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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.LongFieldValue;
import java.util.Base64;
/**
* @author Simon Thoresen Hult
*/
public final class Base64DecodeExpression extends Expression {
public Base64DecodeExpression() {
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;
}
if (input.length() > 12) {
throw new NumberFormatException("Base64 value '" + input + "' is out of range");
}
byte[] decoded = Base64.getDecoder().decode(input);
if (decoded == null || decoded.length == 0) {
throw new NumberFormatException("Illegal base64 value '" + input + "'");
}
long output = 0;
for (int i = decoded.length; --i >= 0;) {
output = (output << 8) + (((int)decoded[i]) & 0xff);
}
context.setValue(new LongFieldValue(output));
}
@Override
protected void doVerify(VerificationContext context) {
context.setValueType(createdOutputType());
}
@Override
public DataType createdOutputType() {
return DataType.LONG;
}
@Override
public String toString() {
return "base64decode";
}
@Override
public boolean equals(Object obj) {
return obj instanceof Base64DecodeExpression;
}
@Override
public int hashCode() {
return getClass().hashCode();
}
}
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