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package org.jruby;

import org.jruby.anno.JRubyMethod;
import org.jruby.anno.JRubyClass;
import org.jruby.exceptions.RaiseException;
import org.jruby.exceptions.SystemExit;
import org.jruby.runtime.Arity;
import org.jruby.runtime.Block;

import static org.jruby.api.Convert.asFixnum;
import static org.jruby.api.Create.newString;
import static org.jruby.api.Define.defineClass;
import static org.jruby.runtime.Visibility.*;

import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;

/**
 * The Java representation of a Ruby SystemExit.
 *
 * @see SystemExit
 */
@JRubyClass(name="SystemExit", parent="Exception")
public class RubySystemExit extends RubyException {

    IRubyObject status;

    static RubyClass define(ThreadContext context, RubyClass Exception) {
        return defineClass(context, "SystemExit", Exception, RubySystemExit::new).
                defineMethods(context, RubySystemExit.class);
    }

    @Deprecated
    public static RubySystemExit newInstance(Ruby runtime, int status, String message) {
        return newInstance(runtime.getCurrentContext(), status, message);
    }

    public static RubySystemExit newInstance(ThreadContext context, int status, String message) {
        final RubyClass klass = context.runtime.getSystemExit();
        final IRubyObject[] args = new IRubyObject[] { asFixnum(context, status), newString(context, message) };

        return (RubySystemExit) klass.newInstance(context, args, Block.NULL_BLOCK);
    }

    protected RubySystemExit(Ruby runtime, RubyClass exceptionClass) {
        super(runtime, exceptionClass);
        status = runtime.getNil();
    }

    @Override
    protected RaiseException constructThrowable(String message) {
        return new SystemExit(message, this);
    }

    @Deprecated
    @Override
    public IRubyObject initialize(IRubyObject[] args, Block block) {
        return initialize(getRuntime().getCurrentContext(), args, block);
    }

    @JRubyMethod(optional = 2, checkArity = false, visibility = PRIVATE)
    public IRubyObject initialize(ThreadContext context, IRubyObject[] args, Block block) {
        int argc = Arity.checkArgumentCount(context, args, 0, 2);

        if (argc > 0) {
            final IRubyObject arg = args[0];
            if (arg instanceof RubyFixnum) {
                this.status = arg;
                if (argc > 1) this.message = args[1]; // (status, message)
            } else if (arg instanceof RubyBoolean) {
                this.status = asFixnum(context, arg == context.tru ? 0 : 1 );
                if (argc > 1) this.message = args[1]; // (status, message)
            } else {
                this.message = arg;
                this.status = RubyFixnum.zero(context.runtime);
            }
        } else {
            this.status = RubyFixnum.zero(context.runtime);
        }
        super.initialize(NULL_ARRAY, block);
        return this;
    }

    @JRubyMethod
    public IRubyObject status() {
        return status;
    }

    @JRubyMethod(name = "success?")
    public IRubyObject success_p() {
        final Ruby runtime = getRuntime();
        final IRubyObject status = this.status;
        if ( status.isNil() ) return runtime.getTrue();
        if ( status == runtime.getTrue() || status == runtime.getFalse() ) return status;
        if ( status.equals(RubyFixnum.zero(runtime)) ) return runtime.getTrue();
        return runtime.getFalse();
    }

}
