Resources.java
/*-
* #%L
* io.earcam.instrumental.reflect
* %%
* Copyright (C) 2018 earcam
* %%
* SPDX-License-Identifier: (BSD-3-Clause OR EPL-1.0 OR Apache-2.0 OR MIT)
*
* You <b>must</b> choose to accept, in full - any individual or combination of
* the following licenses:
* <ul>
* <li><a href="https://opensource.org/licenses/BSD-3-Clause">BSD-3-Clause</a></li>
* <li><a href="https://www.eclipse.org/legal/epl-v10.html">EPL-1.0</a></li>
* <li><a href="https://www.apache.org/licenses/LICENSE-2.0">Apache-2.0</a></li>
* <li><a href="https://opensource.org/licenses/MIT">MIT</a></li>
* </ul>
* #L%
*/package io.earcam.instrumental.reflect;
import static io.earcam.instrumental.reflect.Names.typeToResourceName;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UncheckedIOException;
import java.net.URI;
import javax.annotation.WillClose;
import io.earcam.unexceptional.Exceptional;
/**
* <p>
* Resources class.
* </p>
*
*/
public final class Resources {
private Resources()
{}
/**
* <p>
* classAsBytes.
* </p>
*
* @param type a {@link java.lang.Class} object.
* @return an array of {@link byte} objects.
*/
public static byte[] classAsBytes(Class<?> type)
{
return readAllBytes(classAsStream(type));
}
static byte[] readAllBytes(@WillClose InputStream input)
{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int read;
try(InputStream in = input) {
while((read = in.read()) != -1) {
baos.write(read);
}
} catch(IOException e) {
throw new UncheckedIOException(e);
}
return baos.toByteArray();
}
/**
* <p>
* classAsStream.
* </p>
*
* @param type a {@link java.lang.Class} object.
* @return a {@link java.io.InputStream} object.
*/
public static InputStream classAsStream(Class<?> type)
{
return type.getClassLoader().getResourceAsStream(typeToResourceName(type));
}
/**
* <p>
* sourceOfResource.
* </p>
*
* @param type a {@link java.lang.Class} object.
* @return a {@link java.lang.String} object.
*/
public static String sourceOfResource(Class<?> type)
{
ClassLoader classLoader = type.getClassLoader();
return sourceOfResource(type, classLoader == null ? ClassLoader.getSystemClassLoader() : classLoader);
}
/**
* <p>
* sourceOfResource.
* </p>
*
* @param type a {@link java.lang.Class} object.
* @param classLoader a {@link java.lang.ClassLoader} object.
* @return a {@link java.lang.String} object.
*/
public static String sourceOfResource(Class<?> type, ClassLoader classLoader)
{
String className = Names.typeToResourceName(type);
String resource = removeJarUrlDecoration(Exceptional.uri(classLoader.getResource(className)));
int shebang = resource.indexOf('!');
return shebang > -1 ? resource.substring(0, shebang)
: resource.substring(0, resource.length() - className.length());
}
/**
* <p>
* removeJarUrlDecoration.
* </p>
*
* @param jar a {@link java.net.URI} object.
* @return a {@link java.lang.String} object.
*/
public static String removeJarUrlDecoration(URI jar)
{
return jar.toString()
.replaceFirst("^jar:file:", "")
.replaceFirst("^file:(//)?", "")
.replaceAll("!/$", "");
}
}