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A backend for Cucumber JVM that uses Nashorn instead of Rhino

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package cucumber.runtime.nashorn;

import static java.util.Arrays.asList;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import gherkin.TagExpression;
import gherkin.formatter.model.Tag;

import java.util.Collection;

import javax.script.Bindings;
import javax.script.ScriptEngine;

import cucumber.api.Scenario;
import cucumber.runtime.HookDefinition;
import cucumber.runtime.Timeout;

public class NashornHookDefinition implements HookDefinition {
	private ScriptEngine engine;
	private Bindings engineScope;

    private Object fn;
    private final TagExpression tagExpression;
    private final int order;
    private final long timeoutMillis;
    private StackTraceElement location;

    public NashornHookDefinition(ScriptEngine engine, Bindings engineScope, Object fn, String[] tagExpressions, int order, long timeoutMillis, StackTraceElement location) {
    	this.engine = engine;
    	this.engineScope = engineScope;
        this.fn = fn;
        this.tagExpression = new TagExpression(asList(tagExpressions));
        this.order = order;
        this.timeoutMillis = timeoutMillis;
        this.location = location;
    }

    @Override
    public String getLocation(boolean detail) {
        return location.getFileName() + ":" + location.getLineNumber();
    }

    @Override
    public void execute(Scenario scenario) throws Throwable {
        final Object[] args = new Object[] { scenario };
        Timeout.timeout(new Timeout.Callback