1 files changed, 169 insertions, 0 deletions
diff --git a/bundles/org.eclipse.equinox.cm/src/org/eclipse/equinox/internal/cm/LogTracker.java b/bundles/org.eclipse.equinox.cm/src/org/eclipse/equinox/internal/cm/LogTracker.java
new file mode 100644
index 000000000..d13db9e81
--- /dev/null
+++ b/bundles/org.eclipse.equinox.cm/src/org/eclipse/equinox/internal/cm/LogTracker.java
@@ -0,0 +1,169 @@
+/*******************************************************************************
+ * Copyright (c) 1998, 2007 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.eclipse.equinox.internal.cm;
+
+import java.io.PrintStream;
+import java.util.Calendar;
+import java.util.Date;
+
+import org.osgi.framework.BundleContext;
+import org.osgi.framework.ServiceReference;
+import org.osgi.service.log.LogService;
+import org.osgi.util.tracker.ServiceTracker;
+
+/**
+ * LogTracker class. This class encapsulates the LogService
+ * and handles all issues such as the service coming and going.
+ */
+
+public class LogTracker extends ServiceTracker implements LogService {
+	/** LogService interface class name */
+	protected final static String clazz = "org.osgi.service.log.LogService"; //$NON-NLS-1$
+
+	/** PrintStream to use if LogService is unavailable */
+	private final PrintStream out;
+
+	/**
+	 * Create new LogTracker.
+	 *
+	 * @param context BundleContext of parent bundle.
+	 * @param out Default PrintStream to use if LogService is unavailable.
+	 */
+	public LogTracker(BundleContext context, PrintStream out) {
+		super(context, clazz, null);
+		this.out = out;
+	}
+
+	/*
+	 * ----------------------------------------------------------------------
+	 *      LogService Interface implementation
+	 * ----------------------------------------------------------------------
+	 */
+
+	public void log(int level, String message) {
+		log(null, level, message, null);
+	}
+
+	public void log(int level, String message, Throwable exception) {
+		log(null, level, message, exception);
+	}
+
+	public void log(ServiceReference reference, int level, String message) {
+		log(reference, level, message, null);
+	}
+
+	public synchronized void log(ServiceReference reference, int level, String message, Throwable exception) {
+		ServiceReference[] references = getServiceReferences();
+
+		if (references != null) {
+			int size = references.length;
+
+			for (int i = 0; i < size; i++) {
+				LogService service = (LogService) getService(references[i]);
+				if (service != null) {
+					try {
+						service.log(reference, level, message, exception);
+					} catch (Exception e) {
+						// TODO: consider printing to System Error
+					}
+				}
+			}
+
+			return;
+		}
+
+		noLogService(level, message, exception, reference);
+	}
+
+	/**
+	 * The LogService is not available so we write the message to a PrintStream.
+	 *
+	 * @param level Logging level
+	 * @param message Log message.
+	 * @param throwable Log exception or null if none.
+	 * @param reference ServiceReference associated with message or null if none.
+	 */
+	protected void noLogService(int level, String message, Throwable throwable, ServiceReference reference) {
+		if (out != null) {
+			synchronized (out) {
+				// Bug #113286.  If no log service present and messages are being
+				// printed to stdout, prepend message with a timestamp.
+				String timestamp = getDate(new Date());
+				out.print(timestamp + " "); //$NON-NLS-1$
+
+				switch (level) {
+					case LOG_DEBUG : {
+						out.print("Debug"); //$NON-NLS-1$
+						break;
+					}
+					case LOG_INFO : {
+						out.print("Info"); //$NON-NLS-1$
+						break;
+					}
+					case LOG_WARNING : {
+						out.print("Warning"); //$NON-NLS-1$
+						break;
+					}
+					case LOG_ERROR : {
+						out.print("Error"); //$NON-NLS-1$
+						break;
+					}
+					default : {
+						out.print("["); //$NON-NLS-1$
+						out.print("Unknown Log Level"); //$NON-NLS-1$
+						out.print("]"); //$NON-NLS-1$
+						break;
+					}
+				}
+				out.print(": "); //$NON-NLS-1$
+				out.println(message);
+
+				if (reference != null) {
+					out.println(reference);
+				}
+
+				if (throwable != null) {
+					throwable.printStackTrace(out);
+				}
+			}
+		}
+	}
+
+	// from EclipseLog to avoid using DateFormat -- see bug 149892#c10
+	private String getDate(Date date) {
+		Calendar c = Calendar.getInstance();
+		c.setTime(date);
+		StringBuffer sb = new StringBuffer();
+		appendPaddedInt(c.get(Calendar.YEAR), 4, sb).append('-');
+		appendPaddedInt(c.get(Calendar.MONTH) + 1, 2, sb).append('-');
+		appendPaddedInt(c.get(Calendar.DAY_OF_MONTH), 2, sb).append(' ');
+		appendPaddedInt(c.get(Calendar.HOUR_OF_DAY), 2, sb).append(':');
+		appendPaddedInt(c.get(Calendar.MINUTE), 2, sb).append(':');
+		appendPaddedInt(c.get(Calendar.SECOND), 2, sb).append('.');
+		appendPaddedInt(c.get(Calendar.MILLISECOND), 3, sb);
+		return sb.toString();
+	}
+
+	private StringBuffer appendPaddedInt(int value, int pad, StringBuffer buffer) {
+		pad = pad - 1;
+		if (pad == 0)
+			return buffer.append(Integer.toString(value));
+		int padding = (int) Math.pow(10, pad);
+		if (value >= padding)
+			return buffer.append(Integer.toString(value));
+		while (padding > value && padding > 1) {
+			buffer.append('0');
+			padding = padding / 10;
+		}
+		buffer.append(value);
+		return buffer;
+	}
+}