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/*
* 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 integers. This
* implementation will return 0 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 IntList2d
{
// Implemented using a List of IntList's.
List rows = new ArrayList();
public int get(int col, int row)
{
if (row >= rows.size())
{
return 0;
}
else
{
IntList cols = (IntList) rows.get(row);
if (col >= cols.size())
return 0;
else
return cols.get( col );
}
}
public void set(int col, int row, int value)
{
resizeRows(row);
resizeCols(row,col);
IntList cols = (IntList) rows.get( row );
cols.set( col, value );
}
private void resizeRows( int row )
{
while (rows.size() <= row)
rows.add( new IntList() );
}
private void resizeCols( int row, int col )
{
IntList cols = (IntList) rows.get( row );
while (cols.size() <= col)
cols.add(0);
}
public boolean isAllocated( int col, int row )
{
if (row < rows.size())
{
IntList cols = (IntList) rows.get( row );
return ( col < cols.size() );
}
else
{
return false;
}
}
}
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