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/**
 * Copyright (C) 2014 Couchbase, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALING
 * IN THE SOFTWARE.
 */
/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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 com.couchbase.client.core.logging;

import org.slf4j.LoggerFactory;
import org.slf4j.helpers.NOPLoggerFactory;

import java.io.OutputStream;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;

/**
 * Logger factory which creates a SLF4J
 * logger.
 */
public class Slf4JLoggerFactory extends CouchbaseLoggerFactory {

    public Slf4JLoggerFactory() {
    }

    Slf4JLoggerFactory(boolean failIfNOP) {
        assert failIfNOP; // Should be always called with true.

        // SFL4J writes it error messages to System.err. Capture them so that the user does not see such a message on
        // the console during automatic detection.
        final StringBuffer buf = new StringBuffer();
        final PrintStream err = System.err;
        try {
            System.setErr(new PrintStream(new OutputStream() {
                @Override
                public void write(int b) {
                    buf.append((char) b);
                }
            }, true, "US-ASCII"));
        } catch (UnsupportedEncodingException e) {
            throw new Error(e);
        }

        try {
            if (LoggerFactory.getILoggerFactory() instanceof NOPLoggerFactory) {
                throw new NoClassDefFoundError(buf.toString());
            } else {
                err.print(buf);
                err.flush();
            }
        } finally {
            System.setErr(err);
        }
    }

    @Override
    public CouchbaseLogger newInstance(String name) {
        return new Slf4JLogger(LoggerFactory.getLogger(name));
    }
}