de.christofreichardt.diagnosis.io.NullPrintStream Maven / Gradle / Ivy

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A trace tool which produces clearly arranged logs by indenting the trace messages depending on the depth of the call stack.
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package de.christofreichardt.diagnosis.io;

import java.io.OutputStream;
import java.util.Locale;

/**
 * The tracer classes return such a NullPrintStream when the current state and the configuration demands that no output should be written. This is equivalent to a redirection to /dev/null.
 *
 * @author Christof Reichardt
 */
final public class NullPrintStream extends IndentablePrintStream {

  public NullPrintStream() {
    super(new NullOutputStream());
  }
  
  @Override
  public IndentablePrintStream printIndent(String s) {
    return this;
  }

  @Override
  public IndentablePrintStream printIndentln(String s) {
    return this;
  }

  @Override
  public IndentablePrintStream printIndentString() {
    return this;
  }

  @Override
  public Indentable printfIndentln(String format, Object... args) {
    return this;
  }

  /**
   * Pseudo append()-method.
   *
   * @param csq won't be evaluated
   * @return this indentable print stream
   */
  @Override
  public IndentablePrintStream append(CharSequence csq) {
    return this;
  }

  /**
   * Pseudo append()-method.
   *
   * @param csq won't be evaluated
   * @param start won't be evaluated
   * @param end won't be evaluated
   * @return this indentable print stream
   */
  @Override
  public IndentablePrintStream append(CharSequence csq, int start, int end) {
    return this;
  }

  /**
   * Pseudo append()-method.
   *
   * @param c won't be evaluated
   * @return this indentable print stream
   */
  @Override
  public IndentablePrintStream append(char c) {
    return this;
  }

  /**
   * Pseudo clearError()-method.
   */
  @Override
  protected void clearError()
  {
  }
  
  /**
   * Indicates always no error.
   *
   * @return always false
   */
  @Override
  public boolean checkError() {
    return false;
  }

  /**
   * Pseudo format()-method.
   *
   * @param l won't be evaluated
   * @param format won't be evaluated
   * @param args won't be evaluated
   * @return this indentable print stream
   */
  @Override
  public IndentablePrintStream format(Locale l, String format, Object... args) {
    return this;
  }

  /**
   * Pseudo format()-method.
   *
   * @param format won't be evaluated
   * @param args won't be evaluated
   * @return this indentable print stream
   */
  @Override
  public IndentablePrintStream format(String format, Object... args) {
    return this;
  }

  /**
   * Pseudo print()-method.
   *
   * @param s won't be evaluated
   */
  @Override
  public void print(char[] s) {
  }

  /**
   * Pseudo print()-method.
   *
   * @param obj won't be evaluated
   */
  @Override
  public void print(Object obj) {
  }

  /**
   * Pseudo print()-method.
   *
   * @param c won't be evaluated
   */
  @Override
  public void print(char c) {
  }

  /**
   * Pseudo print()-method.
   *
   * @param i won't be evaluated
   */
  @Override
  public void print(int i) {
  }

  /**
   * Pseudo print()-method.
   *
   * @param s won't be evaluated
   */
  @Override
  public void print(String s) {
  }

  /**
   * Pseudo print()-method.
   *
   * @param b won't be evaluated
   */
  @Override
  public void print(boolean b) {
  }

  /**
   * Pseudo print()-method.
   *
   * @param l won't be evaluated
   */
  @Override
  public void print(long l) {
  }

  /**
   * Pseudo print()-method.
   *
   * @param d won't be evaluated
   */
  @Override
  public void print(double d) {
  }

  /**
   * Pseudo print()-method.
   *
   * @param f won't be evaluated
   */
  @Override
  public void print(float f) {
  }

  /**
   * Pseudo printf()-method.
   *
   * @param l won't be evaluated
   * @param format won't be evaluated
   * @param args won't be evaluated
   * @return this indentable print stream
   */
  @Override
  public IndentablePrintStream printf(Locale l, String format, Object... args) {
    return this;
  }

  /**
   * Pseudo printf()-method.
   *
   * @param format won't be evaluated
   * @param args won't be evaluated
   * @return this indentable print stream
   */
  @Override
  public IndentablePrintStream printf(String format, Object... args) {
    return this;
  }

  /**
   * Pseudo println()-method.
   *
   * @param x won't be evaluated
   */
  @Override
  public void println(char[] x) {
  }

  /**
   * Pseudo println()-method.
   *
   */
  @Override
  public void println() {
  }

  /**
   * Pseudo println()-method.
   *
   * @param x won't be evaluated
   */
  @Override
  public void println(Object x) {
  }

  /**
   * Pseudo println()-method.
   *
   * @param x won't be evaluated
   */
  @Override
  public void println(char x) {
  }

  /**
   * Pseudo println()-method.
   *
   * @param x won't be evaluated
   */
  @Override
  public void println(int x) {
  }

  /**
   * Pseudo println()-method.
   *
   * @param x won't be evaluated
   */
  @Override
  public void println(String x) {
  }

  /**
   * Pseudo println()-method.
   *
   * @param x won't be evaluated
   */
  @Override
  public void println(boolean x) {
  }

  /**
   * Pseudo println()-method.
   *
   * @param x won't be evaluated
   */
  @Override
  public void println(long x) {
  }

  /**
   * Pseudo println()-method.
   *
   * @param x won't be evaluated
   */
  @Override
  public void println(double x) {
  }

  /**
   * Pseudo println()-method.
   *
   * @param x won't be evaluated
   */
  @Override
  public void println(float x) {
  }

  /**
   * Pseudo setError()-method.
   */
  @Override
  protected void setError() {
  }

  /**
   * Pseudo write()-method.
   *
   * @param b won't be evaluated
   */
  @Override
  public void write(int b) {
  }

  /**
   * Pseudo write()-method.
   *
   * @param buf won't be evaluated
   * @param off won't be evaluated
   * @param len won't be evaluated
   */
  @Override
  public void write(byte[] buf, int off, int len) {
  }

  /**
   * Pseudo write()-method.
   *
   * @param b won't be evaluated
   */
  @Override
  public void write(byte[] b) {
  }

  /**
   * Pseudo flush()-method.
   */
  @Override
  public void flush() {
  }

  /**
   * Closes the underlying IndentablePrintStream.
   */
  @Override
  public void close() {
    super.close();
  }
}