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Java > Open Source Codes > org > apache > fop > layoutmgr > LMiter


1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * 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
18 /* $Id: LMiter.java 426576 2006-07-28 15:44:37Z jeremias $ */
19
20 package org.apache.fop.layoutmgr;
21
22 import java.util.List JavaDoc;
23 import java.util.ListIterator JavaDoc;
24 import java.util.NoSuchElementException JavaDoc;
25
26 public class LMiter implements ListIterator JavaDoc {
27
28
29     protected List JavaDoc listLMs;
30     protected int curPos = 0;
31     /** The LayoutManager to which this LMiter is attached **/
32     private LayoutManager lp;
33
34     public LMiter(LayoutManager lp) {
35         this.lp = lp;
36         listLMs = lp.getChildLMs();
37     }
38
39     public boolean hasNext() {
40         return (curPos < listLMs.size()) ? true : lp.createNextChildLMs(curPos);
41     }
42
43     public boolean hasPrevious() {
44         return (curPos > 0);
45     }
46
47     public Object JavaDoc previous() throws NoSuchElementException JavaDoc {
48         if (curPos > 0) {
49             return listLMs.get(--curPos);
50         } else {
51             throw new NoSuchElementException JavaDoc();
52         }
53     }
54
55     public Object JavaDoc next() throws NoSuchElementException JavaDoc {
56         if (curPos < listLMs.size()) {
57             return listLMs.get(curPos++);
58         } else {
59             throw new NoSuchElementException JavaDoc();
60         }
61     }
62
63     public void remove() throws NoSuchElementException JavaDoc {
64         if (curPos > 0) {
65             listLMs.remove(--curPos);
66             // Note: doesn't actually remove it from the base!
67 } else {
68             throw new NoSuchElementException JavaDoc();
69         }
70     }
71
72
73     public void add(Object JavaDoc o) throws UnsupportedOperationException JavaDoc {
74         throw new UnsupportedOperationException JavaDoc("LMiter doesn't support add");
75     }
76
77     public void set(Object JavaDoc o) throws UnsupportedOperationException JavaDoc {
78         throw new UnsupportedOperationException JavaDoc("LMiter doesn't support set");
79     }
80
81     public int nextIndex() {
82         return curPos;
83     }
84
85     public int previousIndex() {
86         return curPos - 1;
87     }
88
89 }
90
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