spring-data-jpa QueryEnhancerFactory 源码
spring-data-jpa QueryEnhancerFactory 代码
文件路径：/spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/query/QueryEnhancerFactory.java
/*
* Copyright 2022 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
*
* https://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 org.springframework.data.jpa.repository.query;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Encapsulates different strategies for the creation of a {@link QueryEnhancer} from a {@link DeclaredQuery}.
*
* @author Diego Krupitza
* @author Greg Turnquist
* @since 2.7.0
*/
public final class QueryEnhancerFactory {
private static final Log LOG = LogFactory.getLog(QueryEnhancerFactory.class);
private static final boolean JSQLPARSER_IN_CLASSPATH = isJSqlParserInClassPath();
private QueryEnhancerFactory() {}
/**
* Creates a new {@link QueryEnhancer} for the given {@link DeclaredQuery}.
*
* @param query must not be {@literal null}.
* @return an implementation of {@link QueryEnhancer} that suits the query the most
*/
public static QueryEnhancer forQuery(DeclaredQuery query) {
if (qualifiesForJSqlParserUsage(query)) {
return new JSqlParserQueryEnhancer(query);
} else {
return new DefaultQueryEnhancer(query);
}
}
/**
* Checks if a given query can be process with the JSqlParser under the condition that the parser is in the classpath.
*
* @param query the query we want to check
* @return <code>true</code> if JSqlParser is in the classpath and the query is classified as a native query otherwise
* <code>false</code>
*/
private static boolean qualifiesForJSqlParserUsage(DeclaredQuery query) {
return JSQLPARSER_IN_CLASSPATH && query.isNativeQuery();
}
/**
* Checks whether JSqlParser is in classpath or not.
*
* @return <code>true</code> when in classpath otherwise <code>false</code>
*/
private static boolean isJSqlParserInClassPath() {
try {
Class.forName("net.sf.jsqlparser.parser.JSqlParser", false, QueryEnhancerFactory.class.getClassLoader());
LOG.info("JSqlParser is in classpath; If applicable JSqlParser will be used");
return true;
} catch (ClassNotFoundException e) {
return false;
}
}
}
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