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Create a well-defined, cross-language specification for data compute operations

There is a newer version: 0.46.1

package io.substrait.util;

import java.util.function.Supplier;

public class Util {
  static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(Util.class);

  public static  Supplier memoize(Supplier supplier) {
    return new Memoizer(supplier);
  }

  private static class Memoizer implements Supplier {

    private boolean retrieved;
    private T value;
    private Supplier delegate;

    public Memoizer(Supplier delegate) {
      this.delegate = delegate;
    }

    @Override
    public T get() {
      if (!retrieved) {
        value = delegate.get();
        retrieved = true;
      }
      return value;
    }
  }

  public static class IntRange {
    private final int startInclusive;
    private final int endExclusive;

    public static IntRange of(int startInclusive, int endExclusive) {
      return new IntRange(startInclusive, endExclusive);
    }

    private IntRange(int startInclusive, int endExclusive) {
      this.startInclusive = startInclusive;
      this.endExclusive = endExclusive;
    }

    public int getStartInclusive() {
      return startInclusive;
    }

    public int getEndExclusive() {
      return endExclusive;
    }

    public boolean within(int val) {
      return val >= startInclusive && val < endExclusive;
    }
  }
}