org.exolab.javasource

Class JAnnotation

public final class JAnnotation extends Object

JAnnotation represents a single annotation against a code element. The methods described on the JAnnotatedElement interface are used to associate JAnnotation's with various other objects in this package describing Java code elements.

The print method outputs annotations in various forms (as described in the Java Language Specification Third Edition) based on the methods called.

For "Marker Annotation", construct with the appropriate JAnnotationType.

   JAnnotationType preliminaryType = new JAnnotationType("Preliminary");
   JAnnotation preliminary = new JAnnotation(preliminaryType);
 
outputs
   @Preliminary()
 
For "Single Element Annotation", construct as above and call the setValue(value) method to set the value of the "value" element of the annotation type.
   JAnnotationType copyrightType = new JAnnotationType("Copyright");
   JAnnotation copyright = new JAnnotation(copyrightType);
   copyright.setValue("\"2002 Yoyodyne Systems, Inc., All rights reserved.\"");
 
outputs
   @Copyright("2002 Yoyodyne Propulsion Systems, Inc., All rights reserved.")
 
For "Normal Annotation," construct as above then call the appropriate setValue methods that accept an "elementName" parameter.
   JAnnotationType requestType = new JAnnotationType("RequestForEnhancement");
   JAnnotation request = new JAnnotation(requestType);
   request.setElementValue("id", "2868724");
   request.setElementValue("synopsis", "\"Provide time-travel functionality\"");
   request.setElementValue("engineer", "\"Mr. Peabody\"");
   request.setElementValue("date", "\"4/1/2004\"");
 
outputs
   @RequestForEnhancement(
       id       = 2868724,
       sysopsis = "Provide time-travel functionality",
       engineer = "Mr. Peabody",
       date     = "4/1/2004")
 
"Complex" annotations are also supported via the various setValue methods that take a JAnnotation object.
   JAnnotationType nameType = new JAnnotationType("Name");
   JAnnotationType authorType = new JAnnotationType("Author");
   JAnnotation author = new JAnnotation(authorType);
   JAnnotation name = new JAnnotation(nameType);
   name.setElementValue("first", "\"Joe\"");
   name.setElementValue("last", "\"Hacker\"");
   author.setValue(name);
 
outputs
   @Author(@Name(
       first = "Joe",
       last  = "Hacker"))
 
Finally annotation elements whose types are arrays are supported via the setValue methods that take arrays:
   JAnnotationType endorsersType = new JAnnotationType("Endorsers");
   JAnnotation endorsers = new JAnnotation(endorsersType);
   endorsers.setValue(new String[] { "\"Children\"", "\"Unscrupulous dentists\""});
 
outputs
   @Endorsers(
       {
           "Children",
           "Unscrupulous dentists"
       })
 
Note: Conditional element values are not currently supported. However the setValue methods taking String values can be used to output this construct literally if desired.

Author: Andrew Fawcett

Field Summary
static StringVALUE
Name of a single element.
Constructor Summary
JAnnotation(JAnnotationType annotationType)
Constructs a JAnnotation for the given annotation type.
Method Summary
JAnnotationTypegetAnnotationType()
Returns the JAnnotationType associated with this JAnnotation.
String[]getElementNames()
Returns the names of the elements set by this annotation.
StringgetElementValue(String elementName)
For the provided element name, returns the annotation element value when it is a String.
JAnnotationgetElementValueAnnotation(String elementName)
For the provided element name, returns the annotation element value when it is a JAnnotation.
JAnnotation[]getElementValueAnnotationList(String elementName)
For the provided element name, returns the annotation element value when it is an array of JAnnotation.
String[]getElementValueList(String elementName)
For the provided element name, returns the annotation element value when it is an array of String.
ObjectgetElementValueObject(String elementName)
Returns the given annotation element value as Object, typically used if the value type is not known.
StringgetValue()
Returns the annotation element value when it is a String.
JAnnotationgetValueAnnotation()
Returns the annotation element value when it is an annotation.
static voidmain(String[] args)
Test.
voidprint(JSourceWriter jsw)
Prints the source code for this JAnnotation to the given JSourceWriter.
voidsetElementValue(String elementName, String stringValue)
Adds an annotation element name=value pair.
voidsetElementValue(String elementName, String[] stringValues)
Adds an annotation element name=list pair.
voidsetElementValue(String elementName, JAnnotation annotationValue)
Adds an annotation element name=annotation pair.
voidsetElementValue(String elementName, JAnnotation[] annotationValues)
Adds an annotation element name=array of annotations.
voidsetValue(String stringValue)
Sets the "value" annotation element value.
voidsetValue(String[] stringValue)
Sets the "value" annotation element value as a list.
voidsetValue(JAnnotation annotationValue)
Sets the "value" annotation element value as an annotation.
voidsetValue(JAnnotation[] annotationValues)
Sets the "value" annotation element value as a list of annotation values.

