/*
 * Copyright 2004-2011 H2 Group.
 * Copyright 2011 James Moger.
 *
 * 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 com.iciql;

/**
 * This class represents "SET column = (column + x)" in an UPDATE statement.
 * 
 * @param <T>
 *            the query type
 * @param <A>
 *            the new value data type
 */

public class UpdateColumnIncrement<T, A> implements UpdateColumn {

	private Query<T> query;
	private A x;
	private A y;

	UpdateColumnIncrement(Query<T> query, A x) {
		this.query = query;
		this.x = x;
	}

	public Query<T> by(A y) {
		query.addUpdateColumnDeclaration(this);
		this.y = y;
		return query;
	}

	public void appendSQL(SQLStatement stat) {
		query.appendSQL(stat, null, x);
		stat.appendSQL("=(");
		query.appendSQL(stat, null, x);
		stat.appendSQL("+");
		query.appendSQL(stat, x, y);
		stat.appendSQL(")");
	}

}