| /* |
| * 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.poi.util; |
| |
| import java.util.List; |
| import java.util.ArrayList; |
| |
| /** |
| * Provides an interface for interacting with 2d arrays of objects. This |
| * implementation will return null for items not yet allocated and automatically |
| * increase the array size for set operations. You never get an index out of |
| * bounds. |
| * |
| * @author Glen Stampoultzis (glens at apache.org) |
| * @version $Id$ |
| */ |
| public class List2d |
| { |
| // Implemented using a List of List's. |
| List rows = new ArrayList(); |
| |
| public Object get(int col, int row) |
| { |
| if (row >= rows.size()) |
| { |
| return null; |
| } |
| else |
| { |
| List cols = (List) rows.get(row); |
| if (col >= cols.size()) |
| return null; |
| else |
| return cols.get( col ); |
| } |
| } |
| |
| public void set(int col, int row, Object value) |
| { |
| resizeRows(row); |
| resizeCols(row,col); |
| List cols = (List) rows.get( row ); |
| cols.set( col, value ); |
| } |
| |
| private void resizeRows( int row ) |
| { |
| while (rows.size() <= row) |
| rows.add( new ArrayList() ); |
| } |
| |
| private void resizeCols( int row, int col ) |
| { |
| List cols = (List) rows.get( row ); |
| while (cols.size() <= col) |
| cols.add(null); |
| } |
| |
| |
| } |