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


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: KnuthPossPosIter.java 426576 2006-07-28 15:44:37Z jeremias $ */
19
20 package org.apache.fop.layoutmgr;
21
22 import java.util.List JavaDoc;
23
24 public class KnuthPossPosIter extends PositionIterator {
25
26     private int iterCount;
27
28     /**
29      * Main constructor
30      * @param elementList List of Knuth elements
31      * @param startPos starting position
32      * @param endPos ending position
33      */
34     public KnuthPossPosIter(List JavaDoc elementList, int startPos, int endPos) {
35         super(elementList.listIterator(startPos));
36         iterCount = endPos - startPos;
37     }
38     
39     /**
40      * Auxiliary constructor
41      * @param elementList List of Knuth elements
42      */
43     public KnuthPossPosIter(List JavaDoc elementList) {
44         this(elementList, 0, elementList.size());
45     }
46
47     // Check position < endPos
48
49     /**
50      * @see org.apache.fop.layoutmgr.PositionIterator#checkNext()
51      */
52     protected boolean checkNext() {
53         if (iterCount > 0) {
54             return super.checkNext();
55         } else {
56             endIter();
57             return false;
58         }
59     }
60
61     /**
62      * @see java.util.Iterator#next()
63      */
64     public Object JavaDoc next() {
65         --iterCount;
66         return super.next();
67     }
68
69     public ListElement getKE() {
70         return (ListElement) peekNext();
71     }
72
73     protected LayoutManager getLM(Object JavaDoc nextObj) {
74         return ((ListElement) nextObj).getLayoutManager();
75     }
76
77     protected Position getPos(Object JavaDoc nextObj) {
78         return ((ListElement) nextObj).getPosition();
79     }
80 }
81
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