configurator/src/main/java/org/apache/felix/configurator/impl/logger/StdOutLogger.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.felix.configurator.impl.logger;

import java.io.PrintStream;

import org.osgi.service.log.LogService;

/**
 * This logger logs to std out / err
 */
class StdOutLogger implements InternalLogger {

    @Override
    public void log(final int level, final String message, final Throwable ex) {
        // output depending on level
        final PrintStream out = ( level == LogService.LOG_ERROR )? System.err: System.out;

        // level as a string
        final StringBuilder buf = new StringBuilder();
        switch (level)  {
            case ( LogService.LOG_DEBUG ):
                buf.append( "[DEBUG] " );
                break;
            case ( LogService.LOG_INFO ):
                buf.append( "[INFO] " );
                break;
            case ( LogService.LOG_WARNING ):
                buf.append( "[WARN] " );
                break;
            case ( LogService.LOG_ERROR ):
                buf.append( "[ERROR] " );
                break;
            default:
                buf.append( "[UNK] " );
                break;
        }

        buf.append(message);

        final String msg = buf.toString();

        if ( ex == null ) {
            out.println(msg);
        } else {
            // keep the message and the stacktrace together
            synchronized ( out ) {
                out.println( msg );
                ex.printStackTrace( out );
            }
        }
    }
}