Catch all exceptions when processing an FCP command.
[Sone.git] / src / main / java / net / pterodactylus / sone / text / PartContainer.java
1 /*
2  * Sone - PartContainer.java - Copyright © 2010–2012 David Roden
3  *
4  * This program is free software: you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation, either version 3 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
16  */
17
18 package net.pterodactylus.sone.text;
19
20 import java.util.ArrayDeque;
21 import java.util.ArrayList;
22 import java.util.Deque;
23 import java.util.Iterator;
24 import java.util.List;
25 import java.util.NoSuchElementException;
26
27 /**
28  * Part implementation that can contain an arbitrary amount of other parts.
29  * Parts are added using the {@link #add(Part)} method and will be rendered in
30  * the order they are added.
31  *
32  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
33  */
34 public class PartContainer implements Part, Iterable<Part> {
35
36         /** The parts to render. */
37         private final List<Part> parts = new ArrayList<Part>();
38
39         //
40         // ACCESSORS
41         //
42
43         /**
44          * Adds a part to render.
45          *
46          * @param part
47          *            The part to add
48          */
49         public void add(Part part) {
50                 parts.add(part);
51         }
52
53         /**
54          * Returns the part at the given index.
55          *
56          * @param index
57          *            The index of the part
58          * @return The part
59          */
60         public Part getPart(int index) {
61                 return parts.get(index);
62         }
63
64         /**
65          * Removes the part at the given index.
66          *
67          * @param index
68          *            The index of the part to remove
69          */
70         public void removePart(int index) {
71                 parts.remove(index);
72         }
73
74         /**
75          * Returns the number of parts.
76          *
77          * @return The number of parts
78          */
79         public int size() {
80                 return parts.size();
81         }
82
83         //
84         // PART METHODS
85         //
86
87         /**
88          * {@inheritDoc}
89          */
90         @Override
91         public String getText() {
92                 StringBuilder partText = new StringBuilder();
93                 for (Part part : parts) {
94                         partText.append(part.getText());
95                 }
96                 return partText.toString();
97         }
98
99         //
100         // ITERABLE METHODS
101         //
102
103         /**
104          * {@inheritDoc}
105          */
106         @Override
107         @SuppressWarnings("synthetic-access")
108         public Iterator<Part> iterator() {
109                 return new Iterator<Part>() {
110
111                         private Deque<Iterator<Part>> partStack = new ArrayDeque<Iterator<Part>>();
112                         private Part nextPart;
113                         private boolean foundNextPart;
114                         private boolean noNextPart;
115
116                         {
117                                 partStack.push(parts.iterator());
118                         }
119
120                         private void findNext() {
121                                 if (foundNextPart) {
122                                         return;
123                                 }
124                                 noNextPart = true;
125                                 while (!partStack.isEmpty()) {
126                                         Iterator<Part> parts = partStack.pop();
127                                         if (parts.hasNext()) {
128                                                 nextPart = parts.next();
129                                                 partStack.push(parts);
130                                                 if (nextPart instanceof PartContainer) {
131                                                         partStack.push(((PartContainer) nextPart).iterator());
132                                                 } else {
133                                                         noNextPart = false;
134                                                         break;
135                                                 }
136                                         }
137                                 }
138                                 foundNextPart = true;
139                         }
140
141                         @Override
142                         public boolean hasNext() {
143                                 findNext();
144                                 return !noNextPart;
145                         }
146
147                         @Override
148                         public Part next() {
149                                 findNext();
150                                 if (noNextPart) {
151                                         throw new NoSuchElementException();
152                                 }
153                                 foundNextPart = false;
154                                 return nextPart;
155                         }
156
157                         @Override
158                         public void remove() {
159                                 /* ignore. */
160                         }
161
162                 };
163         }
164
165 }