[EGIT PATCH 04/11] Add new class ExceptionCollector for grouping exceptions

["Tor Arne Vestbø" <torarnv@gmail.com>]

Copied from org.eclipse.team.internal.core

Signed-off-by: Tor Arne Vestbø <torarnv@gmail.com>
---
 org.spearce.egit.core/META-INF/MANIFEST.MF         |    5 +-
 .../core/internal/util/ExceptionCollector.java     |  128 ++++++++++++++++++++
 2 files changed, 131 insertions(+), 2 deletions(-)
 create mode 100644 org.spearce.egit.core/src/org/spearce/egit/core/internal/util/ExceptionCollector.java

diff --git a/org.spearce.egit.core/META-INF/MANIFEST.MF b/org.spearce.egit.core/META-INF/MANIFEST.MF
index e13732b..20df15f 100644
--- a/org.spearce.egit.core/META-INF/MANIFEST.MF
+++ b/org.spearce.egit.core/META-INF/MANIFEST.MF
@@ -12,8 +12,9 @@ Require-Bundle: org.eclipse.core.runtime,
  org.spearce.jgit,
  org.eclipse.core.filesystem,
  org.eclipse.ui
-Export-Package: org.spearce.egit.core.internal.storage;x-friends:="org.spearce.egit.ui",
- org.spearce.egit.core,
+Export-Package: org.spearce.egit.core,
+ org.spearce.egit.core.internal.storage;x-friends:="org.spearce.egit.ui",
+ org.spearce.egit.core.internal.util;x-friends:="org.spearce.egit.ui",
  org.spearce.egit.core.op,
  org.spearce.egit.core.project
 Bundle-ActivationPolicy: lazy
diff --git a/org.spearce.egit.core/src/org/spearce/egit/core/internal/util/ExceptionCollector.java b/org.spearce.egit.core/src/org/spearce/egit/core/internal/util/ExceptionCollector.java
new file mode 100644
index 0000000..d99d651
--- /dev/null
+++ b/org.spearce.egit.core/src/org/spearce/egit/core/internal/util/ExceptionCollector.java
@@ -0,0 +1,128 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2006 IBM Corporation 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:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.spearce.egit.core.internal.util;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.ILog;
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.MultiStatus;
+import org.eclipse.core.runtime.Status;
+
+/**
+ * Collects exceptions and can be configured to ignore duplicates exceptions.
+ * Exceptions can be logged and a MultiStatus containing all collected
+ * exceptions can be returned.
+ * 
+ * @see org.eclipse.core.runtime.MultiStatus
+ * @see org.eclipse.core.runtime.IStatus
+ * 
+ * @since 3.0
+ */
+public class ExceptionCollector {
+
+	private final List<IStatus> statuses = new ArrayList<IStatus>();
+
+	private final String message;
+
+	private final String pluginId;
+
+	private final int severity;
+
+	private final ILog log;
+
+	/**
+	 * Creates a collector and initializes the parameters for the top-level
+	 * exception that would be returned from <code>getStatus</code> is
+	 * exceptions are collected.
+	 * 
+	 * @param message
+	 *            a human-readable message, localized to the current locale
+	 * @param pluginId
+	 *            the unique identifier of the relevant plug-in
+	 * @param severity
+	 *            the severity; one of <code>OK</code>, <code>ERROR</code>,
+	 *            <code>INFO</code>, or <code>WARNING</code>
+	 * @param log
+	 *            the log to output the exceptions to, or <code>null</code> if
+	 *            exceptions should not be logged.
+	 */
+	public ExceptionCollector(String message, String pluginId, int severity,
+			ILog log) {
+		this.message = message;
+		this.pluginId = pluginId;
+		this.severity = severity;
+		this.log = log;
+	}
+
+	/**
+	 * Clears the exceptions collected.
+	 */
+	public void clear() {
+		statuses.clear();
+	}
+
+	/**
+	 * Returns a status that represents the exceptions collected. If the
+	 * collector is empty <code>IStatus.OK</code> is returned. Otherwise a
+	 * MultiStatus containing all collected exceptions is returned.
+	 * 
+	 * @return a multistatus containing the exceptions collected or IStatus.OK
+	 *         if the collector is empty.
+	 */
+	public IStatus getStatus() {
+		if (statuses.isEmpty()) {
+			return Status.OK_STATUS;
+		} else {
+			final MultiStatus multiStatus = new MultiStatus(pluginId, severity,
+					message, null);
+			final Iterator it = statuses.iterator();
+			while (it.hasNext()) {
+				final IStatus status = (IStatus) it.next();
+				multiStatus.merge(status);
+			}
+			return multiStatus;
+		}
+	}
+
+	/**
+	 * Add this exception to the collector. If a log was specified in the
+	 * constructor then the exception will be output to the log. You can
+	 * retreive exceptions using <code>getStatus</code>.
+	 * 
+	 * @param exception
+	 *            the exception to collect
+	 */
+	public void handleException(CoreException exception) {
+		if (log != null) {
+			log.log(new Status(severity, pluginId, 0, message, exception));
+		}
+
+		// Record each status individually to flatten the resulting multi-status
+		final IStatus exceptionStatus = exception.getStatus();
+
+		// Wrap the exception so the stack trace is not lost.
+		final IStatus status = new Status(exceptionStatus.getSeverity(),
+				exceptionStatus.getPlugin(), exceptionStatus.getCode(),
+				exceptionStatus.getMessage(), exception);
+
+		recordStatus(status);
+		for (IStatus childStatus : status.getChildren())
+			recordStatus(childStatus);
+	}
+
+	private void recordStatus(IStatus status) {
+		statuses.add(status);
+	}
+}
-- 
1.6.1.2.309.g2ea3