/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.apache.olingo.server.api.uri.queryoption.expression;

/**
 * Represents a unary expression node in the expression tree
 * <br>
 * A binary expression node is inserted in the expression tree for any valid
 * ODATA unary operator in {@link UnaryOperatorKind}
 */
public interface Unary extends Expression {

  /**
   * @return The used binary operator
   * @see UnaryOperatorKind
   */
  public Expression getOperand();

  /**
   * @return Expression sub tree to which the operator applies
   */
  public UnaryOperatorKind getOperator();

}