass a reference to itself via the setBeanContext() method of
 * this interface.
 * </p>
 * <p>
 * Note that a BeanContextChild may refuse a change in state by throwing
 * PropertyVetoedException in response.
 * </p>
 * <p>
 * In order for persistence mechanisms to function properly on BeanContextChild
 * instances across a broad variety of scenarios, implementing classes of this
 * interface are required to define as transient, any or all fields, or
 * instance variables, that may contain, or represent, references to the
 * nesting BeanContext instance or other resources obtained
 * from the BeanContext via any unspecified mechanisms.
 * </p>
 *
 * @author      Laurence P. G. Cable
 * @since       1.2
 *
 * @see java.beans.beancontext.BeanContext
 * @see java.beans.PropertyChangeEvent
 * @see java.beans.PropertyChangeListener
 * @see java.beans.PropertyVetoException
 * @see java.beans.VetoableChangeListener
 */

public interface BeanContextChild {

    /**
     * <p>
     * Objects that implement this interface,
     * shall fire a java.beans.PropertyChangeEvent, with parameters:
     *
     * propertyName "beanContext", oldValue (the previous nesting
     * <code>BeanContext</code> instance, or <code>null</code>),
     * newValue (the current nesting
     * <code>BeanContext</code> instance, or <code>null</code>).
     * <p>
     * A change in the value of the nesting BeanContext property of this
     * BeanContextChild may be vetoed by throwing the appropriate exception.
     * </p>
     * @param bc The <code>BeanContext</code> with which
     * to associate this <code>BeanContextChild</code>.
     * @throws <code>PropertyVetoException</code> if the
     * addition of the specified <code>BeanContext</code> is refused.
     */
    void setBeanContext(BeanContext bc) throws PropertyVetoException;

    /**
     * Gets the <code>BeanContext</code> associated
     * with this <code>BeanContextChild</code>.
     * @return the <code>BeanContext</code> associated
     * with this <code>BeanContextChild</code>.
     */
    BeanContext getBeanContext();

    /**
     * Adds a <code>PropertyChangeListener</code>
     * to this <code>BeanContextChild</code>
     * in order to receive a <code>PropertyChangeEvent</code>
     * whenever the specified property has changed.
     * @param name the name of the property to listen on
     * @param pcl the <code>PropertyChangeListener</code> to add
     */
    void addPropertyChangeListener(String name, PropertyChangeListener pcl);

    /**
     * Removes a <code>PropertyChangeListener</code> from this
     * <code>BeanContextChild</code>  so that it no longer
     * receives <code>PropertyChangeEvents</code> when the
     * specified property is changed.
     *
     * @param name the name of the property that was listened on
     * @param pcl the <code>PropertyChangeListener</code> to remove
     */
    void removePropertyChangeListener(String name, PropertyChangeListener pcl);

    /**
     * Adds a <code>VetoableChangeListener</code> to
     * this <code>BeanContextChild</code>
     * to receive events whenever the specified property changes.
     * @param name the name of the property to listen on
     * @param vcl the <code>VetoableChangeListener</code> to add
     */
    void addVetoableChangeListener(String name, VetoableChangeListener vcl);

    /**
     * Removes a <code>VetoableChangeListener</code> from this
     * <code>BeanContextChild</code> so that it no longer receives
     * events when the specified property changes.
     * @param name the name of the property that was listened on.
     * @param vcl the <code>VetoableChangeListener</code> to remove.
     */
    void removeVetoableChangeListener(String name, VetoableChangeListener vcl);

}