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a52fde77 | 1 | /******************************************************************************* |
11252342 | 2 | * Copyright (c) 2012, 2013 Ericsson |
a52fde77 AM |
3 | * Copyright (c) 2010, 2011 École Polytechnique de Montréal |
4 | * Copyright (c) 2010, 2011 Alexandre Montplaisir <alexandre.montplaisir@gmail.com> | |
8d1346f0 | 5 | * |
a52fde77 AM |
6 | * All rights reserved. This program and the accompanying materials are |
7 | * made available under the terms of the Eclipse Public License v1.0 which | |
8 | * accompanies this distribution, and is available at | |
9 | * http://www.eclipse.org/legal/epl-v10.html | |
8d1346f0 | 10 | * |
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11 | *******************************************************************************/ |
12 | ||
18ab1d18 | 13 | package org.eclipse.linuxtools.internal.tmf.core.statesystem; |
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14 | |
15 | import java.io.*; | |
16 | import java.util.ArrayList; | |
17 | import java.util.Arrays; | |
18 | import java.util.Collections; | |
19 | import java.util.List; | |
20 | ||
6d08acca | 21 | import org.eclipse.linuxtools.tmf.core.exceptions.AttributeNotFoundException; |
25e43749 AM |
22 | import org.eclipse.linuxtools.tmf.core.exceptions.StateValueTypeException; |
23 | import org.eclipse.linuxtools.tmf.core.exceptions.TimeRangeException; | |
24 | import org.eclipse.linuxtools.tmf.core.statevalue.TmfStateValue; | |
6d08acca | 25 | |
a52fde77 AM |
26 | /** |
27 | * The Attribute Tree is the /proc-like filesystem used to organize attributes. | |
28 | * Each node of this tree is both like a file and a directory in the | |
29 | * "file system". | |
8d1346f0 | 30 | * |
a52fde77 | 31 | * @author alexmont |
8d1346f0 | 32 | * |
a52fde77 | 33 | */ |
cb42195c | 34 | public final class AttributeTree { |
a52fde77 AM |
35 | |
36 | /* "Magic number" for attribute tree files or file sections */ | |
cb42195c | 37 | private static final int ATTRIB_TREE_MAGIC_NUMBER = 0x06EC3671; |
a52fde77 AM |
38 | |
39 | private final StateSystem ss; | |
40 | private final List<Attribute> attributeList; | |
41 | private final Attribute attributeTreeRoot; | |
42 | ||
43 | /** | |
44 | * Standard constructor, create a new empty Attribute Tree | |
8d1346f0 | 45 | * |
a52fde77 AM |
46 | * @param ss |
47 | * The StateSystem to which this AT is attached | |
48 | */ | |
49 | AttributeTree(StateSystem ss) { | |
50 | this.ss = ss; | |
51 | this.attributeList = Collections.synchronizedList(new ArrayList<Attribute>()); | |
52 | this.attributeTreeRoot = new AlphaNumAttribute(null, "root", -1); //$NON-NLS-1$ | |
53 | } | |
54 | ||
55 | /** | |
6f04e06c EB |
56 | * "Existing file" constructor. Builds an attribute tree from a |
57 | * "mapping file" or mapping section previously saved somewhere. | |
8d1346f0 | 58 | * |
a52fde77 AM |
59 | * @param ss |
60 | * StateSystem to which this AT is attached | |
61 | * @param fis | |
62 | * File stream where to read the AT information. Make sure it's | |
6f04e06c | 63 | * sought at the right place! |
a52fde77 AM |
64 | * @throws IOException |
65 | */ | |
66 | AttributeTree(StateSystem ss, FileInputStream fis) throws IOException { | |
67 | this(ss); | |
68 | DataInputStream in = new DataInputStream(new BufferedInputStream(fis)); | |
69 | ||
70 | /* Message for exceptions, shouldn't be externalized */ | |
71 | final String errorMessage = "The attribute tree file section is either invalid or corrupted."; //$NON-NLS-1$ | |
0a9de3d2 | 72 | |
a4524c1b | 73 | ArrayList<String[]> list = new ArrayList<>(); |
a52fde77 AM |
74 | byte[] curByteArray; |
