+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.log4j.or;
+
+import org.apache.log4j.Layout;
+
+
+/**
+ Render {@link ThreadGroup} objects in a format similar to the
+ information output by the {@link ThreadGroup#list} method.
+ @author Ceki Gülcü
+ @since 1.0 */
+public class ThreadGroupRenderer implements ObjectRenderer {
+
+ public
+ ThreadGroupRenderer() {
+ }
+
+ /**
+ Render a {@link ThreadGroup} object similar to the way that the
+ {@link ThreadGroup#list} method output information.
+
+ <p>The output of a simple program consisting of one
+ <code>main</code> thread is:
+ <pre>
+ java.lang.ThreadGroup[name=main, maxpri=10]
+ Thread=[main,5,false]
+ </pre>
+
+ <p>The boolean value in thread information is the value returned
+ by {@link Thread#isDaemon}.
+
+ */
+ public
+ String doRender(Object o) {
+ if(o instanceof ThreadGroup) {
+ StringBuffer sbuf = new StringBuffer();
+ ThreadGroup tg = (ThreadGroup) o;
+ sbuf.append("java.lang.ThreadGroup[name=");
+ sbuf.append(tg.getName());
+ sbuf.append(", maxpri=");
+ sbuf.append(tg.getMaxPriority());
+ sbuf.append("]");
+ Thread[] t = new Thread[tg.activeCount()];
+ tg.enumerate(t);
+ for(int i = 0; i < t.length; i++) {
+ sbuf.append(Layout.LINE_SEP);
+ sbuf.append(" Thread=[");
+ sbuf.append(t[i].getName());
+ sbuf.append(",");
+ sbuf.append(t[i].getPriority());
+ sbuf.append(",");
+ sbuf.append(t[i].isDaemon());
+ sbuf.append("]");
+ }
+ return sbuf.toString();
+ } else {
+ try {
+ // this is the best we can do
+ return o.toString();
+ } catch(Exception ex) {
+ return ex.toString();
+ }
+ }
+ }
+}