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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2012-2015 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* http://glassfish.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
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* file and include the License file at packager/legal/LICENSE.txt.
*
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* exception as provided by Oracle in the GPL Version 2 section of the License
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*
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package org.glassfish.jersey.server.internal.scanning;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Method;
import java.net.URI;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.Set;
import org.glassfish.jersey.server.ResourceFinder;
import org.glassfish.jersey.server.internal.AbstractResourceFinderAdapter;
/**
* A JBoss-based "vfsfile", "vfs" and "vfszip" scheme URI scanner.
*
* This approach uses reflection to allow for zero-deps and support
* for both the v2 (EAP5, AS5) and v3 VFS APIs (AS6, AS7, EAP6 & WildFly)
* which are not binary compatible.
*
* @author Jason T. Greene
* @author Paul Sandoz
*/
final class VfsSchemeResourceFinderFactory implements UriSchemeResourceFinderFactory {
private static final Set SCHEMES = Collections
.unmodifiableSet(new HashSet<>(Arrays.asList("vfsfile", "vfszip", "vfs")));
public Set getSchemes() {
return SCHEMES;
}
VfsSchemeResourceFinderFactory() {
}
@Override
public ResourceFinder create(final URI uri, final boolean recursive) {
return new VfsResourceFinder(uri, recursive);
}
private static class VfsResourceFinder extends AbstractResourceFinderAdapter {
private Object current;
private Object next;
private final Method openStream;
private final Method getName;
private final Method isLeaf;
private final Iterator iterator;
public VfsResourceFinder(final URI uri, final boolean recursive) {
final Object directory = bindDirectory(uri);
this.openStream = bindMethod(directory, "openStream");
this.getName = bindMethod(directory, "getName");
this.isLeaf = bindMethod(directory, "isLeaf");
this.iterator = getChildren(directory, recursive);
}
private Iterator getChildren(final Object directory, final boolean recursive) {
final Method getChildren = bindMethod(directory, recursive ? "getChildrenRecursively" : "getChildren");
final List list = invoke(directory, getChildren, List.class);
if (list == null) {
throw new ResourceFinderException("VFS object returned null when accessing children");
}
return list.iterator();
}
private Method bindMethod(final Object object, final String name) {
if (System.getSecurityManager() != null) {
AccessController.doPrivileged(new PrivilegedAction() {
public Method run() {
return bindMethod0(object, name);
}
});
}
return bindMethod0(object, name);
}
private T invoke(final Object instance, final Method method, final Class type) {
try {
return type.cast(method.invoke(instance));
} catch (final Exception e) {
throw new ResourceFinderException("VFS object could not be invoked upon");
}
}
private Method bindMethod0(final Object object, final String name) {
final Class clazz = object.getClass();
try {
return clazz.getMethod(name);
} catch (final NoSuchMethodException e) {
throw new ResourceFinderException("VFS object did not have a valid signature");
}
}
private Object bindDirectory(final URI uri) {
Object directory = null;
try {
directory = uri.toURL().getContent();
} catch (final IOException e) {
// Eat
}
if (directory == null || !directory.getClass().getSimpleName().equals("VirtualFile")) {
throw new ResourceFinderException("VFS URL did not map to a valid VFS object");
}
return directory;
}
@Override
public InputStream open() {
final Object current = this.current;
if (current == null) {
throw new IllegalStateException("next() must be called before open()");
}
return invoke(current, openStream, InputStream.class);
}
@Override
public void reset() {
throw new UnsupportedOperationException();
}
public boolean advance() {
while (iterator.hasNext()) {
final Object next = iterator.next();
if (invoke(next, isLeaf, Boolean.class)) {
this.next = next;
return true;
}
}
return false;
}
@Override
public boolean hasNext() {
return next != null || advance();
}
@Override
public String next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
current = next;
next = null;
return invoke(current, getName, String.class);
}
}
}