75 | String curFullString; | |
76 | String[] curStringArray; | |
77 | int res, remain, size; | |
78 | int expectedSize = 0; | |
79 | int total = 0; | |
80 | ||
81 | /* Read the header of the Attribute Tree file (or file section) */ | |
82 | res = in.readInt(); /* Magic number */ | |
83 | if (res != ATTRIB_TREE_MAGIC_NUMBER) { | |
84 | throw new IOException(errorMessage); | |
85 | } | |
86 | ||
87 | /* Expected size of the section */ | |
88 | expectedSize = in.readInt(); | |
89 | if (expectedSize <= 12) { | |
90 | throw new IOException(errorMessage); | |
91 | } | |
92 | ||
93 | /* How many entries we have to read */ | |
94 | remain = in.readInt(); | |
95 | total += 12; | |
96 | ||
97 | /* Read each entry */ | |
98 | for (; remain > 0; remain--) { | |
99 | /* Read the first byte = the size of the entry */ | |
100 | size = in.readByte(); | |
101 | curByteArray = new byte[size]; | |
ab604305 AM |
102 | res = in.read(curByteArray); |
103 | if (res != size) { | |
104 | throw new IOException(errorMessage); | |
105 | } | |
a52fde77 AM |
106 | |
107 | /* | |
108 | * Go buffer -> byteArray -> String -> String[] -> insert in list. | |
109 | * bleh | |
110 | */ | |
111 | curFullString = new String(curByteArray); | |
112 | curStringArray = curFullString.split("/"); //$NON-NLS-1$ | |
113 | list.add(curStringArray); | |
114 | ||
115 | /* Read the 0'ed confirmation byte */ | |
116 | res = in.readByte(); | |
117 | if (res != 0) { | |
118 | throw new IOException(errorMessage); | |
119 | } | |
120 | total += curByteArray.length + 2; | |
121 | } | |
122 | ||
123 | if (total != expectedSize) { | |
124 | throw new IOException(errorMessage); | |
125 | } | |
126 | ||
127 | /* | |
128 | * Now we have 'list', the ArrayList of String arrays representing all | |
129 | * the attributes. Simply create attributes the normal way from them. | |
130 | */ | |
131 | for (String[] attrib : list) { | |
132 | this.getQuarkAndAdd(-1, attrib); | |
133 | } | |
134 | } | |
135 | ||
136 | /** | |
137 | * Tell the Attribute Tree to write itself somewhere. The passed | |
138 | * FileOutputStream defines where (which file/position). | |
8d1346f0 | 139 | * |
a52fde77 | 140 | * @param fos |
6f04e06c | 141 | * Where to write. Make sure it's sought at the right position |
a52fde77 AM |
142 | * you want. |
143 | * @return The total number of bytes written. | |
144 | */ | |
145 | int writeSelf(File file, long pos) { | |
a52fde77 AM |
146 | int total = 0; |
147 | byte[] curByteArray; | |
148 | ||
a4524c1b | 149 | try (RandomAccessFile raf = new RandomAccessFile(file, "rw");) { //$NON-NLS-1$ |
a52fde77 AM |
150 | raf.seek(pos); |
151 | ||
152 | /* Write the almost-magic number */ | |
153 | raf.writeInt(ATTRIB_TREE_MAGIC_NUMBER); | |
154 | ||
155 | /* Placeholder for the total size of the section... */ | |
156 | raf.writeInt(-8000); | |
157 | ||
158 | /* Write the number of entries */ | |
159 | raf.writeInt(this.attributeList.size()); | |
160 | total += 12; | |
161 | ||
162 | /* Write the attributes themselves */ | |
163 | for (Attribute entry : this.attributeList) { | |
164 | curByteArray = entry.getFullAttributeName().getBytes(); | |
165 | if (curByteArray.length > Byte.MAX_VALUE) { | |
166 | throw new IOException("Attribute with name \"" //$NON-NLS-1$ | |
167 | + Arrays.toString(curByteArray) + "\" is too long."); //$NON-NLS-1$ | |
168 | } | |
169 | /* Write the first byte = size of the array */ | |
170 | raf.writeByte((byte) curByteArray.length); | |
171 | ||
172 | /* Write the array itself */ | |
173 | raf.write(curByteArray); | |
174 | ||
175 | /* Write the 0'ed byte */ | |
176 | raf.writeByte((byte) 0); | |
177 | ||
