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 * License Version 2.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
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 *
 * Software distributed under the License is distributed on an "AS
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package org.jruby.javasupport.ext;

import org.jruby.Ruby;
import org.jruby.RubyIO;
import org.jruby.RubyModule;
import org.jruby.internal.runtime.methods.JavaMethod;
import org.jruby.runtime.Block;
import org.jruby.runtime.Helpers;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;

import java.io.IOException;
import java.io.InputStream;

import static org.jruby.javasupport.JavaUtil.unwrapIfJavaObject;
import static org.jruby.runtime.Visibility.PUBLIC;

/**
 * <code>java.net</code> package Ruby additions.
 *
 * @author kares
 */
public abstract class JavaNet {

    public static void define(final Ruby runtime) {
        JavaExtensions.put(runtime, java.net.URL.class, (proxyClass) -> {
            proxyClass.addMethodInternal("open", new URLOpenMethod(proxyClass));
        });
    }

    private static final class URLOpenMethod extends JavaMethod.JavaMethodZeroOrNBlock {

        URLOpenMethod(RubyModule implClass) {
            super(implClass, PUBLIC, "open");
        }

        @Override
        public IRubyObject call(ThreadContext context, IRubyObject self, RubyModule clazz, String name, Block block) {
            java.net.URL url = unwrapIfJavaObject(self);
            final InputStream stream; final RubyIO io;
            try {
                stream = url.openStream();
                io = JavaIo.to_io(context, stream, null);

                if ( block.isGiven() ) {
                    try {
                        return block.yield(context, io);
                    }
                    finally {
                        stream.close();
                    }
                }
            }
            catch (IOException e) {
                Helpers.throwException(e); return null; // throw context.runtime.newIOErrorFromException(e);
            }
            return io; // unless block_given?
        }

        @Override
        public IRubyObject call(ThreadContext context, IRubyObject self, RubyModule clazz, String name, IRubyObject[] args) {
            return call(context, self, clazz, name, Block.NULL_BLOCK);
        }

        @Override
        public IRubyObject call(ThreadContext context, IRubyObject self, RubyModule clazz, String name, IRubyObject[] args, Block block) {
            return call(context, self, clazz, name, block);
        }

    }

}