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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.profile;
import java.util.List;
/**
* Visitor which stores the first non-query-profile value encountered,
* or the first query profile encountered at a stop where we do not have any name components left which can be used to
* visit further subprofiles. Hence this may be used both to get the highest prioritized primitive
* value, or query profile, whichever is encountered first which matches the name.
* <p>
*
* @author bratseth
*/
final class SingleValueQueryProfileVisitor extends QueryProfileVisitor {
/** The value found, or null if none */
private Object value=null;
private final List<String> name;
private int nameIndex=-1;
private final boolean allowQueryProfileResult;
private boolean enteringContent=true;
public SingleValueQueryProfileVisitor(List<String> name,boolean allowQueryProfileResult) {
this.name=name;
this.allowQueryProfileResult=allowQueryProfileResult;
}
@Override
public String getLocalKey() {
return name.get(nameIndex);
}
@Override
public boolean enter(String name) {
if (nameIndex+1<this.name.size()) {
nameIndex++;
enteringContent=true;
}
else {
enteringContent=false;
}
return enteringContent;
}
@Override
public void leave(String name) {
nameIndex--;
}
@Override
public void onValue(String key,Object value, DimensionBinding binding, QueryProfile owner) {
if (nameIndex==name.size()-1)
this.value=value;
}
@Override
public void onQueryProfile(QueryProfile profile,DimensionBinding binding, QueryProfile owner) {
if (enteringContent) return; // still waiting for content
if (allowQueryProfileResult)
this.value = profile;
else
this.value = profile.getValue();
}
@Override
public boolean isDone() {
return value!=null;
}
/** Returns the value found during visiting, or null if none */
public Object getResult() { return value; }
@Override
public String toString() {
return "a single value visitor (hash " + hashCode() + ") with current value " + value;
}
}
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