com.sun.xml.rpc.wsdl.framework.ExtensibilityHelper Maven / Gradle / Ivy

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/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package com.sun.xml.rpc.wsdl.framework;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;

/**
 * A helper class for extensible entities.
 *
 * @author JAX-RPC Development Team
 */
public class ExtensibilityHelper {

    public ExtensibilityHelper() {
    }

    public void addExtension(Extension e) {
        if (_extensions == null) {
            _extensions = new ArrayList();
        }
        _extensions.add(e);
    }

    public Iterator extensions() {
        if (_extensions == null) {
            return new Iterator() {
                public boolean hasNext() {
                    return false;
                }

                public Object next() {
                    throw new NoSuchElementException();
                }

                public void remove() {
                    throw new UnsupportedOperationException();
                }
            };
        } else {
            return _extensions.iterator();
        }
    }

    public void withAllSubEntitiesDo(EntityAction action) {
        if (_extensions != null) {
            for (Iterator iter = _extensions.iterator(); iter.hasNext();) {
                action.perform((Entity) iter.next());
            }
        }
    }

    public void accept(ExtensionVisitor visitor) throws Exception {
        if (_extensions != null) {
            for (Iterator iter = _extensions.iterator(); iter.hasNext();) {
                ((Extension) iter.next()).accept(visitor);
            }
        }
    }

    private List _extensions;
}