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package com.sun.org.apache.xerces.internal.impl.io;

import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;



Reader for the ISO-8859-1 encoding.


Author:Michael Glavassevich, IBM
@xerces.internal
Version:$Id: Latin1Reader.java 718095 2008-11-16 20:00:14Z mrglavas $
/**
 * <p>
 * Reader for the ISO-8859-1 encoding.</p>
 *
 * @xerces.internal
 *
 * @author Michael Glavassevich, IBM
 *
 * @version $Id: Latin1Reader.java 718095 2008-11-16 20:00:14Z mrglavas $
 */
public final class Latin1Reader
        extends Reader {

    //
    // Constants
    //
    
Default byte buffer size (2048).

/**
     * Default byte buffer size (2048).
     */
    public static final int DEFAULT_BUFFER_SIZE = 2048;

    //
    // Data
    //
    
Input stream.

/**
     * Input stream.
     */
    protected final InputStream fInputStream;

    
Byte buffer.

/**
     * Byte buffer.
     */
    protected final byte[] fBuffer;

    //
    // Constructors
    //
    
Constructs an ISO-8859-1 reader from the specified input stream using the
default buffer size.

Params:
  • inputStream – The input stream.
/**
     * Constructs an ISO-8859-1 reader from the specified input stream using the
     * default buffer size.
     *
     * @param inputStream The input stream.
     */
    public Latin1Reader(InputStream inputStream) {
        this(inputStream, DEFAULT_BUFFER_SIZE);
    } // <init>(InputStream)

    
Constructs an ISO-8859-1 reader from the specified input stream and
buffer size.

Params:
  • inputStream – The input stream.
  • size – The initial buffer size.
/**
     * Constructs an ISO-8859-1 reader from the specified input stream and
     * buffer size.
     *
     * @param inputStream The input stream.
     * @param size The initial buffer size.
     */
    public Latin1Reader(InputStream inputStream, int size) {
        this(inputStream, new byte[size]);
    } // <init>(InputStream, int)

    
Constructs an ISO-8859-1 reader from the specified input stream and
buffer.

Params:
  • inputStream – The input stream.
  • buffer – The byte buffer.
/**
     * Constructs an ISO-8859-1 reader from the specified input stream and
     * buffer.
     *
     * @param inputStream The input stream.
     * @param buffer The byte buffer.
     */
    public Latin1Reader(InputStream inputStream, byte[] buffer) {
        fInputStream = inputStream;
        fBuffer = buffer;
    } // <init>(InputStream, byte[])

    //
    // Reader methods
    //
    
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.

Throws:
Returns:The character read, as an integer in the range 0 to 255
(0x00-0xff), or -1 if the end of the stream has been reached
/**
     * 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.
     *
     * <p>
     * Subclasses that intend to support efficient single-character input should
     * override this method.
     *
     * @return The character read, as an integer in the range 0 to 255
     * (<tt>0x00-0xff</tt>), or -1 if the end of the stream has been reached
     *
     * @exception IOException If an I/O error occurs
     */
    public int read() throws IOException {
        return fInputStream.read();
    } // read():int

    
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.

Params:
  • ch – Destination buffer
  • offset – Offset at which to start storing characters
  • length – Maximum number of characters to read
Throws:
Returns:The number of characters read, or -1 if the end of the stream has
been reached
/**
     * 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.
     *
     * @param ch Destination buffer
     * @param offset Offset at which to start storing characters
     * @param length Maximum number of characters to read
     *
     * @return The number of characters read, or -1 if the end of the stream has
     * been reached
     *
     * @exception IOException If an I/O error occurs
     */
    public int read(char ch[], int offset, int length) throws IOException {
        if (length > fBuffer.length) {
            length = fBuffer.length;
        }
        int count = fInputStream.read(fBuffer, 0, length);
        for (int i = 0; i < count; ++i) {
            ch[offset + i] = (char) (fBuffer[i] & 0xff);
        }
        return count;
    } // read(char[],int,int)

    
Skip characters. This method will block until some characters are
available, an I/O error occurs, or the end of the stream is reached.

Params:
  • n – The number of characters to skip
Throws:
Returns:The number of characters actually skipped
/**
     * Skip characters. This method will block until some characters are
     * available, an I/O error occurs, or the end of the stream is reached.
     *
     * @param n The number of characters to skip
     *
     * @return The number of characters actually skipped
     *
     * @exception IOException If an I/O error occurs
     */
    public long skip(long n) throws IOException {
        return fInputStream.skip(n);
    } // skip(long):long

    
Tell whether this stream is ready to be read.

Throws:
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.
/**
     * Tell whether this stream is ready to be read.
     *
     * @return 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.
     *
     * @exception IOException If an I/O error occurs
     */
    public boolean ready() throws IOException {
        return false;
    } // ready()

    
Tell whether this stream supports the mark() operation.

/**
     * Tell whether this stream supports the mark() operation.
     */
    public boolean markSupported() {
        return fInputStream.markSupported();
    } // markSupported()

    
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.

Params:
  • 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:
  • IOException – If the stream does not support mark(), or if some
other I/O error occurs
/**
     * 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.
     *
     * @param 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.
     *
     * @exception IOException If the stream does not support mark(), or if some
     * other I/O error occurs
     */
    public void mark(int readAheadLimit) throws IOException {
        fInputStream.mark(readAheadLimit);
    } // mark(int)

    
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().

Throws:
  • 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
/**
     * 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().
     *
     * @exception 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
     */
    public void reset() throws IOException {
        fInputStream.reset();
    } // reset()

    
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.

Throws:
  • IOException – If an I/O error occurs
/**
     * 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.
     *
     * @exception IOException If an I/O error occurs
     */
    public void close() throws IOException {
        fInputStream.close();
    } // close()

} // class Latin1Reader