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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config;
import java.io.File;
import java.nio.file.Path;
import java.util.Objects;
import java.util.Optional;
/**
* An immutable reference to a model.
* This is a file path when read by a client but is set in a config instance either as a
* path, url or id resolved to an url during deployment.
*
* @author bratseth
*/
public class ModelReference {
// At least one of these are set
private final Optional<String> modelId;
private final Optional<UrlReference> url;
private final Optional<FileReference> path;
public ModelReference(Optional<String> modelId,
Optional<UrlReference> url,
Optional<FileReference> path) {
if (modelId.isEmpty() && url.isEmpty() && path.isEmpty())
throw new IllegalArgumentException("A model reference must have either a model id, url or path");
this.modelId = modelId;
this.url = url;
this.path = path;
}
public Optional<String> modelId() { return modelId; }
public Optional<UrlReference> url() { return url; }
public Optional<FileReference> path() { return path; }
public ModelReference withModelId(Optional<String> modelId) {
return new ModelReference(modelId, url, path);
}
public ModelReference withUrl(Optional<UrlReference> url) {
return new ModelReference(modelId, url, path);
}
public ModelReference withPath(Optional<FileReference> path) {
return new ModelReference(modelId, url, path);
}
/** Returns the path to the file containing this model, or null if not available. */
public Path value() {
if (url.isPresent() && new File(url.get().value()).exists())
return Path.of(url.get().value());
if (path.isPresent())
return Path.of(path.get().value());
return null;
}
@Override
public boolean equals(Object o) {
if ( ! (o instanceof ModelReference other)) return false;
if ( ! this.modelId.equals(other.modelId)) return false;
if ( ! this.url.equals(other.url)) return false;
if ( ! this.path.equals(other.path)) return false;
return true;
}
@Override
public int hashCode() {
return Objects.hash(modelId, url, path);
}
/** Returns this on the format accepted by valueOf */
@Override
public String toString() {
return modelId.orElse("") + " " +
url.map(v -> v.value()).orElse("") + " " +
path.map(v -> v.value()).orElse("");
}
/** Creates a model reference having a model id only. */
public static ModelReference fromModelId(String modelId) {
return new ModelReference(Optional.of(modelId), Optional.empty(), Optional.empty());
}
/** Creates a model reference having a url only. */
public static ModelReference fromUrl(String url) {
return new ModelReference(Optional.empty(), Optional.of(new UrlReference(url)), Optional.empty());
}
/** Creates a model reference having a path only. */
public static ModelReference fromPath(String path) {
return new ModelReference(Optional.empty(), Optional.empty(), Optional.of(new FileReference(path)));
}
/** Creates a model reference having a path only. */
public static ModelReference valueOf(Path path) {
return fromPath(path.toString());
}
/**
* Creates a model reference from a three-part string on the form
* <code>modelId url path</code>
* Each of the elements are either a value not containing space, or empty represented by "".
*/
public static ModelReference valueOf(String s) {
String[] parts = s.split(" ");
if (parts.length != 3)
throw new IllegalArgumentException("Expected a config with exactly three space-separated parts, but got '" + s + "'");
return new ModelReference(parts[0].equals("") ? Optional.empty() : Optional.of(parts[0]),
parts[1].equals("") ? Optional.empty() : Optional.of(new UrlReference(parts[1])),
parts[2].equals("") ? Optional.empty() : Optional.of(new FileReference(parts[2])));
}
}
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