/*
 * Copyright (c) 2011-2019 Contributors to the Eclipse Foundation
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
 * which is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
 */

package io.vertx.core.parsetools;

import io.vertx.codegen.annotations.Fluent;
import io.vertx.codegen.annotations.VertxGen;
import io.vertx.core.Handler;
import io.vertx.core.buffer.Buffer;
import io.vertx.core.parsetools.impl.JsonParserImpl;
import io.vertx.core.streams.ReadStream;

A parser class which allows to incrementally parse json elements and emit json parse events instead of parsing a json
element fully. This parser is convenient for parsing large json structures.

The parser also parses concatenated json streams or line delimited json streams.

The parser can also parse entire object or array when it is convenient, for instance a very large array
of small objects can be parsed efficiently by handling array start/end and object
events.
 Whenever the parser fails to parse or process the stream, the exceptionHandler(Handler<Throwable>) is called with the cause of the failure and the current handling stops. After such event, the parser should not handle data anymore. 
Author:
Julien Viet/**
 * A parser class which allows to incrementally parse json elements and emit json parse events instead of parsing a json
 * element fully. This parser is convenient for parsing large json structures.
 * <p/>
 * The parser also parses concatenated json streams or line delimited json streams.
 * <p/>
 * The parser can also parse entire object or array when it is convenient, for instance a very large array
 * of small objects can be parsed efficiently by handling array <i>start</i>/<i>end</i> and <i>object</i>
 * events.
 * <p/>
 * Whenever the parser fails to parse or process the stream, the {@link #exceptionHandler(Handler)} is called with
 * the cause of the failure and the current handling stops. After such event, the parser should not handle data
 * anymore.
 *
 * @author <a href="mailto:julien@julienviet.com">Julien Viet</a>
 */
@VertxGen
public interface JsonParser extends Handler<Buffer>, ReadStream<JsonEvent> {

  
Create a new JsonParser instance. /**
   * Create a new {@code JsonParser} instance.
   */
  static JsonParser newParser() {
    return new JsonParserImpl(null);
  }

  
Create a new JsonParser instance. /**
   * Create a new {@code JsonParser} instance.
   */
  static JsonParser newParser(ReadStream<Buffer> stream) {
    return new JsonParserImpl(stream);
  }

  
Handle a Buffer, pretty much like calling Handler<Buffer>.handle(Buffer). 
Returns:
 a reference to this, so the API can be used fluently/**
   * Handle a {@code Buffer}, pretty much like calling {@link #handle(Object)}.
   *
   * @return  a reference to this, so the API can be used fluently
   */
  @Fluent
  JsonParser write(Buffer buffer);

  
End the stream, this must be called after all the json stream has been processed.
/**
   * End the stream, this must be called after all the json stream has been processed.
   */
  void end();

  
Flip the parser to emit a stream of events for each new json object.
Returns:
 a reference to this, so the API can be used fluently/**
   * Flip the parser to emit a stream of events for each new json object.
   *
   * @return  a reference to this, so the API can be used fluently
   */
  @Fluent
  JsonParser objectEventMode();

  
Flip the parser to emit a single value event for each new json object.

Json object currently streamed won't be affected.
Returns:
 a reference to this, so the API can be used fluently/**
   * Flip the parser to emit a single value event for each new json object.
   * </p>
   * Json object currently streamed won't be affected.
   *
   * @return  a reference to this, so the API can be used fluently
   */
  @Fluent
  JsonParser objectValueMode();

  
Flip the parser to emit a stream of events for each new json array.
Returns:
 a reference to this, so the API can be used fluently/**
   * Flip the parser to emit a stream of events for each new json array.
   *
   * @return  a reference to this, so the API can be used fluently
   */
  @Fluent
  JsonParser arrayEventMode();

  
Flip the parser to emit a single value event for each new json array.

Json array currently streamed won't be affected.
Returns:
 a reference to this, so the API can be used fluently/**
   * Flip the parser to emit a single value event for each new json array.
   * </p>
   * Json array currently streamed won't be affected.
   *
   * @return  a reference to this, so the API can be used fluently
   */
  @Fluent
  JsonParser arrayValueMode();

  @Override
  JsonParser pause();

  @Override
  JsonParser resume();

  @Override
  JsonParser fetch(long amount);

  @Fluent
  JsonParser endHandler(Handler<Void> endHandler);

  @Fluent
  JsonParser handler(Handler<JsonEvent> handler);

  @Fluent
  JsonParser exceptionHandler(Handler<Throwable> handler);

}