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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.compiled;
import com.google.common.collect.ImmutableMap;
import com.yahoo.processing.request.CompoundName;
import com.yahoo.search.query.profile.DimensionBinding;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
/**
* A map which may return different values depending on the values given in a context
* supplied with the key on all operations.
* <p>
* Dimensional maps are immutable and created through a DimensionalMap.Builder
*
* @author bratseth
*/
public class DimensionalMap<VALUE> {
private final Map<CompoundName, DimensionalValue<VALUE>> values;
private DimensionalMap(Map<CompoundName, DimensionalValue<VALUE>> values) {
this.values = ImmutableMap.copyOf(values);
}
/** Returns the value for this key matching a context, or null if none */
public VALUE get(CompoundName key, Map<String, String> context) {
DimensionalValue<VALUE> variants = values.get(key);
if (variants == null) return null;
return variants.get(context);
}
/** Returns the set of dimensional entries across all contexts. */
public Set<Map.Entry<CompoundName, DimensionalValue<VALUE>>> entrySet() {
return values.entrySet();
}
/** Returns true if this is empty for all contexts. */
public boolean isEmpty() {
return values.isEmpty();
}
public static class Builder<VALUE> {
private final Map<CompoundName, DimensionalValue.Builder<VALUE>> entries = new HashMap<>();
public void put(CompoundName key, Binding binding, VALUE value) {
entries.computeIfAbsent(key, __ -> new DimensionalValue.Builder<>())
.add(value, binding);
}
public DimensionalMap<VALUE> build() {
Map<CompoundName, DimensionalValue<VALUE>> map = new HashMap<>();
for (Map.Entry<CompoundName, DimensionalValue.Builder<VALUE>> entry : entries.entrySet()) {
map.put(entry.getKey(), entry.getValue().build(entries));
}
return new DimensionalMap<>(map);
}
}
}
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