FromConstructorParser.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 java.util.List;

import org.krakenapps.bnf.Binding;
import org.krakenapps.bnf.Parser;
import org.krakenapps.sqlparser.ast.FromConstructor;
import org.krakenapps.sqlparser.ast.ValueExpression;

public class FromConstructorParser implements Parser {

	@SuppressWarnings("unchecked")
	@Override
	public Object parse(Binding b) {
		if (b.getChildren() == null) {
			List<ValueExpression> expressions = (List<ValueExpression>) b.getValue();
			return new FromConstructor(expressions);
		} else if (b.getChildren().length == 2) {
			List<String> insertColumns = (List<String>) b.getChildren()[0].getChildren()[1].getValue();
			List<ValueExpression> expressions = (List<ValueExpression>) b.getChildren()[1].getValue();
			return new FromConstructor(insertColumns, expressions);
		}
		
		throw new UnsupportedOperationException();
	}

}