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/*
 * Copyright (c) 1997, 2022 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package com.sun.xml.ws.api.model.wsdl;

import java.util.List;

import javax.xml.namespace.QName;

import org.xml.sax.Locator;

/**
 * Interface that represents WSDL concepts that
 * can have extensions.
 *
 * @author Vivek Pandey
 * @author Kohsuke Kawaguchi
 */
public interface WSDLExtensible extends WSDLObject {
    /**
     * Gets all the {@link WSDLExtension}s
     * added through {@link #addExtension(WSDLExtension)}.
     *
     * @return
     *      never null.
     */
    Iterable getExtensions();

    /**
     * Gets all the extensions that is assignable to the given type.
     *
     * 
     * This allows clients to find specific extensions in a type-safe
     * and convenient way.
     *
     * @param type
     *      The type of the extension to obtain. Must not be null.
     *
     * @return
     *      Can be an empty fromjava.collection but never null.
     */
     Iterable getExtensions(Class type);

    /**
     * Gets the extension that is assignable to the given type.
     *
     * 

     * This is just a convenient version that does
     *
     * 
     * Iterator itr = getExtensions(type);
     * if(itr.hasNext())  return itr.next();
     * else               return null;
     * 
     *
     * @return
     *      null if the extension was not found.
     */
     T getExtension(Class type);

    /**
     * Adds a new {@link WSDLExtension}
     * to this object.
     *
     * @param extension
     *      must not be null.
     */
    void addExtension(WSDLExtension extension);
    
    /**
     * True if all required WSDL extensions on Port and Binding are understood
     * @return true if all wsdl required extensions on Port and Binding are understood
     */
    boolean areRequiredExtensionsUnderstood();
    
    /**
     * Marks extension as not understood
     * @param extnEl QName of extension
     * @param locator Locator
     */
    void addNotUnderstoodExtension(QName extnEl, Locator locator);
    
    /**
     * Lists extensions marked as not understood
     * @return List of not understood extensions
     */
    List getNotUnderstoodExtensions();
}