org.w3c.dom.ls

Interface LSParser

public interface LSParser

An interface to an object that is able to build, or augment, a DOM tree from various input sources.

LSParser provides an API for parsing XML and building the corresponding DOM document structure. A LSParser instance can be obtained by invoking the DOMImplementationLS.createLSParser() method.

As specified in [DOM Level 3 Core] , when a document is first made available via the LSParser:

Asynchronous LSParser objects are expected to also implement the events::EventTarget interface so that event listeners can be registered on asynchronous LSParser objects.

Events supported by asynchronous LSParser objects are:

LSParserLSLoadEvent
LSParserLSProgressEvent

Note: All events defined in this specification use the namespace URI "http://www.w3.org/2002/DOMLS".

While parsing an input source, errors are reported to the application through the error handler (LSParser.domConfig's " error-handler" parameter). This specification does in no way try to define all possible errors that can occur while parsing XML, or any other markup, but some common error cases are defined. The types (DOMError.type) of errors and warnings defined by this specification are:

"check-character-normalization-failure" [error]
check-character-normalization
"doctype-not-allowed" [fatal]
true
"no-input-specified" [fatal]
LSInput
"pi-base-uri-not-preserved" [warning]
entitiesfalse
 <!DOCTYPE root [ <!ENTITY e SYSTEM 'subdir/myentity.ent' ]> 
 <root> &e; </root>
subdir/myentity.ent
<one> <two/> </one> <?pi 3.14159?> 
 <more/>
"unbound-prefix-in-entity" [warning]
namespacestrue
"unknown-character-denormalization" [fatal]
false
"unsupported-encoding" [fatal]
"unsupported-media-type" [fatal]
true

In addition to raising the defined errors and warnings, implementations are expected to raise implementation specific errors and warnings for any other error and warning cases such as IO errors (file not found, permission denied,...), XML well-formedness errors, and so on.

See also the Document Object Model (DOM) Level 3 Load and Save Specification.

Field Summary

static short
ACTION_APPEND_AS_CHILDREN
Append the result of the parse operation as children of the context node.
static short
ACTION_INSERT_AFTER
Insert the result of the parse operation as the immediately following sibling of the context node.
static short
ACTION_INSERT_BEFORE
Insert the result of the parse operation as the immediately preceding sibling of the context node.
static short
ACTION_REPLACE
Replace the context node with the result of the parse operation.
static short
ACTION_REPLACE_CHILDREN
Replace all the children of the context node with the result of the parse operation.

Method Summary

void
abort()
Abort the loading of the document that is currently being loaded by the LSParser.
boolean
getAsync()
true if the LSParser is asynchronous, false if it is synchronous.
boolean
getBusy()
true if the LSParser is currently busy loading a document, otherwise false.
DOMConfiguration
getDomConfig()
The DOMConfiguration object used when parsing an input source.
LSParserFilter
getFilter()
When a filter is provided, the implementation will call out to the filter as it is constructing the DOM tree structure.
Document
parse(LSInput input)
Parse an XML document from a resource identified by a LSInput.
Document
parseURI(String uri)
Parse an XML document from a location identified by a URI reference [IETF RFC 2396].
Node
parseWithContext(LSInput input, Node contextArg, short action)
Parse an XML fragment from a resource identified by a LSInput and insert the content into an existing document at the position specified with the context and action arguments.
void
setFilter(LSParserFilter filter)
When a filter is provided, the implementation will call out to the filter as it is constructing the DOM tree structure.

