#region License

/*
 * Copyright © 2002-2009 the original author or authors.
 *
 * 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.
 */

#endregion

using System;
using System.Runtime.Serialization;

namespace Spring.Expressions
{
    /// <summary>
    /// Base class for binary operators.
    /// </summary>
    /// <author>Aleksandar Seovic</author>
    [Serializable]
    public abstract class BinaryOperator : BaseNode
    {
        /// <summary>
        /// Create a new instance
        /// </summary>
        protected BinaryOperator()
        {}

        /// <summary>
        /// Create a new instance with the supplied operands
        /// </summary>
        /// <param name="left"></param>
        /// <param name="right"></param>
        protected BinaryOperator(BaseNode left, BaseNode right)
        {
            base.addChild(left);
            base.addChild(right);
        }

        /// <summary>
        /// Create a new instance from SerializationInfo
        /// </summary>
        protected BinaryOperator(SerializationInfo info, StreamingContext context)
            : base(info, context)
        {}
        
        /// <summary>
        /// Gets the left operand.
        /// </summary>
        /// <value>The left operand.</value>
        public BaseNode Left
        {
            get { return (BaseNode) this.getFirstChild(); }
        }

        /// <summary>
        /// Gets the right operand.
        /// </summary>
        /// <value>The right operand.</value>
        public BaseNode Right
        {
            get { return (BaseNode) this.getFirstChild().getNextSibling(); }
        }
    }
}