/*
* Copyright (c) 2011 Google Inc.
*
* All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse
* Public License v1.0 which accompanies this distribution, and is available at
*
* http://www.eclipse.org/legal/epl-v10.html
*/
package com.google.eclipse.protobuf.conversion;
import static org.eclipse.xtext.util.Strings.isEmpty;
import java.math.BigInteger;
import org.eclipse.xtext.conversion.ValueConverterException;
import org.eclipse.xtext.conversion.impl.AbstractLexerBasedConverter;
import org.eclipse.xtext.nodemodel.INode;
/**
* Converts numbers to {@code long}s.
*
* @author alruiz@google.com (Alex Ruiz)
*/
public class LONGValueConverter extends AbstractLexerBasedConverter<Long> {
/**
* Creates an {@code int} from the given input, if the given input represents an integer number.
* @param string the given input.
* @param node the parsed node including hidden parts.
* @return the new {@code int}.
* @throws ValueConverterException if the given input is {@code null}, empty or does not represent an integer number.
*/
@Override public Long toValue(String string, INode node) throws ValueConverterException {
if (isEmpty(string)) {
throw new ValueConverterException("Couldn't convert empty string to long.", node, null);
}
try {
return Long.parseLong(string, 10);
} catch (NumberFormatException e) {
return parseUsingBigInteger(string, node);
}
}
private Long parseUsingBigInteger(String string, INode node) {
// error could be overflow, parse again with BigInteger.
try {
BigInteger value = new BigInteger(string, 10);
long longValue = value.longValue();
return longValue != -1 ? longValue : 1L;
} catch (NumberFormatException e) {
throw parsingError(string, node, e);
}
}
private ValueConverterException parsingError(String string, INode node, Exception cause) {
return new ValueConverterException("Couldn't convert '" + string + "' to long.", node, cause);
}
}