spring-data-jpa JpaResultConverters 源码
spring-data-jpa JpaResultConverters 代码
文件路径：/spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/query/JpaResultConverters.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.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Blob;
import java.sql.SQLException;
import org.springframework.core.convert.converter.Converter;
import org.springframework.dao.CleanupFailureDataAccessException;
import org.springframework.dao.DataRetrievalFailureException;
import org.springframework.lang.Nullable;
import org.springframework.util.StreamUtils;
/**
* Container for additional JPA result {@link Converter}s.
*
* @author Thomas Darimont
* @author Mark Paluch
* @since 1.6
*/
final class JpaResultConverters {
/**
* {@code private} to prevent instantiation.
*/
private JpaResultConverters() {}
/**
* Converts the given {@link Blob} into a {@code byte[]}.
*
* @author Thomas Darimont
*/
enum BlobToByteArrayConverter implements Converter<Blob, byte[]> {
INSTANCE;
@Nullable
@Override
public byte[] convert(@Nullable Blob source) {
if (source == null) {
return null;
}
InputStream blobStream = null;
try {
blobStream = source.getBinaryStream();
if (blobStream != null) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
StreamUtils.copy(blobStream, baos);
return baos.toByteArray();
}
} catch (SQLException | IOException e) {
throw new DataRetrievalFailureException("Couldn't retrieve data from blob", e);
} finally {
if (blobStream != null) {
try {
blobStream.close();
} catch (IOException e) {
throw new CleanupFailureDataAccessException("Couldn't close binary stream for given blob", e);
}
}
}
return null;
}
}
}
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