DoubleArray.java

/*
 * Copyright (c) 2003-2012 Fred Hutchinson Cancer Research Center
 *
 * Licensed 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.fhcrc.cpl.toolbox.datastructure;

import java.util.ArrayList;


/**
 * User: mbellew
 * Date: May 24, 2004
 * Time: 9:09:24 PM
 */
// alternative to ArrayList<Double>
public class DoubleArray
    {
    private static final int ARRAY_LEN = 1024;
    ArrayList list = new ArrayList();
    double[] arrayLast;
    int lenLast = 0;
    int size = 0;


    public DoubleArray()
        {
        list = new ArrayList();
        arrayLast = new double[ARRAY_LEN];
        list.add(arrayLast);
        }


    public void add(double d)
        {
        if (arrayLast.length <= lenLast)
            {
            arrayLast = new double[ARRAY_LEN];
            list.add(arrayLast);
            lenLast = 0;
            }
        arrayLast[lenLast++] = d;
        size++;
        }


    public double get(int i)
        {
        return ((double[]) list.get(i / ARRAY_LEN))[i % ARRAY_LEN];
        }


    public int size()
        {
        return size;
        }


	public double[] toArray(double[] dst)
		{
    	if (null == dst || dst.length < size)
			dst = new double[size];
		int end=0, i=0;
		double[] src;
		for (; i<list.size()-1 ; i++)
			{
			src = (double[])list.get(i);
			System.arraycopy(src, 0, dst, end, src.length);
			end += src.length;
			}
		src = (double[])list.get(i);
		System.arraycopy(src, 0, dst, end, lenLast);
		return dst;
		}
    }