Field Details

ACTION_APPEND_AS_CHILDREN

public static final short ACTION_APPEND_AS_CHILDREN
Append the result of the parse operation as children of the context node. For this action to work, the context node must be an Element or a DocumentFragment.
Field Value:
1

ACTION_INSERT_AFTER

public static final short ACTION_INSERT_AFTER
Insert the result of the parse operation as the immediately following sibling of the context node. For this action to work the context node's parent must be an Element or a DocumentFragment.
Field Value:
4

ACTION_INSERT_BEFORE

public static final short ACTION_INSERT_BEFORE
Insert the result of the parse operation as the immediately preceding sibling of the context node. For this action to work the context node's parent must be an Element or a DocumentFragment.
Field Value:
3

ACTION_REPLACE

public static final short ACTION_REPLACE
Replace the context node with the result of the parse operation. For this action to work, the context node must have a parent, and the parent must be an Element or a DocumentFragment.
Field Value:
5

ACTION_REPLACE_CHILDREN

public static final short ACTION_REPLACE_CHILDREN
Replace all the children of the context node with the result of the parse operation. For this action to work, the context node must be an Element, a Document, or a DocumentFragment.
Field Value:
2

Method Details

abort

public void abort()
Abort the loading of the document that is currently being loaded by the LSParser. If the LSParser is currently not busy, a call to this method does nothing.

getAsync

public boolean getAsync()
true if the LSParser is asynchronous, false if it is synchronous.

getBusy

public boolean getBusy()
true if the LSParser is currently busy loading a document, otherwise false.

getDomConfig

public DOMConfiguration getDomConfig()
The DOMConfiguration object used when parsing an input source. This DOMConfiguration is specific to the parse operation. No parameter values from this DOMConfiguration object are passed automatically to the DOMConfiguration object on the Document that is created, or used, by the parse operation. The DOM application is responsible for passing any needed parameter values from this DOMConfiguration object to the DOMConfiguration object referenced by the Document object.
In addition to the parameters recognized in on the DOMConfiguration interface defined in [DOM Level 3 Core] , the DOMConfiguration objects for LSParser add or modify the following parameters:
"charset-overrides-xml-encoding"
true
optionaldefaultIETF RFC 2616XML 1.0LSInput
false
required
"disallow-doctype"
true
optional"doctype-not-allowed"
false
requireddefault
"ignore-unknown-character-denormalizations"
true
requireddefaultXML 1.1XML 1.0
false
optional"unknown-character-denormalization"
"infoset"
DOMConfigurationDOM Level 3 CoretrueLSParser
"namespaces"
true
requireddefaultXML NamespacesXML Namespaces 1.1
false
optional
"resource-resolver"
requiredLSResourceResolverLSResourceResolver
"supported-media-types-only"
true
optional"unsupported-media-type"IETF RFC 3023
false
requireddefault
"validate"
DOMConfigurationDOM Level 3 Corefalse
"validate-if-schema"
DOMConfigurationDOM Level 3 Corefalse
"well-formed"
DOMConfigurationDOM Level 3 Corefalse

getFilter

public LSParserFilter getFilter()
When a filter is provided, the implementation will call out to the filter as it is constructing the DOM tree structure. The filter can choose to remove elements from the document being constructed, or to terminate the parsing early.
The filter is invoked after the operations requested by the DOMConfiguration parameters have been applied. For example, if " validate" is set to true, the validation is done before invoking the filter.

parse

public Document parse(LSInput input)
            throws DOMException,
                   LSException
Parse an XML document from a resource identified by a LSInput.
Parameters:
input - The LSInput from which the source of the document is to be read.
Returns:
If the LSParser is a synchronous LSParser, the newly created and populated Document is returned. If the LSParser is asynchronous, null is returned since the document object may not yet be constructed when this method returns.
Throws:
DOMException - INVALID_STATE_ERR: Raised if the LSParser's LSParser.busy attribute is true.
LSException - PARSE_ERR: Raised if the LSParser was unable to load the XML document. DOM applications should attach a DOMErrorHandler using the parameter " error-handler" if they wish to get details on the error.

parseURI

public Document parseURI(String uri)
            throws DOMException,
                   LSException
Parse an XML document from a location identified by a URI reference [IETF RFC 2396]. If the URI contains a fragment identifier (see section 4.1 in [IETF RFC 2396]), the behavior is not defined by this specification, future versions of this specification may define the behavior.
Parameters:
uri - The location of the XML document to be read.
Returns:
If the LSParser is a synchronous LSParser, the newly created and populated Document is returned, or null if an error occured. If the LSParser is asynchronous, null is returned since the document object may not yet be constructed when this method returns.
Throws:
DOMException - INVALID_STATE_ERR: Raised if the LSParser.busy attribute is true.
LSException - PARSE_ERR: Raised if the LSParser was unable to load the XML document. DOM applications should attach a DOMErrorHandler using the parameter " error-handler" if they wish to get details on the error.

