# Source: async_file.js

    /*
     * Copyright 2014 Red Hat, Inc.
     *
     * Red Hat licenses this file to you under the Apache License, version 2.0
     * (the "License"); you may not use this file except in compliance with the
     * License.  You may obtain a copy of the License at:
     *
     * http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
     * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
     * License for the specific language governing permissions and limitations
     * under the License.
     */

    /** @module vertx-js/async_file */
    var utils = require('vertx-js/util/utils');
    var Buffer = require('vertx-js/buffer');
    var WriteStream = require('vertx-js/write_stream');
    var ReadStream = require('vertx-js/read_stream');

    var io = Packages.io;
    var JsonObject = io.vertx.core.json.JsonObject;
    var JAsyncFile = io.vertx.core.file.AsyncFile;

    /**
     Represents a file on the file-system which can be read from, or written to asynchronously.
     <p>
     @class
    */
    var AsyncFile = function(j_val) {

      var j_asyncFile = j_val;
      var that = this;
      ReadStream.call(this, j_val);
      WriteStream.call(this, j_val);

      /**
       This will return <code>true</code> if there are more bytes in the write queue than the value set using {@link AsyncFile#setWriteQueueMaxSize}

       @public

       @return {boolean} true if write queue is full
       */
      this.writeQueueFull = function() {
        var __args = arguments;
        if (__args.length === 0) {
          return j_asyncFile["writeQueueFull()"]();
        } else utils.invalidArgs();
      };

      /**

       @public
       @param handler {function}
       @return {AsyncFile}
       */
      this.handler = function(handler) {
        var __args = arguments;
        if (__args.length === 1 && typeof __args[0] === 'function') {
          j_asyncFile["handler(io.vertx.core.Handler)"](function(jVal) {
          handler(utils.convReturnVertxGen(jVal, Buffer));
        });
          return that;
        } else utils.invalidArgs();
      };

      /**

       @public

       @return {AsyncFile}
       */
      this.pause = function() {
        var __args = arguments;
        if (__args.length === 0) {
          j_asyncFile["pause()"]();
          return that;
        } else utils.invalidArgs();
      };

      /**

       @public

       @return {AsyncFile}
       */
      this.resume = function() {
        var __args = arguments;
        if (__args.length === 0) {
          j_asyncFile["resume()"]();
          return that;
        } else utils.invalidArgs();
      };

      /**

       @public
       @param endHandler {function}
       @return {AsyncFile}
       */
      this.endHandler = function(endHandler) {
        var __args = arguments;
        if (__args.length === 1 && typeof __args[0] === 'function') {
          j_asyncFile["endHandler(io.vertx.core.Handler)"](endHandler);
          return that;
        } else utils.invalidArgs();
      };

      /**
       Write a {@link Buffer} to the file at position <code>position</code> in the file, asynchronously.
       <p>
       If <code>position</code> lies outside of the current size
       of the file, the file will be enlarged to encompass it.
       <p>
       When multiple writes are invoked on the same file
       there are no guarantees as to order in which those writes actually occur
       <p>
       The handler will be called when the write is complete, or if an error occurs.

       @public
       @param buffer {Buffer} the buffer to write
       @param position {number} the position in the file to write it at
       @param handler {function} the handler to call when the write is complete
       @return {AsyncFile} a reference to this, so the API can be used fluently
       */
      this.write = function() {
        var __args = arguments;
        if (__args.length === 1 && typeof __args[0] === 'object' && __args[0]._jdel) {
          j_asyncFile["write(io.vertx.core.buffer.Buffer)"](__args[0]._jdel);
          return that;
        }  else if (__args.length === 3 && typeof __args[0] === 'object' && __args[0]._jdel && typeof __args[1] ==='number' && typeof __args[2] === 'function') {
          j_asyncFile["write(io.vertx.core.buffer.Buffer,long,io.vertx.core.Handler)"](__args[0]._jdel, __args[1], function(ar) {
          if (ar.succeeded()) {
            __args[2](null, null);
          } else {
            __args[2](null, ar.cause());
          }
        });
          return that;
        } else utils.invalidArgs();
      };

      /**

       @public
       @param maxSize {number}
       @return {AsyncFile}
       */
      this.setWriteQueueMaxSize = function(maxSize) {
        var __args = arguments;
        if (__args.length === 1 && typeof __args[0] ==='number') {
          j_asyncFile["setWriteQueueMaxSize(int)"](maxSize);
          return that;
        } else utils.invalidArgs();
      };

