spring-data-jpa Meta 源码
spring-data-jpa Meta 代码
文件路径：/spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/query/Meta.java
/*
* Copyright 2014-2022 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 java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* Value object to hold metadata about repository methods.
*
* @author Greg Turnquist
* @since 3.0
* @see org.springframework.data.jpa.repository.Meta
*/
public class Meta {
private enum MetaKey {
COMMENT("comment");
private String key;
MetaKey(String key) {
this.key = key;
}
}
private Map<String, Object> values = Collections.emptyMap();
public Meta() {}
/**
* Copy a {@link Meta} object.
*
* @since 3.0
* @param source
*/
Meta(Meta source) {
this.values = new LinkedHashMap<>(source.values);
}
/**
* Add a comment to the query that is propagated to the profile log.
*
* @param comment
*/
public void setComment(String comment) {
setValue(MetaKey.COMMENT.key, comment);
}
/**
* @return {@literal null} if not set.
*/
@Nullable
public String getComment() {
return getValue(MetaKey.COMMENT.key);
}
/**
* @return
*/
public boolean hasValues() {
return !this.values.isEmpty();
}
/**
* Get {@link Iterable} of set meta values.
*
* @return
*/
public Iterable<Map.Entry<String, Object>> values() {
return Collections.unmodifiableSet(this.values.entrySet());
}
/**
* Sets or removes the value in case of {@literal null} or empty {@link String}.
*
* @param key must not be {@literal null} or empty.
* @param value
*/
void setValue(String key, @Nullable Object value) {
Assert.hasText(key, "Meta key must not be 'null' or blank");
if (values == Collections.EMPTY_MAP) {
values = new LinkedHashMap<>(2);
}
if (value == null || (value instanceof String && !StringUtils.hasText((String) value))) {
this.values.remove(key);
}
this.values.put(key, value);
}
@Nullable
@SuppressWarnings("unchecked")
private <T> T getValue(String key) {
return (T) this.values.get(key);
}
}
相关信息
相关文章
spring-data-jpa AbstractJpaQuery 源码
spring-data-jpa AbstractStringBasedJpaQuery 源码
spring-data-jpa BeanFactoryQueryRewriterProvider 源码
spring-data-jpa DeclaredQuery 源码
spring-data-jpa DefaultJpaEntityMetadata 源码
spring-data-jpa DefaultJpaQueryMethodFactory 源码
spring-data-jpa DefaultQueryEnhancer 源码
spring-data-jpa DelegatingQueryRewriter 源码
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
8、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