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A library provides implementation of DAF4J DataAccess using JPA
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package net.cassite.daf4j.jpa;
import net.cassite.daf4j.*;
import net.cassite.daf4j.ds.AroundParser;
import net.cassite.daf4j.ds.DSUtils;
import net.cassite.daf4j.ds.ObjectResolver;
import net.cassite.daf4j.ds.ParserPacket;
import net.cassite.daf4j.util.ConstantMap;
import net.cassite.daf4j.util.Location;
import javax.persistence.*;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
/**
* Around型解释器,将获取信息转化为JPQL
*/
public class JPQLAroundParser implements AroundParser {
private static final String aliasPrefix = "var";
private ParserPacket parserPacket;
/**
* 直接在manager中执行find方法
*
* @param manager EntityManager对象
* @param aClass 要查询的类型
* @param o 主键
* @param 要查询的类型
* @return 查询结果
* @throws Exception 由jpa抛出的异常
*/
@Override
public En find(EntityManager manager, Class aClass, Object o) throws Exception {
return manager.find(aClass, o);
}
/**
* 构造JPQLContext
*
* @param manager EntityManager对象
* @param o 要查询的实体
* @param where 条件子句
* @param queryParameter 查询参数
* @return 生成的上下文
* @throws Exception 由jpa抛出的异常
*/
@Override
public JPQLContext initiateList(EntityManager manager, Object o, Where where, QueryParameter queryParameter) throws Exception {
JPQLContext context = new JPQLContext(manager, o, aliasPrefix);
context.NoDistinctOrAlreadyDone = queryParameter == null || !queryParameter.parameters.containsKey(QueryParameterTypes.distinct);
return context;
}
/**
* 生成完整SELECT子句
*
* @param jpqlContext 上下文
* @return 上下文
* @throws Exception 可能的异常
*/
@Override
public JPQLContext beforeParsingList(JPQLContext jpqlContext) throws Exception {
String alias = jpqlContext.aliasMap.get(new Location(null));
jpqlContext.frontQueries = new StringBuilder("SELECT ");
if (!jpqlContext.NoDistinctOrAlreadyDone) {
jpqlContext.frontQueries.append("DISTINCT ");
}
jpqlContext.frontQueries.append(alias);
jpqlContext.selectNonAggregationAliases.add(alias);
return jpqlContext;
}
/**
* 执行todoList后连接frontQuery到generalJPQL后返回上下文
*
* @param jpqlContext 上下文
* @return 上下文
* @throws Exception 由jpa抛出的异常
*/
@Override
public JPQLContext afterParsingList(JPQLContext jpqlContext) throws Exception {
for (JPQLToDo todo : jpqlContext.toDoAfterJPQLGeneration) {
todo.todo(jpqlContext);
}
jpqlContext.generalJPQL.insert(0, jpqlContext.frontQueries);
return jpqlContext;
}
/**
* 根据generalJPQL生成Query,执行每一条JPQLToDo,填入常量,执行jpaQuery.getResultList()
*
* @param jpqlContext 上下文
* @return 执行结果
* @throws Exception jpa抛出的异常
*/
@Override
public List executeList(JPQLContext jpqlContext) throws Exception {
jpqlContext.jpaQuery = jpqlContext.manager.createQuery(jpqlContext.generalJPQL.toString());
for (JPQLToDo todo : jpqlContext.toDoAfterJPAQueryGeneration) {
todo.todo(jpqlContext);
}
// CONSTANTS
for (Integer i : jpqlContext.constantMap.keySet()) {
jpqlContext.jpaQuery.setParameter(i, jpqlContext.constantMap.get(i));
}
return jpqlContext.jpaQuery.getResultList();
}
/**
* 默认构造JPQLContext
*
* @param manager EntityManager对象
* @param o 要查询的实体
