package io.kubernetes.client.custom;

import com.google.gson.TypeAdapter;
import com.google.gson.annotations.JsonAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;

import java.io.IOException;
import java.math.BigDecimal;
import java.util.Objects;

import org.apache.commons.lang3.ObjectUtils;

@JsonAdapter(Quantity.QuantityAdapter.class)
public class Quantity {

  private final BigDecimal number;
  private Format format;

  public enum Format {
    DECIMAL_EXPONENT(10), DECIMAL_SI(10), BINARY_SI(2);

    private int base;

    Format(final int base) {
      this.base = base;
    }

    public int getBase() {
      return base;
    }
  }

  public Quantity(final BigDecimal number, final Format format) {
    this.number = number;
    this.format = format;
  }

  public Quantity(final String value) {
    this.number = fromString(value).number;
    this.format = fromString(value).format;
  }

  public BigDecimal getNumber() {
    return number;
  }

  public Format getFormat() {
    return format;
  }

  public static Quantity fromString(final String value) {
    return new QuantityFormatter().parse(value);
  }

  public String toSuffixedString() {
    return new QuantityFormatter().format(this);
  }

  @Override
  public String toString() {
    return "Quantity{" +
           "number=" + number +
           ", format=" + format +
           '}';
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    Quantity otherQuantity = (Quantity) o;

    return ObjectUtils.compare(this.number, otherQuantity.number) == 0 &&
           Objects.equals(this.format, otherQuantity.format);
  }

  public class QuantityAdapter extends TypeAdapter<Quantity> {
    @Override
    public void write(JsonWriter jsonWriter, Quantity quantity) throws IOException {
      jsonWriter.value(quantity.toSuffixedString());
    }

    @Override
    public Quantity read(JsonReader jsonReader) throws IOException {
      return Quantity.fromString(jsonReader.nextString());
    }
  }
}

package io.kubernetes.client.custom;

import com.google.gson.TypeAdapter;
import com.google.gson.annotations.JsonAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;

import java.io.IOException;
import java.math.BigDecimal;
import java.util.Objects;

import org.apache.commons.lang3.ObjectUtils;

@JsonAdapter(Quantity.QuantityAdapter.class)
public class Quantity {

  private final BigDecimal number;
  private Format format;

  public enum Format {
    DECIMAL_EXPONENT(10), DECIMAL_SI(10), BINARY_SI(2);

    private int base;

    Format(final int base) {
      this.base = base;
    }

    public int getBase() {
      return base;
    }
  }

  public Quantity(final BigDecimal number, final Format format) {
    this.number = number;
    this.format = format;
  }

  public Quantity(final String value) {
    final Quantity quantity = fromString(value);
    this.number = quantity.number;
    this.format = quantity.format;
  }

  public BigDecimal getNumber() {
    return number;
  }

  public Format getFormat() {
    return format;
  }

  public static Quantity fromString(final String value) {
    return new QuantityFormatter().parse(value);
  }

  public String toSuffixedString() {
    return new QuantityFormatter().format(this);
  }

  @Override
  public String toString() {
    return "Quantity{" +
           "number=" + number +
           ", format=" + format +
           '}';
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    Quantity otherQuantity = (Quantity) o;

    return ObjectUtils.compare(this.number, otherQuantity.number) == 0 &&
           Objects.equals(this.format, otherQuantity.format);
  }

  public class QuantityAdapter extends TypeAdapter<Quantity> {
    @Override
    public void write(JsonWriter jsonWriter, Quantity quantity) throws IOException {
      jsonWriter.value(quantity.toSuffixedString());
    }

    @Override
    public Quantity read(JsonReader jsonReader) throws IOException {
      return Quantity.fromString(jsonReader.nextString());
    }
  }
}

Remove extra `Quantity.fromString()` call