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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.rankingexpression.importer;
import com.google.common.collect.ImmutableMap;
import com.yahoo.path.Path;
import java.io.File;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
/**
* All models imported from the models/ directory in the application package.
* If this is empty it may be due to either not having any models in the application package,
* or this being created for a ZooKeeper application package, which does not have imported models.
*
* @author bratseth
*/
public class ImportedModels {
/** All imported models, indexed by their names */
private final ImmutableMap<String, ImportedModel> importedModels;
/** Create a null imported models */
public ImportedModels() {
importedModels = ImmutableMap.of();
}
public ImportedModels(File modelsDirectory, Collection<ModelImporter> importers) {
Map<String, ImportedModel> models = new HashMap<>();
// Find all subdirectories recursively which contains a model we can read
importRecursively(modelsDirectory, models, importers);
importedModels = ImmutableMap.copyOf(models);
}
private static void importRecursively(File dir,
Map<String, ImportedModel> models,
Collection<ModelImporter> importers) {
if ( ! dir.isDirectory()) return;
Arrays.stream(dir.listFiles()).sorted().forEach(child -> {
Optional<ModelImporter> importer = findImporterOf(child, importers);
if (importer.isPresent()) {
String name = toName(child);
ImportedModel existing = models.get(name);
if (existing != null)
throw new IllegalArgumentException("The models in " + child + " and " + existing.source() +
" both resolve to the model name '" + name + "'");
models.put(name, importer.get().importModel(name, child));
}
else {
importRecursively(child, models, importers);
}
});
}
private static Optional<ModelImporter> findImporterOf(File path, Collection<ModelImporter> importers) {
return importers.stream().filter(item -> item.canImport(path.toString())).findFirst();
}
/**
* Returns the model at the given location in the application package.
*
* @param modelPath the path to this model (file or directory, depending on model type)
* under the application package, both from the root or relative to the
* models directory works
* @return the model at this path or null if none
*/
public ImportedModel get(File modelPath) {
return importedModels.get(toName(modelPath));
}
public ImportedModel get(String modelName) {
return importedModels.get(modelName);
}
/** Returns an immutable collection of all the imported models */
public Collection<ImportedModel> all() {
return importedModels.values();
}
private static String toName(File modelFile) {
Path modelPath = Path.fromString(modelFile.toString());
if (modelFile.isFile())
modelPath = stripFileEnding(modelPath);
String localPath = concatenateAfterModelsDirectory(modelPath);
return localPath.replace('.', '_');
}
private static Path stripFileEnding(Path path) {
int dotIndex = path.last().lastIndexOf(".");
if (dotIndex <= 0) return path;
return path.withLast(path.last().substring(0, dotIndex));
}
private static String concatenateAfterModelsDirectory(Path path) {
boolean afterModels = false;
StringBuilder result = new StringBuilder();
for (String element : path.elements()) {
if (afterModels) result.append(element).append("_");
if (element.equals("models")) afterModels = true;
}
return result.substring(0, result.length()-1);
}
}
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