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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config;
import com.yahoo.config.ConfigInstance;
import com.yahoo.config.FileReference;
import java.nio.file.Path;
import static com.yahoo.vespa.config.ConfigPayloadApplier.IdentityPathAcquirer;
/**
* A utility class that can be used to transform config from one format to another.
*
* @author Ulf Lilleengen
* @author hmusum
* @author Tony Vaagenes
*/
public class ConfigTransformer<T extends ConfigInstance> {
/**
* Workaround since FileAcquirer is in a separate module that depends on config.
* Consider moving FileAcquirer into config instead.
*/
public interface PathAcquirer {
Path getPath(FileReference fileReference);
}
private final Class<T> clazz;
private static volatile PathAcquirer pathAcquirer = new IdentityPathAcquirer();
private static volatile UrlDownloader urlDownloader = null;
/**
* For internal use only *
*/
public static void setPathAcquirer(PathAcquirer pathAcquirer) {
ConfigTransformer.pathAcquirer = (pathAcquirer == null) ?
new IdentityPathAcquirer() :
pathAcquirer;
}
public static void setUrlDownloader(UrlDownloader urlDownloader) {
ConfigTransformer.urlDownloader = urlDownloader;
}
/**
* Create a transformer capable of converting payloads to clazz
*
* @param clazz a Class for the config instance which this config payload should create a builder for
*/
public ConfigTransformer(Class<T> clazz) {
this.clazz = clazz;
}
/**
* Create a ConfigBuilder from a payload, based on the <code>clazz</code> supplied.
*
* @param payload a Payload to be transformed to builder
* @return a ConfigBuilder
*/
public ConfigInstance.Builder toConfigBuilder(ConfigPayload payload) {
ConfigInstance.Builder builder = getRootBuilder();
ConfigPayloadApplier<?> creator = new ConfigPayloadApplier<>(builder, pathAcquirer, urlDownloader);
creator.applyPayload(payload);
return builder;
}
private ConfigInstance.Builder getRootBuilder() {
ConfigInstance.Builder builder = null;
Class<?>[] classes = clazz.getDeclaredClasses();
for (Class<?> c : classes) {
if (c.getName().endsWith("Builder")) {
try {
builder = (ConfigInstance.Builder) c.getConstructor().newInstance();
} catch (Exception e) {
throw new RuntimeException("Could not instantiate builder for " + clazz.getName(), e);
}
}
}
if (builder == null) {
throw new RuntimeException("Could not find builder for " + clazz.getName());
} else {
return builder;
}
}
}
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