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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.vespa.indexinglanguage;
import com.yahoo.vespa.indexinglanguage.expressions.Expression;
/**
* @author Simon Thoresen Hult
*/
public class ExpressionSearcher<T extends Expression> {
private final Class<T> searchFor;
public ExpressionSearcher(Class<T> searchFor) {
this.searchFor = searchFor;
}
public boolean containedIn(Expression searchIn) {
return searchIn(searchIn) != null;
}
public T searchIn(Expression searchIn) {
MyConverter searcher = new MyConverter();
searcher.convert(searchIn);
return searcher.found;
}
private class MyConverter extends ExpressionConverter {
T found = null;
@Override
protected boolean shouldConvert(Expression exp) {
if (searchFor.isInstance(exp)) {
found = searchFor.cast(exp);
return true; // terminate search
}
return false;
}
@Override
protected Expression doConvert(Expression exp) {
return exp;
}
}
}
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