org.deeplearning4j.ui.standalone.ClassPathResource Maven / Gradle / Ivy
package org.deeplearning4j.ui.standalone;
import java.io.*;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
/**
* Simple utility class used to get access to files at the classpath, or packed into jar.
* Based on Spring ClassPathResource implementation + jar internals access implemented.
*
*
* @author [email protected]
*/
public class ClassPathResource {
private String resourceName;
/**
* Builds new ClassPathResource object
*
* @param resourceName String name of resource, to be retrieved
*/
public ClassPathResource(String resourceName) {
if (resourceName == null)
throw new IllegalStateException("Resource name can't be null");
this.resourceName = resourceName;
}
/**
* Returns URL of the requested resource
*
* @return URL of the resource, if it's available in current Jar
*/
private URL getUrl() {
ClassLoader loader = null;
try {
loader = Thread.currentThread().getContextClassLoader();
} catch (Exception e) {
// do nothing
}
if (loader == null) {
loader = ClassPathResource.class.getClassLoader();
}
URL url = loader.getResource(this.resourceName);
if (url == null) {
// try to check for mis-used starting slash
// TODO: see TODO below
if (this.resourceName.startsWith("/")) {
url = loader.getResource(this.resourceName.replaceFirst("[\\\\/]", ""));
if (url != null)
return url;
} else {
// try to add slash, to make clear it's not an issue
// TODO: change this mechanic to actual path purifier
url = loader.getResource("/" + this.resourceName);
if (url != null)
return url;
}
throw new IllegalStateException("Resource '" + this.resourceName + "' cannot be found.");
}
return url;
}
/**
* Returns requested ClassPathResource as File object
*
* Please note: if this method called from compiled jar, temporary file will be created to provide File access
*
* @return File requested at constructor call
* @throws FileNotFoundException
*/
public File getFile() throws FileNotFoundException {
URL url = this.getUrl();
if (isJarURL(url)) {
/*
This is actually request for file, that's packed into jar. Probably the current one, but that doesn't matters.
*/
try {
url = extractActualUrl(url);
File file = File.createTempFile("datavec_temp", "file");
file.deleteOnExit();
ZipFile zipFile = new ZipFile(url.getFile());
ZipEntry entry = zipFile.getEntry(this.resourceName);
if (entry == null) {
if (this.resourceName.startsWith("/")) {
entry = zipFile.getEntry(this.resourceName.replaceFirst("/", ""));
if (entry == null) {
throw new FileNotFoundException("Resource " + this.resourceName + " not found");
}
} else
throw new FileNotFoundException("Resource " + this.resourceName + " not found");
}
long size = entry.getSize();
InputStream stream = zipFile.getInputStream(entry);
FileOutputStream outputStream = new FileOutputStream(file);
byte[] array = new byte[1024];
int rd = 0;
long bytesRead = 0;
do {
rd = stream.read(array);
outputStream.write(array, 0, rd);
bytesRead += rd;
} while (bytesRead < size);
outputStream.flush();
outputStream.close();
stream.close();
zipFile.close();
return file;
} catch (Exception e) {
throw new RuntimeException(e);
}
} else {
/*
It's something in the actual underlying filesystem, so we can just go for it
*/
try {
URI uri = new URI(url.toString().replaceAll(" ", "%20"));
return new File(uri.getSchemeSpecificPart());
} catch (URISyntaxException e) {
return new File(url.getFile());
}
}
}
/**
* Checks, if proposed URL is packed into archive.
*
* @param url URL to be checked
* @return True, if URL is archive entry, False otherwise
*/
private boolean isJarURL(URL url) {
String protocol = url.getProtocol();
return "jar".equals(protocol) || "zip".equals(protocol) || "wsjar".equals(protocol)
|| "code-source".equals(protocol) && url.getPath().contains("!/");
}
/**
* Extracts parent Jar URL from original ClassPath entry URL.
*
* @param jarUrl Original URL of the resource
* @return URL of the Jar file, containing requested resource
* @throws MalformedURLException
*/
private URL extractActualUrl(URL jarUrl) throws MalformedURLException {
String urlFile = jarUrl.getFile();
int separatorIndex = urlFile.indexOf("!/");
if (separatorIndex != -1) {
String jarFile = urlFile.substring(0, separatorIndex);
try {
return new URL(jarFile);
} catch (MalformedURLException var5) {
if (!jarFile.startsWith("/")) {
jarFile = "/" + jarFile;
}
return new URL("file:" + jarFile);
}
} else {
return jarUrl;
}
}
/**
* Returns requested ClassPathResource as InputStream object
*
* @return File requested at constructor call
* @throws FileNotFoundException
*/
public InputStream getInputStream() throws FileNotFoundException {
URL url = this.getUrl();
if (isJarURL(url)) {
try {
url = extractActualUrl(url);
ZipFile zipFile = new ZipFile(url.getFile());
ZipEntry entry = zipFile.getEntry(this.resourceName);
if (entry == null) {
if (this.resourceName.startsWith("/")) {
entry = zipFile.getEntry(this.resourceName.replaceFirst("/", ""));
if (entry == null) {
throw new FileNotFoundException("Resource " + this.resourceName + " not found");
}
} else
throw new FileNotFoundException("Resource " + this.resourceName + " not found");
}
InputStream stream = zipFile.getInputStream(entry);
return stream;
} catch (Exception e) {
throw new RuntimeException(e);
}
} else {
File srcFile = this.getFile();
return new FileInputStream(srcFile);
}
}
}