src/java.base/share/classes/java/util/spi/ResourceBundleControlProvider.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
 * by Oracle in the LICENSE file that accompanied this code.
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * accompanied this code).
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package java.util.spi;

import java.util.ResourceBundle;

/**
 * An interface for service providers that provide implementations of {@link
 * java.util.ResourceBundle.Control}. The <a
 * href="../ResourceBundle.html#default_behavior">default resource bundle loading
 * behavior</a> of the {@code ResourceBundle.getBundle} factory methods that take
 * no {@link java.util.ResourceBundle.Control} instance can be modified with {@code
 * ResourceBundleControlProvider} implementations.
 *
 * <p>Provider implementations are loaded from the application's class path
 * using {@link java.util.ServiceLoader} at the first invocation of the
 * {@code ResourceBundle.getBundle} factory method that takes no
 * {@link java.util.ResourceBundle.Control} instance.
 *
 * <p>All {@code ResourceBundleControlProvider}s are ignored in named modules.
 *
 * @author Masayoshi Okutsu
 * @since 1.8
 * @see ResourceBundle#getBundle(String, java.util.Locale, ClassLoader, ResourceBundle.Control)
 *      ResourceBundle.getBundle
 * @see java.util.ServiceLoader#load(Class)
 */
public interface ResourceBundleControlProvider {
    /**
     * Returns a {@code ResourceBundle.Control} instance that is used
     * to handle resource bundle loading for the given {@code
     * baseName}. This method must return {@code null} if the given
     * {@code baseName} isn't handled by this provider.
     *
     * @param baseName the base name of the resource bundle
     * @return a {@code ResourceBundle.Control} instance,
     *         or {@code null} if the given {@code baseName} is not
     *         applicable to this provider.
     * @throws NullPointerException if {@code baseName} is {@code null}
     */
    public ResourceBundle.Control getControl(String baseName);
}