log4j-1.2-api/src/main/java/org/apache/log4j/or/ThreadGroupRenderer.java

/*
 * 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;

/**
 */
public class ThreadGroupRenderer implements ObjectRenderer {

    public
    String  doRender(Object obj) {
        if(obj instanceof ThreadGroup) {
            StringBuilder sb = new StringBuilder();
            ThreadGroup threadGroup = (ThreadGroup) obj;
            sb.append("java.lang.ThreadGroup[name=");
            sb.append(threadGroup.getName());
            sb.append(", maxpri=");
            sb.append(threadGroup.getMaxPriority());
            sb.append("]");
            Thread[] threads = new Thread[threadGroup.activeCount()];
            threadGroup.enumerate(threads);
            for (Thread thread : threads) {
                sb.append(Layout.LINE_SEP);
                sb.append("   Thread=[");
                sb.append(thread.getName());
                sb.append(",");
                sb.append(thread.getPriority());
                sb.append(",");
                sb.append(thread.isDaemon());
                sb.append("]");
            }
            return sb.toString();
        } else {
            try {
                // this is the best we can do
                return obj.toString();
            } catch(Exception ex) {
                return ex.toString();
            }
        }
    }
}