01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17: package org.apache.xerces.xs.datatypes;
18:
19: /**
20: * <p>The <code>ObjectList</code> is an immutable ordered collection of
21: * <code>Object</code>.</p>
22: *
23: * @author Ankit Pasricha, IBM
24: *
25: * @version $Id: ObjectList.java 447250 2006-09-18 05:27:17Z mrglavas $
26: */
27: public interface ObjectList {
28:
29: /**
30: * The number of <code>Object</code>s in the list. The range of
31: * valid child object indices is 0 to <code>length-1</code> inclusive.
32: */
33: public int getLength();
34:
35: /**
36: * Checks if the <code>Object</code> <code>item</code> is a
37: * member of this list.
38: * @param item <code>Object</code> whose presence in this list
39: * is to be tested.
40: * @return True if this list contains the <code>Object</code>
41: * <code>item</code>.
42: */
43: public boolean contains(Object item);
44:
45: /**
46: * Returns the <code>index</code>th item in the collection or
47: * <code>null</code> if <code>index</code> is greater than or equal to
48: * the number of objects in the list. The index starts at 0.
49: * @param index index into the collection.
50: * @return The <code>Object</code> at the <code>index</code>th
51: * position in the <code>ObjectList</code>, or <code>null</code> if
52: * the index specified is not valid - greater than or equal to the
53: * number of items in the list or less than zero.
54: */
55: public Object item(int index);
56:
57: }
|