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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/*
* The contents of this file are subject to the terms of the Common Development
* and Distribution License (the License). You may not use this file except in
* compliance with the License.
*
* You can obtain a copy of the License at http://www.sun.com/cddl/cddl.html
* or http://www.netbeans.org/cddl.txt.
*
* When distributing Covered Code, include this CDDL Header Notice in each file
* and include the License file at http://www.netbeans.org/cddl.txt.
* If applicable, add the following below the CDDL Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyrighted [year] [name of copyright owner]"
*
* The Original Software is SezPoz. The Initial Developer of the Original
* Software is Sun Microsystems, Inc. Portions Copyright 2008 Sun
* Microsystems, Inc. All Rights Reserved.
*/package org.jvnet.hudson.annotation_indexer;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.URL;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* @author Kohsuke Kawaguchi
*/
public class Index {
/**
* Lists up all the elements annotated by the given annotation and of the given {@link AnnotatedElement} subtype.
*/
public static <T extends AnnotatedElement> Iterable<T> list(Class<? extends Annotation> type, ClassLoader cl, final Class<T> subType) throws IOException {
final Iterable<AnnotatedElement> base = list(type,cl);
return new Iterable<T>() {
public Iterator<T> iterator() {
return new FilterIterator(base.iterator()) {
protected boolean filter(Object o) {
return subType.isInstance(o);
}
};
}
};
}
/**
* Lists up all the elements annotated by the given annotation.
*/
public static Iterable<AnnotatedElement> list(final Class<? extends Annotation> type, final ClassLoader cl) throws IOException {
if (!type.isAnnotationPresent(Indexed.class))
throw new IllegalArgumentException(type+" doesn't have @Indexed");
final Set<String> ids = new TreeSet<String>();
final Enumeration<URL> res = cl.getResources("META-INF/annotations/"+type.getName());
while (res.hasMoreElements()) {
URL url = res.nextElement();
BufferedReader r = new BufferedReader(new InputStreamReader(url.openStream(), "UTF-8"));
String line;
while ((line=r.readLine())!=null)
ids.add(line);
}
return new Iterable<AnnotatedElement>() {
public Iterator<AnnotatedElement> iterator() {
return new Iterator<AnnotatedElement>() {
/**
* Next element to return.
*/
private AnnotatedElement next;
private Iterator<String> iditr = ids.iterator();
private List<AnnotatedElement> lookaheads = new LinkedList<AnnotatedElement>();
public boolean hasNext() {
fetch();
return next!=null;
}
public AnnotatedElement next() {
fetch();
AnnotatedElement r = next;
next = null;
return r;
}
public void remove() {
throw new UnsupportedOperationException();
}
private void fetch() {
while (next==null) {
if (!lookaheads.isEmpty()) {
next = lookaheads.remove(0);
return;
}
if (!iditr.hasNext()) return;
String name = iditr.next();
try {
Class<?> c = cl.loadClass(name);
if (c.isAnnotationPresent(type))
lookaheads.add(c);
listAnnotatedElements(c.getDeclaredMethods());
listAnnotatedElements(c.getDeclaredFields());
} catch (ClassNotFoundException e) {
LOGGER.log(Level.FINE, "Failed to load: "+name,e);
}
}
}
private void listAnnotatedElements(AnnotatedElement[] elements) {
for (AnnotatedElement m : elements) {
// this means we don't correctly handle
if (m.isAnnotationPresent(type))
lookaheads.add(m);
}
}
};
}
};
}
private static final Logger LOGGER = Logger.getLogger(Index.class.getName());
}
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