SignedNumericLiteralParser.java

/*
 * Copyright 2010 NCHOVY
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.krakenapps.sqlparser.parser;

import org.krakenapps.bnf.Binding;
import org.krakenapps.bnf.Parser;

public class SignedNumericLiteralParser implements Parser {

	@Override
	public Object parse(Binding b) {
		if (b.getChildren() != null) {
			String sign = (String) b.getChildren()[0].getValue();
			Number value = (Number) b.getChildren()[1].getValue();
			if (sign.equals("-")) {
				if (value instanceof Integer) {
					return -((Integer) value);
				} else if (value instanceof Double) {
					return -((Double) value);
				}
				
				throw new UnsupportedOperationException();
			}

			return value;
		} else {
			return b.getValue();
		}
	}
}