1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package org.apache.commons.flatfile; 18 19 /** 20 * EntityCollection whose children are indexed. 21 * @version $Revision: 758023 $ $Date: 2009-03-24 16:09:19 -0500 (Tue, 24 Mar 2009) $ 22 */ 23 public interface IndexedEntityCollection extends EntityCollection { 24 /** 25 * Get the size (# of child elements) of this IndexedEntityCollection. 26 * @return int 27 */ 28 int size(); 29 30 /** 31 * Get the child at the specified index. 32 * @param index int 33 * @return Entity 34 */ 35 Entity getChild(int index); 36 37 /** 38 * Learn whether the size of this object can be set. 39 * @return boolean 40 */ 41 boolean isSizable(); 42 43 /** 44 * Set new size of this object. 45 * @param size to set 46 * @throws IllegalStateException if {@link #isSizable()} <code>== false</code> 47 */ 48 void setSize(int size) throws IllegalStateException; 49 }