org.geotools.xml.transform

Class TransformerBase.TranslatorSupport

Object

TransformerBase.TranslatorSupport

All Implemented Interfaces:

Translator

Direct Known Subclasses:

FeatureTransformer.FeatureTranslator, FeatureTypeTransformer.FeatureTypeTranslator, FilterTransformer.FilterTranslator, GeometryTransformer.GeometryTranslator

Enclosing class:

TransformerBase

protected abstract static class TransformerBase.TranslatorSupport
extends Object
implements Translator

Support for writing Translators.

Field Summary

Fields

Modifier and Type	Field and Description
protected ContentHandler	contentHandler
protected NamespaceSupport	nsSupport
protected Attributes	NULL_ATTS
protected boolean	running Subclasses should check this flag in case an abort message was sent and stop any internal iteration if false.
protected TransformerBase.SchemaLocationSupport	schemaLocation

Constructor Summary

Constructors

Constructor and Description
TranslatorSupport(ContentHandler contentHandler, String prefix, String nsURI)
TranslatorSupport(ContentHandler contentHandler, String prefix, String nsURI, TransformerBase.SchemaLocationSupport schemaLocation)

Method Summary

Modifier and Type	Method and Description
void	abort() Abort any translating activity.
protected void	addNamespaceDeclarations(TransformerBase.TranslatorSupport trans) Utility method to copy namespace declarations from "sub" translators into this ns support...
protected void	cdata(String cdata)
protected void	chars(String text)
protected void	comment(String comment)
protected void	commit() Commit pending write operations.
protected AttributesImpl	createAttributes(String[] nameValuePairs) Utility method for creating attributes from an array of name value pairs.
protected void	element(String element, String content)
protected void	element(String element, String content, Attributes atts)
protected void	elementSafe(String element, String content) Will only issue the provided element if content is non empty
protected void	end(String element)
String	getDefaultNamespace() Get the default URI used by this Translator for encoding.
String	getDefaultPrefix() Get the default prefix used by this Translator for encoding.
NamespaceSupport	getNamespaceSupport() Obtain the namespace prefixes and URIs to be included in the output document.
TransformerBase.SchemaLocationSupport	getSchemaLocationSupport() Gets the location of the schemas used in this translator.
protected void	mark() Set a mark() to which we can later "roll back" writes.
protected void	reset() Discard pending write operations after a mark() has been set.
protected void	start(String element)
protected void	start(String element, Attributes atts)

Methods inherited from class Object

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

Methods inherited from interface Translator

encode

Field Detail

contentHandler

protected final ContentHandler contentHandler

NULL_ATTS

protected final Attributes NULL_ATTS

nsSupport

protected NamespaceSupport nsSupport

schemaLocation

protected TransformerBase.SchemaLocationSupport schemaLocation

running

protected volatile boolean running

Subclasses should check this flag in case an abort message was sent and stop any internal iteration if false.

Constructor Detail

TranslatorSupport

public TranslatorSupport(ContentHandler contentHandler,
                         String prefix,
                         String nsURI)

TranslatorSupport

public TranslatorSupport(ContentHandler contentHandler,
                         String prefix,
                         String nsURI,
                         TransformerBase.SchemaLocationSupport schemaLocation)

Method Detail

abort

public void abort()

Description copied from interface: Translator

Abort any translating activity. This is needed as some translators iterate internally on a data structure. The abort method should silently fail or succeed based upon the state of a translation.

Specified by:

abort in interface Translator

mark

protected void mark()

Set a mark() to which we can later "roll back" writes. After a call to mark(), the Translator stores pending write operations in memory until commit() is called. The pending writes can be discarded with the reset() method.

Typically, one would use marks in conjunction with an exception handler:

   void encodeFoo(Foo f) {
     try {
       mark();
       element(foo.riskyMethod());
       element(foo.dangerousMethod());
       commit();
     } catch (BadThingHappened disaster) {
         mitigate(disaster);
         reset();
     }
   }
 

Throws:

IllegalStateException - if a mark is already set

reset

protected void reset()

Discard pending write operations after a mark() has been set.

This method is safe to call even if no mark is set - so it returns to a "known good" state as far as marks are concerned.

See Also:

mark()

commit

protected void commit()

Commit pending write operations. After setting a mark, this method will commit the pending writes.

Throws:

IllegalStateException - if no mark is set

See Also:

mark()

addNamespaceDeclarations

protected void addNamespaceDeclarations(TransformerBase.TranslatorSupport trans)

Utility method to copy namespace declarations from "sub" translators into this ns support...

createAttributes

protected AttributesImpl createAttributes(String[] nameValuePairs)

Utility method for creating attributes from an array of name value pairs.

The nameValuePairs array should be of the form:

{name1,value1,name2,value2,...,nameN,valueN}

Parameters:

nameValuePairs - The attribute names/values.

element

protected void element(String element,
                       String content)

elementSafe

protected void elementSafe(String element,
                           String content)

Will only issue the provided element if content is non empty

Parameters:

element -

content -

element

protected void element(String element,
                       String content,
                       Attributes atts)

start

protected void start(String element)

start

protected void start(String element,
                     Attributes atts)

chars

protected void chars(String text)

end

protected void end(String element)

cdata

protected void cdata(String cdata)

comment

protected void comment(String comment)

getDefaultNamespace

public String getDefaultNamespace()

Description copied from interface: Translator

Get the default URI used by this Translator for encoding. Optional.

Specified by:

getDefaultNamespace in interface Translator

getDefaultPrefix

public String getDefaultPrefix()

Description copied from interface: Translator

Get the default prefix used by this Translator for encoding. Optional.

Specified by:

getDefaultPrefix in interface Translator

getNamespaceSupport

public NamespaceSupport getNamespaceSupport()

Description copied from interface: Translator

Obtain the namespace prefixes and URIs to be included in the output document.

Specified by:

getNamespaceSupport in interface Translator

Returns:

An instance of NamespaceSupport.

getSchemaLocationSupport

public TransformerBase.SchemaLocationSupport getSchemaLocationSupport()

Description copied from interface: Translator

Gets the location of the schemas used in this translator. Optional.

Specified by:

getSchemaLocationSupport in interface Translator