Compatibility Note: Methods may be added to this interface * in future releases of the platform. * * @author Joseph D. Darcy * @author Scott Seligman * @author Peter von der Ahé * @see javax.annotation.processing.ProcessingEnvironment#getElementUtils * @since 1.6 */ public interface Elements { /** * Returns a package given its fully qualified name. * * @param name fully qualified package name, or "" for an unnamed package * @return the named package, or {@code null} if it cannot be found */ PackageElement getPackageElement(CharSequence name); /** * Returns a type element given its canonical name. * * @param name the canonical name * @return the named type element, or {@code null} if it cannot be found */ TypeElement getTypeElement(CharSequence name); /** * Returns the values of an annotation's elements, including defaults. * * @see AnnotationMirror#getElementValues() * @param a annotation to examine * @return the values of the annotation's elements, including defaults */ Map getElementValuesWithDefaults(AnnotationMirror a); /** * Returns the text of the documentation ("Javadoc") * comment of an element. * *
A documentation comment of an element is a comment that
* begins with "{@code /**}" , ends with a separate
* "*/", and immediately precedes the element,
* ignoring white space. Therefore, a documentation comment
* contains at least three"{@code *}" characters. The text
* returned for the documentation comment is a processed form of
* the comment as it appears in source code. The leading "{@code
* /**}" and trailing "*/" are removed. For lines
* of the comment starting after the initial "{@code /**}",
* leading white space characters are discarded as are any
* consecutive "{@code *}" characters appearing after the white
* space or starting the line. The processed lines are then
* concatenated together (including line terminators) and
* returned.
*
* @param e the element being examined
* @return the documentation comment of the element, or {@code null}
* if there is none
* @jls 3.6 White Space
*/
String getDocComment(Element e);
/**
* Returns {@code true} if the element is deprecated, {@code false} otherwise.
*
* @param e the element being examined
* @return {@code true} if the element is deprecated, {@code false} otherwise
*/
boolean isDeprecated(Element e);
/**
* Returns the binary name of a type element.
*
* @param type the type element being examined
* @return the binary name
*
* @see TypeElement#getQualifiedName
* @jls 13.1 The Form of a Binary
*/
Name getBinaryName(TypeElement type);
/**
* Returns the package of an element. The package of a package is
* itself.
*
* @param type the element being examined
* @return the package of an element
*/
PackageElement getPackageOf(Element type);
/**
* Returns all members of a type element, whether inherited or
* declared directly. For a class the result also includes its
* constructors, but not local or anonymous classes.
*
*
Note that elements of certain kinds can be isolated using * methods in {@link ElementFilter}. * * @param type the type being examined * @return all members of the type * @see Element#getEnclosedElements */ List getAllMembers(TypeElement type); /** * Returns all annotations of an element, whether * inherited or directly present. * * @param e the element being examined * @return all annotations of the element * @see Element#getAnnotationMirrors */ List getAllAnnotationMirrors(Element e); /** * Tests whether one type, method, or field hides another. * * @param hider the first element * @param hidden the second element * @return {@code true} if and only if the first element hides * the second */ boolean hides(Element hider, Element hidden); /** * Tests whether one method, as a member of a given type, * overrides another method. * When a non-abstract method overrides an abstract one, the * former is also said to implement the latter. * *
In the simplest and most typical usage, the value of the * {@code type} parameter will simply be the class or interface * directly enclosing {@code overrider} (the possibly-overriding * method). For example, suppose {@code m1} represents the method * {@code String.hashCode} and {@code m2} represents {@code * Object.hashCode}. We can then ask whether {@code m1} overrides * {@code m2} within the class {@code String} (it does): * *
* {@code assert elements.overrides(m1, m2, * elements.getTypeElement("java.lang.String")); } ** * A more interesting case can be illustrated by the following example * in which a method in type {@code A} does not override a * like-named method in type {@code B}: * *
* {@code class A { public void m() {} } }* * When viewed as a member of a third type {@code C}, however, * the method in {@code A} does override the one in {@code B}: * *
* {@code interface B { void m(); } }
* ...
* {@code m1 = ...; // A.m }
* {@code m2 = ...; // B.m }
* {@code assert ! elements.overrides(m1, m2, * elements.getTypeElement("A")); } *
* {@code class C extends A implements B {} }* * @param overrider the first method, possible overrider * @param overridden the second method, possibly being overridden * @param type the type of which the first method is a member * @return {@code true} if and only if the first method overrides * the second * @jls 8.4.8 Inheritance, Overriding, and Hiding * @jls 9.4.1 Inheritance and Overriding */ boolean overrides(ExecutableElement overrider, ExecutableElement overridden, TypeElement type); /** * Returns the text of a constant expression representing a * primitive value or a string. * The text returned is in a form suitable for representing the value * in source code. * * @param value a primitive value or string * @return the text of a constant expression * @throws IllegalArgumentException if the argument is not a primitive * value or string * * @see VariableElement#getConstantValue() */ String getConstantExpression(Object value); /** * Prints a representation of the elements to the given writer in * the specified order. The main purpose of this method is for * diagnostics. The exact format of the output is not * specified and is subject to change. * * @param w the writer to print the output to * @param elements the elements to print */ void printElements(java.io.Writer w, Element... elements); /** * Return a name with the same sequence of characters as the * argument. * * @param cs the character sequence to return as a name */ Name getName(CharSequence cs); }
* ...
* {@code assert elements.overrides(m1, m2, * elements.getTypeElement("C")); } *