PredicatesBuilder.java
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package com.bsth.entity.search;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.Path;
import javax.persistence.criteria.Predicate;
import java.text.NumberFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
*
* @ClassName: PredicatesBuilder
* @author PanZhao
* @date 2016年3月16日 下午4:05:07
*
*/
public class PredicatesBuilder {
/**
* Number转换器
*/
private static NumberFormat nf;
static{
nf = NumberFormat.getInstance();
}
public static Predicate eq(CriteriaBuilder cb,Path<?> expression, Object object){
return cb.equal(expression, object);
}
public static Predicate ne(CriteriaBuilder cb,Path<?> expression, Object object){
return cb.notEqual(expression, object);
}
public static Predicate gt(CriteriaBuilder cb,Path<Number> expression, Object object){
try {
return cb.gt(expression, nf.parse(object.toString()));
} catch (ParseException e) {
e.printStackTrace();
return null;
}
}
public static Predicate ge(CriteriaBuilder cb,Path<?> expression, Object object){
Class<?> leftType = expression.getJavaType();
Class<?> rightType = object.getClass();
if (leftType.isAssignableFrom(Number.class) &&
rightType.isAssignableFrom(Number.class)) { // 判定是否是Number类型的子类
return cb.ge((Path<Number>) expression, (Number) object);
} else if (leftType.isAssignableFrom(String.class) &&
rightType.isAssignableFrom(String.class)) { // 判定是否是String类型的子类
return cb.greaterThanOrEqualTo((Path<String>) expression, (String) object);
} else if (leftType.isAssignableFrom(Date.class) &&
rightType.isAssignableFrom(Date.class)) { // 判定是否是Date类型的子类
return cb.greaterThanOrEqualTo((Path<Date>) expression, (Date) object);
} else {
throw new RuntimeException("ge 不支持类型组合：" + expression.getJavaType() + ">=" + object.getClass());
}
}
public static Predicate lt(CriteriaBuilder cb,Path<Number> expression, Object object){
try {
return cb.lt(expression, nf.parse(object.toString()));
} catch (ParseException e) {
e.printStackTrace();
return null;
}
}
public static Predicate le(CriteriaBuilder cb,Path<?> expression, Object object){
Class<?> leftType = expression.getJavaType();
Class<?> rightType = object.getClass();
if (leftType.isAssignableFrom(Number.class) &&
rightType.isAssignableFrom(Number.class)) { // 判定是否是Number类型的子类
return cb.le((Path<Number>) expression, (Number) object);
} else if (leftType.isAssignableFrom(String.class) &&
rightType.isAssignableFrom(String.class)) { // 判定是否是String类型的子类
return cb.lessThanOrEqualTo((Path<String>) expression, (String) object);
} else if (leftType.isAssignableFrom(Date.class) &&
rightType.isAssignableFrom(Date.class)) { // 判定是否是Date类型的子类
return cb.lessThanOrEqualTo((Path<Date>) expression, (Date) object);
} else {
throw new RuntimeException("ge 不支持类型组合：" + expression.getJavaType() + ">=" + object.getClass());
}
}
public static Predicate prefixLike(CriteriaBuilder cb,Path<String> expression, Object object){
return cb.like(expression, object.toString() + "%");
}
public static Predicate prefixNotLike(CriteriaBuilder cb,Path<String> expression, Object object){
return cb.notLike(expression, object.toString() + "%");
}
public static Predicate suffixLike(CriteriaBuilder cb,Path<String> expression, Object object){
return cb.like(expression, "%" + object.toString());
}
public static Predicate suffixNotLike(CriteriaBuilder cb,Path<String> expression, Object object){
return cb.notLike(expression, "%" + object.toString());
}
public static Predicate like(CriteriaBuilder cb,Path<String> expression, Object object){
return cb.like(expression, "%" + object.toString() + "%");
}
public static Predicate notLike(CriteriaBuilder cb,Path<String> expression, Object object){
return cb.notLike(expression, "%" + object.toString() + "%");
}
public static Predicate isNull(CriteriaBuilder cb,Path<String> expression, Object object){
return cb.isNull(expression);
}
public static Predicate isNotNull(CriteriaBuilder cb,Path<String> expression, Object object){
return cb.isNotNull(expression);
}
public static Predicate isf(CriteriaBuilder cb,Path<Boolean> expression, Object object){
return cb.isFalse(expression);
}
public static Predicate ist(CriteriaBuilder cb,Path<Boolean> expression, Object object){
return cb.isTrue(expression);
}
public static Predicate date(CriteriaBuilder cb,Path<?> expression, Object object){
Date time = null;
try {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
time = sdf.parse(object.toString());
} catch (Exception e) {
e.printStackTrace();
}
return cb.equal(expression, time);
}
}