Spring中如何定义Range范围对象

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1 实现方式

1.1 范围对象Range定义

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;  }}