gnu.xml.dom.ls

Class DomLSSerializer

Implemented Interfaces:
DOMConfiguration, DOMStringList, LSSerializer

public class DomLSSerializer
extends StreamSerializer
implements LSSerializer, DOMConfiguration, DOMStringList

Serialize a DOM node to a stream.

Field Summary

Fields inherited from class gnu.xml.transform.StreamSerializer

discardDefaultContent, encoding, eol, xmlDeclaration

Constructor Summary

DomLSSerializer()

Method Summary

boolean
canSetParameter(String name, Object value)
Check if setting a parameter to a specific value is supported.
boolean
contains(String str)
Test if a string is part of this DOMStringList.
DOMConfiguration
getDomConfig()
The DOMConfiguration object used by the LSSerializer when serializing a DOM node.
LSSerializerFilter
getFilter()
When the application provides a filter, the serializer will call out to the filter before serializing each Node.
int
getLength()
The number of DOMStrings in the list.
String
getNewLine()
The end-of-line sequence of characters to be used in the XML being written out.
Object
getParameter(String name)
Return the value of a parameter if known.
DOMStringList
getParameterNames()
The list of the parameters supported by this DOMConfiguration object and for which at least one value can be set by the application.
String
item(int i)
Returns the indexth item in the collection.
void
serialize(Node node, OutputStream out)
void
setFilter(LSSerializerFilter filter)
When the application provides a filter, the serializer will call out to the filter before serializing each Node.
void
setNewLine(String newLine)
The end-of-line sequence of characters to be used in the XML being written out.
void
setParameter(String name, Object value)
Set the value of a parameter.
boolean
write(Node node, LSOutput output)
Serialize the specified node as described above in the general description of the LSSerializer interface.
String
writeToString(Node node)
Serialize the specified node as described above in the general description of the LSSerializer interface.
boolean
writeToURI(Node node, String uri)
A convenience method that acts as if LSSerializer.write was called with a LSOutput with no encoding specified and LSOutput.systemId set to the uri argument.

Methods inherited from class gnu.xml.transform.StreamSerializer

serialize

Constructor Details

DomLSSerializer

public DomLSSerializer()

Method Details

canSetParameter

public boolean canSetParameter(String name,
                               Object value)
Check if setting a parameter to a specific value is supported.
Specified by:
canSetParameter in interface DOMConfiguration

Parameters:
name - The name of the parameter to check.
value - An object. if null, the returned value is true.

Returns:
true if the parameter could be successfully set to the specified value, or false if the parameter is not recognized or the requested value is not supported. This does not change the current value of the parameter itself.


contains

public boolean contains(String str)
Test if a string is part of this DOMStringList.
Specified by:
contains in interface DOMStringList

Parameters:
str - The string to look for.

Returns:
true if the string has been found, false otherwise.


getDomConfig

public DOMConfiguration getDomConfig()
The DOMConfiguration object used by the LSSerializer when serializing a DOM node.
In addition to the parameters recognized by the DOMConfiguration interface defined in [DOM Level 3 Core] , the DOMConfiguration objects for LSSerializer adds, or modifies, the following parameters:
"canonical-form"
true
[optional] Writes the document according to the rules specified in [Canonical XML]. In addition to the behavior described in " canonical-form" [DOM Level 3 Core] , setting this parameter to true will set the parameters "format-pretty-print", "discard-default-content", and "xml-declaration ", to false. Setting one of those parameters to true will set this parameter to false. Serializing an XML 1.1 document when "canonical-form" is true will generate a fatal error.
false
[required] (default) Do not canonicalize the output.
"discard-default-content"
true
[required] (default) Use the Attr.specified attribute to decide what attributes should be discarded. Note that some implementations might use whatever information available to the implementation (i.e. XML schema, DTD, the Attr.specified attribute, and so on) to determine what attributes and content to discard if this parameter is set to true.
false
[required]Keep all attributes and all content.
"format-pretty-print"
true
[optional] Formatting the output by adding whitespace to produce a pretty-printed, indented, human-readable form. The exact form of the transformations is not specified by this specification. Pretty-printing changes the content of the document and may affect the validity of the document, validating implementations should preserve validity.
false
[required] (default) Don't pretty-print the result.
"ignore-unknown-character-denormalizations"
true
[required] (default) If, while verifying full normalization when [XML 1.1] is supported, a character is encountered for which the normalization properties cannot be determined, then raise a "unknown-character-denormalization" warning (instead of raising an error, if this parameter is not set) and ignore any possible denormalizations caused by these characters.
false
[optional] Report a fatal error if a character is encountered for which the processor cannot determine the normalization properties.
"normalize-characters"
This parameter is equivalent to the one defined by DOMConfiguration in [DOM Level 3 Core] . Unlike in the Core, the default value for this parameter is true. While DOM implementations are not required to support fully normalizing the characters in the document according to appendix E of [XML 1.1], this parameter must be activated by default if supported.
"xml-declaration"
true
[required] (default) If a Document, Element, or Entity node is serialized, the XML declaration, or text declaration, should be included. The version (Document.xmlVersion if the document is a Level 3 document and the version is non-null, otherwise use the value "1.0"), and the output encoding (see LSSerializer.write for details on how to find the output encoding) are specified in the serialized XML declaration.
false
[required] Do not serialize the XML and text declarations. Report a "xml-declaration-needed" warning if this will cause problems (i.e. the serialized data is of an XML version other than [XML 1.0], or an encoding would be needed to be able to re-parse the serialized data).
Specified by:
getDomConfig in interface LSSerializer


