org.apache.openjpa.lib.xml
Class DocTypeReader

java.lang.Object
  java.io.Reader
      org.apache.openjpa.lib.xml.DocTypeReader

All Implemented Interfaces:

Closeable, Readable

public class DocTypeReader
extends Reader

The DocTypeReader can be used to dynamically include a DOCTYPE declaration in an XML stream. Often it is inconvenient to specify a DOCTYPE in XML files -- you many want the option of parsing the files without reading the DTD, the files may move around, making placing a DOCTYPE path to the DTD in them unattractive, and you may have many files, making an in-line include of the DTD unattractive as well. This class makes it possible to maintain XML files without any DOCTYPE declaration, then dynamically include the DOCTYPE information at runtime. If the XML stream already contains a DOCTYPE declaration, the reader will not add an additional one. The DOCTYPE information given to the reader will be placed in the XML stream it wraps just before the root element of the document. Note that all methods other than the various forms of read apply onto the underlying XML stream and should not be used until the header and doc type have been read.

Author:

Abe White

Field Summary

Fields inherited from class java.io.Reader

lock

Constructor Summary

DocTypeReader(Reader xml, Reader docType)
Construct the reader with an XML stream, and set the DOCTYPE information to be included.

Method Summary

void	close()
void	mark(int readAheadLimit)
boolean	markSupported()
int	read()
int	read(char[] buf)
int	read(char[] buf, int off, int len)
boolean	ready()
void	reset()
long	skip(long len)

Methods inherited from class java.io.Reader

read

Methods inherited from class java.lang.Object

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

Constructor Detail

DocTypeReader

public DocTypeReader(Reader xml,
                     Reader docType)
              throws IOException

Construct the reader with an XML stream, and set the DOCTYPE information to be included. The given reader should access an input source containing the exact declaration to include, such as:
<DOCTYPE schedule SYSTEM "schedule.dtd">
<DOCTYPE html PUBLIC "-//W3C//DTD XHTML ...>
<DOCTYPE stock-price [ <ELEMENT symb ... ]>
If the reader is null, no DOCTYPE information will be included in the stream.

Throws:

IOException

Method Detail

read

public int read()
         throws IOException

Overrides:

read in class Reader

Throws:

IOException

read

public int read(char[] buf)
         throws IOException

Overrides:

read in class Reader

Throws:

IOException

read

public int read(char[] buf,
                int off,
                int len)
         throws IOException

Specified by:

read in class Reader

Throws:

IOException

skip

public long skip(long len)
          throws IOException

Overrides:

skip in class Reader

Throws:

IOException

ready

public boolean ready()
              throws IOException

Overrides:

ready in class Reader

Throws:

IOException

markSupported

public boolean markSupported()

Overrides:

markSupported in class Reader

mark

public void mark(int readAheadLimit)
          throws IOException

Overrides:

mark in class Reader

Throws:

IOException

reset

public void reset()
           throws IOException

Overrides:

reset in class Reader

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in class Reader

Throws:

IOException