Visit Classes Used

Analyzer.java

import org.apache.bcel.Repository;
import org.apache.bcel.classfile.Constant;
import org.apache.bcel.classfile.ConstantClass;
import org.apache.bcel.classfile.ConstantPool;
import org.apache.bcel.classfile.JavaClass;

/**
 * Prototype code to walk the graph of referenced classes, for use hunting down dead code.
 */
public class Analyzer {

    public static void main(String[] args) throws Exception {
        JavaClass clazz = Repository.lookupClass("Foo");
        Analyzer analyzer = new Analyzer();
        analyzer.traverse(clazz);
    }

    public void traverse(JavaClass node) throws Exception {
        ConstantPool pool = node.getConstantPool();
        for (Constant constant : pool.getConstantPool()) {
            if (constant instanceof ConstantClass) {
                String className = pool.constantToString(constant);
                if (className != node.getClassName() && !className.startsWith("java")) {
                    System.out.println(className);
                    traverse(Repository.lookupClass(className));
                }
            }
        }
    }
}