getFilter

public LSSerializerFilter getFilter()
When the application provides a filter, the serializer will call out to the filter before serializing each Node. The filter implementation can choose to remove the node from the stream or to terminate the serialization early.
The filter is invoked after the operations requested by the DOMConfiguration parameters have been applied. For example, CDATA sections won't be passed to the filter if " cdata-sections" is set to false.
Specified by:
getFilter in interface LSSerializer


getLength

public int getLength()
The number of DOMStrings in the list. The range of valid child node indices is 0 to length-1 inclusive.
Specified by:
getLength in interface DOMStringList


getNewLine

public String getNewLine()
The end-of-line sequence of characters to be used in the XML being written out. Any string is supported, but XML treats only a certain set of characters sequence as end-of-line (See section 2.11, "End-of-Line Handling" in [XML 1.0], if the serialized content is XML 1.0 or section 2.11, "End-of-Line Handling" in [XML 1.1], if the serialized content is XML 1.1). Using other character sequences than the recommended ones can result in a document that is either not serializable or not well-formed).
On retrieval, the default value of this attribute is the implementation specific default end-of-line sequence. DOM implementations should choose the default to match the usual convention for text files in the environment being used. Implementations must choose a default sequence that matches one of those allowed by XML 1.0 or XML 1.1, depending on the serialized content. Setting this attribute to null will reset its value to the default value.
Specified by:
getNewLine in interface LSSerializer


getParameter

public Object getParameter(String name)
            throws DOMException
Return the value of a parameter if known.
Specified by:
getParameter in interface DOMConfiguration

Parameters:
name - The name of the parameter.

Returns:
The current object associated with the specified parameter or null if no object has been associated or if the parameter is not supported.

Throws:
DOMException - NOT_FOUND_ERR: Raised when the parameter name is not recognized.


getParameterNames

public DOMStringList getParameterNames()
The list of the parameters supported by this DOMConfiguration object and for which at least one value can be set by the application. Note that this list can also contain parameter names defined outside this specification.
Specified by:
getParameterNames in interface DOMConfiguration


item

public String item(int i)
Returns the indexth item in the collection. If index is greater than or equal to the number of DOMStrings in the list, this returns null.
Specified by:
item in interface DOMStringList

Parameters:

Returns:
The DOMString at the indexth position in the DOMStringList, or null if that is not a valid index.


