ptolemy.vergil.actor

Class DocManager

java.lang.Object

com.microstar.xml.HandlerBase

ptolemy.vergil.actor.DocManager

All Implemented Interfaces:

XmlHandler

public class DocManager
extends HandlerBase

A manager for documentation for an associated Ptolemy II object. The constructor specifies the associated Ptolemy II object, and then various methods provide access to portions of the documentation. For example, the getDescription() method returns a description of the object. The getPortDoc() method returns a description of the specified port.

The documentation is constructed by a multi-tiered method. The first level of information is provided by an attribute named DOC_ATTRIBUTE_NAME contained by the object. The second level of information is provided by an XML file in the same package as the class of the associated object. The name of the XML file is "xDoc.xml", where x is the name of the class of the object. The third level of information is provided by an XML file associated with the base class of the associated object. The remaining levels are provided by searching up the inheritance hierarchy. When a method of the DocManager class is invoked to get documentation information, this class looks first in the first tier for the information. If the information is not present in the first tier, then it looks in the second tier, etc. If the information is not present in any tier, then it returns a string indicating that there is no information. Except for the first tier, the documentation information is constructed lazily, only when the methods to access the information are invoked, and only if the first tier has not provided the information.

If the information is found but is malformed, then all information methods return a description of the error.

At all tiers, the documentation information is given in XML with a specified DTD.

A doc file should be an XML file beginning with

 <?xml version="1.0" standalone="yes"?>
 <!DOCTYPE doc PUBLIC "-//UC Berkeley//DTD DocML 1//EN"
 "http://ptolemy.eecs.berkeley.edu/xml/dtd/DocML_1.dtd">
 

and should then have a top-level element of the form

 <doc name="actorName" class="actorClass">
 

The main description is text included within the description element, as in

 <description>
 description here
 </description>
 

The description can include HTML formatting, although any < and > should be escaped and represented as &lt; and &gt;.

Additional information can be provided in the author, version, since, Pt.ProposedRating, and Pt.AcceptedRating elements. These are, like the description, simple text that gets rendered (and HTML formatted) in the documentation.

Documentation for ports and parameters is given using the following forms:

 <port name="portName"
 documentation
 </port>
 <property name="parameterName"
 documentation
 </property>
 

The use of the "property" keyword matches MoML.

Since:

Ptolemy II 5.2

Version:

$Id$

Author:

Edward A. Lee

Pt.AcceptedRating:

Red (cxh)

Pt.ProposedRating:

Red (eal)

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	DocML_DTD_1 The standard DocML DTD, represented as a string.

Constructor Summary

Constructors

Constructor and Description
DocManager(Configuration configuration, java.lang.Class targetClass) Construct a manager to handle documentation for the specified target class.
DocManager(Configuration configuration, NamedObj target) Construct a manager to handle documentation for the specified target.
DocManager(Configuration configuration, java.net.URL url) Construct a manager for documentation at the specified URL.

