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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.expressions;
import com.yahoo.document.DataType;
import com.yahoo.document.datatypes.IntegerFieldValue;
import java.util.Objects;
import java.util.concurrent.ThreadLocalRandom;
/**
* @author Simon Thoresen Hult
*/
public final class RandomExpression extends Expression {
private final Integer max;
public RandomExpression() {
this(null);
}
public RandomExpression(Integer max) {
super(null);
this.max = max;
}
public Integer getMaxValue() {
return max;
}
@Override
protected void doExecute(ExecutionContext context) {
int max;
max = Objects.requireNonNullElseGet(this.max, () -> Integer.parseInt(String.valueOf(context.getValue())));
context.setValue(new IntegerFieldValue(ThreadLocalRandom.current().nextInt(max)));
}
@Override
protected void doVerify(VerificationContext context) {
context.setValueType(createdOutputType());
}
@Override
public DataType createdOutputType() {
return DataType.INT;
}
@Override
public String toString() {
return "random" + (max != null ? " " + max : "");
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof RandomExpression rhs)) return false;
if (!equals(max, rhs.max)) return false;
return true;
}
@Override
public int hashCode() {
return getClass().hashCode();
}
}
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