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• JacksonStreams.java

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com.adgear.anoa.read.JacksonStreams Maven / Gradle / Ivy

package com.adgear.anoa.read;

import com.adgear.anoa.Anoa;
import com.adgear.anoa.AnoaHandler;
import com.fasterxml.jackson.core.FormatSchema;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.ObjectCodec;
import com.fasterxml.jackson.core.TreeNode;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.UncheckedIOException;
import java.net.URL;
import java.util.Optional;
import java.util.stream.Stream;

/**
 * Utility class for deserializing Jackson {@link com.fasterxml.jackson.core.TreeNode} instances as
 * a {@link java.util.stream.Stream}.
 *
 * Intended to be used as a base class, subclasses should wrap appropriate Jackson databinding types
 * together; see the anoa-tools module for examples.
 *
 * @param  Record type
 * @param  Mapper type
 * @param  Factory type
 * @param  Schema type
 * @param 
 Parser type
 */
public class JacksonStreams<
    N extends TreeNode,
    C extends ObjectCodec,
    F extends JsonFactory,
    S extends FormatSchema,
    P extends JsonParser> {

  /**
   * The object mapper used by this instance
   */
  final public C objectCodec;

  /**
   * The factory used by this instance
   */
  final public F factory;

  /**
   * The (optional) format schema used by this instance
   */
  final public Optional schema;

  /**
   * @param objectCodec Jackson object mapper instance
   * @param schema Jackson format schema (optional)
   */
  @SuppressWarnings("unchecked")
  public JacksonStreams(/*@NonNull*/ C objectCodec, /*@NonNull*/ Optional schema) {
    this.objectCodec = objectCodec;
    this.factory = (F) objectCodec.getFactory();
    this.factory.setCodec(this.objectCodec);
    this.schema = schema;
  }

  @SuppressWarnings("unchecked")
  public /*@NonNull*/ P parser(/*@NonNull*/ InputStream inputStream) {
    try {
      return with((P) factory.createParser(new BufferedInputStream(inputStream)));
    } catch (IOException e) {
      throw new UncheckedIOException(e);
    }
  }

  @SuppressWarnings("unchecked")
  public /*@NonNull*/ P parser(/*@NonNull*/ Reader reader) {
    try {
      return with((P) factory.createParser(new BufferedReader(reader)));
    } catch (IOException e) {
      throw new UncheckedIOException(e);
    }
  }

  @SuppressWarnings("unchecked")
  public /*@NonNull*/ P parser(/*@NonNull*/ byte[] bytes) {
    try {
      return with((P) factory.createParser(bytes));
    } catch (IOException e) {
      throw new UncheckedIOException(e);
    }
  }

  @SuppressWarnings("unchecked")
  public /*@NonNull*/ P parser(/*@NonNull*/ String string) {
    try {
      return with((P) factory.createParser(string));
    } catch (IOException e) {
      throw new UncheckedIOException(e);
    }
  }

  @SuppressWarnings("unchecked")
  public /*@NonNull*/ P parser(/*@NonNull*/ File file) {
    try {
      return with((P) factory.createParser(file));
    } catch (IOException e) {
      throw new UncheckedIOException(e);
    }
  }

  @SuppressWarnings("unchecked")
  public /*@NonNull*/ P parser(/*@NonNull*/ URL url) {
    try {
      return with((P) factory.createParser(url));
    } catch (IOException e) {
      throw new UncheckedIOException(e);
    }
  }

  /**
   * @return the parser passed as argument, after setting the current object mapper and schema
   */
  public /*@NonNull*/ P with(/*@NonNull*/ P parser) {
    parser.setCodec(objectCodec);
    schema.ifPresent(parser::setSchema);
    return parser;
  }

  public /*@NonNull*/ Stream from(/*@NonNull*/ P parser) {
    return LookAheadIteratorFactory.jackson(parser).asStream();
  }

  public /*@NonNull*/ Stream from(/*@NonNull*/ InputStream inputStream) {
    return from(parser(inputStream));
  }

  public /*@NonNull*/ Stream from(/*@NonNull*/ Reader reader) {
    return from(parser(reader));
  }

  public /*@NonNull*/ Stream from(/*@NonNull*/ byte[] bytes) {
    return from(parser(bytes));
  }

  public /*@NonNull*/ Stream from(/*@NonNull*/ String string) {
    return from(parser(string));
  }

  public /*@NonNull*/ Stream from(/*@NonNull*/ File file) {
    return from(parser(file));
  }

  public /*@NonNull*/ Stream from(/*@NonNull*/ URL url) {
    return from(parser(url));
  }

  public  /*@NonNull*/ Stream> from(/*@NonNull*/ AnoaHandler anoaHandler,
                                              /*@NonNull*/ P parser) {
    return LookAheadIteratorFactory.jackson(anoaHandler, parser).asStream();
  }

  public  /*@NonNull*/ Stream> from(/*@NonNull*/ AnoaHandler anoaHandler,
                                              /*@NonNull*/ InputStream inputStream) {
    return from(anoaHandler, parser(inputStream));
  }

  public  /*@NonNull*/ Stream> from(/*@NonNull*/ AnoaHandler anoaHandler,
                                              /*@NonNull*/ Reader reader) {
    return from(anoaHandler, parser(reader));
  }

  public  /*@NonNull*/ Stream> from(/*@NonNull*/ AnoaHandler anoaHandler,
                                              /*@NonNull*/ byte[] bytes) {
    return from(anoaHandler, parser(bytes));
  }

  public  /*@NonNull*/ Stream> from(/*@NonNull*/ AnoaHandler anoaHandler,
                                              /*@NonNull*/ String string) {
    return from(anoaHandler, parser(string));
  }

  public  /*@NonNull*/ Stream> from(/*@NonNull*/ AnoaHandler anoaHandler,
                                              /*@NonNull*/ File file) {
    return from(anoaHandler, parser(file));
  }

  public  /*@NonNull*/ Stream> from(/*@NonNull*/ AnoaHandler anoaHandler,
                                              /*@NonNull*/ URL url) {
    return from(anoaHandler, parser(url));
  }
}