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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.query.profile;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.yahoo.search.query.profile.types.QueryProfileType;
import java.util.*;
/**
* A variant of a query profile
*
* @author bratseth
*/
public class QueryProfileVariant implements Cloneable, Comparable<QueryProfileVariant> {
private List<QueryProfile> inherited = null;
private final DimensionValues dimensionValues;
private Map<String, Object> values;
private final Map<String, Boolean> overridable = new HashMap<>();
private boolean frozen = false;
private final QueryProfile owner;
public QueryProfileVariant(DimensionValues dimensionValues, QueryProfile owner) {
this.dimensionValues = dimensionValues;
this.owner = owner;
}
public DimensionValues getDimensionValues() { return dimensionValues; }
/**
* Returns the live reference to the values of this. This may be modified
* if this is not frozen.
*/
public Map<String, Object> values() {
if (values == null) {
if (frozen)
return Collections.emptyMap();
else
values = new HashMap<>();
}
return values;
}
/**
* Returns the live reference to the inherited profiles of this. This may be modified
* if this is not frozen.
*/
public List<QueryProfile> inherited() {
if (inherited == null) {
if (frozen)
return Collections.emptyList();
else
inherited = new ArrayList<>();
}
return inherited;
}
public Object set(String key, Object newValue) {
if (values == null)
values = new HashMap<>();
Object oldValue = values.get(key);
Object combinedOrNull = QueryProfile.combineValues(newValue, oldValue);
if (combinedOrNull instanceof BackedOverridableQueryProfile) // Use the owner's, not the referenced dimensions
((QueryProfile) combinedOrNull).setDimensions(owner.getDimensions().toArray(new String[0]));
if (combinedOrNull != null)
values.put(key, combinedOrNull);
return combinedOrNull;
}
public void setOverridable(String key, boolean overridable) {
this.overridable.put(key, overridable);
}
public Boolean isOverridable(String key) {
return overridable.get(key);
}
public void inherit(QueryProfile profile) {
if (inherited == null)
inherited = new ArrayList<>(1);
inherited.add(profile);
}
/**
* Implements the sort order of this which is based on specificity
* where dimensions to the left are more significant.
* <p>
* <b>Note:</b> This ordering is not consistent with equals - it returns 0 when the same dimensions
* are <i>set</i>, regardless of what they are set <i>to</i>.
*/
@Override
public int compareTo(QueryProfileVariant other) {
return this.dimensionValues.compareTo(other.dimensionValues);
}
public boolean matches(DimensionValues givenDimensionValues) {
return this.dimensionValues.matches(givenDimensionValues);
}
/** Accepts a visitor to the values of this */
public void accept(boolean allowContent,
QueryProfileType type,
QueryProfileVisitor visitor,
DimensionBinding dimensionBinding) {
// Visit this
if (allowContent) {
String key = visitor.getLocalKey();
if (key != null) {
if (type != null)
type.unalias(key);
visitor.acceptValue(key, values().get(key), dimensionBinding, owner, dimensionValues);
if (visitor.isDone()) return;
}
else {
for (Map.Entry<String, Object> entry : values().entrySet()) {
visitor.acceptValue(entry.getKey(), entry.getValue(), dimensionBinding, owner, dimensionValues);
if (visitor.isDone()) return;
}
}
}
// Visit inherited
for (QueryProfile profile : inherited()) {
if (visitor.visitInherited()) {
profile.accept(allowContent, visitor, dimensionBinding.createFor(profile.getDimensions()), owner);
}
if (visitor.isDone()) return;
}
}
public void freeze() {
if (frozen) return;
if (inherited != null)
inherited = ImmutableList.copyOf(inherited);
if (values != null)
values = ImmutableMap.copyOf(values);
frozen=true;
}
@Override
public QueryProfileVariant clone() {
if (frozen) return this;
try {
QueryProfileVariant clone = (QueryProfileVariant)super.clone();
if (this.inherited != null)
clone.inherited = new ArrayList<>(this.inherited); // TODO: Deep clone is more correct, but probably does not matter in practice
clone.values = CopyOnWriteContent.deepClone(this.values);
return clone;
}
catch (CloneNotSupportedException e) {
throw new RuntimeException(e);
}
}
@Override
public String toString() {
return "query profile variant of " + owner + " for " + dimensionValues;
}
}
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