Field Detail

VALUE

public static final String VALUE
Name of a single element.

Constructor Detail

JAnnotation

public JAnnotation(JAnnotationType annotationType)
Constructs a JAnnotation for the given annotation type.

Parameters: annotationType annotation type

Method Detail

getAnnotationType

public JAnnotationType getAnnotationType()
Returns the JAnnotationType associated with this JAnnotation.

Returns: the JAnnotationType associated with this JAnnotation.

getElementNames

public String[] getElementNames()
Returns the names of the elements set by this annotation.

Returns: array of element names.

getElementValue

public String getElementValue(String elementName)
For the provided element name, returns the annotation element value when it is a String.

Parameters: elementName element to return the value of

Returns: the annotation element value.

getElementValueAnnotation

public JAnnotation getElementValueAnnotation(String elementName)
For the provided element name, returns the annotation element value when it is a JAnnotation.

Parameters: elementName element to return the value of

Returns: the annotation element value.

getElementValueAnnotationList

public JAnnotation[] getElementValueAnnotationList(String elementName)
For the provided element name, returns the annotation element value when it is an array of JAnnotation.

Parameters: elementName element to return the value of

Returns: the annotation element value.

getElementValueList

public String[] getElementValueList(String elementName)
For the provided element name, returns the annotation element value when it is an array of String.

Parameters: elementName element to return the value of

Returns: the annotation element value.

getElementValueObject

public Object getElementValueObject(String elementName)
Returns the given annotation element value as Object, typically used if the value type is not known. This will either be a String or JAnnotation or an array of String or an array of JAnnotation.

Parameters: elementName element to return the value of

Returns: annotation element value as Object

getValue

public String getValue()
Returns the annotation element value when it is a String.

Returns: the annotation element value.

getValueAnnotation

public JAnnotation getValueAnnotation()
Returns the annotation element value when it is an annotation.

Returns: the annotation element value when it is an annotation.

main

public static void main(String[] args)
Test.

Parameters: args command-line arguments.

print

public void print(JSourceWriter jsw)
Prints the source code for this JAnnotation to the given JSourceWriter.

Parameters: jsw the JSourceWriter to print to. Must not be null.

setElementValue

public void setElementValue(String elementName, String stringValue)
Adds an annotation element name=value pair.

Parameters: elementName name of this annotation element stringValue value of this annotation element

setElementValue

public void setElementValue(String elementName, String[] stringValues)
Adds an annotation element name=list pair.

Parameters: elementName name of this annotation element stringValues string array value of this annotation element

setElementValue

public void setElementValue(String elementName, JAnnotation annotationValue)
Adds an annotation element name=annotation pair.

Parameters: elementName name of this annotation element annotationValue annotation to be used as the value

setElementValue

public void setElementValue(String elementName, JAnnotation[] annotationValues)
Adds an annotation element name=array of annotations.

Parameters: elementName name of this annotation element annotationValues array of annotations to be used as the value

setValue

public void setValue(String stringValue)
Sets the "value" annotation element value.

Parameters: stringValue literal String value

setValue

public void setValue(String[] stringValue)
Sets the "value" annotation element value as a list.

Parameters: stringValue Array of literal String values

setValue

public void setValue(JAnnotation annotationValue)
Sets the "value" annotation element value as an annotation.

Parameters: annotationValue JAnnotation to be used as this JAnnotation's value

setValue

public void setValue(JAnnotation[] annotationValues)
Sets the "value" annotation element value as a list of annotation values.

Parameters: annotationValues array of JAnnotations to be used as this JAnnotation's value

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