cloud.piranha.resource.impl.JarResource Maven / Gradle / Ivy
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package cloud.piranha.resource.impl;
import cloud.piranha.resource.api.Resource;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import static java.lang.System.Logger.Level.WARNING;
import java.net.URL;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.stream.Stream;
import java.util.zip.ZipEntry;
/**
* The default JarResource.
*
* @author Manfred Riem ([email protected])
*/
public class JarResource implements Resource {
/**
* Stores the logger.
*/
private static final System.Logger LOGGER = System.getLogger(JarResource.class.getName());
/**
* Stores the JAR file.
*/
private File jarFile;
/**
* Constructor.
*/
public JarResource() {
}
/**
* Constructor.
*
* @param jarFile the JAR file.
*/
public JarResource(File jarFile) {
this.jarFile = jarFile;
}
/**
* {@return the resource}
*/
@Override
public URL getResource(String location) {
URL result = null;
if (location != null) {
try {
try ( JarFile jar = new JarFile(jarFile)) {
if (jar.getJarEntry(location) != null) {
result = new URL("jar:" + jarFile.toURI() + "!/" + location);
}
}
} catch (IOException ioe) {
LOGGER.log(WARNING, "I/O error occurred while getting JAR resource", ioe);
result = null;
}
}
return result;
}
/**
* Get the resource as a stream.
*
*
* Note that this method will read the content of a JAR entry into a
* byte-array to avoid locking the JAR file.
*
*
* @param location the resource location.
* @return the input stream, or null if not found.
* @see Resource#getResourceAsStream(java.lang.String)
*/
@Override
public InputStream getResourceAsStream(String location) {
InputStream result = null;
try ( JarFile jar = new JarFile(jarFile)) {
JarEntry entry = jar.getJarEntry(location.startsWith("/") ? location.substring(1) : location);
if (entry != null) {
InputStream inputStream;
try ( InputStream jarInputStream = jar.getInputStream(entry)) {
inputStream = new BufferedInputStream(jarInputStream);
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
inputStream.transferTo(outputStream);
result = new ByteArrayInputStream(outputStream.toByteArray());
}
inputStream.close();
}
} catch (IOException ioe) {
LOGGER.log(WARNING, "I/O error occurred while getting JAR resource", ioe);
}
return result;
}
@Override
public Stream getAllLocations() {
List entryNames;
try ( JarFile jar = new JarFile(jarFile)) {
entryNames = jar
.stream()
.map(ZipEntry::getName)
.map(x -> "/" + x)
.toList();
} catch (IOException e) {
return Stream.of();
}
return entryNames.stream();
}
/**
* {@return the JAR file}
*/
public File getJarFile() {
return this.jarFile;
}
/**
* Set the JAR file.
*
* @param jarFile the JAR file.
*/
public void setJarFile(File jarFile) {
this.jarFile = jarFile;
}
@Override
public String getName() {
return jarFile.getName();
}
@Override
public String toString() {
return getName() + " " + super.toString();
}
}