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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.searchlib.rankingexpression.rule;
import com.yahoo.searchlib.rankingexpression.ExpressionFunction;
import com.yahoo.searchlib.rankingexpression.RankingExpression;
import com.yahoo.searchlib.rankingexpression.Reference;
import com.yahoo.tensor.TensorType;
import com.yahoo.tensor.evaluation.TypeContext;
import static com.yahoo.searchlib.rankingexpression.Reference.wrapInRankingExpression;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Optional;
/**
* Context needed to serialize an expression to a string. This has the lifetime of a single serialization
*
* @author bratseth
*/
public class SerializationContext extends FunctionReferenceContext {
/** Serialized form of functions indexed by name */
private final Map<String, String> serializedFunctions;
private final Optional<TypeContext<Reference>> typeContext;
/** Create a context for a single serialization task */
public SerializationContext() {
this(Collections.emptyList(), Collections.emptyMap(), Optional.empty(), new LinkedHashMap<>());
}
/**
* Create a context for a single serialization task
*
* @param functions the functions of this
* @param typeContext the type context of this: Serialization may depend on type resolution
*/
public SerializationContext(Collection<ExpressionFunction> functions,
Optional<TypeContext<Reference>> typeContext) {
this(functions, Collections.emptyMap(), typeContext, new LinkedHashMap<>());
}
/**
* Create a context for a single serialization task
*
* @param functions the functions of this
* @param bindings the arguments of this
* @param typeContext the type context of this: Serialization may depend on type resolution
*/
public SerializationContext(Collection<ExpressionFunction> functions,
Map<String, String> bindings,
TypeContext<Reference> typeContext) {
this(functions, bindings, Optional.of(typeContext), new LinkedHashMap<>());
}
/**
* Create a context for a single serialization task
*
* @param functions the functions of this
* @param bindings the arguments of this
* @param typeContext the type context of this: Serialization may depend on type resolution
* @param serializedFunctions a cache of serializedFunctions - the ownership of this map
* is <b>transferred</b> to this and will be modified in it
*/
private SerializationContext(Collection<ExpressionFunction> functions,
Map<String, String> bindings,
Optional<TypeContext<Reference>> typeContext,
Map<String, String> serializedFunctions) {
this(toMap(functions), bindings, typeContext, serializedFunctions);
}
public SerializationContext(Map<String, ExpressionFunction> functions,
Map<String, String> bindings,
Optional<TypeContext<Reference>> typeContext,
Map<String, String> serializedFunctions) {
super(functions, bindings);
this.typeContext = typeContext;
this.serializedFunctions = serializedFunctions;
}
/** Returns the type context of this, if it is able to resolve types. */
public Optional<TypeContext<Reference>> typeContext() { return typeContext; }
private static Map<String, ExpressionFunction> toMap(Collection<ExpressionFunction> list) {
Map<String,ExpressionFunction> mapBuilder = new HashMap<>();
for (ExpressionFunction function : list)
mapBuilder.put(function.getName(), function);
return Map.copyOf(mapBuilder);
}
/** Adds the serialization of a function */
public void addFunctionSerialization(String name, String expressionString) {
serializedFunctions.put(name, expressionString);
}
/** Adds the serialization of the argument type to a function */
public void addArgumentTypeSerialization(String functionName, String argumentName, TensorType type) {
serializedFunctions.put(wrapInRankingExpression(functionName) + "." + argumentName + ".type", type.toString());
}
/** Adds the serialization of the return type of a function */
public void addFunctionTypeSerialization(String functionName, TensorType type) {
if (type.rank() == 0) return; // no explicit type implies scalar (aka rank 0 tensor)
String key = wrapInRankingExpression(functionName) + ".type";
var old = serializedFunctions.put(key, type.toString());
if (old != null && !old.equals(type.toString())) {
throw new IllegalArgumentException("conflicting values for " + key + ": " + old + " != " + type.toString());
}
}
@Override
public SerializationContext withBindings(Map<String, String> bindings) {
return new SerializationContext(getFunctions(), bindings, typeContext, this.serializedFunctions);
}
/** Returns a fresh context without bindings */
@Override
public SerializationContext withoutBindings() {
return new SerializationContext(getFunctions(), null, typeContext, this.serializedFunctions);
}
public Map<String, String> serializedFunctions() { return serializedFunctions; }
public boolean needSerialization(String functionName) {
return ! serializedFunctions().containsKey(RankingExpression.propertyName(functionName));
}
}
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