Method Summary

Modifier and Type	Method and Description
protected void	_checkForNull(java.lang.Object object, java.lang.String message) If the argument is null, throw an exception with the given message.
protected java.lang.String	_currentExternalEntity() Get the the URI for the current external entity.
void	attribute(java.lang.String name, java.lang.String value, boolean specified) Handle an attribute assignment that is part of an XML element.
void	charData(char[] chars, int offset, int length) Handle character data.
static java.net.URL	docClassNameToURL(Configuration configuration, java.lang.String className, boolean lookForPtDoc, boolean lookForJavadoc, boolean lookForSource, boolean lookForActorIndex) Given a dot separated class name, return the URL of the documentation.
void	endDocument() End the document.
void	endElement(java.lang.String elementName) End an element.
void	error(java.lang.String message, java.lang.String systemID, int line, int column) Indicate a fatal XML parsing error.
java.lang.String	getAcceptedRating() Return the Pt.AcceptedRating field, or null if none has been given.
java.lang.String	getAuthor() Return the author field, or the string "No author given" if none has been given.
java.lang.String	getClassName() Return the class name, or null if none has been given.
java.lang.String	getDescription() Return the description, or null if none has been given.
DocManager	getNextTier() Return next tier, if there is one.
java.lang.String	getPortDoc(java.lang.String name) Return the documentation for the specified port, or null if there is none.
java.lang.String	getPropertyDoc(java.lang.String name) Return the documentation for the specified property (parameter or attribute), or null if there is none.
java.lang.String	getProposedRating() Return the Pt.ProposedRating field, or null if none has been given.
static java.lang.String	getRemoteDocumentationURLBase() Get the location of the website documentation.
java.lang.String	getSeeAlso() Return "see also" information.
java.lang.String	getSince() Return the since field, or null if none has been given.
java.lang.Class	getTargetClass() Return the class of the target.
java.lang.String	getVersion() Return the version field, or null if none has been given.
boolean	hadException() Return true if an exception was encountered parsing the DocML data.
boolean	isInstanceDoc() Return true if the primary source of documentation is the instance.
boolean	isTargetInstantiableAttribute() Return true if the target class is a subclass of Attribute that has a two-argument constructor compatible where the first argument is a CompositeEntity and the second is a String.
boolean	isTargetInstantiableEntity() Return true if the target class is a subclass of Entity that has a two-argument constructor compatible where the first argument is a CompositeEntity and the second is a String.
boolean	isTargetInstantiablePort() Return true if the target class is a subclass of Port that has a two-argument constructor compatible where the first argument is a CompositeEntity and the second is a String.
void	parse(java.lang.String text) Parse the given text as DocML.
void	parse(java.net.URL base, java.io.InputStream input) Parse the given stream as a DocML file.
void	parse(java.net.URL base, java.io.Reader reader) Parse the given stream as a DocML file.
java.lang.Object	resolveEntity(java.lang.String publicID, java.lang.String systemID) Resolve an external entity.
static void	setRemoteDocumentationURLBase(java.lang.String remoteDocumentationURLBase) Set the location of the remote documentation.
void	startDocument() Start a document.
void	startElement(java.lang.String elementName) Start an element.
void	startExternalEntity(java.lang.String systemID) Handle the start of an external entity.

Methods inherited from class com.microstar.xml.HandlerBase

doctypeDecl, endExternalEntity, ignorableWhitespace, processingInstruction

Methods inherited from class java.lang.Object

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

Field Detail

DocML_DTD_1

public static final java.lang.String DocML_DTD_1

The standard DocML DTD, represented as a string. This is used to parse DocML data when a compatible PUBLIC DTD is specified.

See Also:

Constant Field Values

Constructor Detail

DocManager

public DocManager(Configuration configuration,
                  NamedObj target)

Construct a manager to handle documentation for the specified target.

Parameters:

configuration - The configuration in which to look up the _docApplicationSpecializer and _applicationName parameters

target - The object to be documented.

DocManager

public DocManager(Configuration configuration,
                  java.lang.Class targetClass)

Construct a manager to handle documentation for the specified target class.

Parameters:

configuration - The configuration in which to look up the _docApplicationSpecializer and _applicationName parameters

targetClass - The class to be documented.

DocManager

public DocManager(Configuration configuration,
                  java.net.URL url)

Construct a manager for documentation at the specified URL.

Parameters:

configuration - The configuration in which to look up the _docApplicationSpecializer and _applicationName parameters

url - The URL.

Method Detail

attribute

public void attribute(java.lang.String name,
                      java.lang.String value,
                      boolean specified)
               throws XmlException

Handle an attribute assignment that is part of an XML element. This method is called prior to the corresponding startElement() call, so it simply accumulates attributes in a hashtable for use by startElement().

Specified by:

attribute in interface XmlHandler

Overrides:

attribute in class HandlerBase

Parameters:

name - The name of the attribute.

value - The value of the attribute, or null if the attribute is #IMPLIED and not specified.

specified - True if the value is specified, false if the value comes from the default value in the DTD rather than from the XML file.

Throws:

XmlException - If the name or value is null.

