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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.search.query.properties;
import com.yahoo.processing.request.CompoundName;
import com.yahoo.search.query.Properties;
import java.util.Map;
/**
* A properties implementation which translates the incoming name to its standard name
* if it is a registered alias.
* <p>
* Aliases are case insensitive. One standard name may have multiple aliases.
* <p>
* This is multithread safe or not depending on the status of the passed map of aliases.
* Cloning will not deep copy the set of aliases.
*
* @author bratseth
*/
public class PropertyAliases extends Properties {
/** A map from aliases to standard names */
private final Map<String, CompoundName> aliases;
/**
* Creates an instance with a set of aliases. The given aliases will be used directly by this class.
* To make this class immutable and thread safe, relinquish ownership of the parameter map.
*/
public PropertyAliases(Map<String, CompoundName> aliases) {
this.aliases = aliases;
}
/**
* Returns the standard name for an alias, or the given name if it is not a registered alias
*
* @param nameOrAlias the name to check if is an alias
* @return the real name if an alias or the input name itself
*/
protected CompoundName unalias(CompoundName nameOrAlias) {
if (aliases.isEmpty()) return nameOrAlias;
CompoundName properName = aliases.get(nameOrAlias.getLowerCasedName());
return (properName != null) ? properName : nameOrAlias;
}
@Override
public Map<String, Object> listProperties(CompoundName property,
Map<String,String> context,
com.yahoo.processing.request.Properties substitution) {
return super.listProperties(unalias(property), context, substitution);
}
@Override
public Object get(CompoundName name, Map<String,String> context,
com.yahoo.processing.request.Properties substitution) {
return super.get(unalias(name),context,substitution);
}
@Override
public void set(CompoundName name, Object value, Map<String,String> context) {
super.set(unalias(name), value, context);
}
}
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