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## com.caucho.vfs
Class WriteStream

    java.lang.Object
      |
      +--java.io.OutputStream
            |
            +--com.caucho.vfs.WriteStream

public class WriteStream
extends java.io.OutputStream

A fast bufferered output stream supporting both character and byte data. The underlying stream sources are provided by StreamImpl classes, so all streams have the same API regardless of the underlying implementation.

OutputStream and Writers are combined. The `write` routines write bytes and the `print` routines write characters.

Most applications will use the Path routines to create their own streams. Specialized applications, like servers, need the capability of recycling streams.

Constructor Summary
`WriteStream()` Creates an uninitialized stream.
`WriteStream(StreamImpl source)` Creates a stream and initializes with a specified source.

Method Summary
`boolean` | `canWrite()` Returns true if the buffer allows writes.
`void` | `clearWrite()` Clears the write buffer
`void` | `close()` Close the stream, first flushing the write buffer.
`void` | `flush()` Flushes the buffer to the source.
`java.lang.Object` | `getAttribute(java.lang.String name)` Returns a named attribute.
`java.util.Iterator` | `getAttributeNames()` Lists all named attributes.
`java.lang.String` | `getEncoding()` Returns the mime-encoding used for writing.
`java.lang.String` | `getJavaEncoding()`
`java.lang.String` | `getNewlineString()` Returns the current string used for println newlines
`Path` | `getPath()` Returns the Path which opened this stream.
`java.io.PrintWriter` | `getPrintWriter()` Returns a printWriter writing to this stream.
`StreamImpl` | `getSource()` Returns the underlying source for the stream.
`java.lang.String` | `getUserPath()` Returns the user path which opened this stream.
`void` | `init(StreamImpl source)` Initializes the stream with a given source.
`void` | `log(java.lang.String string)` Logs a line to the stream.
`void` | `log(java.lang.Throwable exn)`
`void` | `print(boolean b)` Prints a boolean.
`void` | `print(char ch)` Prints the character buffer to the stream.
`void` | `print(char[] buffer)` Prints the character buffer to the stream.
`void` | `print(char[] buffer, int offset, int length)` Prints the character buffer to the stream.
`void` | `print(double d)` Prints an double
`void` | `print(float f)` Prints a float.
`void` | `print(int i)` Prints an integer.
`void` | `print(long i)` Prints a long.
`void` | `print(java.lang.Object o)` Prints a double, converted by String.valueOf()
`void` | `print(java.lang.String string)` Prints a string.
`void` | `print(java.lang.String string, int off, int len)` Prints a substring.
`void` | `println()` Prints a newline
`void` | `println(boolean b)` Prints a boolean followed by a newline.
`void` | `println(char ch)` Prints a char followed by a newline.
`void` | `println(char[] buf, int offset, int length)` Prints a character buffer followed by a newline.
`void` | `println(double d)` Prints a double followed by a newline.
`void` | `println(float f)` Prints a float followed by a newline.
`void` | `println(int i)` Prints an integer followed by a newline.
`void` | `println(long l)` Prints a long followed by a newline.
`void` | `println(java.lang.Object o)` Prints an object, converted to a string, followed by a newline.
`void` | `println(java.lang.String string)` Prints a string buffer followed by a newline.
`void` | `pushFilter(StreamFilter filter)` Pushes a filter on the top of the stream stack.
`void` | `removeAttribute(java.lang.String name)` Removes a named attribute.
`void` | `setAttribute(java.lang.String name, java.lang.Object value)` Sets a named attribute.
`void` | `setDisableClose(boolean disableClose)` Disables close.
`void` | `setEncoding(java.lang.String encoding)` Sets the character encoding for writing to this stream.
`void` | `setFlushOnNewline(boolean flushOnNewline)` Some streams, like log streams, should be flushed on every println call.
`void` | `setLocale(java.util.Locale locale)`
`void` | `setNewlineString(java.lang.String newline)` Sets the string to use for println newlines
`void` | `setPath(Path path)` Sets a path name associated with the stream.
`void` | `setWritePrefix(int prefix)`
`void` | `write(byte[] buf)` Writes a byte array.
`void` | `write(byte[] buf, int offset, int length)` Writes a byte array
`void` | `write(int ch)` Writes a byte.
`void` | `writeFile(Path path)` Copies a file to the stream.
`void` | `writeStream(java.io.InputStream source)` Writes the contents of a JDK stream.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### WriteStream

    public WriteStream()

  Creates an uninitialized stream. Use `init` to initialize.

### WriteStream

    public WriteStream(StreamImpl source)

  Creates a stream and initializes with a specified source.
  Parameters:
    `source` - Underlying source for the stream.

Method Detail

### init

    public void init(StreamImpl source)

  Initializes the stream with a given source.
  Parameters:
    `source` - Underlying source for the stream.

### getSource

    public StreamImpl getSource()

  Returns the underlying source for the stream.
  Returns:
    the source

### pushFilter

    public void pushFilter(StreamFilter filter)

  Pushes a filter on the top of the stream stack.
  Parameters:
    `filter` - the filter to be added.

### canWrite

    public boolean canWrite()

  Returns true if the buffer allows writes.

  LogStreams, used for debugging, use this feature to test if they should write with very little overhead. ``

       if (dbg.canWrite())
         dbg.log("some debug value " + expensiveDebugCalculation(foo));

### clearWrite

    public void clearWrite()

  Clears the write buffer

### setWritePrefix

    public void setWritePrefix(int prefix)

### write

    public void write(int ch)
               throws java.io.IOException

  Writes a byte.
  Overrides:
    write in class java.io.OutputStream

### write

    public void write(byte[] buf,
                      int offset,
                      int length)
               throws java.io.IOException

  Writes a byte array
  Overrides:
    write in class java.io.OutputStream

### write

    public void write(byte[] buf)
               throws java.io.IOException

  Writes a byte array.
  Overrides:
    write in class java.io.OutputStream

### flush

    public void flush()
               throws java.io.IOException

  Flushes the buffer to the source.
  Overrides:
    flush in class java.io.OutputStream

### setEncoding

    public void setEncoding(java.lang.String encoding)
                     throws java.io.UnsupportedEncodingException

  Sets the character encoding for writing to this stream. Encoding can be a Java encoding or a mime-encoding.

