001    /*
002     * Copyright 2002-2004 the original author or authors.
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License"); you may not
005     * use this file except in compliance with the License. You may obtain a copy of
006     * the License at
007     *
008     * http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
012     * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
013     * License for the specific language governing permissions and limitations under
014     * the License.
015     */
016    package org.springframework.binding.value;
017    
018    /**
019     * Adds an index aspect to the backing object mostly used by collection type
020     * backing objects. The index can be set to point to a specific item which can
021     * be manipulated using get/setValue().
022     */
023    public interface IndexAdapter extends ValueModel {
024    
025            /**
026             * Returns the index of the item which is currently being manipulated.
027             */
028            public int getIndex();
029    
030            /**
031             * Set the index of the item to manipulate.
032             */
033            public void setIndex(int index);
034    
035            /**
036             * Code to be executed when the index has changed.
037             */
038            public void fireIndexedObjectChanged();
039    }