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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.query;
import com.yahoo.search.Query;
/**
* Object properties keyed by name which can be looked up using default values and
* with conversion to various primitive wrapper types.
* <p>
* Multiple property implementations can be chained to provide unified access to properties
* backed by multiple sources as a Chain of Responsibility.
* <p>
* For better performance, prefer CompoundName argument constants over Strings.
* <p>
* Properties can be cloned. Cloning a properties instance returns a new instance
* which chains new instances of all chained instances. The content within each instance
* is cloned to the extent determined appropriate by that implementation.
* <p>
* This base class simply passes all access on to the next in chain.
*
* @author bratseth
*/
public abstract class Properties extends com.yahoo.processing.request.Properties {
@Override
public Properties chained() { return (Properties)super.chained(); }
@Override
public Properties clone() {
return (Properties)super.clone();
}
/** The query owning this property object.
* Only guaranteed to work if this instance is accessible as query.properties()
*/
public Query getParentQuery() {
if (chained() == null) {
throw new RuntimeException("getParentQuery should only be called on a properties instance accessible as query.properties()");
} else {
return chained().getParentQuery();
}
}
/**
* Invoked during deep cloning of the parent query.
*/
public void setParentQuery(Query query) {
if (chained() != null)
chained().setParentQuery(query);
}
}
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