org.reflections.vfs.Vfs Maven / Gradle / Ivy
package org.reflections.vfs;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import org.apache.commons.vfs2.*;
import org.reflections.Reflections;
import org.reflections.ReflectionsException;
import org.reflections.util.ClasspathHelper;
import org.reflections.util.Utils;
import javax.annotation.Nullable;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.*;
import java.util.*;
import java.util.jar.JarFile;
/**
* a simple virtual file system bridge
* use the {@link org.reflections.vfs.Vfs#fromURL(java.net.URL)} to get a {@link org.reflections.vfs.Vfs.Dir},
* then use {@link org.reflections.vfs.Vfs.Dir#getFiles()} to iterate over the {@link org.reflections.vfs.Vfs.File}
*
for example:
*
* Vfs.Dir dir = Vfs.fromURL(url);
* Iterable files = dir.getFiles();
* for (Vfs.File file : files) {
* InputStream is = file.openInputStream();
* }
*
* {@link org.reflections.vfs.Vfs#fromURL(java.net.URL)} uses static {@link org.reflections.vfs.Vfs.DefaultUrlTypes} to resolve URLs.
* It contains VfsTypes for handling for common resources such as local jar file, local directory, jar url, jar input stream and more.
*
It can be plugged in with other {@link org.reflections.vfs.Vfs.UrlType} using {@link org.reflections.vfs.Vfs#addDefaultURLTypes(org.reflections.vfs.Vfs.UrlType)} or {@link org.reflections.vfs.Vfs#setDefaultURLTypes(java.util.List)}.
*
for example:
*
* Vfs.addDefaultURLTypes(new Vfs.UrlType() {
* public boolean matches(URL url) {
* return url.getProtocol().equals("http");
* }
* public Vfs.Dir createDir(final URL url) {
* return new HttpDir(url); //implement this type... (check out a naive implementation on VfsTest)
* }
* });
*
* Vfs.Dir dir = Vfs.fromURL(new URL("http://mirrors.ibiblio.org/pub/mirrors/maven2/org/slf4j/slf4j-api/1.5.6/slf4j-api-1.5.6.jar"));
*
* use {@link org.reflections.vfs.Vfs#findFiles(java.util.Collection, com.google.common.base.Predicate)} to get an
* iteration of files matching given name predicate over given list of urls
*/
public abstract class Vfs {
private static List defaultUrlTypes = Lists.newArrayList(DefaultUrlTypes.values());
/** an abstract vfs dir */
public interface Dir {
String getPath();
Iterable getFiles();
void close();
}
/** an abstract vfs file */
public interface File {
String getName();
String getRelativePath();
InputStream openInputStream() throws IOException;
}
/** a matcher and factory for a url */
public interface UrlType {
boolean matches(URL url) throws Exception;
Dir createDir(URL url) throws Exception;
}
/** the default url types that will be used when issuing {@link org.reflections.vfs.Vfs#fromURL(java.net.URL)} */
public static List getDefaultUrlTypes() {
return defaultUrlTypes;
}
/** sets the static default url types. can be used to statically plug in urlTypes */
public static void setDefaultURLTypes(final List urlTypes) {
defaultUrlTypes = urlTypes;
}
/** add a static default url types to the beginning of the default url types list. can be used to statically plug in urlTypes */
public static void addDefaultURLTypes(UrlType urlType) {
defaultUrlTypes.add(0, urlType);
}
/** tries to create a Dir from the given url, using the defaultUrlTypes */
public static Dir fromURL(final URL url) {
return fromURL(url, defaultUrlTypes);
}
/** tries to create a Dir from the given url, using the given urlTypes*/
public static Dir fromURL(final URL url, final List urlTypes) {
for (UrlType type : urlTypes) {
try {
if (type.matches(url)) {
Dir dir = type.createDir(url);
if (dir != null) return dir;
}
} catch (Throwable e) {
if (Reflections.log != null) {
Reflections.log.warn("could not create Dir using " + type + " from url " + url.toExternalForm() + ". skipping.", e);
}
}
}
throw new ReflectionsException("could not create Vfs.Dir from url, no matching UrlType was found [" + url.toExternalForm() + "]\n" +
"either use fromURL(final URL url, final List urlTypes) or " +
"use the static setDefaultURLTypes(final List urlTypes) or addDefaultURLTypes(UrlType urlType) " +
"with your specialized UrlType.");
}
/** tries to create a Dir from the given url, using the given urlTypes*/
public static Dir fromURL(final URL url, final UrlType... urlTypes) {
return fromURL(url, Lists.newArrayList(urlTypes));
}
/** return an iterable of all {@link org.reflections.vfs.Vfs.File} in given urls, starting with given packagePrefix and matching nameFilter */
public static Iterable findFiles(final Collection inUrls, final String packagePrefix, final Predicate nameFilter) {
Predicate fileNamePredicate = new Predicate() {
public boolean apply(File file) {
String path = file.getRelativePath();
if (path.startsWith(packagePrefix)) {
String filename = path.substring(path.indexOf(packagePrefix) + packagePrefix.length());
return !Utils.isEmpty(filename) && nameFilter.apply(filename.substring(1));
} else {
return false;
}
}
};
return findFiles(inUrls, fileNamePredicate);
}
