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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.vespa.indexinglanguage;
import com.yahoo.collections.Pair;
import com.yahoo.vespa.indexinglanguage.expressions.*;
import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
/**
* @author Simon Thoresen Hult
*/
@SuppressWarnings({ "UnusedDeclaration" })
public abstract class ExpressionConverter implements Cloneable {
public final Expression convert(Expression exp) {
if (exp == null) {
return null;
}
if (shouldConvert(exp)) {
return doConvert(exp);
}
if (!(exp instanceof CompositeExpression)) {
return exp;
}
try {
// The class.getMethod here takes 8% of the cpu time in reading the SSBE application package
// TODO: Implement double dispatch through visitor instead?
return (Expression)ExpressionConverter.class.getMethod("innerConvert", exp.getClass()).invoke(this, exp);
} catch (IllegalAccessException | NoSuchMethodException e) {
throw new UnsupportedOperationException(exp.getClass().getName(), e);
} catch (InvocationTargetException e) {
Throwable t = e.getTargetException();
throw t instanceof RuntimeException ? (RuntimeException)t : new RuntimeException(t);
}
}
public Expression innerConvert(ArithmeticExpression exp) {
return new ArithmeticExpression(convert(exp.getLeftHandSide()),
exp.getOperator(),
convert(exp.getRightHandSide()));
}
public Expression innerConvert(CatExpression exp) {
List<Expression> lst = new LinkedList<>();
for (Expression innerExp : exp) {
Expression next = convert(innerExp);
if (next != null) {
lst.add(next);
}
}
return new CatExpression(lst);
}
public Expression innerConvert(ChoiceExpression exp) {
var convertedInnerExpressions = exp.asList().stream().map(inner -> convert(inner)).toList();
return new ChoiceExpression(convertedInnerExpressions);
}
public Expression innerConvert(ForEachExpression exp) {
return new ForEachExpression(convert(exp.getInnerExpression()));
}
public Expression innerConvert(GuardExpression exp) {
return new GuardExpression(convert(exp.getInnerExpression()));
}
public Expression innerConvert(IfThenExpression exp) {
return new IfThenExpression(branch().convert(exp.getLeftHandSide()),
exp.getComparator(),
branch().convert(exp.getRightHandSide()),
branch().convert(exp.getIfTrueExpression()),
branch().convert(exp.getIfFalseExpression()));
}
public Expression innerConvert(ParenthesisExpression exp) {
return new ParenthesisExpression(convert(exp.getInnerExpression()));
}
public Expression innerConvert(ScriptExpression exp) {
List<StatementExpression> lst = new LinkedList<>();
for (Expression innerExp : exp) {
StatementExpression next = (StatementExpression)branch().convert(innerExp);
if (next != null) {
lst.add(next);
}
}
return new ScriptExpression(lst);
}
public Expression innerConvert(SelectInputExpression exp) {
List<Pair<String, Expression>> cases = new LinkedList<>();
for (Pair<String, Expression> pair : exp.getCases()) {
cases.add(new Pair<>(pair.getFirst(), branch().convert(pair.getSecond())));
}
return new SelectInputExpression(cases);
}
public Expression innerConvert(StatementExpression exp) {
List<Expression> lst = new LinkedList<>();
for (Expression innerExp : exp) {
Expression next = convert(innerExp);
if (next != null) {
lst.add(next);
}
}
return new StatementExpression(lst);
}
public Expression innerConvert(SwitchExpression exp) {
Map<String, Expression> cases = new HashMap<>();
for (Map.Entry<String, Expression> entry : exp.getCases().entrySet()) {
Expression next = branch().convert(entry.getValue());
if (next != null) {
cases.put(entry.getKey(), next);
}
}
return new SwitchExpression(cases, branch().convert(exp.getDefaultExpression()));
}
protected ExpressionConverter branch() {
return this;
}
@Override
public ExpressionConverter clone() {
try {
return (ExpressionConverter)super.clone();
} catch (CloneNotSupportedException e) {
throw new UnsupportedOperationException(e);
}
}
protected abstract boolean shouldConvert(Expression exp);
protected abstract Expression doConvert(Expression exp);
}
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