adding ERXThreadStorageAppender.

Contributions coming from SourceForge. http://wonder.svn.sourceforge.net/wonder/?rev=12080&view=rev

Frameworks/Core/ERExtensions/Sources/er/extensions/logging/ERXThreadStorageAppender.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) NetStruxr, Inc. All rights reserved.
+ *
+ * This software is published under the terms of the NetStruxr 
+ * Public Software License version 0.5, a copy of which has been
+ * included with this distribution in the LICENSE.NPL file.  */
+package er.extensions.logging;
+
+import org.apache.log4j.AppenderSkeleton;
+import org.apache.log4j.spi.LoggingEvent;
+
+import er.extensions.appserver.ERXSession;
+import er.extensions.foundation.ERXThreadStorage;
+
+/**
+ * Appends all logging in this thread to thread storage if ERXSession.session()
+ * is set. In case of an exception (or whenever you want to), you can call
+ * <code>ERXThreadStorageAppender.messages()</code> to get the full log. <br>
+ * This is useful because you don't clutter up your log with stuff you don't
+ * really need most of the time, but still get full logging in case something
+ * bad happens.
+ * 
+ * @author ak
+ */
+
+public class ERXThreadStorageAppender extends AppenderSkeleton {
+
+	public void append(LoggingEvent event) {
+		if (ERXSession.session() != null) {
+			StringBuffer buf = buffer();
+			//buf.append(getLayout().format(event));
+		}
+	}
+
+	protected static StringBuffer buffer() {
+		StringBuffer buf = (StringBuffer) ERXThreadStorage.valueForKey("ERXThreadStorageAppender.buffer");
+		if(buf == null) {
+			buf = new StringBuffer();
+			ERXThreadStorage.takeValueForKey(buf, "ERXThreadStorageAppender.buffer");
+		}
+		return buf;
+	}
+
+	public void close() {
+		// nothing
+	}
+
+	public static String message() {
+		return buffer().toString();
+	}
+
+	public boolean requiresLayout() {
+		return true;
+	}
+}