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MathFunction.java
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MathFunction.java
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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License;
* you may not use this file except in compliance with the Elastic License.
*/
package org.elasticsearch.xpack.sql.expression.function.scalar.math;
import org.elasticsearch.xpack.sql.expression.Expression;
import org.elasticsearch.xpack.sql.expression.Expressions;
import org.elasticsearch.xpack.sql.expression.Expressions.ParamOrdinal;
import org.elasticsearch.xpack.sql.expression.function.scalar.UnaryScalarFunction;
import org.elasticsearch.xpack.sql.expression.function.scalar.math.MathProcessor.MathOperation;
import org.elasticsearch.xpack.sql.expression.gen.processor.Processor;
import org.elasticsearch.xpack.sql.tree.Location;
import org.elasticsearch.xpack.sql.type.DataType;
import java.util.Locale;
import java.util.Objects;
import static java.lang.String.format;
public abstract class MathFunction extends UnaryScalarFunction {
protected MathFunction(Location location) {
super(location);
}
protected MathFunction(Location location, Expression field) {
super(location, field);
}
@Override
public boolean foldable() {
return field().foldable();
}
@Override
public Object fold() {
return operation().apply(field().fold());
}
@Override
public String processScript(String template) {
return super.processScript(format(Locale.ROOT, "{sql}.%s(%s)", mathFunction(), template));
}
protected String mathFunction() {
return getClass().getSimpleName().toLowerCase(Locale.ROOT);
}
@Override
public DataType dataType() {
return DataType.DOUBLE;
}
@Override
protected TypeResolution resolveType() {
if (!childrenResolved()) {
return new TypeResolution("Unresolved children");
}
return Expressions.typeMustBeNumeric(field(), operation().toString(), ParamOrdinal.DEFAULT);
}
@Override
protected Processor makeProcessor() {
return new MathProcessor(operation());
}
protected abstract MathOperation operation();
@Override
public boolean equals(Object obj) {
if (obj == null || obj.getClass() != getClass()) {
return false;
}
MathFunction other = (MathFunction) obj;
return Objects.equals(other.field(), field());
}
@Override
public int hashCode() {
return Objects.hash(field());
}
}