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package org.jruby;

import org.jruby.anno.JRubyMethod;
import org.jruby.anno.JRubyClass;
import org.jruby.runtime.Block;
import org.jruby.runtime.ObjectAllocator;
import static org.jruby.runtime.Visibility.*;
import org.jruby.runtime.builtin.IRubyObject;

@JRubyClass(name="SystemExit", parent="Exception")
public class RubySystemExit extends RubyException {

    IRubyObject status;

    private static final ObjectAllocator ALLOCATOR = new ObjectAllocator() {
        @Override
        public IRubyObject allocate(Ruby runtime, RubyClass klass) {
            return new RubySystemExit(runtime, klass);
        }
    };

    static RubyClass createSystemExitClass(Ruby runtime, RubyClass exceptionClass) {
        RubyClass systemExitClass = runtime.defineClass("SystemExit", exceptionClass, ALLOCATOR);

        systemExitClass.defineAnnotatedMethods(RubySystemExit.class);

        return systemExitClass;
    }

    public static RubySystemExit newInstance(Ruby runtime, int status, String message) {
        final RubyClass klass = runtime.getSystemExit();
        final IRubyObject[] args = new IRubyObject[] {
            runtime.newFixnum(status), runtime.newString(message)
        };
        return (RubySystemExit) klass.newInstance(runtime.getCurrentContext(), args, Block.NULL_BLOCK);
    }

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

    @JRubyMethod(optional = 2, visibility = PRIVATE)
    @Override
    public IRubyObject initialize(IRubyObject[] args, Block block) {
        if (args.length > 0) {
            final IRubyObject arg = args[0];
            if (arg instanceof RubyFixnum) {
                this.status = arg;
                if (args.length > 1) this.message = args[1]; // (status, message)
            }
            else if (arg instanceof RubyBoolean) {
                final Ruby runtime = getRuntime();
                this.status = runtime.newFixnum( arg == runtime.getTrue() ? 0 : 1 );
                if (args.length > 1) this.message = args[1]; // (status, message)
            }
            else {
                this.message = arg;
                this.status = RubyFixnum.zero(getRuntime());
            }
        }
        else {
            this.status = RubyFixnum.zero(getRuntime());
        }
        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();
    }

}
