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.support;
017    
018    import org.springframework.binding.value.IndexAdapter;
019    
020    /**
021     * Base implementation of an {@link IndexAdapter} which provides basic index
022     * storing.
023     */
024    public abstract class AbstractIndexAdapter extends AbstractValueModel implements IndexAdapter {
025    
026            private int index;
027    
028            public int getIndex() {
029                    return index;
030            }
031    
032            public void setIndex(int index) {
033                    if (hasChanged(this.index, index)) {
034                            int oldValue = this.index;
035                            this.index = index;
036                            firePropertyChange("index", oldValue, this.index);
037                    }
038            }
039    
040    }