### setLocale

    public void setLocale(java.util.Locale locale)
                   throws java.io.UnsupportedEncodingException

### getEncoding

    public java.lang.String getEncoding()

  Returns the mime-encoding used for writing.

### getJavaEncoding

    public java.lang.String getJavaEncoding()

### setFlushOnNewline

    public void setFlushOnNewline(boolean flushOnNewline)

  Some streams, like log streams, should be flushed on every println call. Embedded newlines, i.e. '\n' in strings, do not trigger a flush.
  Parameters:
    `flushOnNewline` - set to true if println flushes.

### getNewlineString

    public java.lang.String getNewlineString()

  Returns the current string used for println newlines

### setNewlineString

    public void setNewlineString(java.lang.String newline)

  Sets the string to use for println newlines

### print

    public final void print(char[] buffer,
                            int offset,
                            int length)
                     throws java.io.IOException

  Prints the character buffer to the stream.
  Parameters:
    `buffer` - character buffer to write
    `offset` - offset into the buffer to start writes
    `length` - number of characters to write

### print

    public final void print(char ch)
                     throws java.io.IOException

  Prints the character buffer to the stream.
  Parameters:
    `ch` - char

### print

    public final void print(char[] buffer)
                     throws java.io.IOException

  Prints the character buffer to the stream.
  Parameters:
    `buffer` - character buffer to write

### print

    public final void print(java.lang.String string)
                     throws java.io.IOException

  Prints a string.

### print

    public final void print(java.lang.String string,
                            int off,
                            int len)
                     throws java.io.IOException

  Prints a substring.

### print

    public final void print(boolean b)
                     throws java.io.IOException

  Prints a boolean.

### print

    public final void print(int i)
                     throws java.io.IOException

  Prints an integer.

### print

    public final void print(long i)
                     throws java.io.IOException

  Prints a long.

### print

    public final void print(float f)
                     throws java.io.IOException

  Prints a float.

### print

    public final void print(double d)
                     throws java.io.IOException

  Prints an double

### print

    public final void print(java.lang.Object o)
                     throws java.io.IOException

  Prints a double, converted by String.valueOf()

### println

    public final void println()
                       throws java.io.IOException

  Prints a newline

### println

    public final void println(char[] buf,
                              int offset,
                              int length)
                       throws java.io.IOException

  Prints a character buffer followed by a newline.

### println

    public final void println(java.lang.String string)
                       throws java.io.IOException

  Prints a string buffer followed by a newline.

### println

    public final void println(boolean b)
                       throws java.io.IOException

  Prints a boolean followed by a newline.

### println

    public final void println(char ch)
                       throws java.io.IOException

  Prints a char followed by a newline.

### println

    public final void println(int i)
                       throws java.io.IOException

  Prints an integer followed by a newline.

### println

    public final void println(long l)
                       throws java.io.IOException

  Prints a long followed by a newline.

### println

    public final void println(float f)
                       throws java.io.IOException

  Prints a float followed by a newline.

### println

    public final void println(double d)
                       throws java.io.IOException

  Prints a double followed by a newline.

### println

    public final void println(java.lang.Object o)
                       throws java.io.IOException

  Prints an object, converted to a string, followed by a newline.

### getPrintWriter

    public java.io.PrintWriter getPrintWriter()

  Returns a printWriter writing to this stream.

### log

    public final void log(java.lang.String string)

  Logs a line to the stream. log is essentially println, but it doesn't throw an exception and it always flushes the output.

### log

    public final void log(java.lang.Throwable exn)

### writeStream

    public void writeStream(java.io.InputStream source)
                     throws java.io.IOException

  Writes the contents of a JDK stream. Essentially this will copy `source` to the current stream.
  Parameters:
    `source` - InputStream to read.

### writeFile

    public void writeFile(Path path)
                   throws java.io.IOException

  Copies a file to the stream.
  Parameters:
    `path` - Path of the file to copy.

### setDisableClose

    public void setDisableClose(boolean disableClose)

  Disables close. Sometimes an application will pass a stream to a client that may close the stream at an inappropriate time. Setting disable close gives the calling routine control over closing the stream.

### close

    public final void close()
                     throws java.io.IOException

  Close the stream, first flushing the write buffer.
  Overrides:
    close in class java.io.OutputStream

### getAttribute

    public java.lang.Object getAttribute(java.lang.String name)
                                  throws java.io.IOException

  Returns a named attribute. For example, an HTTP stream may use this to return header values.

### setAttribute

    public void setAttribute(java.lang.String name,
                             java.lang.Object value)
                      throws java.io.IOException

  Sets a named attribute. For example, an HTTP stream may use this to set header values.

### removeAttribute

    public void removeAttribute(java.lang.String name)
                         throws java.io.IOException

  Removes a named attribute.

### getAttributeNames

    public java.util.Iterator getAttributeNames()
                                         throws java.io.IOException

  Lists all named attributes.

### getPath

    public Path getPath()

  Returns the Path which opened this stream.

### getUserPath

    public java.lang.String getUserPath()

  Returns the user path which opened this stream.

  Parsing routines typically use this for error reporting.

### setPath

    public void setPath(Path path)

  Sets a path name associated with the stream.

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