com.fasterxml.aalto.dom

Class OutputElementBase

java.lang.Object

com.fasterxml.aalto.dom.OutputElementBase

All Implemented Interfaces:

NamespaceContext

Direct Known Subclasses:

DOMOutputElement

public abstract class OutputElementBase
extends Object
implements NamespaceContext

Class that encapsulates information about a specific element in virtual output stack for namespace-aware writers. It provides support for URI-to-prefix mappings as well as namespace mapping generation.

One noteworthy feature of the class is that it is designed to allow "short-term recycling", ie. instances can be reused within context of a simple document output. While reuse/recycling of such lightweight object is often useless or even counter productive, here it may be worth using, due to simplicity of the scheme (basically using a very simple free-elements linked list).

Field Summary

Fields

Modifier and Type	Field and Description
protected String	_defaultNsURI
protected BijectiveNsMap	_nsMapping Mapping of namespace prefixes to URIs and back.
protected boolean	_nsMapShared True, if _nsMapping is a shared copy from the parent; false if a local copy was created (which happens when namespaces get bound etc).
protected NamespaceContext	_rootNsContext Namespace context end application may have supplied, and that (if given) should be used to augment explicitly defined bindings.
static int	PREFIX_MISBOUND
static int	PREFIX_OK
static int	PREFIX_UNBOUND

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	OutputElementBase() Constructor for the virtual root element
protected	OutputElementBase(OutputElementBase parent, BijectiveNsMap ns)

Method Summary

Methods

Modifier and Type	Method and Description
void	addPrefix(String prefix, String uri)
String	generateMapping(String prefixBase, String uri, int[] seqArr)
String	getDefaultNsUri()
String	getExplicitPrefix(String uri) Method similar to getPrefix(java.lang.String), but one that will not accept the default namespace, only an explicit one.
abstract String	getNameDesc()
String	getNamespaceURI(String prefix)
String	getPrefix(String uri)
Iterator<String>	getPrefixes(String uri)
int	isPrefixValid(String prefix, String nsURI, boolean isElement) Method that verifies that passed-in prefix indeed maps to the specified namespace URI; and depending on how it goes returns a status for caller.
abstract boolean	isRoot()
protected void	relink(OutputElementBase parent) Method called to reuse a pooled instance.
abstract void	setDefaultNsUri(String uri)
protected abstract void	setRootNsContext(NamespaceContext ctxt)
protected void	throwOutputError(String msg)

Methods inherited from class java.lang.Object

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

Field Detail

PREFIX_UNBOUND

public static final int PREFIX_UNBOUND

See Also:

Constant Field Values

PREFIX_OK

public static final int PREFIX_OK

See Also:

Constant Field Values

PREFIX_MISBOUND

public static final int PREFIX_MISBOUND

See Also:

Constant Field Values

_rootNsContext

protected NamespaceContext _rootNsContext

Namespace context end application may have supplied, and that (if given) should be used to augment explicitly defined bindings.

_defaultNsURI

protected String _defaultNsURI

_nsMapping

protected BijectiveNsMap _nsMapping

Mapping of namespace prefixes to URIs and back.

_nsMapShared

protected boolean _nsMapShared

True, if _nsMapping is a shared copy from the parent; false if a local copy was created (which happens when namespaces get bound etc).

Constructor Detail

OutputElementBase

protected OutputElementBase()

Constructor for the virtual root element

OutputElementBase

protected OutputElementBase(OutputElementBase parent,
                 BijectiveNsMap ns)

Method Detail

relink

protected void relink(OutputElementBase parent)

Method called to reuse a pooled instance.

setRootNsContext

protected abstract void setRootNsContext(NamespaceContext ctxt)

isRoot

public abstract boolean isRoot()

getNameDesc

public abstract String getNameDesc()

Returns:

String presentation of the fully-qualified name, in "prefix:localName" format (no URI). Useful for error and debugging messages.

getDefaultNsUri

public final String getDefaultNsUri()

getExplicitPrefix

public final String getExplicitPrefix(String uri)

Method similar to getPrefix(java.lang.String), but one that will not accept the default namespace, only an explicit one. Usually used when trying to find a prefix for attributes.

isPrefixValid

public final int isPrefixValid(String prefix,
                String nsURI,
                boolean isElement)
                        throws XMLStreamException

Method that verifies that passed-in prefix indeed maps to the specified namespace URI; and depending on how it goes returns a status for caller.

Parameters:

isElement - If true, rules for the default NS are those of elements (ie. empty prefix can map to non-default namespace); if false, rules are those of attributes (only non-default prefix can map to a non-default namespace).

Returns:

PREFIX_OK, if passed-in prefix matches matched-in namespace URI in current scope; PREFIX_UNBOUND if it's not bound to anything, and PREFIX_MISBOUND if it's bound to another URI.

Throws:

XMLStreamException - True if default (no) prefix is allowed to match a non-default URI (elements); false if not (attributes)

setDefaultNsUri

public abstract void setDefaultNsUri(String uri)

generateMapping

public final String generateMapping(String prefixBase,
                     String uri,
                     int[] seqArr)

addPrefix

public final void addPrefix(String prefix,
             String uri)

getNamespaceURI

public final String getNamespaceURI(String prefix)

Specified by:

getNamespaceURI in interface NamespaceContext

getPrefix

public final String getPrefix(String uri)

Specified by:

getPrefix in interface NamespaceContext

getPrefixes

public final Iterator<String> getPrefixes(String uri)

Specified by:

getPrefixes in interface NamespaceContext

throwOutputError

protected final void throwOutputError(String msg)
                               throws XMLStreamException

Throws:

XMLStreamException