1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
/*
* Copyright 2004-2005 The Apache Software Foundation.
*
* Licensed 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
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.layoutmgr;
import java.util.ArrayList;
/**
* Represents a list of Knuth elements.
*/
public class KnuthSequence extends ArrayList {
/** Number of elements to ignore at the beginning of the list. */
public int ignoreAtStart = 0;
/** Number of elements to ignore at the end of the list. */
public int ignoreAtEnd = 0;
// Is this an inline or a block sequence?
private boolean isInlineSequence = false;
/**
* Creates a new and empty list.
*/
public KnuthSequence() {
super();
}
/**
* Creates a new and empty list, and sets isInlineSequence.
*/
public KnuthSequence(boolean isInlineSequence) {
super();
this.isInlineSequence = isInlineSequence;
}
/**
* Marks the start of the sequence.
*/
public void startSequence() {
}
/**
* Finalizes a Knuth sequence.
* @return a finalized sequence.
*/
public KnuthSequence endSequence() {
return endSequence(null);
}
/**
* Finalizes a Knuth sequence.
* @param breakPosition a Position instance for the last penalty (may be null)
* @return a finalized sequence.
*/
public KnuthSequence endSequence(Position breakPosition) {
// remove glue and penalty item at the end of the paragraph
while (this.size() > ignoreAtStart
&& !((KnuthElement)this.get(this.size() - 1)).isBox()) {
this.remove(this.size() - 1);
}
if (this.size() > ignoreAtStart) {
// add the elements representing the space at the end of the last line
// and the forced break
this.add(new KnuthPenalty(0, KnuthElement.INFINITE, false, null, false));
this.add(new KnuthGlue(0, 10000000, 0, null, false));
this.add(new KnuthPenalty(0, -KnuthElement.INFINITE, false, breakPosition, false));
ignoreAtEnd = 3;
return this;
} else {
this.clear();
return null;
}
}
public KnuthElement getLast() {
int idx = size();
if (idx == 0) {
return null;
}
return (KnuthElement) get(idx - 1);
}
public KnuthElement removeLast() {
int idx = size();
if (idx == 0) {
return null;
}
return (KnuthElement) remove(idx - 1);
}
public KnuthElement getElement(int index) {
return (KnuthElement) get(index);
}
/**
* Is this an inline or a block sequence?
* @return true if this is an inline sequence
*/
public boolean isInlineSequence() {
return isInlineSequence;
}
}
|
