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Jersey core server implementation
/*
* Copyright (c) 2012, 2019 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.jersey.server.internal.scanning;
import java.io.InputStream;
import java.util.Deque;
import java.util.LinkedList;
import java.util.NoSuchElementException;
import java.util.Stack;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.glassfish.jersey.server.ResourceFinder;
import org.glassfish.jersey.server.internal.AbstractResourceFinderAdapter;
import org.glassfish.jersey.server.internal.LocalizationMessages;
/**
* {@link Stack} of {@link ResourceFinder} instances.
*
* Used to combine various finders into one instance.
*
* @author Pavel Bucek
*/
public final class CompositeResourceFinder extends AbstractResourceFinderAdapter {
private static final Logger LOGGER = Logger.getLogger(CompositeResourceFinder.class.getName());
private final Deque stack = new LinkedList<>();
private ResourceFinder current = null;
@Override
public boolean hasNext() {
if (current == null) {
if (!stack.isEmpty()) {
current = stack.pop();
} else {
return false;
}
}
if (current.hasNext()) {
return true;
} else {
if (!stack.isEmpty()) {
current = stack.pop();
return hasNext();
} else {
return false;
}
}
}
@Override
public String next() {
if (hasNext()) {
return current.next();
}
throw new NoSuchElementException();
}
@Override
public InputStream open() {
return current.open();
}
@Override
public void close() {
if (current != null) {
// Insert the currently processed resource finder at the top of the stack.
stack.addFirst(current);
current = null;
}
for (final ResourceFinder finder : stack) {
try {
finder.close();
} catch (final RuntimeException e) {
LOGGER.log(Level.CONFIG, LocalizationMessages.ERROR_CLOSING_FINDER(finder.getClass()), e);
}
}
stack.clear();
}
@Override
public void reset() {
throw new UnsupportedOperationException();
}
public void push(final ResourceFinder iterator) {
stack.push(iterator);
}
}