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DAG-oriented machine learning framework for bug-resistant, readable, efficient, maintainable and trivially deployable models in Java and other JVM languages

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// AUTOGENERATED CODE.  DO NOT MODIFY DIRECTLY!  Instead, please modify the util/function/MethodReference.ftl file.
// See the README in the module's src/template directory for details.
package com.linkedin.dagli.util.function;

import java.io.IOException;
import java.lang.invoke.LambdaMetafactory;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodType;


/**
 * Represents a safely serializable method reference (assuming the JVM supports {@link MethodReference}, which is not
 * guaranteed).  If the JVM does not support {@link MethodReference}, an exception may be thrown when creating the
 * method reference; fortunately, however, deserialization will not be affected: if you can serialize it, you'll be able
 * to deserialize later on any JVM.
 */
class CharacterMethodReference0 implements CharacterFunction0.Serializable {
  private static final long serialVersionUID = 1;

  // hash and equality distinguish between different types of MethodReferenceX classes even when the underlying method
  // references are identical
  private static final int CLASS_HASH = CharacterMethodReference0.class.hashCode();

  private final MethodReference _methodReference;
  private transient CharacterFunction0 _cachedFunction = null;

  CharacterMethodReference0(MethodReference mr) {
    _methodReference = mr;
    initCachedFunction();
  }

  /**
   * Creates a new instance.
   *
   * The passed func parameter must be a method reference, such as Object::toString or String::length.  A runtime
   * exception will be thrown if func is a function object or an anonymous lambda (e.g. "a -> a + 5").  An exception
   * may also be thrown if your JVM implementation does not support the library's internal method for retrieving
   * information about the passed method reference.
   *
   * @param func a method reference lambda to wrap.  If this function is not safely serializable, a runtime exception
   *        will be thrown.
   */
  public CharacterMethodReference0(Serializable func) {
    if (func instanceof CharacterMethodReference0) {
      // multiple applications of this constructor are idempotent:
      _methodReference = ((CharacterMethodReference0) func)._methodReference;
    } else {
      // this line will thrown an exception if func is not a method reference:
      _methodReference = new MethodReference(func);
    }
    initCachedFunction();
  }

  // deserialization hook to ensure _cachedFunction is always set
  private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException {
    in.defaultReadObject();
    initCachedFunction();
  }

  private void initCachedFunction() {
    if (_cachedFunction == null) {
      _cachedFunction = fromMethodReference();
    }
  }

  private CharacterFunction0 fromMethodReference() {
    if (_methodReference.isBound()) {
      CharacterMethodReference1