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

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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012 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.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * elects to include this software in this distribution under the [CDDL or GPL
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 * recipient has the option to distribute your version of this file under
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package org.glassfish.jersey.server.internal.scanning;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.glassfish.jersey.server.ResourceFinder;
import org.glassfish.jersey.uri.UriComponent;

/**
 * A "jar" and "zip" scheme URI scanner that recursively jar files.
 * Jar entries are reported to a {@link ResourceProcessor}.
 *
 * @author Paul Sandoz
 * @author Gerard Davison ([email protected])
 */
class JarZipSchemeResourceFinderFactory implements UriSchemeResourceFinderFactory {

    @Override
    public Set getSchemes() {
        return new HashSet(Arrays.asList("jar", "zip"));
    }

    /**
     * Create new "jar" and "zip" scheme URI scanner factory.
     */
    JarZipSchemeResourceFinderFactory() {
    }

    @Override
    public JarZipSchemeScanner create(final URI uri, boolean recursive) {
        final String ssp = uri.getRawSchemeSpecificPart();
        final String jarUrlString = ssp.substring(0, ssp.lastIndexOf('!'));
        final String parent = ssp.substring(ssp.lastIndexOf('!') + 2);

        try {
            return new JarZipSchemeScanner(getInputStream(jarUrlString), parent, recursive);
        } catch (IOException e) {
            throw new ResourceFinderException(e);
        }
    }

    private class JarZipSchemeScanner implements ResourceFinder {

        private InputStream inputStream;
        private JarFileScanner jarFileScanner;

        private JarZipSchemeScanner(InputStream inputStream, String parent, boolean recursive) throws IOException {
            this.inputStream = inputStream;
            this.jarFileScanner = new JarFileScanner(inputStream, parent, recursive);
        }

        @Override
        public boolean hasNext() {
            final boolean hasNext = jarFileScanner.hasNext();
            if(!hasNext) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    Logger.getLogger(JarZipSchemeScanner.class.getName()).log(Level.FINE, "Unable to close jar file.", e);
                }
                return false;
            }

            return true;
        }

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

        @Override
        public void remove() {
            jarFileScanner.remove();
        }

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

        @Override
        public void reset() {
            jarFileScanner.reset();
        }
    }

    /**
     * Obtain a {@link InputStream} of the jar file.
     * 
     * For most platforms the format for the zip or jar follows the form of
     * the 

     * 
     *   jar:file:///tmp/fishfingers.zip!/example.txt
     *   zip:http://www.example.com/fishfingers.zip!/example.txt
     * 
     * 
     * On versions of the WebLogic application server a proprietary format is
     * supported of the following form, which assumes a zip file located on
     * the local file system:
     * 
     * 
     *   zip:/tmp/fishfingers.zip!/example.txt
     *   zip:d:/tempfishfingers.zip!/example.txt
     * 
     * 
     * This method will first attempt to create a {@link InputStream} as follows:
     * 
     *   new URL(jarUrlString).openStream();
     * 
     * if that fails with a {@link java.net.MalformedURLException} then the method will
     * attempt to create a {@link InputStream} instance as follows:
     *      *  return new new FileInputStream(
     *      UriComponent.decode(jarUrlString, UriComponent.Type.PATH)));
     * 
     *
     * @param jarUrlString the raw scheme specific part of a URI minus the jar
     *        entry
     * @return a {@link InputStream}.
     * @throws IOException if there is an error opening the stream.
     */
    private InputStream getInputStream(String jarUrlString) throws IOException {
        try {
            return new URL(jarUrlString).openStream();
        } catch (MalformedURLException e) {
            return new FileInputStream(
                    UriComponent.decode(jarUrlString, UriComponent.Type.PATH));
        }
    }
}
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