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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.query.profile;
import com.yahoo.processing.request.CompoundName;
/**
* A query profile visitor which keeps track of name prefixes and can skip values outside a given prefix
*
* @author bratseth
*/
abstract class PrefixQueryProfileVisitor extends QueryProfileVisitor {
/** Only call onValue/onQueryProfile for nodes having this prefix */
private final CompoundName prefix;
/** The current prefix, relative to prefix. */
protected CompoundName currentPrefix = CompoundName.empty;
private int prefixComponentIndex = -1;
public PrefixQueryProfileVisitor(CompoundName prefix) {
if (prefix == null)
prefix = CompoundName.empty;
this.prefix = prefix;
}
@Override
public final void onQueryProfile(QueryProfile profile, DimensionBinding binding, QueryProfile owner) {
if (prefixComponentIndex < prefix.size()) return; // Not in the prefix yet
onQueryProfileInsidePrefix(profile, binding, owner);
}
protected abstract void onQueryProfileInsidePrefix(QueryProfile profile, DimensionBinding binding, QueryProfile owner);
@Override
public final boolean enter(String name) {
prefixComponentIndex++;
if (prefixComponentIndex-1 < prefix.size()) return true; // we're in the given prefix, which should not be included in the name
currentPrefix = currentPrefix.append(name);
return true;
}
@Override
public final void leave(String name) {
prefixComponentIndex--;
if (prefixComponentIndex < prefix.size()) return; // we're in the given prefix, which should not be included in the name
if ( ! name.isEmpty() && ! currentPrefix.isEmpty())
currentPrefix = currentPrefix.first(currentPrefix.size() - 1);
}
/**
* Returns the correct prefix component if we are still going down the prefix path,
* or null to get all if we are inside the prefix
*/
@Override
public String getLocalKey() {
if (prefixComponentIndex < prefix.size())
return prefix.get(prefixComponentIndex);
else
return null;
}
}
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