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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/DefaultOnNullArgument.ftl file.
// See the README in the module's src/template directory for details.
package com.linkedin.dagli.util.function;

import java.util.Objects;


/**
 * A function class implementing Function4.Serializable that returns null if any of
 * the function's inputs are null.
 */
class DefaultOnNullArgument4 implements Function4.Serializable {
  private static final long serialVersionUID = 1;
  private static final int CLASS_HASH = DefaultOnNullArgument4.class.hashCode();
  private final Function4 _wrapped;

  DefaultOnNullArgument4(Function4 wrapped) {
    // stacking this wrapper multiple times should be idempotent:
    if (wrapped instanceof DefaultOnNullArgument4) {
      _wrapped = ((DefaultOnNullArgument4) wrapped)._wrapped;
    } else {
      _wrapped = Objects.requireNonNull(wrapped);
    }
  }

  @Override
  public DefaultOnNullArgument4 safelySerializable() {
    return new DefaultOnNullArgument4<>(((Function4.Serializable) _wrapped).safelySerializable());
  }

  @Override
  public R apply(A value1, B value2, C value3, D value4) {
    if (value1 == null || value2 == null || value3 == null || value4 == null) {
      return null;
    }
    return _wrapped.apply(value1, value2, value3, value4);
  }

  @Override
  public int hashCode() {
    return CLASS_HASH + _wrapped.hashCode();
  }

  @Override
  public boolean equals(Object obj) {
    if (obj instanceof DefaultOnNullArgument4) {
      return this._wrapped.equals(((DefaultOnNullArgument4) obj)._wrapped);
    }
    return false;
  }
}