      /**

       @public
       @param handler {function}
       @return {AsyncFile}
       */
      this.drainHandler = function(handler) {
        var __args = arguments;
        if (__args.length === 1 && typeof __args[0] === 'function') {
          j_asyncFile["drainHandler(io.vertx.core.Handler)"](handler);
          return that;
        } else utils.invalidArgs();
      };

      /**

       @public
       @param handler {function}
       @return {AsyncFile}
       */
      this.exceptionHandler = function(handler) {
        var __args = arguments;
        if (__args.length === 1 && typeof __args[0] === 'function') {
          j_asyncFile["exceptionHandler(io.vertx.core.Handler)"](function(jVal) {
          handler(utils.convReturnTypeUnknown(jVal));
        });
          return that;
        } else utils.invalidArgs();
      };

      /**
       Close the file. The actual close happens asynchronously.
       The handler will be called when the close is complete, or an error occurs.

       @public
       @param handler {function} the handler
       */
      this.close = function() {
        var __args = arguments;
        if (__args.length === 0) {
          j_asyncFile["close()"]();
        }  else if (__args.length === 1 && typeof __args[0] === 'function') {
          j_asyncFile["close(io.vertx.core.Handler)"](function(ar) {
          if (ar.succeeded()) {
            __args[0](null, null);
          } else {
            __args[0](null, ar.cause());
          }
        });
        } else utils.invalidArgs();
      };

      /**
       Reads <code>length</code> bytes of data from the file at position <code>position</code> in the file, asynchronously.
       <p>
       The read data will be written into the specified <code>Buffer buffer</code> at position <code>offset</code>.
       <p>
       If data is read past the end of the file then zero bytes will be read.<p>
       When multiple reads are invoked on the same file there are no guarantees as to order in which those reads actually occur.
       <p>
       The handler will be called when the close is complete, or if an error occurs.

       @public
       @param buffer {Buffer} the buffer to read into
       @param offset {number} the offset into the buffer where the data will be read
       @param position {number} the position in the file where to start reading
       @param length {number} the number of bytes to read
       @param handler {function} the handler to call when the write is complete
       @return {AsyncFile} a reference to this, so the API can be used fluently
       */
      this.read = function(buffer, offset, position, length, handler) {
        var __args = arguments;
        if (__args.length === 5 && typeof __args[0] === 'object' && __args[0]._jdel && typeof __args[1] ==='number' && typeof __args[2] ==='number' && typeof __args[3] ==='number' && typeof __args[4] === 'function') {
          j_asyncFile["read(io.vertx.core.buffer.Buffer,int,long,int,io.vertx.core.Handler)"](buffer._jdel, offset, position, length, function(ar) {
          if (ar.succeeded()) {
            handler(utils.convReturnVertxGen(ar.result(), Buffer), null);
          } else {
            handler(null, ar.cause());
          }
        });
          return that;
        } else utils.invalidArgs();
      };

      /**
       Same as {@link AsyncFile#flush} but the handler will be called when the flush is complete or if an error occurs

       @public
       @param handler {function}
       @return {AsyncFile}
       */
      this.flush = function() {
        var __args = arguments;
        if (__args.length === 0) {
          j_asyncFile["flush()"]();
          return that;
        }  else if (__args.length === 1 && typeof __args[0] === 'function') {
          j_asyncFile["flush(io.vertx.core.Handler)"](function(ar) {
          if (ar.succeeded()) {
            __args[0](null, null);
          } else {
            __args[0](null, ar.cause());
          }
        });
          return that;
        } else utils.invalidArgs();
      };

      /**
       Sets the position from which data will be read from when using the file as a {@link ReadStream}.

       @public
       @param readPos {number} the position in the file
       @return {AsyncFile} a reference to this, so the API can be used fluently
       */
      this.setReadPos = function(readPos) {
        var __args = arguments;
        if (__args.length === 1 && typeof __args[0] ==='number') {
          j_asyncFile["setReadPos(long)"](readPos);
          return that;
        } else utils.invalidArgs();
      };

      /**
       Sets the position from which data will be written when using the file as a {@link WriteStream}.

       @public
       @param writePos {number} the position in the file
       @return {AsyncFile} a reference to this, so the API can be used fluently
       */
      this.setWritePos = function(writePos) {
        var __args = arguments;
        if (__args.length === 1 && typeof __args[0] ==='number') {
          j_asyncFile["setWritePos(long)"](writePos);
          return that;
        } else utils.invalidArgs();
      };

      // A reference to the underlying Java delegate
      // NOTE! This is an internal API and must not be used in user code.
      // If you rely on this property your code is likely to break if we change it / remove it without warning.
      this._jdel = j_asyncFile;
    };

    // We export the Constructor function
    module.exports = AsyncFile;