Xerces2 Implementation: Class XIncludeTextReader

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## org.apache.xerces.xinclude
Class XIncludeTextReader

    java.lang.Object
      |
      +--org.apache.xerces.xinclude.XIncludeTextReader

Direct Known Subclasses:
  XInclude11TextReader

public class XIncludeTextReader
extends java.lang.Object

This class is used for reading resources requested in <include> elements, when the parse attribute of the <include> element is "text". Using this class will open the location, detect the encoding, and discard the byte order mark, if applicable. REVISIT: Much of the code in this class is taken from XMLEntityManager. It would be nice if this code could be shared in some way. However, since XMLEntityManager is used for reading files as XML, and this needs to read files as text, there would need to be some refactoring done.

Version:
  $Id: XIncludeTextReader.java 572046 2007-09-02 17:33:57Z mrglavas $
Author:
  Michael Glavassevich, IBM, Peter McCracken, IBM, Ankit Pasricha, IBM, Arun Yadav, Sun Microsystems Inc.
See Also:
  `XIncludeHandler`

Constructor Summary
`XIncludeTextReader(org.apache.xerces.xni.parser.XMLInputSource source, XIncludeHandler handler, int bufferSize)` Construct the XIncludeReader using the XMLInputSource and XIncludeHandler.

Method Summary
`void` | `close()` Closes the stream.
`protected java.lang.String` | `consumeBOM(java.io.InputStream stream, java.lang.String encoding)` Removes the byte order mark from the stream, if it exists and returns the encoding name.
`protected java.lang.String` | `getEncodingName(byte[] b4)` REVISIT: This code is taken from org.apache.xerces.impl.XMLEntityManager.
`protected java.lang.String` | `getEncodingName(java.io.InputStream stream)` XMLEntityManager cares about endian-ness, since it creates its own optimized readers.
`protected java.io.Reader` | `getReader(org.apache.xerces.xni.parser.XMLInputSource source)` Return the Reader for given XMLInputSource.
`protected boolean` | `isValid(int ch)` Returns true if the specified character is a valid XML character as per the rules of XML 1.0.
`void` | `parse()` Read the input stream as text, and pass the text on to the XIncludeHandler using calls to characters().
`protected void` | `setBufferSize(int bufferSize)` Sets the buffer size property for the reader which decides the chunk sizes that are parsed by the reader at a time and passed to the handler
`void` | `setErrorReporter(XMLErrorReporter errorReporter)` Sets the XMLErrorReporter used for reporting errors while reading the text include.
`void` | `setInputSource(org.apache.xerces.xni.parser.XMLInputSource source)` Sets the input source on this text reader.

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

Constructor Detail

### XIncludeTextReader

    public XIncludeTextReader(org.apache.xerces.xni.parser.XMLInputSource source,
                              XIncludeHandler handler,
                              int bufferSize)
                       throws java.io.IOException

  Construct the XIncludeReader using the XMLInputSource and XIncludeHandler.
  Parameters:
    `source` - The XMLInputSource to use.
    `handler` - The XIncludeHandler to use.
    `bufferSize` - The size of this text reader's buffer.

Method Detail

### setErrorReporter

    public void setErrorReporter(XMLErrorReporter errorReporter)

  Sets the XMLErrorReporter used for reporting errors while reading the text include.
  Parameters:
    `errorReporter` - the XMLErrorReporter to be used for reporting errors.

### getReader

    protected java.io.Reader getReader(org.apache.xerces.xni.parser.XMLInputSource source)
                                throws java.io.IOException

  Return the Reader for given XMLInputSource.
  Parameters:
    `source` - The XMLInputSource to use.

### getEncodingName

    protected java.lang.String getEncodingName(java.io.InputStream stream)
                                        throws java.io.IOException

  XMLEntityManager cares about endian-ness, since it creates its own optimized readers. Since we're just using generic Java readers for now, we're not caring about endian-ness. If this changes, even more code needs to be copied from XMLEntity manager. -- PJM

### consumeBOM

    protected java.lang.String consumeBOM(java.io.InputStream stream,
                                          java.lang.String encoding)
                                   throws java.io.IOException

  Removes the byte order mark from the stream, if it exists and returns the encoding name.
  Parameters:
    `stream` -
    `encoding` -
  Throws:
    `java.io.IOException` -

### getEncodingName

    protected java.lang.String getEncodingName(byte[] b4)

  REVISIT: This code is taken from org.apache.xerces.impl.XMLEntityManager. Is there any way we can share the code, without having it implemented twice? I think we should make it public and static in XMLEntityManager. --PJM Returns the IANA encoding name that is auto-detected from the bytes specified, with the endian-ness of that encoding where appropriate.
  Parameters:
    `b4` - The first four bytes of the input.
  Returns:
    the encoding name, or null if no encoding could be detected

### parse

    public void parse()
               throws java.io.IOException

  Read the input stream as text, and pass the text on to the XIncludeHandler using calls to characters(). This will read all of the text it can from the resource.
  Throws:
    `java.io.IOException` -

### setInputSource

    public void setInputSource(org.apache.xerces.xni.parser.XMLInputSource source)

  Sets the input source on this text reader.
  Parameters:
    `source` - The XMLInputSource to use.

### close

    public void close()
               throws java.io.IOException

  Closes the stream. Call this after parse(), or when there is no longer any need for this object.
  Throws:
    `java.io.IOException` -

### isValid

    protected boolean isValid(int ch)

  Returns true if the specified character is a valid XML character as per the rules of XML 1.0.
  Parameters:
    `ch` - The character to check.

### setBufferSize

    protected void setBufferSize(int bufferSize)

  Sets the buffer size property for the reader which decides the chunk sizes that are parsed by the reader at a time and passed to the handler
  Parameters:
    `bufferSize` - The size of the buffer desired

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