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1 /*******************************************************************************
2  * Copyright (c) 2009, 2018 Mountainminds GmbH & Co. KG and Contributors
3  * All rights reserved. This program and the accompanying materials
4  * are made available under the terms of the Eclipse Public License v1.0
5  * which accompanies this distribution, and is available at
6  * http://www.eclipse.org/legal/epl-v10.html
7  *
8  * Contributors:
9  *    Marc R. Hoffmann - initial API and implementation
10  *
11  *******************************************************************************/
12 package org.jacoco.core.data;
13 
14 import static java.lang.Math.max;
15 import static java.lang.Math.min;
16 
17 import java.util.ArrayList;
18 import java.util.Collections;
19 import java.util.List;
20 
21 /**
22  * Container to collect and merge session {@link SessionInfo} objects. A
23  * instance of this class is not thread safe.
24  */
25 public class SessionInfoStore implements ISessionInfoVisitor {
26 
27 	private final List<SessionInfo> infos = new ArrayList<SessionInfo>();
28 
29 	/**
30 	 * Tests whether the store is empty.
31 	 *
32 	 * @return <code>true</code> if the store is empty
33 	 */
isEmpty()34 	public boolean isEmpty() {
35 		return infos.isEmpty();
36 	}
37 
38 	/**
39 	 * Returns all {@link SessionInfo} objects currently contained in the store.
40 	 * The info objects are ordered by its natural ordering (i.e. by the dump
41 	 * time stamp).
42 	 *
43 	 * @return list of stored {@link SessionInfo} objects
44 	 */
getInfos()45 	public List<SessionInfo> getInfos() {
46 		final List<SessionInfo> copy = new ArrayList<SessionInfo>(infos);
47 		Collections.sort(copy);
48 		return copy;
49 	}
50 
51 	/**
52 	 * Returns a new session info with the given id that contains a merged
53 	 * version from all contained version. The start timestamp is the minimum of
54 	 * all contained sessions, the dump timestamp the maximum of all contained
55 	 * sessions. If no session is currently contained both timestamps are set to
56 	 * <code>0</code>.
57 	 *
58 	 * @param id
59 	 *            identifier for the merged session info
60 	 * @return new {@link SessionInfo} object
61 	 *
62 	 */
getMerged(final String id)63 	public SessionInfo getMerged(final String id) {
64 		if (infos.isEmpty()) {
65 			return new SessionInfo(id, 0, 0);
66 		}
67 		long start = Long.MAX_VALUE;
68 		long dump = Long.MIN_VALUE;
69 		for (final SessionInfo i : infos) {
70 			start = min(start, i.getStartTimeStamp());
71 			dump = max(dump, i.getDumpTimeStamp());
72 		}
73 		return new SessionInfo(id, start, dump);
74 	}
75 
76 	/**
77 	 * Writes all contained {@link SessionInfo} objects into the given visitor.
78 	 * The info objects are emitted in chronological order by dump timestamp.
79 	 *
80 	 * @param visitor
81 	 *            visitor to emit {@link SessionInfo} objects to
82 	 */
accept(final ISessionInfoVisitor visitor)83 	public void accept(final ISessionInfoVisitor visitor) {
84 		for (final SessionInfo i : getInfos()) {
85 			visitor.visitSessionInfo(i);
86 		}
87 	}
88 
89 	// === ISessionInfoVisitor ===
90 
visitSessionInfo(final SessionInfo info)91 	public void visitSessionInfo(final SessionInfo info) {
92 		infos.add(info);
93 	}
94 
95 }
96