net.n3.nanoxml
Class StdXMLReader

java.lang.Object
  net.n3.nanoxml.StdXMLReader

All Implemented Interfaces:

IXMLReader

public class StdXMLReader
extends Object
implements IXMLReader

StdXMLReader reads the data to be parsed.

Author:

Marc De Scheemaecker

Constructor Summary

StdXMLReader(InputStream stream)
Initializes the XML reader.

StdXMLReader(Reader reader)
Initializes the XML reader.

StdXMLReader(String publicID, String systemID)
Initializes the reader from a system and public ID.

Method Summary

boolean	atEOF() Returns true if there are no more characters left to be read.
boolean	atEOFOfCurrentStream() Returns true if the current stream has no more characters left to be read.
static IXMLReader	fileReader(String filename) Creates a new reader using a file as input.
protected void	finalize() Cleans up the object when it's destroyed.
protected String	getEncoding(String str) Scans the encoding from an <?xml...?> tag.
int	getLineNr() Returns the line number of the data in the current stream.
String	getPublicID() Returns the current public ID.
int	getStreamLevel() Returns the current "level" of the stream on the stack of streams.
String	getSystemID() Returns the current system ID.
Reader	openStream(String publicID, String systemID) Opens a stream from a public and system ID.
char	read() Reads a character.
void	setPublicID(String publicID) Sets the public ID of the current stream.
void	setSystemID(String systemID) Sets the system ID of the current stream.
void	startNewStream(Reader reader) Starts a new stream from a Java reader.
void	startNewStream(Reader reader, boolean isInternalEntity) Starts a new stream from a Java reader.
protected Reader	stream2reader(InputStream stream, StringBuffer charsRead) Converts a stream to a reader while detecting the encoding.
static IXMLReader	stringReader(String str) Creates a new reader using a string as input.
void	unread(char ch) Pushes the last character read back to the stream.

Methods inherited from class java.lang.Object

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

Constructor Detail

StdXMLReader

public StdXMLReader(String publicID,
                    String systemID)
             throws MalformedURLException,
                    FileNotFoundException,
                    IOException

Initializes the reader from a system and public ID.

Parameters:

publicID - the public ID which may be null.

systemID - the non-null system ID.

Throws:

MalformedURLException - if the system ID does not contain a valid URL

FileNotFoundException - if the system ID refers to a local file which does not exist

IOException - if an error occurred opening the stream

StdXMLReader

public StdXMLReader(Reader reader)

Initializes the XML reader.

Parameters:

reader - the input for the XML data.

StdXMLReader

public StdXMLReader(InputStream stream)
             throws IOException

Initializes the XML reader.

Parameters:

stream - the input for the XML data.

Throws:

IOException - if an I/O error occurred

Method Detail

stringReader

public static IXMLReader stringReader(String str)

Creates a new reader using a string as input.

Parameters:

str - the string containing the XML data

fileReader

public static IXMLReader fileReader(String filename)
                             throws FileNotFoundException,
                                    IOException

Creates a new reader using a file as input.

Parameters:

filename - the name of the file containing the XML data

Throws:

FileNotFoundException - if the file could not be found

IOException - if an I/O error occurred

finalize

protected void finalize()
                 throws Throwable

Cleans up the object when it's destroyed.

Overrides:

finalize in class Object

Throws:

Throwable

getEncoding

protected String getEncoding(String str)

Scans the encoding from an <?xml...?> tag.

Parameters:

str - the first tag in the XML data.

Returns:

the encoding, or null if no encoding has been specified.

stream2reader

protected Reader stream2reader(InputStream stream,
                               StringBuffer charsRead)
                        throws IOException

Converts a stream to a reader while detecting the encoding.

Parameters:

stream - the input for the XML data.

charsRead - buffer where to put characters that have been read

Throws:

IOException - if an I/O error occurred

read

public char read()
          throws IOException

Reads a character.

Specified by:

read in interface IXMLReader

Returns:

the character

Throws:

IOException - if no character could be read

atEOFOfCurrentStream

public boolean atEOFOfCurrentStream()
                             throws IOException

Returns true if the current stream has no more characters left to be read.

Specified by:

atEOFOfCurrentStream in interface IXMLReader

Throws:

IOException - if an I/O error occurred

atEOF

public boolean atEOF()
              throws IOException

Returns true if there are no more characters left to be read.

Specified by:

atEOF in interface IXMLReader

Throws:

IOException - if an I/O error occurred

unread

public void unread(char ch)
            throws IOException

Pushes the last character read back to the stream.

Specified by:

unread in interface IXMLReader

Parameters:

ch - the character to push back.

Throws:

IOException - if an I/O error occurred

openStream

public Reader openStream(String publicID,
                         String systemID)
                  throws MalformedURLException,
                         FileNotFoundException,
                         IOException

Opens a stream from a public and system ID.

Specified by:

openStream in interface IXMLReader

Parameters:

publicID - the public ID, which may be null

systemID - the system ID, which is never null

Throws:

MalformedURLException - if the system ID does not contain a valid URL

FileNotFoundException - if the system ID refers to a local file which does not exist

IOException - if an error occurred opening the stream

startNewStream

public void startNewStream(Reader reader)

Starts a new stream from a Java reader. The new stream is used temporary to read data from. If that stream is exhausted, control returns to the parent stream.

Specified by:

startNewStream in interface IXMLReader

Parameters:

reader - the non-null reader to read the new data from

startNewStream

public void startNewStream(Reader reader,
                           boolean isInternalEntity)

Starts a new stream from a Java reader. The new stream is used temporary to read data from. If that stream is exhausted, control returns to the parent stream.

Specified by:

startNewStream in interface IXMLReader

Parameters:

reader - the non-null reader to read the new data from

isInternalEntity - true if the reader is produced by resolving an internal entity

getStreamLevel

public int getStreamLevel()

Returns the current "level" of the stream on the stack of streams.

Specified by:

getStreamLevel in interface IXMLReader

getLineNr

public int getLineNr()

Returns the line number of the data in the current stream.

Specified by:

getLineNr in interface IXMLReader

setSystemID

public void setSystemID(String systemID)
                 throws MalformedURLException

Sets the system ID of the current stream.

Specified by:

setSystemID in interface IXMLReader

Parameters:

systemID - the system ID

Throws:

MalformedURLException - if the system ID does not contain a valid URL

setPublicID

public void setPublicID(String publicID)

Sets the public ID of the current stream.

Specified by:

setPublicID in interface IXMLReader

Parameters:

publicID - the public ID

getSystemID

public String getSystemID()

Returns the current system ID.

Specified by:

getSystemID in interface IXMLReader

getPublicID

public String getPublicID()

Returns the current public ID.

Specified by:

getPublicID in interface IXMLReader