org.glassfish.jersey.server.internal.scanning.FileSchemeResourceFinderFactory 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, 2018 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.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.net.URI;
import java.util.Collections;
import java.util.NoSuchElementException;
import java.util.Set;
import java.util.Stack;

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

/**
 * A "file" scheme URI scanner that recursively scans directories.
 * Files are reported to a {@link ResourceProcessor}.
 *
 * @author Paul Sandoz
 */
final class FileSchemeResourceFinderFactory implements UriSchemeResourceFinderFactory {

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

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

    /**
     * Create new "file" scheme URI scanner factory.
     */
    FileSchemeResourceFinderFactory() {
    }

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

    private class FileSchemeScanner extends AbstractResourceFinderAdapter {

        private final CompositeResourceFinder compositeResourceFinder;
        private final boolean recursive;

        private FileSchemeScanner(final URI uri, final boolean recursive) {
            this.compositeResourceFinder = new CompositeResourceFinder();
            this.recursive = recursive;

            processFile(new File(uri.getPath()));
        }

        @Override
        public boolean hasNext() {
            return compositeResourceFinder.hasNext();
        }

        @Override
        public String next() {
            return compositeResourceFinder.next();
        }

        @Override
        public InputStream open() {
            return compositeResourceFinder.open();
        }

        @Override
        public void close() {
            compositeResourceFinder.close();
        }

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

        private void processFile(final File f) {
            compositeResourceFinder.push(new AbstractResourceFinderAdapter() {

                Stack files = new Stack() {{
                    if (f.isDirectory()) {
                        final File[] subDirFiles = f.listFiles();
                        if (subDirFiles != null) {
                            for (final File file : subDirFiles) {
                                push(file);
                            }
                        }
                    } else {
                        push(f);
                    }
                }};

                private File current;
                private File next;

                @Override
                public boolean hasNext() {
                    while (next == null && !files.empty()) {
                        next = files.pop();

                        if (next.isDirectory()) {
                            if (recursive) {
                                processFile(next);
                            }
                            next = null;
                        }
                    }

                    return next != null;
                }

                @Override
                public String next() {
                    if (next != null || hasNext()) {
                        current = next;
                        next = null;
                        return current.getName();
                    }

                    throw new NoSuchElementException();
                }

                @Override
                public InputStream open() {
                    try {
                        return new FileInputStream(current);
                    } catch (final FileNotFoundException e) {
                        throw new ResourceFinderException(e);
                    }
                }

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