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1 實(shí)現(xiàn)方式

1.1 范圍對(duì)象Range定義

import java.io.Serializable;


public class Range<E> implements Serializable {
  private static final long serialVersionUID = 1L;

  private String field;
  private Comparable from;
  private Comparable to;
  private Boolean includeNull;


  public Range(String field) {
    this.field = field;
  }


  public Range(String field, Comparable from, Comparable to) {
    this.field = field;
    this.from = from;
    this.to = to;
  }

  public Range(String field, Comparable from, Comparable to, Boolean includeNull) {
    this.field = field;
    this.from = from;
    this.to = to;
    this.includeNull = includeNull;
  }


  public Range(Range<E> other) {
    this.field = other.getField();
    this.from = other.getFrom();
    this.to = other.getTo();
    this.includeNull = other.getIncludeNull();
  }

  public String getField() {
    return field;
  }

  public Comparable getFrom() {
    return from;
  }


  public void setFrom(Comparable from) {
    this.from = from;
  }

  public boolean isFromSet() {
    return getFrom() != null;
  }


  public Comparable getTo() {
    return to;
  }

  public void setTo(Comparable to) {
    this.to = to;
  }

  public boolean isToSet() {
    return getTo() != null;
  }

  public void setIncludeNull(boolean includeNull) {
    this.includeNull = includeNull;
  }

  public Boolean getIncludeNull() {
    return includeNull;
  }

  public boolean isIncludeNullSet() {
    return includeNull != null;
  }

  public boolean isBetween() {
    return isFromSet() && isToSet();
  }

  public boolean isSet() {
    return isFromSet() || isToSet() || isIncludeNullSet();
  }

  public boolean isValid() {
    if (isBetween()) {
      return getFrom().compareTo(getTo()) <= 0;
    }

    return true;
  }
}

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