See Also:

XmlHandler.attribute(java.lang.String, java.lang.String, boolean)

docClassNameToURL

public static java.net.URL docClassNameToURL(Configuration configuration,
                                             java.lang.String className,
                                             boolean lookForPtDoc,
                                             boolean lookForJavadoc,
                                             boolean lookForSource,
                                             boolean lookForActorIndex)

Given a dot separated class name, return the URL of the documentation.

If the configuration has a parameter _docApplicationSpecializer and that parameter names a class that that implements the DocApplicationSpecializer interface, then we pass the class name to DocApplicationSpecializer.docClassNameToURL(String, String, boolean, boolean, boolean, boolean) and if a non-null is returned from docClassNameToURL(), we return that value.

If the configuration has a parameter _applicationName, then we search in doc/codeDocapplicationName for the PtDoc, Javadoc and Actor Index files. Otherwise, we search in doc/codeDoc. Source files are searched for in the classpath by using getResource().

The lookForPtDoc, lookForJavadoc, lookForSource and lookForActorIndex parameters control which documents are searched for. The documents are searched in the same order as the parameters that have true values, that is if the parameters are true, true, false, false, then if the the PtDoc .xml file is searched for locally, then the Javadoc .html file is search for locally and then if the _remoteDocumentation base attribute is set the PtDoc .xml file is searched for on the remote host and then the Javadoc .html file is search for on the remote host.

Parameters:

configuration - The configuration in which to look up the _docApplicationSpecializer and _applicationName parameters

className - The dot separated class name.

lookForPtDoc - True if we should look for ptdoc .xml files.

lookForJavadoc - True if we should look for javadoc files.

lookForSource - True if we should look for source files. Note that lookForPtDoc and lookForJavadoc must both be false for the source code to be found.

lookForActorIndex - True if we should look for the actor index.

Returns:

The URL of the documentation, if any. If no documentation was found, return null.

charData

public void charData(char[] chars,
                     int offset,
                     int length)

Handle character data. In this implementation, the character data is accumulated in a buffer until the end element. Ælfred will call this method once for each chunk of character data found in the contents of elements. Note that the parser may break up a long sequence of characters into smaller chunks and call this method once for each chunk.

Specified by:

charData in interface XmlHandler

Overrides:

charData in class HandlerBase

Parameters:

chars - The character data.

offset - The starting position in the array.

length - The number of characters available.

See Also:

XmlHandler.charData(char[], int, int)

endDocument

public void endDocument()
                 throws java.lang.Exception

End the document. In this implementation, do nothing. Ælfred will call this method once, when it has finished parsing the XML document. It is guaranteed that this will be the last method called.

Specified by:

endDocument in interface XmlHandler

Overrides:

endDocument in class HandlerBase

Throws:

java.lang.Exception - The handler may throw any exception.

See Also:

XmlHandler.endDocument()

endElement

public void endElement(java.lang.String elementName)
                throws java.lang.Exception

End an element. Ælfred will call this method at the end of each element (including EMPTY elements).

Specified by:

endElement in interface XmlHandler

Overrides:

endElement in class HandlerBase

Parameters:

elementName - The element type name.

Throws:

java.lang.Exception - Not thrown in this base class.

See Also:

XmlHandler.endElement(java.lang.String)

error

public void error(java.lang.String message,
                  java.lang.String systemID,
                  int line,
                  int column)
           throws XmlException

Indicate a fatal XML parsing error. Ælfred will call this method whenever it encounters a serious error. This method simply throws an XmlException.

Specified by:

error in interface XmlHandler

Overrides:

error in class HandlerBase

Parameters:

message - The error message.

systemID - The URI of the entity that caused the error.

line - The approximate line number of the error.

column - The approximate column number of the error.

Throws:

XmlException - If called.

See Also:

XmlHandler.error(java.lang.String, java.lang.String, int, int)

getAcceptedRating

public java.lang.String getAcceptedRating()

Return the Pt.AcceptedRating field, or null if none has been given. Note that unlike some of the other fields, this does not delegate to the next tier if no since field has been given.