* @param where 查询条件
* @param queryParameterWithFocus 带focus的查询参数
* @return 上下文
* @throws Exception 可能抛出的异常
*/
@Override
public JPQLContext initiateProjection(EntityManager manager, Object o, Where where, QueryParameterWithFocus queryParameterWithFocus) throws Exception {
JPQLContext context = new JPQLContext(manager, o, aliasPrefix);
context.NoDistinctOrAlreadyDone = !queryParameterWithFocus.parameters.containsKey(QueryParameterTypes.distinct);
context.focusMap = queryParameterWithFocus.focusMap;
return context;
}
/**
* 不执行操作直接返回上下文
*
* @param jpqlContext 上下文
* @return 上下文
* @throws Exception 可能的异常
*/
@Override
public JPQLContext beforeParsingProjection(JPQLContext jpqlContext) throws Exception {
return jpqlContext;
}
/**
* 执行todoList,插入select子句
*
* @param jpqlContext 上下文
* @return 查询结果
* @throws Exception jpa抛出的异常
*/
@Override
public JPQLContext afterParsingProjection(JPQLContext jpqlContext) throws Exception {
for (JPQLToDo todo : jpqlContext.toDoAfterJPQLGeneration) {
todo.todo(jpqlContext);
}
jpqlContext.generalJPQL.insert(0, jpqlContext.frontQueries);
return jpqlContext;
}
/**
* 执行TODOList,放入常量,执行查询,并将结果转化为LIST[MAP]
*
* @param jpqlContext 上下文
* @return 查询结果
* @throws Exception jpa抛出的异常
*/
@Override
public List> executeProjection(JPQLContext jpqlContext) throws Exception {
// TODOList
for (JPQLToDo todo : jpqlContext.toDoAfterJPAQueryGeneration) {
todo.todo(jpqlContext);
}
jpqlContext.jpaQuery = jpqlContext.manager.createQuery(jpqlContext.generalJPQL.toString());
// CONSTANTS
for (Integer i : jpqlContext.constantMap.keySet()) {
jpqlContext.jpaQuery.setParameter(i, jpqlContext.constantMap.get(i));
}
// LIST[OBJCET[]] TO LIST[MAP]
List resultList = jpqlContext.jpaQuery.getResultList();
List> list = new ArrayList>(resultList.size());
for (Object res : resultList) {
Map map = new LinkedHashMap();
if (res.getClass().isArray()) {
int i = 0;
for (String alias : jpqlContext.focusMap.values()) {
map.put(alias, ((Object[]) res)[i]);
++i;
}
} else {
map.put(jpqlContext.focusMap.values().iterator().next(), res);
}
list.add(map);
}
for (Integer i : jpqlContext.constantMap.keySet()) {
jpqlContext.jpaQuery.setParameter(i, jpqlContext.constantMap.get(i));
}
return list;
}
/**
* 默认构造JPQLContext
*
* @param manager EntityManager对象
* @param o 更新目标
* @param where 更新条件
* @param updateEntries 更新操作
* @return 上下文
* @throws Exception 可能的异常
*/
@Override
public JPQLContext initiateUpdate(EntityManager manager, Object o, Where where, UpdateEntry[] updateEntries) throws Exception {
return new JPQLContext(manager, o, aliasPrefix);
}
/**
* 直接返回上下文
*
* @param jpqlContext 上下文
* @return 上下文
* @throws Exception 可能的异常
*/
@Override
public JPQLContext beforeParsingUpdate(JPQLContext jpqlContext) throws Exception {
return jpqlContext;
}
/**
* 执行todo后返回上下文
*
* @param jpqlContext 上下文
* @return 上下文
* @throws Exception 可能的异常
*/
@Override
public JPQLContext afterParsingUpdate(JPQLContext jpqlContext) throws Exception {
for (JPQLToDo todo : jpqlContext.toDoAfterJPQLGeneration) {
todo.todo(jpqlContext);
}
return jpqlContext;
}
/**
* 执行todo,放入常量,并在query上执行update
*
* @param jpqlContext 上下文
