spring-data-jpa JSqlParserUtils 源码
spring-data-jpa JSqlParserUtils 代码
文件路径：/spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/query/JSqlParserUtils.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 net.sf.jsqlparser.expression.Expression;
import net.sf.jsqlparser.expression.Function;
import net.sf.jsqlparser.expression.operators.relational.ExpressionList;
import net.sf.jsqlparser.schema.Column;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
/**
* A utility class for JSqlParser.
*
* @author Diego Krupitza
* @author Greg Turnquist
* @since 2.7.0
*/
public final class JSqlParserUtils {
private JSqlParserUtils() {}
/**
* Generates a count function call, based on the {@code countFields}.
*
* @param countFields the non-empty list of fields that are used for counting
* @param distinct if it should be a distinct count
* @return the generated count function call
*/
public static Function getJSqlCount(final List<String> countFields, final boolean distinct) {
List<Expression> countColumns = countFields //
.stream() //
.map(Column::new) //
.collect(Collectors.toList());
ExpressionList countExpression = new ExpressionList(countColumns);
return new Function() //
.withName("count") //
.withParameters(countExpression) //
.withDistinct(distinct);
}
/**
* Generates a lower function call, based on the {@code column}.
*
* @param column the non-empty column to use as param for lower
* @return the generated lower function call
*/
public static Function getJSqlLower(String column) {
List<Expression> expressions = Collections.singletonList(new Column(column));
ExpressionList lowerParamExpression = new ExpressionList(expressions);
return new Function() //
.withName("lower") //
.withParameters(lowerParamExpression);
}
}
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