patterntesting.runtime.io.Resource Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of patterntesting-rt Show documentation

PatternTesting Runtime (patterntesting-rt) is the runtime component for the PatternTesting framework. It provides the annotations and base classes for the PatternTesting testing framework (e.g. patterntesting-check, patterntesting-concurrent or patterntesting-exception) but can be also used standalone for classpath monitoring or profiling. It uses AOP and AspectJ to perform this feat.

There is a newer version: 2.5.0

Show newest version

/*
 * $Id: Resource.java,v 1.5 2016/02/25 22:37:56 oboehm Exp $
 *
 * Copyright (c) 2016 by Oliver Boehm
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express orimplied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * (c)reated 05.01.2016 by oliver ([email protected])
 */

package patterntesting.runtime.io;

import java.io.*;
import java.net.URI;
import java.util.*;
import java.util.jar.*;

import org.slf4j.*;

import patterntesting.runtime.util.Converter;

/**
 * A resource can be a file, an entry in a jar, tar or zip file or a resource
 * in the classpath.
 *
 * @author oliver
 * @version $Revision: 1.5 $
 * @since 1.6 (05.01.2016)
 */
public class Resource {

    private static final Logger LOG = LoggerFactory.getLogger(Resource.class);
    private final URI uri;

    /**
     * Instantiates a new resource.
     *
     * @param uri the uri
     */
    public Resource(final URI uri) {
        this.uri = uri;
    }

    /**
     * Gets the modification date of the resource.
     *
     * @return the modification date
     * @throws IOException Signals that an I/O exception has occurred.
     */
    public Date getModificationDate() throws IOException {
        String scheme = this.uri.getScheme();
        if ("file".equalsIgnoreCase(scheme)) {
            File file = new File(this.uri);
            return new Date(file.lastModified());
        } else if ("jar".equalsIgnoreCase(scheme)) {
            return getModificationTimeOf(Converter.toFile(this.uri));
        } else {
            LOG.warn("Will return {} as Date for unsupported scheme '{}'.", new Date(0L), scheme);
            return new Date(0L);
        }
    }

    private static Date getModificationTimeOf(final File jarFile) throws IOException {
        String[] parts = jarFile.toString().split("!");
        JarFile jar = new JarFile(parts[0]);
        String entryName = parts[1];
        if (entryName.startsWith("/")) {
            entryName = entryName.substring(1);
        }
        try {
            Enumeration entries = jar.entries();
            while (entries.hasMoreElements()) {
                JarEntry element = entries.nextElement();
                if (entryName.equals(element.getName())) {
                    return new Date(element.getTime());
                }
            }
            LOG.info("Will return {} as Date for missing entry '{}' in {}.", new Date(0L), entryName, jar);
            return new Date(0L);
        } finally {
            jar.close();
        }
    }

    /**
     * To string.
     *
     * @return the string
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
        return this.uri.toString();
    }

}