/*
* Copyright 2013-2014 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.github.dactiv.orm.core.spring.data.jpa.restriction;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.Path;
import javax.persistence.criteria.Predicate;
import org.apache.commons.lang3.StringUtils;
import com.github.dactiv.common.utils.ConvertUtils;
import com.github.dactiv.orm.core.PropertyFilter;
import com.github.dactiv.orm.core.spring.data.jpa.specification.SpecificationEntity;
import org.springframework.util.Assert;
/**
* 对{@link PropertyFilter#getMatchValue()}的特殊情况值做处理，例如 in, not in, between的多值情况,
* 该类值处理一种情况
*
* <p>
* 例如:
* </p>
*
* INI_property = "1,2,3,4";
* <p>
* 会产生的sql为: property in (1,2,3,4)
*
* @author maurice
*
*/
public abstract class PredicateMultipleValueSupport extends PredicateSingleValueSupport{
/**
* 将得到值与指定分割符号,分割,得到数组
*
* @param value 值
* @param type 值类型
*
* @return Object
*/
public Object convertMatchValue(String value, Class<?> type) {
Assert.notNull(value,"值不能为空");
String[] result = StringUtils.splitByWholeSeparator(value, getAndValueSeparator());
return ConvertUtils.convertToObject(result,type);
}
/*
* (non-Javadoc)
* @see com.github.dactiv.orm.core.spring.data.jpa.restriction.PredicateSingleValueSupport#build(com.github.dactiv.orm.core.PropertyFilter, com.github.dactiv.orm.core.spring.data.jpa.JpaBuilderModel)
*/
public Predicate build(PropertyFilter filter, SpecificationEntity entity) {
Object value = convertMatchValue(filter.getMatchValue(), filter.getFieldType());
Predicate predicate = null;
if (filter.hasMultiplePropertyNames()) {
Predicate orDisjunction = entity.getBuilder().disjunction();
for (String propertyName:filter.getPropertyNames()) {
orDisjunction.getExpressions().add(build(propertyName,value,entity));
}
predicate = orDisjunction;
} else {
predicate = build(filter.getSinglePropertyName(),value,entity);
}
return predicate;
}
/*
* (non-Javadoc)
* @see com.github.dactiv.orm.core.spring.data.jpa.restriction.PredicateSingleValueSupport#build(javax.persistence.criteria.Path, java.lang.Object, javax.persistence.criteria.CriteriaBuilder)
*/
public Predicate build(Path<?> expression, Object value,CriteriaBuilder builder) {
return buildRestriction(expression,(Object[])value,builder);
}
/**
* 获取Jpa的约束标准
*
* @param expression root路径
* @param values 值
* @param builder CriteriaBuilder
*
* @return {@link Predicate}
*/
public abstract Predicate buildRestriction(Path<?> expression,Object[] values,CriteriaBuilder builder);
}