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1 | /******************************************************************************* |
2 | * Copyright (c) 2011-2012 Ericsson, Ecole Polytechnique de Montreal and others | |
3 | * | |
4 | * All rights reserved. This program and the accompanying materials are made | |
5 | * available under the terms of the Eclipse Public License v1.0 which | |
6 | * accompanies this distribution, and is available at | |
7 | * http://www.eclipse.org/legal/epl-v10.html | |
8 | * | |
9 | * Contributors: Matthew Khouzam - Initial API and implementation | |
10 | * Contributors: Simon Marchi - Initial API and implementation | |
11 | *******************************************************************************/ | |
12 | ||
ce2388e0 | 13 | package org.eclipse.linuxtools.internal.ctf.core.trace; |
866e5b51 | 14 | |
866e5b51 FC |
15 | import java.util.ListIterator; |
16 | import java.util.Vector; | |
17 | ||
ce2388e0 FC |
18 | import org.eclipse.linuxtools.ctf.core.trace.CTFReaderException; |
19 | ||
866e5b51 FC |
20 | /** |
21 | * <b><u>StreamInputPacketIndex</u></b> | |
22 | * <p> | |
23 | * TODO Implement me. Please. | |
24 | */ | |
25 | public class StreamInputPacketIndex { | |
26 | ||
27 | // ------------------------------------------------------------------------ | |
28 | // Attributes | |
29 | // ------------------------------------------------------------------------ | |
30 | ||
31 | /** | |
32 | * Entries of the index. They are sorted by increasing begin timestamp. | |
33 | * index builder. | |
34 | */ | |
35 | private final Vector<StreamInputPacketIndexEntry> entries = new Vector<StreamInputPacketIndexEntry>(); | |
36 | ||
37 | // ------------------------------------------------------------------------ | |
38 | // Getters/Setters/Predicates | |
39 | // ------------------------------------------------------------------------ | |
40 | ||
ce2388e0 | 41 | public Vector<StreamInputPacketIndexEntry> getEntries() { |
866e5b51 FC |
42 | return this.entries; |
43 | } | |
44 | ||
45 | public ListIterator<StreamInputPacketIndexEntry> listIterator() { | |
46 | return this.entries.listIterator(); | |
47 | } | |
48 | ||
49 | public ListIterator<StreamInputPacketIndexEntry> listIterator(int n) { | |
50 | return this.entries.listIterator(n); | |
51 | } | |
52 | ||
53 | // ------------------------------------------------------------------------ | |
54 | // Operations | |
55 | // ------------------------------------------------------------------------ | |
56 | ||
57 | /** | |
58 | * Adds an entry to the index. | |
59 | * | |
60 | * @param entry | |
61 | * The entry to add | |
62 | * @throws CTFReaderException | |
63 | */ | |
64 | public void addEntry(StreamInputPacketIndexEntry entry) | |
65 | throws CTFReaderException { | |
ce2388e0 FC |
66 | assert (entry.getContentSizeBits() != 0); |
67 | assert (entry.getContentSizeBits() != 0); | |
866e5b51 | 68 | |
ce2388e0 | 69 | if (entry.getTimestampBegin() > entry.getTimestampEnd()) { |
866e5b51 FC |
70 | throw new CTFReaderException( |
71 | "Packet begin timestamp is after end timestamp"); //$NON-NLS-1$ | |
72 | } | |
73 | ||
74 | if (!this.entries.isEmpty()) { | |
bfe038ff MK |
75 | if (entry.getTimestampBegin() < this.entries.lastElement() |
76 | .getTimestampBegin()) { | |
866e5b51 FC |
77 | throw new CTFReaderException( |
78 | "Packets begin timestamp decreasing"); //$NON-NLS-1$ | |
79 | } | |
80 | } | |
81 | ||
82 | this.entries.add(entry); | |
83 | } | |
84 | ||
85 | /** | |
86 | * Given a timestamp, this methods returns the first PacketIndexEntry that | |
87 | * could include the timestamp, that is the last packet with a begin | |
88 | * timestamp smaller than the given timestamp. | |
89 | * | |
90 | * @param timestamp | |
91 | * The timestamp to look for. | |
92 | * @return The StreamInputPacketEntry that corresponds to the packet that | |
93 | * includes the given timestamp. | |
94 | */ | |
95 | public ListIterator<StreamInputPacketIndexEntry> search(final long timestamp) { | |
96 | /* | |
97 | * Start with min and max covering all the elements. | |
98 | */ | |
99 | int max = this.entries.size() - 1; | |
100 | int min = 0; | |
101 | ||
102 | int guessI; | |
103 | StreamInputPacketIndexEntry guessEntry = null; | |
104 | ||
4a110860 AM |
105 | /* |
106 | * If the index is empty, return the iterator at the very beginning. | |
107 | */ | |
108 | if( this.getEntries().isEmpty()) { | |
109 | return this.getEntries().listIterator(); | |
110 | } | |
111 | ||
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112 | if (timestamp < 0) { |
113 | throw new IllegalArgumentException("timestamp is negative"); //$NON-NLS-1$ | |
114 | } | |
115 | ||
116 | for (;;) { | |
117 | /* | |
118 | * Guess in the middle of min and max. The +1 is so that in case | |
119 | * (min + 1 == max), we choose the packet at the subscript "max" | |
120 | * instead of the one at "min". Otherwise, it would give an infinite | |
121 | * loop. | |
122 | */ | |
123 | guessI = (max + min + 1) / 2; | |
124 | guessEntry = this.entries.get(guessI); | |
125 | ||
126 | /* | |
127 | * If we reached the point where we focus on a single packet, our | |
128 | * search is done. | |
129 | */ | |
130 | if (min == max) { | |
131 | break; | |
132 | } | |
133 | ||
ce2388e0 | 134 | if (timestamp < guessEntry.getTimestampBegin()) { |
866e5b51 FC |
135 | /* |
136 | * If the timestamp if before the begin timestamp, we know that | |
137 | * the packet to return is before the guess. | |
138 | */ | |
139 | max = guessI - 1; | |
ce2388e0 | 140 | } else if (timestamp >= guessEntry.getTimestampBegin()) { |
866e5b51 FC |
141 | /* |
142 | * If the timestamp is after the begin timestamp, we know that | |
143 | * the packet to return is after the guess or is the guess. | |
144 | */ | |
145 | min = guessI; | |
146 | } | |
147 | } | |
148 | ||
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149 | return this.entries.listIterator(guessI); |
150 | } | |
866e5b51 | 151 | } |