jaxp/src/java.xml/share/classes/com/sun/org/apache/xerces/internal/xs/XSObjectList.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
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package com.sun.org.apache.xerces.internal.xs;

import java.util.List;

/**
 *  The <code>XSObjectList</code> interface provides the abstraction of an
 * immutable ordered collection of <code>XSObject</code>s, without defining
 * or constraining how this collection is implemented.
 */
public interface XSObjectList extends List {
    /**
     *  The number of <code>XSObjects</code> in the list. The range of valid
     * child object indices is 0 to <code>length-1</code> inclusive.
     */
    public int getLength();

    /**
     *  Returns the <code>index</code>th item in the collection or
     * <code>null</code> if <code>index</code> is greater than or equal to
     * the number of objects in the list. The index starts at 0.
     * @param index  index into the collection.
     * @return  The <code>XSObject</code> at the <code>index</code>th
     *   position in the <code>XSObjectList</code>, or <code>null</code> if
     *   the index specified is not valid.
     */
    public XSObject item(int index);

}