net.sf.saxon.tinytree

Class TinyTreeWalker

public class TinyTreeWalker extends Object implements PullProvider, SourceLocator

This implementation of the Saxon pull interface starts from a document, element, text, comment, or processing-instruction node in a TinyTree, and returns the events corresponding to that node and its descendants (including their attributes and namespaces). The class performs the same function as the general-purpose TreeWalker class, but is specialized to exploit the TinyTree data structure: in particular, it never materializes any Node objects.
Constructor Summary
TinyTreeWalker(TinyNodeImpl startNode)
Create a TinyTreeWalker to return events associated with a tree or subtree
Method Summary
voidclose()
Close the event reader.
intcurrent()
Get the event most recently returned by next(), or by other calls that change the position, for example getStringValue() and skipToMatchingEnd().
AtomicValuegetAtomicValue()
Get an atomic value.
AttributeCollectiongetAttributes()
Get the attributes associated with the current element.
intgetColumnNumber()
Return the character position where the current document event ends.
intgetFingerprint()
Get the fingerprint of the name of the element.
intgetLineNumber()
Return the line number where the current document event ends.
intgetNameCode()
Get the nameCode identifying the name of the current node.
NamePoolgetNamePool()
Get the namePool used to lookup all name codes and namespace codes
NamespaceDeclarationsgetNamespaceDeclarations()
Get the namespace declarations associated with the current element.
PipelineConfigurationgetPipelineConfiguration()
Get configuration information.
StringgetPublicId()
Return the public identifier for the current document event.
SourceLocatorgetSourceLocator()
Get the location of the current event.
CharSequencegetStringValue()
Get the string value of the current attribute, text node, processing-instruction, or atomic value.
StringgetSystemId()
Return the system identifier for the current document event.
intgetTypeAnnotation()
Get the type annotation of the current attribute or element node, or atomic value.
intnext()
Get the next event
voidsetPipelineConfiguration(PipelineConfiguration pipe)
Set configuration information.
intskipToMatchingEnd()
Skip the current subtree.

Constructor Detail

TinyTreeWalker

public TinyTreeWalker(TinyNodeImpl startNode)
Create a TinyTreeWalker to return events associated with a tree or subtree

Parameters: startNode the root of the tree or subtree. Must be a document, element, text, comment, or processing-instruction node.

Throws: IllegalArgumentException if the start node is an attribute or namespace node.

Method Detail

close

public void close()
Close the event reader. This indicates that no further events are required. It is not necessary to close an event reader after TinyTreeWalker has been reported, but it is recommended to close it if reading terminates prematurely. Once an event reader has been closed, the effect of further calls on next() is undefined.

current

public int current()
Get the event most recently returned by next(), or by other calls that change the position, for example getStringValue() and skipToMatchingEnd(). This method does not change the position of the PullProvider.

Returns: the current event

getAtomicValue

public AtomicValue getAtomicValue()
Get an atomic value. This call may be used only when the last event reported was ATOMIC_VALUE. This indicates that the PullProvider is reading a sequence that contains a free-standing atomic value; it is never used when reading the content of a node.

getAttributes

public AttributeCollection getAttributes()
Get the attributes associated with the current element. This method must be called only after a START_ELEMENT event has been notified. The contents of the returned AttributeCollection are guaranteed to remain unchanged until the next START_ELEMENT event, but may be modified thereafter. The object should not be modified by the client.

Attributes may be read before or after reading the namespaces of an element, but must not be read after the first child node has been read, or after calling one of the methods skipToEnd(), getStringValue(), or getTypedValue().

Returns: an AttributeCollection representing the attributes of the element that has just been notified.

getColumnNumber

public int getColumnNumber()
Return the character position where the current document event ends.

Warning: The return value from the method is intended only as an approximation for the sake of error reporting; it is not intended to provide sufficient information to edit the character content of the original XML document.

The return value is an approximation of the column number in the document entity or external parsed entity where the markup that triggered the event appears.

Returns: The column number, or -1 if none is available.

See Also: TinyTreeWalker

getFingerprint

public int getFingerprint()
Get the fingerprint of the name of the element. This is similar to the nameCode, except that it does not contain any information about the prefix: so two elements with the same fingerprint have the same name, excluding prefix. This method can be used after the TinyTreeWalker, TinyTreeWalker, TinyTreeWalker, TinyTreeWalker, or TinyTreeWalker events. If called at other times, the result is undefined and may result in an IllegalStateException. If called when the current node is an unnamed namespace node (a node representing the default namespace) the returned value is -1.