Returns:

The Pt.AcceptedRating field.

getAuthor

public java.lang.String getAuthor()

Return the author field, or the string "No author given" if none has been given. Note that unlike some of the other fields, this does not delegate to the next tier if no author has been given.

Returns:

The author field.

getClassName

public java.lang.String getClassName()

Return the class name, or null if none has been given.

Returns:

The class name.

getDescription

public java.lang.String getDescription()

Return the description, or null if none has been given.

Returns:

The description.

getNextTier

public DocManager getNextTier()

Return next tier, if there is one. If this is an instance, then the next tier is the documentation for the class. If it is a class, then the next tier is the documentation for the superclass.

Returns:

The next tier, or null if there isn't one.

getPortDoc

public java.lang.String getPortDoc(java.lang.String name)

Return the documentation for the specified port, or null if there is none.

Parameters:

name - The name of the port.

Returns:

The documentation for the specified port, or null if there is none.

getPropertyDoc

public java.lang.String getPropertyDoc(java.lang.String name)

Return the documentation for the specified property (parameter or attribute), or null if there is none.

Parameters:

name - The name of the property.

Returns:

The documentation for the specified property, or null if there is none.

getProposedRating

public java.lang.String getProposedRating()

Return the Pt.ProposedRating field, or null if none has been given. Note that unlike some of the other fields, this does not delegate to the next tier if no since field has been given.

Returns:

The Pt.ProposedRating field.

getSince

public java.lang.String getSince()

Return the since field, or null if none has been given. Note that unlike some of the other fields, this does not delegate to the next tier if no since field has been given.

Returns:

The since field.

getRemoteDocumentationURLBase

public static java.lang.String getRemoteDocumentationURLBase()

Get the location of the website documentation. The website documentation is set by the _remoteDocumentationURLBase attribute in the configuration. That attribute, if present, should be a parameter that whose value is a string that represents the URL where the documentation may be found. If the _remoteDocumentationURLBase attribute is not set, then the location of the website documentation defaults to http://ptolemy.eecs.berkeley.edu/ptolemyII/ptII/Major.Version, where Major.Version is the value returned by VersionAttribute.majorCurrentVersion().

Returns:

The URL location of the website documentation.

See Also:

setRemoteDocumentationURLBase(String)

getTargetClass

public java.lang.Class getTargetClass()

Return the class of the target.

Returns:

The class of the target.

getVersion

public java.lang.String getVersion()

Return the version field, or null if none has been given. Note that unlike some of the other fields, this does not delegate to the next tier if no version has been given. If the version field is the standard CVS version, then return only the version number and date.

Returns:

The version field.

getSeeAlso

public java.lang.String getSeeAlso()

Return "see also" information. This includes a link to the javadoc documentation, the source code, and the superclass information.

Returns:

The "see also" information.

hadException

public boolean hadException()

Return true if an exception was encountered parsing the DocML data.

Returns:

True if an exception was encountered.

isInstanceDoc

public boolean isInstanceDoc()

Return true if the primary source of documentation is the instance. That is, return true if the target has an instance of DocAttribute in it, and at least one of the fields of the DocAttribute is not empty.

Returns:

True if this documents an instance (vs. a class).

isTargetInstantiableAttribute

public boolean isTargetInstantiableAttribute()

Return true if the target class is a subclass of Attribute that has a two-argument constructor compatible where the first argument is a CompositeEntity and the second is a String. This will return true if the target is itself an instance of Attribute or a subclass.

Returns:

True if the target is an instantiable attribute.

isTargetInstantiableEntity

public boolean isTargetInstantiableEntity()

Return true if the target class is a subclass of Entity that has a two-argument constructor compatible where the first argument is a CompositeEntity and the second is a String. This will return true if the target is itself an instance of Entity or a subclass.

Returns:

True if the target is an instantiable entity.

isTargetInstantiablePort

public boolean isTargetInstantiablePort()

Return true if the target class is a subclass of Port that has a two-argument constructor compatible where the first argument is a CompositeEntity and the second is a String. This will return true if the target is itself an instance of Port or a subclass.

