com.sun.msv.reader
Class State

java.lang.Object
  com.sun.msv.reader.State

All Implemented Interfaces:

ContentHandler

Direct Known Subclasses:

IgnoreState, NamespaceState, SimpleState

public abstract class State
extends Object
implements ContentHandler

base interface of 'parsing state'. parsing of XML representation of a grammar is done by using various states.

Each State-derived class is responsible for a particular type of declaration of the grammar. For example, SequenceState is responsible for parsing <sequence> element of RELAX module.

State objects interact each other. There are two ways of interaction.

• from parent to child
• from child to parent

The first type of communication occurs only when a child state object is created. The last type of communication occurs usually (but not limited to) when a child state sees its end tag.

In this level of inheritance, contract is somewhat abstract.

1. When a State object is created, its init method is called and various information is set. Particularly, start tag information (if any) and the parent state is set. This process should only be initiated by GrammarReader.
2. After that, startSelf method is called. Usually, this is the place to do something useful.
3. State object is registered as a ContentHandler, and therefore will receive SAX events from now on.
4. Derived classes are expected to do something useful by receiving SAX events.
5. When a State object finishes its own part, it should call GrammarReader.popState method. It will remove the current State object and registers the parent state as a ContentHandler again.

Of course some derived classes introduce more restricted contract. See SimpleState.

this class also provides:

• access to the parent state
• default implementations for all ContentHandler callbacks except startElement and endElement

Author:

Kohsuke KAWAGUCHI

Field Summary

protected String	baseURI base URI for this state.
protected Locator	location Location of the start tag.
protected State	parentState parent state of this state.
GrammarReader	reader reader object who is the owner of this object.
protected StartTagInfo	startTag information of the start tag.

Constructor Summary

State()

Method Summary

static void	_assert(boolean b)
protected Expression	callInterceptExpression(Expression exp)
void	characters(char[] buffer, int from, int len)
void	endPrefixMapping(String prefix)
String	getBaseURI()
Locator	getLocation()
State	getParentState()
StartTagInfo	getStartTag()
void	ignorableWhitespace(char[] buffer, int from, int len)
protected void	init(GrammarReader reader, State parentState, StartTagInfo startTag)
void	processingInstruction(String target, String data)
void	setDocumentLocator(Locator loc)
void	skippedEntity(String name)
void	startDocument()
void	startPrefixMapping(String prefix, String uri)
protected void	startSelf() performs a task that should be done before reading any child elements.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.xml.sax.ContentHandler

endDocument, endElement, startElement

Field Detail

parentState

protected State parentState

parent state of this state. In other words, the parent state is a state who is responsible for the parent element of the current element. For states responsible for the document element, the parent state is a state who is responsible for the entire document. For states responsible for the entire document, the parent state is always null.

reader

public GrammarReader reader

reader object who is the owner of this object. This information is avaiable after init method is called.

startTag

protected StartTagInfo startTag

information of the start tag. This information is avaiable after init method is called.

location

protected Locator location

Location of the start tag. This information is avaiable after init method is called.

baseURI

protected String baseURI

base URI for this state. This information is avaiable after init method is called.

Constructor Detail

State

public State()

Method Detail

getParentState

public final State getParentState()

getStartTag

public StartTagInfo getStartTag()

getLocation

public Locator getLocation()

getBaseURI

public String getBaseURI()

init

protected final void init(GrammarReader reader,
                          State parentState,
                          StartTagInfo startTag)

startSelf

protected void startSelf()

performs a task that should be done before reading any child elements. derived-class can safely read startTag and/or parentState values.

_assert

public static void _assert(boolean b)

characters

public void characters(char[] buffer,
                       int from,
                       int len)
                throws SAXException

Specified by:

characters in interface ContentHandler

Throws:

SAXException

callInterceptExpression

protected final Expression callInterceptExpression(Expression exp)

processingInstruction

public void processingInstruction(String target,
                                  String data)
                           throws SAXException

Specified by:

processingInstruction in interface ContentHandler

Throws:

SAXException

ignorableWhitespace

public void ignorableWhitespace(char[] buffer,
                                int from,
                                int len)
                         throws SAXException

Specified by:

ignorableWhitespace in interface ContentHandler

Throws:

SAXException

skippedEntity

public void skippedEntity(String name)
                   throws SAXException

Specified by:

skippedEntity in interface ContentHandler

Throws:

SAXException

startDocument

public final void startDocument()
                         throws SAXException

Specified by:

startDocument in interface ContentHandler

Throws:

SAXException

setDocumentLocator

public void setDocumentLocator(Locator loc)

Specified by:

setDocumentLocator in interface ContentHandler

startPrefixMapping

public void startPrefixMapping(String prefix,
                               String uri)
                        throws SAXException

Specified by:

startPrefixMapping in interface ContentHandler

Throws:

SAXException

endPrefixMapping

public void endPrefixMapping(String prefix)
                      throws SAXException

Specified by:

endPrefixMapping in interface ContentHandler

Throws:

SAXException