1 files changed, 111 insertions, 0 deletions
diff --git a/org.eclipse.mylyn.tasks.search/src/org/eclipse/mylyn/internal/tasks/ui/search/StackTraceDuplicateDetector.java b/org.eclipse.mylyn.tasks.search/src/org/eclipse/mylyn/internal/tasks/ui/search/StackTraceDuplicateDetector.java
new file mode 100644
index 000000000..12af40934
--- /dev/null
+++ b/org.eclipse.mylyn.tasks.search/src/org/eclipse/mylyn/internal/tasks/ui/search/StackTraceDuplicateDetector.java
@@ -0,0 +1,111 @@
+/*******************************************************************************
+ * Copyright (c) 2004, 2008 Tasktop Technologies and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Tasktop Technologies - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.mylyn.internal.tasks.ui.search;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.Status;
+import org.eclipse.mylyn.internal.tasks.core.AbstractSearchHandler;
+import org.eclipse.mylyn.internal.tasks.ui.TasksUiPlugin;
+import org.eclipse.mylyn.tasks.core.AbstractDuplicateDetector;
+import org.eclipse.mylyn.tasks.core.IRepositoryQuery;
+import org.eclipse.mylyn.tasks.core.TaskRepository;
+import org.eclipse.mylyn.tasks.core.data.TaskAttribute;
+import org.eclipse.mylyn.tasks.core.data.TaskData;
+import org.eclipse.mylyn.tasks.ui.TasksUi;
+
+/**
+ * @author Gail Murphy
+ * @author Steffen Pingel
+ */
+public class StackTraceDuplicateDetector extends AbstractDuplicateDetector {
+
+	@Override
+	public boolean canQuery(TaskData taskData) {
+		return TasksUiPlugin.getDefault().getSearchHandler(taskData.getConnectorKind()) != null;
+	}
+
+	private String getDescription(TaskData taskData) {
+		TaskAttribute attribute = taskData.getRoot().getMappedAttribute(TaskAttribute.DESCRIPTION);
+		if (attribute == null) {
+			attribute = taskData.getRoot().getMappedAttribute(TaskAttribute.COMMENT_NEW);
+		}
+		return (attribute != null) ? attribute.getTaskData().getAttributeMapper().getValueLabel(attribute) : ""; //$NON-NLS-1$
+	}
+
+	@Override
+	public IRepositoryQuery getDuplicatesQuery(TaskRepository taskRepository, TaskData taskData) throws CoreException {
+		String description = getDescription(taskData);
+		String searchString = getStackTraceFromDescription(description);
+		if (searchString == null) {
+			throw new CoreException(new Status(IStatus.INFO, TasksUiPlugin.ID_PLUGIN,
+					"Unable to locate a stack trace in the description text.")); //$NON-NLS-1$
+		}
+
+		IRepositoryQuery query = TasksUi.getRepositoryModel().createRepositoryQuery(taskRepository);
+		AbstractSearchHandler searchHandler = TasksUiPlugin.getDefault().getSearchHandler(
+				taskRepository.getConnectorKind());
+		if (searchHandler.queryForText(taskRepository, query, taskData, searchString)) {
+			return query;
+		}
+		return null;
+	}
+
+	public static String getStackTraceFromDescription(String description) {
+		String stackTrace = null;
+
+		if (description == null) {
+			return null;
+		}
+
+		String punct = "!\"#$%&'\\(\\)*+,-./:;\\<=\\>?@\\[\\]^_`\\{|\\}~\n"; //$NON-NLS-1$
+		String lineRegex = " *at\\s+[\\w" + punct + "]+ ?\\(.*\\) *\n?"; //$NON-NLS-1$ //$NON-NLS-2$
+		Pattern tracePattern = Pattern.compile(lineRegex);
+		Matcher match = tracePattern.matcher(description);
+
+		if (match.find()) {
+			// record the index of the first stack trace line
+			int start = match.start();
+			int lastEnd = match.end();
+
+			// find the last stack trace line
+			while (match.find()) {
+				lastEnd = match.end();
+			}
+
+			// make sure there's still room to find the exception
+			if (start <= 0) {
+				return null;
+			}
+
+			// count back to the line before the stack trace to find the
+			// exception
+			int stackStart = 0;
+			int index = start - 1;
+			while (index > 1 && description.charAt(index) == ' ') {
+				index--;
+			}
+
+			// locate the exception line index
+			stackStart = description.substring(0, index - 1).lastIndexOf("\n"); //$NON-NLS-1$
+			stackStart = (stackStart == -1) ? 0 : stackStart + 1;
+
+			stackTrace = description.substring(stackStart, lastEnd);
+		}
+
+		return stackTrace;
+	}
+
+}