* @throws Exception jpa抛出的异常
*/
@Override
public void executeUpdate(JPQLContext jpqlContext) throws Exception {
for (JPQLToDo todo : jpqlContext.toDoAfterJPAQueryGeneration) {
todo.todo(jpqlContext);
}
jpqlContext.jpaQuery = jpqlContext.manager.createQuery(jpqlContext.generalJPQL.toString());
for (Integer i : jpqlContext.constantMap.keySet()) {
jpqlContext.jpaQuery.setParameter(i, jpqlContext.constantMap.get(i));
}
jpqlContext.jpaQuery.executeUpdate();
}
/**
* 默认构造JPQLContext
*
* @param manager EntityManager对象
* @param o 删除目标
* @param where 删除条件
* @return 上下文
* @throws Exception 可能的异常
*/
@Override
public JPQLContext initiateRemove(EntityManager manager, Object o, Where where) throws Exception {
return new JPQLContext(manager, o, aliasPrefix);
}
/**
* 直接返回上下文
*
* @param jpqlContext 上下文
* @return 上下文
* @throws Exception 可能的异常
*/
@Override
public JPQLContext beforeParsingRemove(JPQLContext jpqlContext) throws Exception {
return jpqlContext;
}
/**
* 执行todo后返回上下文
*
* @param jpqlContext 上下文
* @return 上下文
* @throws Exception 可能的异常
*/
@Override
public JPQLContext afterParsingRemove(JPQLContext jpqlContext) throws Exception {
for (JPQLToDo todo : jpqlContext.toDoAfterJPQLGeneration) {
todo.todo(jpqlContext);
}
return jpqlContext;
}
/**
* 执行todo,放入常量,并在query上执行remove
*
* @param jpqlContext 上下文
* @throws Exception jpa抛出的异常
*/
@Override
public void executeRemove(JPQLContext jpqlContext) throws Exception {
for (JPQLToDo todo : jpqlContext.toDoAfterJPAQueryGeneration) {
todo.todo(jpqlContext);
}
jpqlContext.jpaQuery = jpqlContext.manager.createQuery("DELETE " + jpqlContext.generalJPQL.toString());
for (Integer i : jpqlContext.constantMap.keySet()) {
jpqlContext.jpaQuery.setParameter(i, jpqlContext.constantMap.get(i));
}
jpqlContext.jpaQuery.executeUpdate();
}
/**
* 直接对数组每一个对象执行manager.persist
*
* @param manager EntityManager对象
* @param objects 要持久化的对象
* @throws Exception jpa抛出的异常
*/
@Override
public void save(EntityManager manager, Object[] objects) throws Exception {
for (Object o : objects) {
manager.persist(o);
}
}
/**
* 生成FROM子句(不包括JOIN),若where完全应当放在having里则生成having子句存放起来.将GeneratingWhere设为true
*
* @param jpqlContext 上下文
* @param where 条件语句
* @return 修改后的上下文
* @throws Exception 可能的异常
*/
@Override
public JPQLContext beforeParsingWhere(JPQLContext jpqlContext, Where where) throws Exception {
jpqlContext.generalJPQL.append(" FROM ").append(jpqlContext.entityClass.getSimpleName()).append(" ").append(jpqlContext.aliasMap.get(new Location(null)));
if (null != where) {
if (where instanceof IExpression && DataUtils.expressionIsAggregate((IExpression) where)
|| where instanceof Condition && null != DataUtils.getAggregate(where)) {
// where => having
jpqlContext.GeneratingWhere = false;
jpqlContext.havingClause = DSUtils.parseWhere(jpqlContext, where, parserPacket.andOrParser, parserPacket.conditionResolver, parserPacket.expressionResolver);
jpqlContext.RequireGroupBy = true;
jpqlContext.protectedConstantMap = jpqlContext.constantMap;
jpqlContext.constantMap = new ConstantMap();
}
}
jpqlContext.GeneratingWhere = true;
return jpqlContext;
}
/**
* 生成JOIN,WHERE,GROUP BY,HAVING子句
