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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.yahoo.searchlib.rankingexpression.Reference;
import com.yahoo.searchlib.rankingexpression.evaluation.Context;
import com.yahoo.searchlib.rankingexpression.evaluation.Value;
import com.yahoo.tensor.TensorType;
import com.yahoo.tensor.evaluation.TypeContext;
import java.io.Serializable;
import java.util.Deque;
/**
* Superclass of all expression nodes. Expression nodes have their identity determined by their content.
* All expression nodes are immutable.
*
* @author Simon Thoresen
*/
public abstract class ExpressionNode implements Serializable {
@Override
public final int hashCode() {
return toString().hashCode();
}
@Override
public final boolean equals(Object obj) {
return obj instanceof ExpressionNode && toString().equals(obj.toString());
}
@Override
public final String toString() {
return toString(new SerializationContext(), null, null);
}
/**
* Returns a script instance of this based on the supplied script functions.
*
* @param context the serialization context
* @param path the call path to this, used for cycle detection, or null if this is a root
* @param parent the parent node of this, or null if it a root
* @return the main script, referring to script instances.
*/
public abstract String toString(SerializationContext context, Deque<String> path, CompositeNode parent);
/**
* Returns the type this will return if evaluated with the given context.
*
* @param context the variable type bindings to use for this evaluation
* @throws IllegalArgumentException if there are variables which are not bound in the given map
*/
public abstract TensorType type(TypeContext<Reference> context);
/**
* Returns the value of evaluating this expression over the given context.
*
* @param context the variable bindings to use for this evaluation
* @throws IllegalArgumentException if there are variables which are not bound in the given map
*/
public abstract Value evaluate(Context context);
}
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