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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.config.model;
import com.yahoo.config.model.builder.xml.ConfigModelBuilder;
import com.yahoo.config.model.builder.xml.ConfigModelId;
import java.util.Collection;
import java.util.Collections;
/**
* A resolver of implementations of named config models.
* Registries may be chained in a chain of command.
*
* @author bratseth
*/
public abstract class ConfigModelRegistry {
private final ConfigModelRegistry chained;
public ConfigModelRegistry() {
this(new EmptyTerminalRegistry());
}
/** Creates a config model class registry which forwards unresolved requests to the argument instance */
public ConfigModelRegistry(ConfigModelRegistry chained) {
this.chained=chained;
}
/**
* Returns the builders this id resolves to both in this and any chained registry.
*
* @return the resolved config model builders, or an empty list (never null) if none
*/
public abstract Collection<ConfigModelBuilder> resolve(ConfigModelId id);
public ConfigModelRegistry chained() { return chained; }
/** An empty registry which does not support chaining */
private static class EmptyTerminalRegistry extends ConfigModelRegistry {
public EmptyTerminalRegistry() {
super(null);
}
@Override
public Collection<ConfigModelBuilder> resolve(ConfigModelId id) {
return Collections.emptyList();
}
}
}
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