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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.searchlib.rankingexpression.rule;
import com.google.common.collect.ImmutableMap;
import com.yahoo.searchlib.rankingexpression.ExpressionFunction;
import com.yahoo.tensor.TensorType;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* 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;
/** Create a context for a single serialization task */
public SerializationContext() {
this(Collections.emptyList());
}
/** Create a context for a single serialization task */
public SerializationContext(Collection<ExpressionFunction> functions) {
this(functions, Collections.emptyMap(), new LinkedHashMap<>());
}
/** Create a context for a single serialization task */
public SerializationContext(Map<String, ExpressionFunction> functions) {
this(functions.values());
}
/** Create a context for a single serialization task */
public SerializationContext(Collection<ExpressionFunction> functions, Map<String, String> bindings) {
this(functions, bindings, new LinkedHashMap<>());
}
/**
* Create a context for a single serialization task
*
* @param functions the functions of this
* @param bindings the arguments of this
* @param serializedFunctions a cache of serializedFunctions - the ownership of this map
* is <b>transferred</b> to this and will be modified in it
*/
public SerializationContext(Collection<ExpressionFunction> functions, Map<String, String> bindings,
Map<String, String> serializedFunctions) {
this(toMap(functions), bindings, serializedFunctions, null);
}
private static ImmutableMap<String, ExpressionFunction> toMap(Collection<ExpressionFunction> list) {
ImmutableMap.Builder<String,ExpressionFunction> mapBuilder = new ImmutableMap.Builder<>();
for (ExpressionFunction function : list)
mapBuilder.put(function.getName(), function);
return mapBuilder.build();
}
/**
* Create a context for a single serialization task
*
* @param functions the functions of this
* @param bindings the arguments of this
* @param serializedFunctions a cache of serializedFunctions - the ownership of this map
* is <b>transferred</b> to this and will be modified in it
*/
public SerializationContext(ImmutableMap<String,ExpressionFunction> functions, Map<String, String> bindings,
Map<String, String> serializedFunctions, FunctionReferenceContext root) {
super(functions, bindings, root);
this.serializedFunctions = serializedFunctions;
}
/** Adds the serialization of a function */
public void addFunctionSerialization(String name, String expressionString) {
serializedFunctions.put(name, expressionString);
}
/** Adds the serialization of the an argument type to a function */
public void addArgumentTypeSerialization(String functionName, String argumentName, TensorType type) {
serializedFunctions.put("rankingExpression(" + 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)
serializedFunctions.put("rankingExpression(" + functionName + ").type", type.toString());
}
@Override
public SerializationContext withBindings(Map<String, String> bindings) {
return new SerializationContext(functions(), bindings, this.serializedFunctions, this);
}
public Map<String, String> serializedFunctions() { return serializedFunctions; }
}
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