+/*
+ * Copyright (C) 2001, 2002 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,
+ * The Sun (tm) Java Advanced Imaging library (JAI), The Sun JIMI library
+ * (or with modified versions of the above that use the same license as the above),
+ * 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;
+
+/**
+ * Change tracker, tracks changes to a path based repository.
+ * All methods are thread-safe
+ */
+
+public class ChangeTracker {
+ private List changes;
+
+ public ChangeTracker() {
+ changes = new ArrayList();
+ }
+
+ /**
+ * Adds a single change
+ */
+ public void addChange(String aPath) {
+ synchronized (changes) {
+ changes.add(aPath);
+ }
+ }
+
+ /**
+ * Adds an array of changes
+ */
+ public void addChanges(String[] aPaths) {
+ addChanges(Arrays.asList(aPaths));
+ }
+
+ /**
+ * Adds a <code>List</code> of changes
+ */
+ public void addChanges(List aChanges) {
+ synchronized (changes) {
+ changes.addAll(aChanges);
+ }
+ }
+
+ /**
+ * Returns changes within a base path, and removes them from the
+ * tracker.
+ */
+ public List flushChanges(String aBasePath) {
+ return flushChanges(aBasePath, new String[0]);
+ }
+
+ /**
+ * Returns changes within a base path, and removes them from the
+ * tracker.
+ */
+ public List flushChanges(String aBasePath, String[] anExcludedPaths) {
+ synchronized (changes) {
+ List result = getChanges(aBasePath, anExcludedPaths);
+
+ clearChanges(result);
+
+ return result;
+ }
+ }
+
+ /**
+ * Removes changes from the tracker
+ */
+ public void clearChanges(List aChanges) {
+ synchronized (changes) {
+ changes.removeAll(aChanges);
+ }
+ }
+
+ /**
+ * Returns all changes within a base path
+ */
+ public List getChanges(String aBasePath) {
+ synchronized (changes) {
+ List result = new ArrayList();
+
+ Iterator i = changes.iterator();
+ while (i.hasNext()) {
+ String change = (String) i.next();
+ if (change.startsWith(aBasePath))
+ result.add(change);
+ }
+
+ return result;
+ }
+ }
+
+ /**
+ * gets all changes within a base path, but excluding some other paths
+ */
+ public List getChanges(String aBasePath, String[] anExcludingPaths) {
+ synchronized (changes) {
+ List result = getChanges(aBasePath);
+
+ for (int i=0; i<anExcludingPaths.length && result.size()>0; i++) {
+ List remove = new ArrayList();
+ Iterator j = result.iterator();
+ while (j.hasNext()) {
+ String item = (String) j.next();
+ if (item.startsWith(anExcludingPaths[i])) {
+ remove.add(item);
+ }
+ }
+ result.removeAll(remove);
+ }
+
+ return result;
+ }
+ }
+}
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