DoWrap.java

/***************************************************************************
   Copyright 2012 Emily Estes

   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 net.metanotion.sqlc;


import java.sql.Connection;
import java.util.List;
import java.util.Map;

/** This evaluator takes a list of body expressions and performs them sequentially and returns the result of the last
expression.
	@param <V> The type of the result of the expression.
*/
public final class DoWrap<V> implements QueryExpr<V> {
	public final List<QueryExpr<V>> exprs;
	/** Create a new evaluator that evaluates the list of expressions.
		@param body The list of expressions to evaluate.
	*/
	public DoWrap(final List<QueryExpr<V>> body) { this.exprs = body; }

	@Override public V eval(final Connection conn, final Map<String,Object> env) throws Exception {
		V ret = null;
		for(final QueryExpr<V> e: exprs) { ret = e.eval(conn, env); }
		return ret;
	}
}