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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 - 2017 Board of Regents of the University of
* Wisconsin-Madison, Broad Institute of MIT and Harvard, Max Planck
* Institute of Molecular Cell Biology and Genetics, University of
* Konstanz, and KNIME GmbH.
* %%
* 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
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
* #L%
*/
package org.scijava.annotations;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Map;
/**
* Indexes a directory of classes.
*
* The assumption is that the classes are tested at some stage before packaging.
* That will be the time when we can index the annotations, even if Eclipse
* decided not to run any annotation processor.
*
*
* @author Johannes Schindelin
*/
public class DirectoryIndexer extends AbstractIndexWriter {
public void index(final File directory) throws IOException {
try {
@SuppressWarnings("deprecation")
final URLClassLoader loader =
new URLClassLoader(new URL[] { directory.toURL() }, Thread
.currentThread().getContextClassLoader());
discoverAnnotations(directory, "", loader);
}
catch (MalformedURLException e) {
throw new IOException(e);
}
write(directory);
}
protected void discoverAnnotations(final File directory,
final String classNamePrefix, final ClassLoader loader) throws IOException
{
final File[] list = directory.listFiles();
if (list == null) {
return;
}
for (final File file : list) {
if (file.isDirectory()) {
discoverAnnotations(file, classNamePrefix + file.getName() + ".",
loader);
}
else if (file.isFile()) {
final String fileName = file.getName();
if (!fileName.endsWith(".class")) {
continue;
}
final String className =
classNamePrefix + fileName.substring(0, fileName.length() - 6);
try {
for (final Map.Entry> entry : ByteCodeAnalyzer
.getAnnotations(file).entrySet())
{
final String annotationName = entry.getKey();
try {
if (!isIndexable(loader.loadClass(annotationName))) {
continue;
}
}
catch (ClassNotFoundException e) {
// fall back to the class loader that laoded the directory indexer
if (!isIndexable(Class.forName(annotationName))) {
continue;
}
}
add(entry.getValue(), annotationName, className);
}
}
catch (Throwable e) {
System.err.println("Warning: could not load class '" + className +
"'; skipping");
e.printStackTrace();
}
}
}
}
protected synchronized void add(final A annotation,
final String className)
{
if (!isIndexable(annotation)) {
return;
}
add(adapt(annotation), annotation.annotationType().getName(), className);
}
private static boolean isIndexable(final A annotation)
{
return isIndexable(annotation.annotationType());
}
private static boolean isIndexable(final Class annotationClass) {
return annotationClass.getAnnotation(Indexable.class) != null;
}
protected synchronized void write(final File directory) throws IOException {
final StreamFactory factory = new StreamFactory() {
@Override
public InputStream openInput(String annotationName) throws IOException {
final File file =
new File(directory, Index.INDEX_PREFIX + annotationName);
if (file.exists()) {
return new FileInputStream(file);
}
return null;
}
@Override
public OutputStream openOutput(String annotationName) throws IOException {
final File file =
new File(directory, Index.INDEX_PREFIX + annotationName);
final File dir = file.getParentFile();
if (dir != null && !dir.isDirectory() && !dir.mkdirs()) {
throw new IOException("Could not make directory " + dir);
}
return new FileOutputStream(file) {
@Override
public void close() throws IOException {
super.close();
if (file.length() == 0) {
file.delete();
}
}
};
}
@Override
public boolean isClassObsolete(String className) {
final String classPath = className.replace('.', '/') + ".class";
return !new File(directory, classPath).exists();
}
};
final File[] possiblyObsoletes =
new File(directory, Index.INDEX_PREFIX).listFiles();
if (possiblyObsoletes != null) {
for (final File candidate : possiblyObsoletes) {
if (candidate.isFile()) {
final String annotationName = candidate.getName();
merge(annotationName, factory);
}
}
}
write(factory);
}
}