org.glassfish.jersey.server.internal.scanning.BundleSchemeResourceFinderFactory 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.IOException;
import java.io.InputStream;
import java.net.URI;
import java.util.Collections;
import java.util.NoSuchElementException;
import java.util.Set;

import org.glassfish.jersey.server.internal.AbstractResourceFinderAdapter;

/**
 * Preparations for OSGi support.
 *
 * @author Jakub Podlesak
 */
final class BundleSchemeResourceFinderFactory implements UriSchemeResourceFinderFactory {

    private static final Set SCHEMES = Collections.singleton("bundle");

    @Override
    public Set getSchemes() {
        return SCHEMES;
    }

    /**
     * Create new bundle scheme resource finder factory.
     */
    BundleSchemeResourceFinderFactory() {
    }

    @Override
    public BundleSchemeScanner create(final URI uri, final boolean recursive) {
        return new BundleSchemeScanner(uri);
    }

    private class BundleSchemeScanner extends AbstractResourceFinderAdapter {

        private BundleSchemeScanner(final URI uri) {
            this.uri = uri;
        }

        private final URI uri;

        /**
         * Marks this iterator as iterated after execution of {@link #open()} method.
         * Together with {@link #iterated}, this field determines a returned value of {@link #hasNext()}.
         */
        private boolean accessed = false;

        /**
         * Marks this iterator as iterated after execution of {@link #next()} method.
         * Together with {@link #accessed}, this field determines a returned value of {@link #hasNext()}.
         */
        private boolean iterated = false;

        @Override
        public boolean hasNext() {
            return !accessed && !iterated;
        }

        @Override
        public String next() {
            if (hasNext()) {
                iterated = true;
                return uri.getPath();
            }

            throw new NoSuchElementException();
        }

        @Override
        public InputStream open() {
            if (!accessed) {
                try {
                    accessed = true;
                    return uri.toURL().openStream();
                } catch (final IOException e) {
                    throw new ResourceFinderException(e);
                }
            }

            return null;
        }

        @Override
        public void reset() {
            throw new UnsupportedOperationException();
        }
    }

}