The Transformer API provides convenient access to different transformers (currently decompilers only) under a unified API. The API is still subject to major changes, but only with a major version bump.
Currently, this API supports the following decompilers :
- Fernflower
- Vineflower (fork of Fernflower)
- Procyon
- CFR
- JD-Core V0 and V1
- JADX
Decompilers can be accessed either via StandardTransformers.Decompilers.ENGINE_* constants.
An example program decompiling a file using Vineflower (fork of Fernflower) is shown below:
package demo;
import com.heliosdecompiler.transformerapi.StandardTransformers;
import com.heliosdecompiler.transformerapi.common.Loader;
import jd.core.DecompilationResult;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.io.IOUtils;
public class Sample {
public byte[] load(String internalName) throws IOException {
InputStream is = this.getClass().getResourceAsStream("/" + internalName + ".class");
return is == null ? null : IOUtils.toByteArray(is);
}
public boolean canLoad(String internalName) {
return this.getClass().getResource("/" + internalName + ".class") != null;
}
public static void main(String[] args) {
Sample sample = new Sample();
Loader loader = new Loader(sample::canLoad, sample::load);
Map<String, String> preferences = new HashMap<>();
try {
String ff = StandardTransformers.Decompilers.ENGINE_VINEFLOWER;
DecompilationResult result =
StandardTransformers.decompile(
loader,
"java/lang/String",
preferences,
ff
);
System.out.println(result.getDecompiledOutput());
} catch (Exception e) {
System.err.println(e);
}
}
}- Agnostic loader utility
- In-memory decompilation (no temp files)
This API will be updated as decompilers receive updates, which means fixes reach you faster.
