001/* 002// $Id: QueryNodeListener.java 482 2012-01-05 23:27:27Z jhyde $ 003// 004// Licensed to Julian Hyde under one or more contributor license 005// agreements. See the NOTICE file distributed with this work for 006// additional information regarding copyright ownership. 007// 008// Julian Hyde licenses this file to you under the Apache License, 009// Version 2.0 (the "License"); you may not use this file except in 010// compliance with the License. You may obtain a copy of the License at: 011// 012// http://www.apache.org/licenses/LICENSE-2.0 013// 014// Unless required by applicable law or agreed to in writing, software 015// distributed under the License is distributed on an "AS IS" BASIS, 016// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 017// See the License for the specific language governing permissions and 018// limitations under the License. 019*/ 020package org.olap4j.query; 021 022/** 023 * Objects that want to be notified of changes to the Query Model structure 024 * have to implement this interface. 025 * 026 * @author Luc Boudreau 027 * @version $Id: QueryNodeListener.java 482 2012-01-05 23:27:27Z jhyde $ 028 */ 029public interface QueryNodeListener { 030 /** 031 * Invoked when one or more children of a QueryNode are removed 032 * from its list. 033 * 034 * @param event Describes in detail the actual event that just happened. 035 */ 036 public void childrenRemoved(QueryEvent event); 037 038 /** 039 * Invoked when one or more children are added to a QueryNode 040 * list of children. 041 * 042 * @param event Describes in detail the actual event that just happened. 043 */ 044 public void childrenAdded(QueryEvent event); 045 046 /** 047 * Invoked when a selection operator has changed. This does not mean 048 * that a Selection object was either added or removed from a Dimension, 049 * it only means that its operator value was modified. 050 * 051 * @param event Describes in detail the actual event that just happened. 052 * @see org.olap4j.query.Selection 053 **/ 054 public void selectionChanged(QueryEvent event); 055} 056 057// End QueryNodeListener.java