org.glassfish.jersey.server.internal.scanning.CompositeResourceFinder Maven / Gradle / Ivy

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A bundle project producing JAX-RS RI bundles. The primary artifact is an "all-in-one" OSGi-fied JAX-RS RI bundle (jaxrs-ri.jar). Attached to that are two compressed JAX-RS RI archives. The first archive (jaxrs-ri.zip) consists of binary RI bits and contains the API jar (under "api" directory), RI libraries (under "lib" directory) as well as all external RI dependencies (under "ext" directory). The secondary archive (jaxrs-ri-src.zip) contains buildable JAX-RS RI source bundle and contains the API jar (under "api" directory), RI sources (under "src" directory) as well as all external RI dependencies (under "ext" directory). The second archive also contains "build.xml" ANT script that builds the RI sources. To build the JAX-RS RI simply unzip the archive, cd to the created jaxrs-ri directory and invoke "ant" from the command line.

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/*
 * 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);
    }
}