*
* @param jpqlContext 上下文
* @param whereStr 条件语句字符串
* @throws Exception 可能的异常
*/
@Override
public void afterParsingWhere(JPQLContext jpqlContext, Where where, final String whereStr) throws Exception {
// JOIN
jpqlContext.toDoAfterJPQLGeneration.add(new JPQLToDo() {
@Override
public void todo(JPQLContext jpqlContext) throws Exception {
StringBuilder sb = new StringBuilder();
for (Location joinLocation : jpqlContext.toJoin.keySet()) {
sb.append(" JOIN ");
if (joinLocation.getLocation().size() == 1) {
sb.append(jpqlContext.aliasMap.get(new Location(null))).append(".");
}
sb.append(joinLocation.toString()).append(" ").append(jpqlContext.toJoin.get(joinLocation));
}
// WHERE
if (jpqlContext.protectedConstantMap == null) {
if (whereStr != null && whereStr.trim().length() != 0) {
sb.append(" WHERE ").append(whereStr);
}
} else {
jpqlContext.constantMap = jpqlContext.protectedConstantMap;
jpqlContext.protectedConstantMap = null;
}
// Group BY
if (jpqlContext.RequireGroupBy && jpqlContext.selectNonAggregationAliases.size() != 0) {
sb.append(" GROUP BY ");
boolean isFirst = true;
for (String s : jpqlContext.selectNonAggregationAliases) {
if (isFirst) {
isFirst = false;
} else {
sb.append(", ");
}
sb.append(s);
}
}
// HAVING
if (jpqlContext.havingClause != null) {
sb.append(" HAVING ").append(jpqlContext.havingClause);
}
jpqlContext.generalJPQL.append(sb.toString());
}
});
}
/**
* 直接返回上下文
*
* @param jpqlContext 上下文
* @param queryParameter 查询参数
* @return 上下文
* @throws Exception 可能的异常
*/
@Override
public JPQLContext beforeParsingQueryParameter(JPQLContext jpqlContext, QueryParameter queryParameter) throws Exception {
return jpqlContext;
}
/**
* 不进行操作
*
* @param jpqlContext 上下文
* @throws Exception jpa抛出的异常
*/
@Override
public void afterParsingQueryParameter(JPQLContext jpqlContext) throws Exception {
// DO NOTHING
}
/**
* 直接返回上下文
*
* @param jpqlContext 上下文
* @param queryParameterWithFocus 带focus的参数
* @return 上下文
* @throws Exception 可能的异常
*/
@Override
public JPQLContext beforeParsingFocusPart(JPQLContext jpqlContext, QueryParameterWithFocus queryParameterWithFocus) throws Exception {
return jpqlContext;
}
/**
* 生成Query对象
*
* @param jpqlContext 上下文
* @throws Exception jpa抛出的异常
*/
@Override
public void afterParsingFocusPart(JPQLContext jpqlContext) throws Exception {
//jpqlContext.jpaQuery = jpqlContext.manager.createQuery(jpqlContext.frontQueries.toString() + jpqlContext.generalJPQL.toString());
}
/**
* 直接返回上下文
*
* @param jpqlContext 上下文
* @param updateEntries 更新项
* @return 上下文
* @throws Exception 可能的异常
*/
@Override
public JPQLContext beforeParsingUpdateEntries(JPQLContext jpqlContext, UpdateEntry[] updateEntries) throws Exception {
return jpqlContext;
}
@Override
public void destroy(EntityManager source) {
source.close();
}
@Override
public void afterParsingUpdateEntries(JPQLContext jpqlContext) throws Exception {
// DO NOTHING
}
@Override
public void setParserPacket(ParserPacket parserPacket) {
this.parserPacket = parserPacket;
}
@Override
public void setObjectResolver(ObjectResolver objectResolver) {
}
}
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