Package org.apache.jasper.xmlparser

Class UTF8Reader

  • All Implemented Interfaces:
    java.io.Closeable, java.lang.AutoCloseable, java.lang.Readable
    public class UTF8Reader
extends java.io.Reader
    Version:
    $Id: UTF8Reader.java,v 1.4 2006/10/03 02:25:27 jluehe Exp $

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static int DEFAULT_BUFFER_SIZE
      Default byte buffer size (2048).
      protected byte[] fBuffer
      Byte buffer.
      protected java.io.InputStream fInputStream
      Input stream.
      protected int fOffset
      Offset into buffer.
      private int fSurrogate
      Surrogate character.

      • Fields inherited from class java.io.Reader

        lock

    • Constructor Summary

      Constructors 
      Constructor Description
      UTF8Reader​(java.io.InputStream inputStream, int size)
      Constructs a UTF-8 reader from the specified input stream, buffer size and MessageFormatter.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void close()
      Close the stream.
      private void expectedByte​(int position, int count)
      Throws an exception for expected byte.
      private void invalidByte​(int position, int count, int c)
      Throws an exception for invalid byte.
      private void invalidSurrogate​(int uuuuu)
      Throws an exception for invalid surrogate bits.
      void mark​(int readAheadLimit)
      Mark the present position in the stream.
      boolean markSupported()
      Tell whether this stream supports the mark() operation.
      int read()
      Read a single character.
      int read​(char[] ch, int offset, int length)
      Read characters into a portion of an array.
      boolean ready()
      Tell whether this stream is ready to be read.
      void reset()
      Reset the stream.
      long skip​(long n)
      Skip characters.

      • Methods inherited from class java.io.Reader

        nullReader, read, read, transferTo

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • DEFAULT_BUFFER_SIZE

        public static final int DEFAULT_BUFFER_SIZE
        Default byte buffer size (2048).
        See Also:
        Constant Field Values

      • fInputStream

        protected java.io.InputStream fInputStream
        Input stream.

      • fBuffer

        protected byte[] fBuffer
        Byte buffer.

      • fOffset

        protected int fOffset
        Offset into buffer.

      • fSurrogate

        private int fSurrogate
        Surrogate character.

    • Constructor Detail

      • UTF8Reader

        public UTF8Reader​(java.io.InputStream inputStream,
                  int size)
        Constructs a UTF-8 reader from the specified input stream, buffer size and MessageFormatter.
        Parameters:
        inputStream - The input stream.
        size - The initial buffer size.

    • Method Detail

      • read

        public int read()
         throws java.io.IOException
        Read a single character. This method will block until a character is available, an I/O error occurs, or the end of the stream is reached.

        Subclasses that intend to support efficient single-character input should override this method.

        Overrides:
        read in class java.io.Reader
        Returns:
        The character read, as an integer in the range 0 to 16383 (0x00-0xffff), or -1 if the end of the stream has been reached
        Throws:
        java.io.IOException - If an I/O error occurs

      • read

        public int read​(char[] ch,
                int offset,
                int length)
         throws java.io.IOException
        Read characters into a portion of an array. This method will block until some input is available, an I/O error occurs, or the end of the stream is reached.
        Specified by:
        read in class java.io.Reader
        Parameters:
        ch - Destination buffer
        offset - Offset at which to start storing characters
        length - Maximum number of characters to read
        Returns:
        The number of characters read, or -1 if the end of the stream has been reached
        Throws:
        java.io.IOException - If an I/O error occurs

      • skip

        public long skip​(long n)
          throws java.io.IOException
        Skip characters. This method will block until some characters are available, an I/O error occurs, or the end of the stream is reached.
        Overrides:
        skip in class java.io.Reader
        Parameters:
        n - The number of characters to skip
        Returns:
        The number of characters actually skipped
        Throws:
        java.io.IOException - If an I/O error occurs

      • ready

        public boolean ready()
              throws java.io.IOException
        Tell whether this stream is ready to be read.
        Overrides:
        ready in class java.io.Reader
        Returns:
        True if the next read() is guaranteed not to block for input, false otherwise. Note that returning false does not guarantee that the next read will block.
        Throws:
        java.io.IOException - If an I/O error occurs

      • markSupported

        public boolean markSupported()
        Tell whether this stream supports the mark() operation.
        Overrides:
        markSupported in class java.io.Reader

      • mark

        public void mark​(int readAheadLimit)
          throws java.io.IOException
        Mark the present position in the stream. Subsequent calls to reset() will attempt to reposition the stream to this point. Not all character-input streams support the mark() operation.
        Overrides:
        mark in class java.io.Reader
        Parameters:
        readAheadLimit - Limit on the number of characters that may be read while still preserving the mark. After reading this many characters, attempting to reset the stream may fail.
        Throws:
        java.io.IOException - If the stream does not support mark(), or if some other I/O error occurs

      • reset

        public void reset()
           throws java.io.IOException
        Reset the stream. If the stream has been marked, then attempt to reposition it at the mark. If the stream has not been marked, then attempt to reset it in some way appropriate to the particular stream, for example by repositioning it to its starting point. Not all character-input streams support the reset() operation, and some support reset() without supporting mark().
        Overrides:
        reset in class java.io.Reader
        Throws:
        java.io.IOException - If the stream has not been marked, or if the mark has been invalidated, or if the stream does not support reset(), or if some other I/O error occurs

      • close

        public void close()
           throws java.io.IOException
        Close the stream. Once a stream has been closed, further read(), ready(), mark(), or reset() invocations will throw an IOException. Closing a previously-closed stream, however, has no effect.
        Specified by:
        close in interface java.lang.AutoCloseable
        Specified by:
        close in interface java.io.Closeable
        Specified by:
        close in class java.io.Reader
        Throws:
        java.io.IOException - If an I/O error occurs

      • expectedByte

        private void expectedByte​(int position,
                          int count)
                   throws java.io.UTFDataFormatException
        Throws an exception for expected byte.
        Throws:
        java.io.UTFDataFormatException

      • invalidByte

        private void invalidByte​(int position,
                         int count,
                         int c)
                  throws java.io.UTFDataFormatException
        Throws an exception for invalid byte.
        Throws:
        java.io.UTFDataFormatException

      • invalidSurrogate

        private void invalidSurrogate​(int uuuuu)
                       throws java.io.UTFDataFormatException
        Throws an exception for invalid surrogate bits.
        Throws:
        java.io.UTFDataFormatException