parseWithContext

public Node parseWithContext(LSInput input,
                             Node contextArg,
                             short action)
            throws DOMException,
                   LSException
Parse an XML fragment from a resource identified by a LSInput and insert the content into an existing document at the position specified with the context and action arguments. When parsing the input stream, the context node (or its parent, depending on where the result will be inserted) is used for resolving unbound namespace prefixes. The context node's ownerDocument node (or the node itself if the node of type DOCUMENT_NODE) is used to resolve default attributes and entity references.
As the new data is inserted into the document, at least one mutation event is fired per new immediate child or sibling of the context node.
If the context node is a Document node and the action is ACTION_REPLACE_CHILDREN, then the document that is passed as the context node will be changed such that its xmlEncoding, documentURI, xmlVersion, inputEncoding, xmlStandalone, and all other such attributes are set to what they would be set to if the input source was parsed using LSParser.parse().
This method is always synchronous, even if the LSParser is asynchronous (LSParser.async is true).
If an error occurs while parsing, the caller is notified through the ErrorHandler instance associated with the " error-handler" parameter of the DOMConfiguration.
When calling parseWithContext, the values of the following configuration parameters will be ignored and their default values will always be used instead: " validate", " validate-if-schema", and " element-content-whitespace". Other parameters will be treated normally, and the parser is expected to call the LSParserFilter just as if a whole document was parsed.
Parameters:
input - The LSInput from which the source document is to be read. The source document must be an XML fragment, i.e. anything except a complete XML document (except in the case where the context node of type DOCUMENT_NODE, and the action is ACTION_REPLACE_CHILDREN), a DOCTYPE (internal subset), entity declaration(s), notation declaration(s), or XML or text declaration(s).
contextArg - The node that is used as the context for the data that is being parsed. This node must be a Document node, a DocumentFragment node, or a node of a type that is allowed as a child of an Element node, e.g. it cannot be an Attribute node.
action - This parameter describes which action should be taken between the new set of nodes being inserted and the existing children of the context node. The set of possible actions is defined in ACTION_TYPES above.
Returns:
Return the node that is the result of the parse operation. If the result is more than one top-level node, the first one is returned.
Throws:
DOMException - HIERARCHY_REQUEST_ERR: Raised if the content cannot replace, be inserted before, after, or as a child of the context node (see also Node.insertBefore or Node.replaceChild in [DOM Level 3 Core] ).
NOT_SUPPORTED_ERR: Raised if the LSParser doesn't support this method, or if the context node is of type Document and the DOM implementation doesn't support the replacement of the DocumentType child or Element child.
NO_MODIFICATION_ALLOWED_ERR: Raised if the context node is a read only node and the content is being appended to its child list, or if the parent node of the context node is read only node and the content is being inserted in its child list.
INVALID_STATE_ERR: Raised if the LSParser.busy attribute is true.
LSException - PARSE_ERR: Raised if the LSParser was unable to load the XML fragment. DOM applications should attach a DOMErrorHandler using the parameter " error-handler" if they wish to get details on the error.

setFilter

public void setFilter(LSParserFilter filter)
When a filter is provided, the implementation will call out to the filter as it is constructing the DOM tree structure. The filter can choose to remove elements from the document being constructed, or to terminate the parsing early.
The filter is invoked after the operations requested by the DOMConfiguration parameters have been applied. For example, if " validate" is set to true, the validation is done before invoking the filter.

* Copyright (c) 2004 World Wide Web Consortium, * * (Massachusetts Institute of Technology, European Research Consortium for * Informatics and Mathematics, Keio University). All Rights Reserved. This * work is distributed under the W3C(r) Software License [1] in the hope that * it will be useful, but WITHOUT ANY WARRANTY; without even the implied * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * * [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231