Returns:

True if the target is an instantiable port.

parse

public void parse(java.net.URL base,
                  java.io.InputStream input)
           throws java.lang.Exception

Parse the given stream as a DocML file. For example, a user might use this method as follows:

     DocManager parser = new DocManager();
     URL xmlFile = new URL(null, docURL);
     parser.parse(xmlFile.openStream());
  

A variety of exceptions might be thrown if the parsed data does not represent a valid DocML file.

Parameters:

base - The base URL from which the XML is read.

input - The stream from which to read XML.

Throws:

java.lang.Exception - If the parser fails.

parse

public void parse(java.net.URL base,
                  java.io.Reader reader)
           throws java.lang.Exception

Parse the given stream as a DocML file. A variety of exceptions might be thrown if the parsed data does not represent a valid DocML file.

Parameters:

base - The base URL from which the XML is read.

reader - The stream from which to read XML.

Throws:

java.lang.Exception - If the parser fails.

parse

public void parse(java.lang.String text)
           throws java.lang.Exception

Parse the given text as DocML. A variety of exceptions might be thrown if the parsed data does not represent valid DocML data.

Parameters:

text - The DocML data.

Throws:

java.lang.Exception - If the parser fails.

resolveEntity

public java.lang.Object resolveEntity(java.lang.String publicID,
                                      java.lang.String systemID)

Resolve an external entity. If the first argument is the name of the DocML PUBLIC DTD ("-//UC Berkeley//DTD DocML 1//EN"), then return a StringReader that will read the locally cached version of this DTD (the public variable DocML_DTD_1). Otherwise, return null, which has the effect of deferring to Ælfred for resolution of the URI. Derived classes may return a a modified URI (a string), an InputStream, or a Reader. In the latter two cases, the input character stream is provided.

Specified by:

resolveEntity in interface XmlHandler

Overrides:

resolveEntity in class HandlerBase

Parameters:

publicID - The public identifier, or null if none was supplied.

systemID - The system identifier.

Returns:

Null, indicating to use the default system identifier.

See Also:

XmlHandler.resolveEntity(java.lang.String, java.lang.String)

setRemoteDocumentationURLBase

public static void setRemoteDocumentationURLBase(java.lang.String remoteDocumentationURLBase)

Set the location of the remote documentation.

Parameters:

remoteDocumentationURLBase - The remote location of the class documentation.

See Also:

getRemoteDocumentationURLBase()

startDocument

public void startDocument()

Start a document. This method is called just before the parser attempts to read the first entity (the root of the document). It is guaranteed that this will be the first method called.

Specified by:

startDocument in interface XmlHandler

Overrides:

startDocument in class HandlerBase

See Also:

XmlHandler.startDocument()

startElement

public void startElement(java.lang.String elementName)
                  throws XmlException

Start an element. This is called at the beginning of each XML element. By the time it is called, all of the attributes for the element will already have been reported using the attribute() method. Unrecognized elements are ignored.

Specified by:

startElement in interface XmlHandler

Overrides:

startElement in class HandlerBase

Parameters:

elementName - The element type name.

Throws:

XmlException - If the element produces an error in constructing the model.

See Also:

XmlHandler.startElement(java.lang.String)

startExternalEntity

public void startExternalEntity(java.lang.String systemID)

Handle the start of an external entity. This pushes the stack so that error reporting correctly reports the external entity that causes the error.

Specified by:

startExternalEntity in interface XmlHandler

Overrides:

startExternalEntity in class HandlerBase

Parameters:

systemID - The URI for the external entity.

See Also:

XmlHandler.startExternalEntity(java.lang.String)

_checkForNull

protected void _checkForNull(java.lang.Object object,
                             java.lang.String message)
                      throws XmlException

If the argument is null, throw an exception with the given message.

Parameters:

object - The reference to check for null.

message - The message to issue if the reference is null.

Throws:

XmlException - If the object parameter is null.

_currentExternalEntity

protected java.lang.String _currentExternalEntity()

Get the the URI for the current external entity.

Returns:

A string giving the URI of the external entity being read, or null if none.