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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.LongFieldValue;
import java.math.BigInteger;
/**
* @author Simon Thoresen Hult
*/
public final class HexDecodeExpression extends Expression {
private static final BigInteger ULONG_MAX = new BigInteger("18446744073709551616");
public HexDecodeExpression() {
super(DataType.STRING);
}
@Override
protected void doExecute(ExecutionContext context) {
String input = String.valueOf(context.getValue());
if (input.isEmpty()) {
context.setValue(new LongFieldValue(Long.MIN_VALUE));
return;
}
BigInteger output;
try {
output = new BigInteger(input, 16);
} catch (NumberFormatException e) {
throw new NumberFormatException("Illegal hex value '" + input + "'");
}
if (output.bitLength() > 64) {
throw new NumberFormatException("Hex value '" + input + "' is out of range");
}
if (output.compareTo(BigInteger.ZERO) > 0 && output.bitLength() == 64) {
output = output.subtract(ULONG_MAX); // flip to negative
}
context.setValue(new LongFieldValue(output.longValue()));
}
@Override
protected void doVerify(VerificationContext context) {
context.setValueType(createdOutputType());
}
@Override
public DataType createdOutputType() {
return DataType.LONG;
}
@Override
public String toString() {
return "hexdecode";
}
@Override
public boolean equals(Object obj) {
return obj instanceof HexDecodeExpression;
}
@Override
public int hashCode() {
return getClass().hashCode();
}
}
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