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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.indexinglanguage.expressions;
import com.yahoo.document.DataType;
import com.yahoo.document.datatypes.IntegerFieldValue;
import com.yahoo.document.datatypes.LongFieldValue;
import com.yahoo.document.datatypes.PredicateFieldValue;
import com.yahoo.document.predicate.Predicate;
import com.yahoo.search.predicate.optimization.AndOrSimplifier;
import com.yahoo.search.predicate.optimization.BooleanSimplifier;
import com.yahoo.search.predicate.optimization.ComplexNodeTransformer;
import com.yahoo.search.predicate.optimization.NotNodeReorderer;
import com.yahoo.search.predicate.optimization.PredicateOptions;
import com.yahoo.search.predicate.optimization.PredicateProcessor;
/**
* @author Simon Thoresen Hult
*/
public final class OptimizePredicateExpression extends Expression {
private final PredicateProcessor optimizer;
public OptimizePredicateExpression() {
this(new PredicateOptimizer());
}
OptimizePredicateExpression(PredicateProcessor optimizer) {
super(DataType.PREDICATE);
this.optimizer = optimizer;
}
@Override
protected void doExecute(ExecutionContext context) {
PredicateFieldValue predicate = ((PredicateFieldValue) context.getValue()).clone();
IntegerFieldValue arity = (IntegerFieldValue) context.getVariable("arity");
LongFieldValue lower_bound = (LongFieldValue) context.getVariable("lower_bound");
LongFieldValue upper_bound = (LongFieldValue) context.getVariable("upper_bound");
Long lower = lower_bound != null? lower_bound.getLong() : null;
Long upper = upper_bound != null? upper_bound.getLong() : null;
PredicateOptions options = new PredicateOptions(arity.getInteger(), lower, upper);
predicate.setPredicate(optimizer.process(predicate.getPredicate(), options));
context.setValue(predicate);
}
@Override
protected void doVerify(VerificationContext context) {
checkVariable(context, "arity", DataType.INT, true);
checkVariable(context, "lower_bound", DataType.LONG, false);
checkVariable(context, "upper_bound", DataType.LONG, false);
context.setValueType(DataType.PREDICATE);
}
private void checkVariable(VerificationContext ctx, String var, DataType type, boolean required) {
DataType input = ctx.getVariable(var);
if (input == null) {
if (required) {
throw new VerificationException(this, "Variable '" + var + "' must be set");
}
} else if (input != type) {
throw new VerificationException(this, "Variable '" + var + "' must have type " + type.getName());
}
}
@Override
public DataType createdOutputType() {
return null;
}
@Override
public String toString() {
return "optimize_predicate";
}
@Override
public int hashCode() {
return getClass().hashCode();
}
@Override
public boolean equals(Object obj) {
return obj instanceof OptimizePredicateExpression;
}
private static class PredicateOptimizer implements PredicateProcessor {
private final ComplexNodeTransformer complexNodeTransformer = new ComplexNodeTransformer();
private final BooleanSimplifier booleanSimplifier = new BooleanSimplifier();
private final AndOrSimplifier andOrSimplifier = new AndOrSimplifier();
private final NotNodeReorderer notNodeReorderer = new NotNodeReorderer();
@Override
public Predicate process(Predicate predicate, PredicateOptions options) {
Predicate processedPredicate = complexNodeTransformer.process(predicate, options);
processedPredicate = booleanSimplifier.process(processedPredicate, options);
processedPredicate = andOrSimplifier.process(processedPredicate, options);
return notNodeReorderer.process(processedPredicate, options);
}
}
}
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