Returns: the fingerprint. The fingerprint can be used to obtain the local name and namespace URI from the name pool.

getLineNumber

public int getLineNumber()
Return the line number where the current document event ends.

Warning: The return value from the method is intended only as an approximation for the sake of error reporting; it is not intended to provide sufficient information to edit the character content of the original XML document.

The return value is an approximation of the line number in the document entity or external parsed entity where the markup that triggered the event appears.

Returns: The line number, or -1 if none is available.

See Also: TinyTreeWalker

getNameCode

public int getNameCode()
Get the nameCode identifying the name of the current node. This method can be used after the TinyTreeWalker, TinyTreeWalker, TinyTreeWalker, or TinyTreeWalker events. With some PullProvider implementations, including this one, it can also be used after TinyTreeWalker. If called at other times, the result is undefined and may result in an IllegalStateException. If called when the current node is an unnamed namespace node (a node representing the default namespace) the returned value is -1.

Returns: the nameCode. The nameCode can be used to obtain the prefix, local name, and namespace URI from the name pool.

getNamePool

public NamePool getNamePool()
Get the namePool used to lookup all name codes and namespace codes

Returns: the namePool

getNamespaceDeclarations

public NamespaceDeclarations getNamespaceDeclarations()
Get the namespace declarations associated with the current element. This method must be called only after a START_ELEMENT event has been notified. In the case of a top-level START_ELEMENT event (that is, an element that either has no parent node, or whose parent is not included in the sequence being read), the NamespaceDeclarations object returned will contain a namespace declaration for each namespace that is in-scope for this element node. In the case of a non-top-level element, the NamespaceDeclarations will contain a set of namespace declarations and undeclarations, representing the differences between this element and its parent.

It is permissible for this method to return namespace declarations that are redundant.

The NamespaceDeclarations object is guaranteed to remain unchanged until the next START_ELEMENT event, but may then be overwritten. The object should not be modified by the client.

Namespaces may be read before or after reading the attributes of an element, but must not be read after the first child node has been read, or after calling one of the methods skipToEnd(), getStringValue(), or getTypedValue().

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getPipelineConfiguration

public PipelineConfiguration getPipelineConfiguration()
Get configuration information.

getPublicId

public String getPublicId()
Return the public identifier for the current document event.

The return value is the public identifier of the document entity or of the external parsed entity in which the markup that triggered the event appears.

Returns: A string containing the public identifier, or null if none is available.

See Also: TinyTreeWalker

getSourceLocator

public SourceLocator getSourceLocator()
Get the location of the current event. For an event stream representing a real document, the location information should identify the location in the lexical XML source. For a constructed document, it should identify the location in the query or stylesheet that caused the node to be created. A value of null can be returned if no location information is available.

getStringValue

public CharSequence getStringValue()
Get the string value of the current attribute, text node, processing-instruction, or atomic value. This method cannot be used to obtain the string value of an element, or of a namespace node. If the most recent event was anything other than TinyTreeWalker, TinyTreeWalker, TinyTreeWalker, or TinyTreeWalker, the result is undefined.

getSystemId

public String getSystemId()
Return the system identifier for the current document event.

The return value is the system identifier of the document entity or of the external parsed entity in which the markup that triggered the event appears.

If the system identifier is a URL, the parser must resolve it fully before passing it to the application.

Returns: A string containing the system identifier, or null if none is available.

See Also: TinyTreeWalker

getTypeAnnotation

public int getTypeAnnotation()
Get the type annotation of the current attribute or element node, or atomic value. The result of this method is undefined unless the most recent event was START_ELEMENT, START_CONTENT, ATTRIBUTE, or ATOMIC_VALUE.

Returns: the type code. This code is the fingerprint of a type name, which may be resolved to a SchemaType by access to the Configuration.

next

public int next()
Get the next event

Returns: an integer code indicating the type of event. The code TinyTreeWalker is returned if there are no more events to return.

setPipelineConfiguration

public void setPipelineConfiguration(PipelineConfiguration pipe)
Set configuration information. This must only be called before any events have been read.

skipToMatchingEnd

public int skipToMatchingEnd()
Skip the current subtree. This method may be called only immediately after a START_DOCUMENT or START_ELEMENT event. This call returns the matching END_DOCUMENT or END_ELEMENT event; the next call on next() will return the event following the END_DOCUMENT or END_ELEMENT.