serialize

public void serialize(Node node,
                      OutputStream out)
            throws IOException
Overrides:
serialize in interface StreamSerializer


setFilter

public void setFilter(LSSerializerFilter filter)
When the application provides a filter, the serializer will call out to the filter before serializing each Node. The filter implementation can choose to remove the node from the stream or to terminate the serialization early.
The filter is invoked after the operations requested by the DOMConfiguration parameters have been applied. For example, CDATA sections won't be passed to the filter if " cdata-sections" is set to false.
Specified by:
setFilter in interface LSSerializer


setNewLine

public void setNewLine(String newLine)
The end-of-line sequence of characters to be used in the XML being written out. Any string is supported, but XML treats only a certain set of characters sequence as end-of-line (See section 2.11, "End-of-Line Handling" in [XML 1.0], if the serialized content is XML 1.0 or section 2.11, "End-of-Line Handling" in [XML 1.1], if the serialized content is XML 1.1). Using other character sequences than the recommended ones can result in a document that is either not serializable or not well-formed).
On retrieval, the default value of this attribute is the implementation specific default end-of-line sequence. DOM implementations should choose the default to match the usual convention for text files in the environment being used. Implementations must choose a default sequence that matches one of those allowed by XML 1.0 or XML 1.1, depending on the serialized content. Setting this attribute to null will reset its value to the default value.
Specified by:
setNewLine in interface LSSerializer


setParameter

public void setParameter(String name,
                         Object value)
            throws DOMException
Set the value of a parameter.
Specified by:
setParameter in interface DOMConfiguration

Parameters:
name - The name of the parameter to set.
value - The new value or null if the user wishes to unset the parameter. While the type of the value parameter is defined as DOMUserData, the object type must match the type defined by the definition of the parameter. For example, if the parameter is "error-handler", the value must be of type DOMErrorHandler.

Throws:
DOMException - NOT_FOUND_ERR: Raised when the parameter name is not recognized.
NOT_SUPPORTED_ERR: Raised when the parameter name is recognized but the requested value cannot be set.
TYPE_MISMATCH_ERR: Raised if the value type for this parameter name is incompatible with the expected value type.


write

public boolean write(Node node,
                     LSOutput output)
            throws LSException
Serialize the specified node as described above in the general description of the LSSerializer interface. The output is written to the supplied LSOutput.
When writing to a LSOutput, the encoding is found by looking at the encoding information that is reachable through the LSOutput and the item to be written (or its owner document) in this order:
  1. LSOutput.encoding,
  2. Document.inputEncoding,
  3. Document.xmlEncoding.

If no encoding is reachable through the above properties, a default encoding of "UTF-8" will be used. If the specified encoding is not supported an "unsupported-encoding" fatal error is raised.
If no output is specified in the LSOutput, a "no-output-specified" fatal error is raised.
The implementation is responsible of associating the appropriate media type with the serialized data.
When writing to a HTTP URI, a HTTP PUT is performed. When writing to other types of URIs, the mechanism for writing the data to the URI is implementation dependent.
Specified by:
write in interface LSSerializer

Parameters:

Returns:
Returns true if node was successfully serialized. Return false in case the normal processing stopped but the implementation kept serializing the document; the result of the serialization being implementation dependent then.

Throws:
LSException - SERIALIZE_ERR: Raised if the LSSerializer was unable to serialize the node. DOM applications should attach a DOMErrorHandler using the parameter " error-handler" if they wish to get details on the error.


writeToString

public String writeToString(Node node)
            throws DOMException,
                   LSException
Serialize the specified node as described above in the general description of the LSSerializer interface. The output is written to a DOMString that is returned to the caller. The encoding used is the encoding of the DOMString type, i.e. UTF-16. Note that no Byte Order Mark is generated in a DOMString object.
Specified by:
writeToString in interface LSSerializer

Parameters:

Returns:
Returns the serialized data.

Throws:
DOMException - DOMSTRING_SIZE_ERR: Raised if the resulting string is too long to fit in a DOMString.
LSException - SERIALIZE_ERR: Raised if the LSSerializer was unable to serialize the node. DOM applications should attach a DOMErrorHandler using the parameter " error-handler" if they wish to get details on the error.


writeToURI

public boolean writeToURI(Node node,
                          String uri)
            throws LSException
A convenience method that acts as if LSSerializer.write was called with a LSOutput with no encoding specified and LSOutput.systemId set to the uri argument.
Specified by:
writeToURI in interface LSSerializer

Parameters:
uri - The URI to write to.

Returns:
Returns true if node was successfully serialized. Return false in case the normal processing stopped but the implementation kept serializing the document; the result of the serialization being implementation dependent then.

Throws:
LSException - SERIALIZE_ERR: Raised if the LSSerializer was unable to serialize the node. DOM applications should attach a DOMErrorHandler using the parameter " error-handler" if they wish to get details on the error.