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package java.util.logging;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

@SuppressWarnings("WeakerAccess")
public class LogRecord implements Serializable {
	private static final int MAJOR = 1;
	private static final int MINOR = 4;
	private static long currentSequenceNumber = 0;
	private static ThreadLocal currentThreadId = new ThreadLocal();
	private static int initThreadId = 0;

	private Level level;
	private long sequenceNumber;
	private String sourceClassName;
	private String sourceMethodName;
	private String message;
	private int threadID;
	private long millis;
	private Throwable thrown;
	private String loggerName;
	private String resourceBundleName;

	private transient ResourceBundle resourceBundle;
	private transient Object[] parameters;
	private transient boolean sourceInitialized;

	public LogRecord(Level level, String msg) {
		if (level == null) throw new NullPointerException("level == null");
		this.level = level;
		this.message = msg;
		this.millis = System.currentTimeMillis();

		synchronized (LogRecord.class) {
			this.sequenceNumber = currentSequenceNumber++;
			Integer id = currentThreadId.get();
			if (id == null) {
				this.threadID = initThreadId;
				currentThreadId.set(initThreadId++);
			} else {
				this.threadID = id;
			}
		}

		this.sourceClassName = null;
		this.sourceMethodName = null;
		this.loggerName = null;
		this.parameters = null;
		this.resourceBundle = null;
		this.resourceBundleName = null;
		this.thrown = null;
	}

	public Level getLevel() {
		return level;
	}

	public void setLevel(Level level) {
		if (level == null) throw new NullPointerException("level == null");
		this.level = level;
	}

	public String getLoggerName() {
		return loggerName;
	}

	public void setLoggerName(String loggerName) {
		this.loggerName = loggerName;
	}

	public String getMessage() {
		return message;
	}

	public void setMessage(String message) {
		this.message = message;
	}

	public long getMillis() {
		return millis;
	}

	public void setMillis(long millis) {
		this.millis = millis;
	}

	public Object[] getParameters() {
		return parameters;
	}

	public void setParameters(Object[] parameters) {
		this.parameters = parameters;
	}

	public ResourceBundle getResourceBundle() {
		return resourceBundle;
	}

	public void setResourceBundle(ResourceBundle resourceBundle) {
		this.resourceBundle = resourceBundle;
	}

	public String getResourceBundleName() {
		return resourceBundleName;
	}

	public void setResourceBundleName(String resourceBundleName) {
		this.resourceBundleName = resourceBundleName;
	}

	public long getSequenceNumber() {
		return sequenceNumber;
	}

	public void setSequenceNumber(long sequenceNumber) {
		this.sequenceNumber = sequenceNumber;
	}

	public String getSourceClassName() {
		initSource();
		return sourceClassName;
	}

	private void initSource() {
		if (sourceInitialized) return;

		boolean sawLogger = false;
		for (StackTraceElement element : new Throwable().getStackTrace()) {
			String current = element.getClassName();
			if (current.startsWith(Logger.class.getName())) {
				sawLogger = true;
			} else if (sawLogger) {
				this.sourceClassName = element.getClassName();
				this.sourceMethodName = element.getMethodName();
				break;
			}
		}

		sourceInitialized = true;
	}

	public void setSourceClassName(String sourceClassName) {
		sourceInitialized = true;
		this.sourceClassName = sourceClassName;
	}

	public String getSourceMethodName() {
		initSource();
		return sourceMethodName;
	}

	public void setSourceMethodName(String sourceMethodName) {
		sourceInitialized = true;
		this.sourceMethodName = sourceMethodName;
	}

	public int getThreadID() {
		return threadID;
	}

	public void setThreadID(int threadID) {
		this.threadID = threadID;
	}

	public Throwable getThrown() {
		return thrown;
	}

	public void setThrown(Throwable thrown) {
		this.thrown = thrown;
	}

	private void writeObject(ObjectOutputStream out) throws IOException {
		out.defaultWriteObject();
		out.writeByte(MAJOR);
		out.writeByte(MINOR);
		if (parameters == null) {
			out.writeInt(-1);
		} else {
			out.writeInt(parameters.length);
			for (Object element : parameters) {
				out.writeObject((element == null) ? null : element.toString());
			}
		}
	}

	private void readObject(ObjectInputStream in) throws IOException,
		ClassNotFoundException {
		in.defaultReadObject();
		byte major = in.readByte();
		byte minor = in.readByte();
		// only check MAJOR version
		if (major != MAJOR) {
			throw new IOException("Different version " + major + "." + minor);
		}

		int length = in.readInt();
		if (length >= 0) {
			parameters = new Object[length];
			for (int i = 0; i < parameters.length; i++) {
				parameters[i] = in.readObject();
			}
		}
		if (resourceBundleName != null) {
			try {
				resourceBundle = Logger.loadResourceBundle(resourceBundleName);
			} catch (MissingResourceException e) {
				// Cannot find the specified resource bundle
				resourceBundle = null;
			}
		}
	}
}