org.apache.lucene.util.PrintStreamInfoStream.java Source code

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Here is the source code for org.apache.lucene.util.PrintStreamInfoStream.java

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/*
 * 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.lucene.util;

import java.io.IOException;
import java.io.PrintStream;
import java.time.Instant;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * InfoStream implementation over a {@link PrintStream}
 * such as <code>System.out</code>.
 * 
 * @lucene.internal
 */
public class PrintStreamInfoStream extends InfoStream {
    // Used for printing messages
    private static final AtomicInteger MESSAGE_ID = new AtomicInteger();
    protected final int messageID;

    protected final PrintStream stream;

    public PrintStreamInfoStream(PrintStream stream) {
        this(stream, MESSAGE_ID.getAndIncrement());
    }

    public PrintStreamInfoStream(PrintStream stream, int messageID) {
        this.stream = stream;
        this.messageID = messageID;
    }

    @Override
    public void message(String component, String message) {
        stream.println(component + " " + messageID + " [" + getTimestamp() + "; " + Thread.currentThread().getName()
                + "]: " + message);
    }

    @Override
    public boolean isEnabled(String component) {
        return true;
    }

    @Override
    public void close() throws IOException {
        if (!isSystemStream()) {
            stream.close();
        }
    }

    @SuppressForbidden(reason = "System.out/err detection")
    public boolean isSystemStream() {
        return stream == System.out || stream == System.err;
    }

    /** Returns the current time as string for insertion into log messages. */
    protected String getTimestamp() {
        return Instant.now().toString();
    }
}