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The Pax Logging API Library is to allow for the Pax Logging Service to be reloaded without stopping the many dependent bundles. It also contains the OSGi Log Service API and the Knopflerfish Log API.
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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.logging.log4j.message;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.text.MessageFormat;
import java.util.Arrays;
import java.util.IllegalFormatException;

import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.status.StatusLogger;

/**
 * Handles messages that consist of a format string conforming to java.text.MessageFormat.
 *
 * @serial In version 2.1, due to a bug in the serialization format, the serialization format was changed along with
 * its {@code serialVersionUID} value.
 */
public class MessageFormatMessage implements Message {

    private static final Logger LOGGER = StatusLogger.getLogger();

    private static final long serialVersionUID = 1L;

    private static final int HASHVAL = 31;

    private String messagePattern;
    private transient Object[] parameters;
    private String[] serializedParameters;
    private transient String formattedMessage;
    private transient Throwable throwable;

    public MessageFormatMessage(final String messagePattern, final Object... parameters) {
        this.messagePattern = messagePattern;
        this.parameters = parameters;
        final int length = parameters == null ? 0 : parameters.length;
        if (length > 0 && parameters[length - 1] instanceof Throwable) {
            this.throwable = (Throwable) parameters[length - 1];
        }
    }

    /**
     * Returns the formatted message.
     * @return the formatted message.
     */
    @Override
    public String getFormattedMessage() {
        if (formattedMessage == null) {
            formattedMessage = formatMessage(messagePattern, parameters);
        }
        return formattedMessage;
    }

    /**
     * Returns the message pattern.
     * @return the message pattern.
     */
    @Override
    public String getFormat() {
        return messagePattern;
    }

    /**
     * Returns the message parameters.
     * @return the message parameters.
     */
    @Override
    public Object[] getParameters() {
        if (parameters != null) {
            return parameters;
        }
        return serializedParameters;
    }

    protected String formatMessage(final String msgPattern, final Object... args) {
        try {
            return MessageFormat.format(msgPattern, args);
        } catch (final IllegalFormatException ife) {
            LOGGER.error("Unable to format msg: " + msgPattern, ife);
            return msgPattern;
        }
    }

    @Override
    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        final MessageFormatMessage that = (MessageFormatMessage) o;

        if (messagePattern != null ? !messagePattern.equals(that.messagePattern) : that.messagePattern != null) {
            return false;
        }
        return Arrays.equals(serializedParameters, that.serializedParameters);
    }

    @Override
    public int hashCode() {
        int result = messagePattern != null ? messagePattern.hashCode() : 0;
        result = HASHVAL * result + (serializedParameters != null ? Arrays.hashCode(serializedParameters) : 0);
        return result;
    }


    @Override
    public String toString() {
        return "StringFormatMessage[messagePattern=" + messagePattern + ", args=" +
            Arrays.toString(parameters) + ']';
    }

    private void writeObject(final ObjectOutputStream out) throws IOException {
        getFormattedMessage();
        out.writeUTF(formattedMessage);
        out.writeUTF(messagePattern);
        final int length = parameters == null ? 0 : parameters.length;
        out.writeInt(length);
        serializedParameters = new String[length];
        if (length > 0) {
            for (int i = 0; i < length; i++) {
                serializedParameters[i] = String.valueOf(parameters[i]);
                out.writeUTF(serializedParameters[i]);
            }
        }
    }

    private void readObject(final ObjectInputStream in) throws IOException {
        parameters = null;
        throwable = null;
        formattedMessage = in.readUTF();
        messagePattern = in.readUTF();
        final int length = in.readInt();
        serializedParameters = new String[length];
        for (int i = 0; i < length; ++i) {
            serializedParameters[i] = in.readUTF();
        }
    }

    /**
     * Return the throwable passed to the Message.
     *
     * @return the Throwable.
     */
    @Override
    public Throwable getThrowable() {
        return throwable;
    }
}