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

/**
 * Ruby's StopIteration exception.
 * @see RubyEnumerator
 * @author kares
 */
@JRubyClass(name="StopIteration", parent="IndexError")
public class RubyStopIteration extends RubyException {

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

    static RubyClass createStopIterationClass(Ruby runtime, RubyClass superClass) {
        RubyClass StopIteration = runtime.defineClass("StopIteration", superClass, ALLOCATOR);
        StopIteration.defineAnnotatedMethods(RubyStopIteration.class);
        return StopIteration;
    }

    public static RubyStopIteration newInstance(ThreadContext context, IRubyObject result, String message) {
        final Ruby runtime = context.runtime;
        RubyClass StopIteration = runtime.getStopIteration();
        final IRubyObject msg = message == null ? context.nil : runtime.newString(message);
        RubyStopIteration instance = (RubyStopIteration)
                StopIteration.newInstance(context, msg, Block.NULL_BLOCK);
        instance.result = result;
        return instance;
    }

    private IRubyObject result;

    protected RubyStopIteration(Ruby runtime, RubyClass exceptionClass) {
        super(runtime, exceptionClass);
    }

    @JRubyMethod
    public IRubyObject result() {
        return result == null ? getRuntime().getNil() : result;
    }

}