spring-data-jpa JpaEvaluationContextExtension 源码
spring-data-jpa JpaEvaluationContextExtension 代码
文件路径：/spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/support/JpaEvaluationContextExtension.java
/*
* Copyright 2019-2022 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.support;
import org.springframework.data.jpa.repository.query.EscapeCharacter;
import org.springframework.data.spel.spi.EvaluationContextExtension;
/**
* {@link EvaluationContextExtension} to register {@link EscapeCharacter} as root object to essentially expose an
* {@code expose(…)} function to SpEL.
*
* @author Oliver Drotbohm
*/
public class JpaEvaluationContextExtension implements EvaluationContextExtension {
private final JpaRootObject root;
/**
* Creates a new {@link JpaEvaluationContextExtension} for the given escape character.
*
* @param escapeCharacter the character to be used to escape parameters for LIKE expression.
*/
public JpaEvaluationContextExtension(char escapeCharacter) {
this.root = JpaRootObject.of(EscapeCharacter.of(escapeCharacter));
}
@Override
public String getExtensionId() {
return "jpa";
}
@Override
public Object getRootObject() {
return root;
}
public static class JpaRootObject {
private final EscapeCharacter character;
private JpaRootObject(EscapeCharacter character) {
this.character = character;
}
public static JpaRootObject of(EscapeCharacter character) {
return new JpaRootObject(character);
}
/**
* Escapes the given source {@link String} for LIKE expressions.
*
* @param source can be {@literal null}.
* @return
* @see EscapeCharacter#escape(String)
*/
public String escape(String source) {
return character.escape(source);
}
/**
* Returns the escape character being used to escape special characters for LIKE expressions.
*
* @return
*/
public char escapeCharacter() {
return character.getEscapeCharacter();
}
}
}
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