1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
// 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 Hult
*/
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 StringBuilder(), new SerializationContext(), null, null).toString();
}
/**
* Returns a script instance of this based on the supplied script functions.
*
* @param builder the StringBuilder that will be appended to
* @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 StringBuilder toString(StringBuilder builder, SerializationContext context, Deque<String> path, CompositeNode parent);
/**
* Returns a script instance of this based on the supplied script functions.
* @deprecated use the faster one that takes and returns a StringBuilder instead.
*
* @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.
*/
@Deprecated
public String toString(SerializationContext context, Deque<String> path, CompositeNode parent) {
return toString(new StringBuilder(), context, path, parent).toString();
}
/**
* 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);
}
|
