spring MetadataStore 源码
spring MetadataStore 代码
文件路径：/spring-context-indexer/src/main/java/org/springframework/context/index/processor/MetadataStore.java
/*
* Copyright 2002-2022 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.context.index.processor;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.annotation.processing.ProcessingEnvironment;
import javax.tools.FileObject;
import javax.tools.StandardLocation;
/**
* Store {@link CandidateComponentsMetadata} on the filesystem.
*
* @author Stephane Nicoll
* @since 5.0
*/
class MetadataStore {
static final String METADATA_PATH = "META-INF/spring.components";
private final ProcessingEnvironment environment;
public MetadataStore(ProcessingEnvironment environment) {
this.environment = environment;
}
public CandidateComponentsMetadata readMetadata() {
try {
return readMetadata(getMetadataResource().openInputStream());
}
catch (IOException ex) {
// Failed to read metadata -> ignore.
return null;
}
}
public void writeMetadata(CandidateComponentsMetadata metadata) throws IOException {
if (!metadata.getItems().isEmpty()) {
try (OutputStream outputStream = createMetadataResource().openOutputStream()) {
PropertiesMarshaller.write(metadata, outputStream);
}
}
}
private CandidateComponentsMetadata readMetadata(InputStream in) throws IOException {
try (in) {
return PropertiesMarshaller.read(in);
}
}
private FileObject getMetadataResource() throws IOException {
return this.environment.getFiler().getResource(StandardLocation.CLASS_OUTPUT, "", METADATA_PATH);
}
private FileObject createMetadataResource() throws IOException {
return this.environment.getFiler().createResource(StandardLocation.CLASS_OUTPUT, "", METADATA_PATH);
}
}
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