178 | total += curByteArray.length + 2; | |
179 | } | |
180 | ||
181 | /* Now go back and write the actual size of this section */ | |
182 | raf.seek(pos + 4); | |
183 | raf.writeInt(total); | |
184 | ||
a52fde77 AM |
185 | } catch (IOException e) { |
186 | e.printStackTrace(); | |
187 | } | |
188 | return total; | |
189 | } | |
190 | ||
191 | /** | |
192 | * Return the number of attributes this system as seen so far. Note that | |
193 | * this also equals the integer value (quark) the next added attribute will | |
194 | * have. | |
8d1346f0 | 195 | * |
a52fde77 AM |
196 | * @return |
197 | */ | |
198 | int getNbAttributes() { | |
199 | return attributeList.size(); | |
200 | } | |
201 | ||
202 | /** | |
203 | * This is the version to specifically add missing attributes. | |
8d1346f0 | 204 | * |
a52fde77 AM |
205 | * If 'numericalNode' is true, all the new attributes created will be of |
206 | * type 'NumericalNode' instead of 'AlphaNumNode'. Be careful with this, if | |
207 | * you do not want ALL added attributes to be numerical, call this function | |
208 | * first with 'false' to create the parent nodes, then call it again to make | |
209 | * sure only the final node is numerical. | |
8d1346f0 | 210 | * |
a52fde77 AM |
211 | * @throws AttributeNotFoundException |
212 | */ | |
213 | int getQuarkDontAdd(int startingNodeQuark, String... subPath) | |
214 | throws AttributeNotFoundException { | |
a52fde77 AM |
215 | assert (startingNodeQuark >= -1); |
216 | ||
217 | Attribute prevNode; | |
218 | ||
6abc2d88 AM |
219 | /* If subPath is empty, simply return the starting quark */ |
220 | if (subPath == null || subPath.length == 0) { | |
221 | return startingNodeQuark; | |
222 | } | |
223 | ||
a52fde77 AM |
224 | /* Get the "starting node" */ |
225 | if (startingNodeQuark == -1) { | |
226 | prevNode = attributeTreeRoot; | |
227 | } else { | |
228 | prevNode = attributeList.get(startingNodeQuark); | |
229 | } | |
230 | ||
231 | int knownQuark = prevNode.getSubAttributeQuark(subPath); | |
232 | if (knownQuark == -1) { | |
233 | /* | |
234 | * The attribute doesn't exist, but we have been specified to NOT | |
235 | * add any new attributes. | |
236 | */ | |
237 | throw new AttributeNotFoundException(); | |
238 | } | |
239 | /* | |
240 | * The attribute was already existing, return the quark of that | |
241 | * attribute | |
242 | */ | |
243 | return knownQuark; | |
244 | } | |
245 | ||
246 | // FIXME synchronized here is probably quite costly... maybe only locking | |
247 | // the "for" would be enough? | |
248 | synchronized int getQuarkAndAdd(int startingNodeQuark, String... subPath) { | |
249 | assert (subPath != null && subPath.length > 0); | |
250 | assert (startingNodeQuark >= -1); | |
251 | ||
252 | Attribute nextNode = null; | |
253 | Attribute prevNode; | |
254 | ||
255 | /* Get the "starting node" */ | |
256 | if (startingNodeQuark == -1) { | |
257 | prevNode = attributeTreeRoot; | |
258 | } else { | |
259 | prevNode = attributeList.get(startingNodeQuark); | |
260 | } | |
261 | ||
262 | int knownQuark = prevNode.getSubAttributeQuark(subPath); | |
263 | if (knownQuark == -1) { | |
264 | /* | |
265 | * The attribute was not in the table previously, and we want to add | |
266 | * it | |
267 | */ | |
268 | for (String curDirectory : subPath) { | |
269 | nextNode = prevNode.getSubAttributeNode(curDirectory); | |
270 | if (nextNode == null) { | |
271 | /* This is where we need to start adding */ | |
272 | nextNode = new AlphaNumAttribute(prevNode, curDirectory, | |
273 | attributeList.size()); | |
274 | prevNode.addSubAttribute(nextNode); | |
275 | attributeList.add(nextNode); | |
8d1346f0 | 276 | ss.addEmptyAttribute(); |
