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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.
/*
* #%L
* SciJava Common shared library for SciJava software.
* %%
* Copyright (C) 2009 - 2016 Board of Regents of the University of
* Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
* Institute of Molecular Cell Biology and Genetics.
* %%
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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package org.scijava.annotations;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.TreeMap;
import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.Filer;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;
import javax.annotation.processing.SupportedSourceVersion;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.Name;
import javax.lang.model.element.TypeElement;
import javax.lang.model.element.VariableElement;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.Elements;
import javax.lang.model.util.Types;
import javax.tools.Diagnostic.Kind;
import javax.tools.FileObject;
import javax.tools.StandardLocation;
import org.scijava.annotations.AbstractIndexWriter.StreamFactory;
/**
* The annotation processor for use with Java 6 and above.
*
* @author Johannes Schindelin
*/
@SupportedSourceVersion(SourceVersion.RELEASE_6)
@SupportedAnnotationTypes("*")
public class AnnotationProcessor extends AbstractProcessor {
private RoundEnvironment roundEnv;
@Override
public boolean process(final Set extends TypeElement> elements,
final RoundEnvironment env)
{
roundEnv = env;
final Writer writer = new Writer();
for (final TypeElement element : elements) {
writer.add(element);
}
try {
writer.write(writer);
}
catch (final IOException e) {
final ByteArrayOutputStream out = new ByteArrayOutputStream();
e.printStackTrace(new PrintStream(out));
try {
out.close();
processingEnv.getMessager().printMessage(Kind.ERROR, out.toString());
}
catch (final IOException e2) {
processingEnv.getMessager().printMessage(Kind.ERROR,
e2.getMessage() + " while printing " + e.getMessage());
}
}
return false;
}
private class Writer extends AbstractIndexWriter implements StreamFactory {
private final Map> originatingElements =
new HashMap<>();
private final Filer filer = processingEnv.getFiler();
private final Elements utils = processingEnv.getElementUtils();
private final Types typeUtils = processingEnv.getTypeUtils();
public void add(final TypeElement element) {
final AnnotationMirror mirror = getMirror(element);
if (mirror != null) {
final String annotationName = utils.getBinaryName(element).toString();
// remember originating elements
List originating = originatingElements.get(annotationName);
if (originating == null) {
originating = new ArrayList<>();
originatingElements.put(annotationName, originating);
}
for (final Element annotated : roundEnv
.getElementsAnnotatedWith(element))
{
switch (annotated.getKind()) {
case ANNOTATION_TYPE:
case CLASS:
case ENUM:
case INTERFACE:
final String className =
utils.getBinaryName((TypeElement) annotated).toString();
final Map values =
adapt(annotated.getAnnotationMirrors(), element.asType());
super.add(values, annotationName, className);
originating.add(annotated);
break;
default:
processingEnv.getMessager().printMessage(
Kind.ERROR,
"Cannot handle annotated element of kind " +
annotated.getKind());
}
}
}
//
}
@SuppressWarnings("unchecked")
private Map adapt(
final List extends AnnotationMirror> mirrors,
final TypeMirror annotationType)
{
final Map result = new TreeMap<>();
for (final AnnotationMirror mirror : mirrors) {
if (typeUtils.isSameType(mirror.getAnnotationType(), annotationType)) {
return (Map) adapt(mirror);
}
}
return result;
}
@Override
protected Object adapt(final Object o) {
if (o instanceof AnnotationMirror) {
final AnnotationMirror mirror = (AnnotationMirror) o;
final Map result = new TreeMap<>();
for (final Entry extends ExecutableElement, ? extends AnnotationValue> entry : mirror
.getElementValues().entrySet())
{
final String key = entry.getKey().getSimpleName().toString();
final Object value = adapt(entry.getValue().getValue());
result.put(key, value);
}
return result;
}
else if (o instanceof List) {
final List> list = (List>) o;
final List