com.redhat.ceylon.langtools.tools.javac.processing.JavacRoundEnvironment Maven / Gradle / Ivy
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package com.redhat.ceylon.langtools.tools.javac.processing;
import java.lang.annotation.Annotation;
import com.redhat.ceylon.javax.annotation.processing.*;
import com.redhat.ceylon.javax.lang.model.element.*;
import com.redhat.ceylon.javax.lang.model.type.DeclaredType;
import com.redhat.ceylon.javax.lang.model.type.TypeMirror;
import com.redhat.ceylon.javax.lang.model.util.*;
import com.redhat.ceylon.langtools.tools.javac.tree.JCTree.*;
import java.util.*;
import com.redhat.ceylon.javax.annotation.processing.ProcessingEnvironment;
import com.redhat.ceylon.javax.annotation.processing.RoundEnvironment;
import com.redhat.ceylon.javax.lang.model.element.AnnotationMirror;
import com.redhat.ceylon.javax.lang.model.element.Element;
import com.redhat.ceylon.javax.lang.model.element.ElementKind;
import com.redhat.ceylon.javax.lang.model.element.TypeElement;
import com.redhat.ceylon.javax.lang.model.util.ElementScanner7;
import com.redhat.ceylon.javax.lang.model.util.Types;
/**
* Object providing state about a prior round of annotation processing.
*
* The methods in this class do not take type annotations into account,
* as target types, not java elements.
*
*
This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.
*/
public class JavacRoundEnvironment implements RoundEnvironment {
// Default equals and hashCode methods are okay.
private final boolean processingOver;
private final boolean errorRaised;
private final ProcessingEnvironment processingEnv;
// Caller must pass in an immutable set
private final Set rootElements;
JavacRoundEnvironment(boolean processingOver,
boolean errorRaised,
Set rootElements,
ProcessingEnvironment processingEnv) {
this.processingOver = processingOver;
this.errorRaised = errorRaised;
this.rootElements = rootElements;
this.processingEnv = processingEnv;
}
public String toString() {
return String.format("[errorRaised=%b, rootElements=%s, processingOver=%b]",
errorRaised,
rootElements,
processingOver);
}
public boolean processingOver() {
return processingOver;
}
/**
* Returns {@code true} if an error was raised in the prior round
* of processing; returns {@code false} otherwise.
*
* @return {@code true} if an error was raised in the prior round
* of processing; returns {@code false} otherwise.
*/
public boolean errorRaised() {
return errorRaised;
}
/**
* Returns the type elements specified by the prior round.
*
* @return the types elements specified by the prior round, or an
* empty set if there were none
*/
public Set getRootElements() {
return rootElements;
}
private static final String NOT_AN_ANNOTATION_TYPE =
"The argument does not represent an annotation type: ";
/**
* Returns the elements annotated with the given annotation type.
* Only type elements included in this round of annotation
* processing, or declarations of members, parameters, or type
* parameters declared within those, are returned. Included type
* elements are {@linkplain #getSpecifiedTypeElements specified
* types} and any types nested within them.
*
* @param a annotation type being requested
* @return the elements annotated with the given annotation type,
* or an empty set if there are none
*/
public Set getElementsAnnotatedWith(TypeElement a) {
Set result = Collections.emptySet();
Types typeUtil = processingEnv.getTypeUtils();
if (a.getKind() != ElementKind.ANNOTATION_TYPE)
throw new IllegalArgumentException(NOT_AN_ANNOTATION_TYPE + a);
DeclaredType annotationTypeElement;
TypeMirror tm = a.asType();
if ( tm instanceof DeclaredType )
annotationTypeElement = (DeclaredType) a.asType();
else
throw new AssertionError("Bad implementation type for " + tm);
ElementScanner7, DeclaredType> scanner =
new AnnotationSetScanner(result, typeUtil);
for (Element element : rootElements)
result = scanner.scan(element, annotationTypeElement);
return result;
}
// Could be written as a local class inside getElementsAnnotatedWith
private class AnnotationSetScanner extends
ElementScanner7, DeclaredType> {
// Insertion-order preserving set
Set annotatedElements = new LinkedHashSet();
Types typeUtil;
AnnotationSetScanner(Set defaultSet, Types typeUtil) {
super(defaultSet);
this.typeUtil = typeUtil;
}
@Override
public Set scan(Element e, DeclaredType p) {
java.util.List annotationMirrors =
processingEnv.getElementUtils().getAllAnnotationMirrors(e);
for (AnnotationMirror annotationMirror : annotationMirrors) {
if (typeUtil.isSameType(annotationMirror.getAnnotationType(), p))
annotatedElements.add(e);
}
e.accept(this, p);
return annotatedElements;
}
}
/**
* {@inheritdoc}
*/
public Set getElementsAnnotatedWith(Class a) {
if (!a.isAnnotation())
throw new IllegalArgumentException(NOT_AN_ANNOTATION_TYPE + a);
String name = a.getCanonicalName();
if (name == null)
return Collections.emptySet();
else {
TypeElement annotationType = processingEnv.getElementUtils().getTypeElement(name);
if (annotationType == null)
return Collections.emptySet();
else
return getElementsAnnotatedWith(annotationType);
}
}
}