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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.searchlib.rankingexpression.rule;
import com.yahoo.searchlib.rankingexpression.ExpressionFunction;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
/**
* The context of a function invocation.
*
* @author bratseth
*/
public class FunctionReferenceContext {
/** Expression functions indexed by name */
private final Map<String, ExpressionFunction> functions;
/** Mapping from argument names to the expressions they resolve to */
private final Map<String, String> bindings = new HashMap<>();
/** Create a context for a single serialization task */
public FunctionReferenceContext() {
this(Collections.emptyList());
}
/** Create a context for a single serialization task */
public FunctionReferenceContext(Collection<ExpressionFunction> functions) {
this(toMap(functions), Collections.emptyMap());
}
public FunctionReferenceContext(Collection<ExpressionFunction> functions, Map<String, String> bindings) {
this(toMap(functions), bindings);
}
/** Create a context for a single serialization task */
public FunctionReferenceContext(Map<String, ExpressionFunction> functions) {
this(functions, null);
}
/** Create a context for a single serialization task */
public FunctionReferenceContext(Map<String, ExpressionFunction> functions, Map<String, String> bindings) {
this.functions = Map.copyOf(functions);
if (bindings != null)
this.bindings.putAll(bindings);
}
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);
}
/** Returns a function or null if it isn't defined in this context */
public ExpressionFunction getFunction(String name) { return functions.get(name); }
protected Map<String, ExpressionFunction> getFunctions() { return functions; }
/** Returns the resolution of an identifier, or null if it isn't defined in this context */
public String getBinding(String name) { return bindings.get(name); }
/** Returns a new context with the bindings replaced by the given bindings */
public FunctionReferenceContext withBindings(Map<String, String> bindings) {
return new FunctionReferenceContext(this.functions, bindings);
}
/** Returns a fresh context without bindings */
public FunctionReferenceContext withoutBindings() {
return new FunctionReferenceContext(this.functions);
}
}
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