/** return an iterable of all {@link org.reflections.vfs.Vfs.File} in given urls, matching filePredicate */
public static Iterable findFiles(final Collection inUrls, final Predicate filePredicate) {
Iterable result = new ArrayList();
for (final URL url : inUrls) {
try {
result = Iterables.concat(result,
Iterables.filter(new Iterable() {
public Iterator iterator() {
return fromURL(url).getFiles().iterator();
}
}, filePredicate));
} catch (Throwable e) {
if (Reflections.log != null) {
Reflections.log.error("could not findFiles for url. continuing. [" + url + "]", e);
}
}
}
return result;
}
/**try to get {@link java.io.File} from url*/
public static @Nullable java.io.File getFile(URL url) {
java.io.File file;
String path;
try {
path = url.toURI().getSchemeSpecificPart();
if ((file = new java.io.File(path)).exists()) return file;
} catch (URISyntaxException e) {
}
try {
path = URLDecoder.decode(url.getPath(), "UTF-8");
if (path.contains(".jar!")) path = path.substring(0, path.lastIndexOf(".jar!") + ".jar".length());
if ((file = new java.io.File(path)).exists()) return file;
} catch (UnsupportedEncodingException e) {
}
try {
path = url.toExternalForm();
if (path.startsWith("jar:")) path = path.substring("jar:".length());
if (path.startsWith("wsjar:")) path = path.substring("wsjar:".length());
if (path.startsWith("file:")) path = path.substring("file:".length());
if (path.contains(".jar!")) path = path.substring(0, path.indexOf(".jar!") + ".jar".length());
if ((file = new java.io.File(path)).exists()) return file;
path = path.replace("%20", " ");
if ((file = new java.io.File(path)).exists()) return file;
} catch (Exception e) {
}
return null;
}
/** default url types used by {@link org.reflections.vfs.Vfs#fromURL(java.net.URL)}
*
*
jarFile - creates a {@link org.reflections.vfs.ZipDir} over jar file
*
jarUrl - creates a {@link org.reflections.vfs.ZipDir} over a jar url (contains ".jar!/" in it's name), using Java's {@link JarURLConnection}
*
directory - creates a {@link org.reflections.vfs.SystemDir} over a file system directory
*
jboss vfs - for protocols vfs, using jboss vfs (should be provided in classpath)
*
jboss vfsfile - creates a {@link UrlTypeVFS} for protocols vfszip and vfsfile.
*
bundle - for bundle protocol, using eclipse FileLocator (should be provided in classpath)
*
jarInputStream - creates a {@link JarInputDir} over jar files, using Java's JarInputStream
* */
public static enum DefaultUrlTypes implements UrlType {
jarFile {
public boolean matches(URL url) {
return url.getProtocol().equals("file") && url.toExternalForm().contains(".jar");
}
public Dir createDir(final URL url) throws Exception {
return new ZipDir(new JarFile(getFile(url)));
}
},
jarUrl {
public boolean matches(URL url) {
return "jar".equals(url.getProtocol()) || "zip".equals(url.getProtocol()) || "wsjar".equals(url.getProtocol());
}
public Dir createDir(URL url) throws Exception {
try {
URLConnection urlConnection = url.openConnection();
if (urlConnection instanceof JarURLConnection) {
return new ZipDir(((JarURLConnection) urlConnection).getJarFile());
}
} catch (Throwable e) { /*fallback*/ }
java.io.File file = getFile(url);
if (file != null) {
return new ZipDir(new JarFile(file));
}
return null;
}
},
directory {
public boolean matches(URL url) {
return url.getProtocol().equals("file") && !url.toExternalForm().contains(".jar") &&
getFile(url).isDirectory();
}
public Dir createDir(final URL url) throws Exception {
return new SystemDir(getFile(url));
}
},
jboss_vfs {
public boolean matches(URL url) {
return url.getProtocol().equals("vfs");
}
public Vfs.Dir createDir(URL url) throws Exception {
Object content = url.openConnection().getContent();
Class virtualFile = ClasspathHelper.contextClassLoader().loadClass("org.jboss.vfs.VirtualFile");
java.io.File physicalFile = (java.io.File) virtualFile.getMethod("getPhysicalFile").invoke(content);
String name = (String) virtualFile.getMethod("getName").invoke(content);
java.io.File file = new java.io.File(physicalFile.getParentFile(), name);
if (!file.exists() || !file.canRead()) file = physicalFile;
return file.isDirectory() ? new SystemDir(file) : new ZipDir(new JarFile(file));
}
},
jboss_vfsfile {
public boolean matches(URL url) throws Exception {
return "vfszip".equals(url.getProtocol()) || "vfsfile".equals(url.getProtocol());
}
public Dir createDir(URL url) throws Exception {
return new UrlTypeVFS().createDir(url);
}
},
bundle {
public boolean matches(URL url) throws Exception {
return url.getProtocol().startsWith("bundle");
}
public Dir createDir(URL url) throws Exception {
return fromURL((URL) ClasspathHelper.contextClassLoader().
loadClass("org.eclipse.core.runtime.FileLocator").getMethod("resolve", URL.class).invoke(null, url));
}
},
jarInputStream {
public boolean matches(URL url) throws Exception {
return url.toExternalForm().contains(".jar");
}
public Dir createDir(final URL url) throws Exception {
return new JarInputDir(url);
}
}
}
}