Examples of java.util.logging.StreamHandler

java.util.logging.StreamHandler
Stream based logging Handler.
This is primarily intended as a base class or support class to be used in implementing other logging Handlers.
LogRecords are published to a given java.io.OutputStream.
Configuration: By default each StreamHandler is initialized using the following LogManager configuration properties. If properties are not defined (or have invalid values) then the specified default values are used.
- java.util.logging.StreamHandler.level specifies the default level for the Handler (defaults to Level.INFO).
- java.util.logging.StreamHandler.filter specifies the name of a Filter class to use (defaults to no Filter).
- java.util.logging.StreamHandler.formatter specifies the name of a Formatter class to use (defaults to java.util.logging.SimpleFormatter).
- java.util.logging.StreamHandler.encoding the name of the character set encoding to use (defaults to the default platform encoding).
@version 1.19, 11/17/05 @since 1.4

   */
  public void testClose_InsufficientPrivilege() {
    SecurityManager oldMan = System.getSecurityManager();
    System.setSecurityManager(new MockSecurityManager());
    try {
      StreamHandler h = new StreamHandler(new ByteArrayOutputStream(),
          new MockFormatter());
      h.close();
      fail("Should throw SecurityException!");
    } catch (SecurityException e) {
      // expected
    } finally {
      System.setSecurityManager(oldMan);

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  /*
   * Test close() when having no output stream.
   */
  public void testClose_NoOutputStream() {
    StreamHandler h = new StreamHandler();
    h.close();
  }

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  /*
   * Test flush().
   */
  public void testFlush_Normal() {
    ByteArrayOutputStream aos = new MockOutputStream();
    StreamHandler h = new StreamHandler(aos, new MockFormatter());
    h.flush();
    assertEquals("flush", CallVerificationStack.getInstance()
        .getCurrentSourceMethod());
    assertNull(CallVerificationStack.getInstance().pop());
    CallVerificationStack.getInstance().clear();
  }

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  /*
   * Test flush() when having no output stream.
   */
  public void testFlush_NoOutputStream() {
    StreamHandler h = new StreamHandler();
    h.flush();
  }

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  /*
   * Test isLoggable(), use no filter, having output stream
   */
  public void testIsLoggable_NoOutputStream() {
    StreamHandler h = new StreamHandler();
    LogRecord r = new LogRecord(Level.INFO, null);
    assertFalse(h.isLoggable(r));


    h.setLevel(Level.WARNING);
    assertFalse(h.isLoggable(r));


    h.setLevel(Level.CONFIG);
    assertFalse(h.isLoggable(r));


    r.setLevel(Level.OFF);
    h.setLevel(Level.OFF);
    assertFalse(h.isLoggable(r));
  }

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  /*
   * Test isLoggable(), use no filter, having output stream
   */
  public void testIsLoggable_NoFilter() {
    StreamHandler h = new StreamHandler(new ByteArrayOutputStream(),
        new SimpleFormatter());
    LogRecord r = new LogRecord(Level.INFO, null);
    assertTrue(h.isLoggable(r));


    h.setLevel(Level.WARNING);
    assertFalse(h.isLoggable(r));


    h.setLevel(Level.CONFIG);
    assertTrue(h.isLoggable(r));


    r.setLevel(Level.OFF);
    h.setLevel(Level.OFF);
    assertFalse(h.isLoggable(r));
  }

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  /*
   * Test isLoggable(), use a filter, having output stream
   */
  public void testIsLoggable_WithFilter() {
    StreamHandler h = new StreamHandler(new ByteArrayOutputStream(),
        new SimpleFormatter());
    LogRecord r = new LogRecord(Level.INFO, null);
    h.setFilter(new MockFilter());
    assertFalse(h.isLoggable(r));
    assertSame(r, CallVerificationStack.getInstance().pop());


    h.setLevel(Level.CONFIG);
    assertFalse(h.isLoggable(r));
    assertSame(r, CallVerificationStack.getInstance().pop());


    h.setLevel(Level.WARNING);
    assertFalse(h.isLoggable(r));
    assertTrue(CallVerificationStack.getInstance().empty());
  }

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  /*
   * Test isLoggable(), null log record, having output stream. Handler should
   * call ErrorManager to handle exceptional case
   */
  public void testIsLoggable_Null() {
    StreamHandler h = new StreamHandler(new ByteArrayOutputStream(),
        new SimpleFormatter());
    assertFalse(h.isLoggable(null));
  }

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  /*
   * Test isLoggable(), null log record, without output stream
   */
  public void testIsLoggable_Null_NoOutputStream() {
    StreamHandler h = new StreamHandler();
    assertFalse(h.isLoggable(null));
  }

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  /*
   * Test publish(), use no filter, having output stream, normal log record.
   */
  public void testPublish_NoOutputStream() {
    StreamHandler h = new StreamHandler();
    LogRecord r = new LogRecord(Level.INFO, "testPublish_NoOutputStream");
    h.publish(r);


    h.setLevel(Level.WARNING);
    h.publish(r);


    h.setLevel(Level.CONFIG);
    h.publish(r);


    r.setLevel(Level.OFF);
    h.setLevel(Level.OFF);
    h.publish(r);
  }

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