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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.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 {
// Either: If unresolved, at least one of these are set
private final Optional<String> modelId;
private final Optional<UrlReference> url;
private final Optional<FileReference> path;
// Or: If resolved, this is set
private final Path resolved;
private ModelReference(Optional<String> modelId,
Optional<UrlReference> url,
Optional<FileReference> path,
Path resolved) {
this.modelId = modelId;
this.url = url;
this.path = path;
this.resolved = resolved;
}
/** Returns whether this is already resolved. */
public boolean isResolved() { return resolved != null; }
/** Returns the id specified for this model, oor null if it is resolved. */
public Optional<String> modelId() { return modelId; }
/** Returns the url specified for this model, or null if it is resolved. */
public Optional<UrlReference> url() { return url; }
/** Returns the path specified for this model, or null if it is resolved. */
public Optional<FileReference> path() { return path; }
/** Returns the path to the file containing this model, or null if this is unresolved. */
public Path value() { return resolved; }
@Override
public boolean equals(Object o) {
if ( ! (o instanceof ModelReference other)) return false;
if ( ! Objects.equals(this.modelId, other.modelId)) return false;
if ( ! Objects.equals(this.url, other.url)) return false;
if ( ! Objects.equals(this.path, other.path)) return false;
if ( ! Objects.equals(this.resolved, other.resolved)) return false;
return true;
}
@Override
public int hashCode() {
return Objects.hash(modelId, url, path, resolved);
}
/** Returns this on the format accepted by valueOf */
@Override
public String toString() {
if (resolved != null) return resolved.toString();
return modelId.orElse("\"\"") + " " +
url.map(UrlReference::value).orElse("\"\"") + " " +
path.map(FileReference::value).orElse("\"\"");
}
/**
* Creates a model reference which is either a single string with no spaces if resolved, or if unresolved
* a three-part string on the form <code>modelId url path</code>, where
* each of the elements is either a value not containing space, or empty represented by "".
*/
public static ModelReference valueOf(String s) {
String[] parts = s.split(" ");
if (parts.length == 1)
return resolved(Path.of(s));
else if (parts.length == 3)
return unresolved(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])));
else
throw new IllegalArgumentException("Unexpected model reference string '" + s + "'");
}
/** Creates an unresolved reference from a model id only. */
public static ModelReference unresolved(String modelId) {
return new ModelReference(Optional.of(modelId), Optional.empty(), Optional.empty(), null);
}
/** Creates an unresolved reference from an url only. */
public static ModelReference unresolved(UrlReference url) {
return new ModelReference(Optional.empty(), Optional.of(url), Optional.empty(), null);
}
/** Creates an unresolved reference from a path only. */
public static ModelReference unresolved(FileReference path) {
return new ModelReference(Optional.empty(), Optional.empty(), Optional.of(path), null);
}
/** Creates an unresolved reference. */
public static ModelReference unresolved(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");
return new ModelReference(modelId, url, path, null);
}
/** Creates a resolved reference. */
public static ModelReference resolved(Path path) {
return new ModelReference(null, null, null, Objects.requireNonNull(path));
}
}
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