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org.apache.xerces.readers
Class XMLDeclRecognizer  

java.lang.Object
  org.apache.xerces.readers.XMLDeclRecognizer

Direct Known Subclasses:

EBCDICRecognizer, UCSRecognizer, UTF8Recognizer

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public abstract class XMLDeclRecognizer

extends java.lang.Object

Abstract base class for encoding recognizers. When we encounter an external entity, including the document entity, and do not know what the encoding of the underlying byte stream is, we need to look at the contents of the stream to find out. We do this by asking a set of "recognizers" to look at the stream data and if the recognizer can understand the encoding it will try to read an XML or text declaration, if present, and construct the appropriate reader for that encoding. The recognizer subclasses will typically use the prescanXMLDeclOrTextDecl() method if the stream looks like it does begin with such a declaration using a temporary reader that can support the calls needed to scan through the encoding declaration.

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Field Summary
private static char[]	encoding_string
private static char[]	version_string
private static char[]	xml_string

 

Constructor Summary

XMLDeclRecognizer()

 

Method Summary
protected  int	prescanXMLDeclOrTextDecl(XMLEntityHandler.EntityReader entityReader, boolean xmlDecl)           Support for getting the value of an EncodingDecl using an XMLReader.
abstract  XMLEntityHandler.EntityReader	recognize(XMLEntityReaderFactory readerFactory, XMLEntityHandler entityHandler, org.apache.xerces.framework.XMLErrorReporter errorReporter, boolean sendCharDataAsCharArray, org.apache.xerces.utils.StringPool stringPool, org.apache.xerces.utils.ChunkyByteArray data, boolean xmlDecl, boolean allowJavaEncodingName)           Subclasses override this method to support recognizing their encodings.
static void	registerDefaultRecognizers(java.util.Stack recognizerStack)           Register the standard recognizers.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

xml_string

private static final char[] xml_string

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version_string

private static final char[] version_string

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encoding_string

private static final char[] encoding_string

Constructor Detail

XMLDeclRecognizer

public XMLDeclRecognizer()

Method Detail

registerDefaultRecognizers

public static void registerDefaultRecognizers(java.util.Stack recognizerStack)

Register the standard recognizers.

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recognize

public abstract XMLEntityHandler.EntityReader recognize(XMLEntityReaderFactory readerFactory,
                                                        XMLEntityHandler entityHandler,
                                                        org.apache.xerces.framework.XMLErrorReporter errorReporter,
                                                        boolean sendCharDataAsCharArray,
                                                        org.apache.xerces.utils.StringPool stringPool,
                                                        org.apache.xerces.utils.ChunkyByteArray data,
                                                        boolean xmlDecl,
                                                        boolean allowJavaEncodingName)
                                                 throws java.lang.Exception

Subclasses override this method to support recognizing their encodings.

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prescanXMLDeclOrTextDecl

protected int prescanXMLDeclOrTextDecl(XMLEntityHandler.EntityReader entityReader,
                                       boolean xmlDecl)
                                throws java.lang.Exception

Support for getting the value of an EncodingDecl using an XMLReader. This is the minimal logic from the scanner to recognize an XMLDecl or TextDecl using the XMLReader interface.

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