a52fde77 AM |
277 | } |
278 | prevNode = nextNode; | |
279 | } | |
25e43749 AM |
280 | /* |
281 | * Insert an initial null value for this attribute in the state | |
282 | * system (in case the state provider doesn't set one). | |
283 | */ | |
284 | final int newAttrib = attributeList.size() - 1; | |
285 | try { | |
286 | ss.modifyAttribute(ss.getStartTime(), TmfStateValue.nullValue(), newAttrib); | |
287 | } catch (TimeRangeException e) { | |
288 | /* Should not happen, we're inserting at ss's start time */ | |
cb42195c | 289 | throw new IllegalStateException(e); |
25e43749 AM |
290 | } catch (AttributeNotFoundException e) { |
291 | /* Should not happen, we just created this attribute! */ | |
cb42195c | 292 | throw new IllegalStateException(e); |
25e43749 AM |
293 | } catch (StateValueTypeException e) { |
294 | /* Should not happen, there is no existing state value, and the | |
295 | * one we insert is a null value anyway. */ | |
cb42195c | 296 | throw new IllegalStateException(e); |
25e43749 AM |
297 | } |
298 | ||
299 | return newAttrib; | |
a52fde77 AM |
300 | } |
301 | /* | |
302 | * The attribute was already existing, return the quark of that | |
303 | * attribute | |
304 | */ | |
305 | return knownQuark; | |
306 | } | |
307 | ||
308 | int getSubAttributesCount(int quark) { | |
cb42195c | 309 | return attributeList.get(quark).getSubAttributes().size(); |
a52fde77 AM |
310 | } |
311 | ||
0a9de3d2 AM |
312 | /** |
313 | * Returns the sub-attributes of the quark passed in parameter | |
8d1346f0 | 314 | * |
0a9de3d2 | 315 | * @param attributeQuark |
c66426fd | 316 | * @param recursive |
0a9de3d2 AM |
317 | * @return |
318 | * @throws AttributeNotFoundException | |
319 | */ | |
c66426fd | 320 | List<Integer> getSubAttributes(int attributeQuark, boolean recursive) |
0a9de3d2 | 321 | throws AttributeNotFoundException { |
a4524c1b | 322 | List<Integer> listOfChildren = new ArrayList<>(); |
0a9de3d2 | 323 | Attribute startingAttribute; |
c66426fd | 324 | |
0a9de3d2 | 325 | /* Check if the quark is valid */ |
f94a0bac | 326 | if (attributeQuark < -1 || attributeQuark >= attributeList.size()) { |
0a9de3d2 AM |
327 | throw new AttributeNotFoundException(); |
328 | } | |
c66426fd | 329 | |
0a9de3d2 | 330 | /* Set up the node from which we'll start the search */ |
c66426fd | 331 | if (attributeQuark == -1) { |
0a9de3d2 AM |
332 | startingAttribute = attributeTreeRoot; |
333 | } else { | |
334 | startingAttribute = attributeList.get(attributeQuark); | |
335 | } | |
c66426fd | 336 | |
0a9de3d2 | 337 | /* Iterate through the sub-attributes and add them to the list */ |
c66426fd | 338 | addSubAttributes(listOfChildren, startingAttribute, recursive); |
0a9de3d2 | 339 | |
a52fde77 AM |
340 | return listOfChildren; |
341 | } | |
342 | ||
c66426fd AM |
343 | private void addSubAttributes(List<Integer> list, Attribute curAttribute, |
344 | boolean recursive) { | |
cb42195c | 345 | for (Attribute childNode : curAttribute.getSubAttributes()) { |
c66426fd AM |
346 | list.add(childNode.getQuark()); |
347 | if (recursive) { | |
348 | addSubAttributes(list, childNode, true); | |
349 | } | |
350 | } | |
351 | } | |
352 | ||
50678114 AM |
353 | String getAttributeName(int quark) { |
354 | return attributeList.get(quark).getName(); | |
355 | } | |
356 | ||
a52fde77 AM |
357 | String getFullAttributeName(int quark) { |
358 | if (quark >= attributeList.size() || quark < 0) { | |
359 | return null; | |
360 | } | |
361 | return attributeList.get(quark).getFullAttributeName(); | |
362 | } | |
363 | ||
364 | void debugPrint(PrintWriter writer) { | |
365 | attributeTreeRoot.debugPrint(writer); | |
366 | } | |
367 | ||
368 | } |