/*
 * Copyright (c) 2000, 2017 Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2021 Contributors to the Eclipse Foundation
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

/*
 * @(#)StreamLogHandler.java	1.8 06/29/07
 */

package com.sun.messaging.jmq.util.log;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Properties;

/**
 * A LogHandler that is implemented as a simple OutputStream (For example System.err)
 */
public class StreamLogHandler extends LogHandler {

    private OutputStream os = null;

    /**
     * Configure the StreamLogHandler with the values contained in the passed Properties object. This handler's properties
     * are prefixed with the specified prefix.
     * <P>
     * An example of valid properties are:
     *
     * <PRE>
     * jmq.log.console.stream=ERR
     * jmq.log.console.output=ERROR|WARNING|INFO
     * </PRE>
     *
     * In this case prefix would be "jmq.log.stream"
     *
     * @param props Properties to get configuration information from
     * @param prefix String that this handler's properties are prefixed with
     *
     * @throws IllegalArgumentException if one or more property values are invalid. All valid properties will still be set.
     */
    @Override
    public void configure(Properties props, String prefix) throws IllegalArgumentException {

        String value = null;
        String property = null;
        String error_msg = null;

        prefix = prefix + ".";

        property = prefix + "stream";
        if ((value = props.getProperty(property)) != null) {
            if (value.equals("ERR")) {
                setLogStream(System.err);
            } else if (value.equals("OUT")) {
                setLogStream(System.out);
            } else {
                error_msg = rb.getString(rb.W_BAD_LOGSTREAM, property, value);
            }
        }

        property = prefix + "output";
        if ((value = props.getProperty(property)) != null) {
            try {
                setLevels(value);
            } catch (IllegalArgumentException e) {
                error_msg = (error_msg != null ? error_msg + rb.NL : "") + property + ": " + e.getMessage();
            }
        }

        if (error_msg != null) {
            throw new IllegalArgumentException(error_msg);

        }
    }

    public void setLogStream(OutputStream os) {
        close();
        this.os = os;
    }

    /**
     * Publish string to log
     *
     * @param level Log level to use
     * @param message Message to write to log file
     *
     */
    @Override
    public void publish(int level, String message) throws IOException {

        // ignore FORCE messages if we have explicitly been asked to ignore them
        if (level == Logger.FORCE && !isAllowForceMessage()) {
            return;
        }

        if (os != null) {
            os.write(message.getBytes());
        }
    }

    /**
     * Open handler. This is a no-op. It is assumed the stream is already opened.
     */
    @Override
    public void open() throws IOException {
        return;
    }

    /**
     * Close handler. This just flushes the output stream.
     */
    @Override
    public void close() {
        if (os != null) {
            try {
                os.flush();
            } catch (IOException e) {
            }
        }
    }

    /**
     * This just flushes the output stream.
     */
    @Override
    public void flush() {
        if (os != null) {
            try {
                os.flush();
            } catch (IOException e) {
            }
        }
    }

    /**
     * Return a string description of this FileHandler. The descirption is the class name followed by the path of the file
     * we are logging to.
     */
    @Override
    public String toString() {
        return this.getClass().getName() + ":" + os.toString();
    }
}
