--- /dev/null
+/*
+ * Copyright (C) 2001-2006 The Mir-coders group
+ *
+ * This file is part of Mir.
+ *
+ * Mir is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Mir is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Mir; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * In addition, as a special exception, The Mir-coders gives permission to link
+ * the code of this program with any library licensed under the Apache Software License,
+ * and distribute linked combinations including the two. You must obey the
+ * GNU General Public License in all respects for all of the code used other than
+ * the above mentioned libraries. If you modify this file, you may extend this
+ * exception to your version of the file, but you are not obligated to do so.
+ * If you do not wish to do so, delete this exception statement from your version.
+ */
+
+package mir.changetracker;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Date;
+import java.util.Calendar;
+
+/**
+ * Change tracker, tracks changes to a path based repository.
+ * All methods are thread-safe
+ */
+
+public class ChangeTracker {
+ private final List changes = new ArrayList();
+ private Calendar calendar = Calendar.getInstance();
+
+ // to prevent memory issues with the number of recorded changes,
+ // we'll adhere to this maximum
+ private static final int MAX_CHANGES = 10000;
+
+ /**
+ * Add a single change. A change is represented by the full path
+ * of the file involved.
+ */
+ public void addChange(String aPath, ChangeType aChangeType) {
+ synchronized (changes) {
+ changes.add(new Change(aPath, aChangeType, calendar.getTime()));
+ }
+ }
+
+ /**
+ * Add an array of changes. Each change is represented by the full path
+ * of the file involved.
+ */
+ public void addChanges(String[] aPaths, ChangeType aChangeType) {
+ addChanges(Arrays.asList(aPaths), aChangeType);
+ }
+
+ /**
+ * Adds a <code>Collection</code> of changes. Each change is represented by the
+ * full path of the file involved.
+ */
+ public void addChanges(Collection aChanges, ChangeType aChangeType) {
+ synchronized (changes) {
+ Iterator i = aChanges.iterator();
+ while (i.hasNext()) {
+ addChange((String) i.next(), aChangeType);
+ }
+ }
+ }
+
+ public class Change {
+ private ChangeType type;
+ private String path;
+ private Date date;
+
+ Change(String anAbsolutePath, ChangeType aType, Date aDate) {
+ type = aType;
+ path = anAbsolutePath;
+ date = aDate;
+ }
+
+ public String getPath() {
+ return path;
+ }
+
+ public ChangeType getType() {
+ return type;
+ }
+
+ public Date getDate() {
+ return date;
+ }
+
+ }
+
+ /**
+ * Returns a <code>Collection</code> of {@link Change}s within a base
+ * path, and removes them from the tracker.
+ */
+ public Collection flushChanges(String aBasePath) {
+ return flushChanges(aBasePath, Collections.EMPTY_LIST);
+ }
+
+ /**
+ * Returns a <code>Collection</code> of {@link Change}s within a base
+ * path, exluding a list of excluded paths, and removes them from
+ * the tracker.
+ */
+ public Collection flushChanges(String aBasePath, Collection anExcludedPaths) {
+ synchronized (changes) {
+ Collection result = getChanges(aBasePath, anExcludedPaths);
+
+ removeChanges(result);
+
+ return result;
+ }
+ }
+
+ /**
+ * Remove specific changes from the change tracker.
+ *
+ * @param someChanges a <code>Collection</code> of changes represented by
+ * their full path in the form of a <code>String</code>
+ */
+ void removeChanges(Collection someChanges) {
+ synchronized (changes) {
+ changes.removeAll(someChanges);
+ }
+ }
+
+ /**
+ * Returns all changes within a base path
+ */
+ List getChanges(String aBasePath) {
+ synchronized (changes) {
+ List result = new ArrayList();
+
+ Iterator i = changes.iterator();
+ while (i.hasNext()) {
+ Change change = (Change) i.next();
+ if (change.getPath().startsWith(aBasePath)) {
+ result.add(change);
+ }
+ }
+
+ return result;
+ }
+ }
+
+ /**
+ * Gets all changes within a base path, but excluding some other paths
+ *
+ * @param aBasePath
+ * @param anExcludedPaths a collection of paths to exclude. may be <code>null</code>
+ * to not exclude anything
+ */
+ Collection getChanges(String aBasePath, Collection anExcludedPaths) {
+ synchronized (changes) {
+ List result = getChanges(aBasePath);
+
+ if (anExcludedPaths != null) {
+ Iterator i = anExcludedPaths.iterator();
+ while (i.hasNext()) {
+ String excludedPath = (String) i.next();
+ List remove = new ArrayList();
+ Iterator j = result.iterator();
+ while (j.hasNext()) {
+ Change change = (Change) j.next();
+ if (change.getPath().startsWith(excludedPath)) {
+ remove.add(change);
+ }
+ }
+ result.removeAll(remove);
+ }
+ }
+
+ if (changes.size()>MAX_CHANGES) {
+ changes.clear();
+ }
+
+ return result;
+ }
+ }
+}
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projects / mir.git / blobdiff