/*
 * Cobertura - http://cobertura.sourceforge.net/
 *
 * Copyright (C) 2006 Jiri Mares
 *
 * Cobertura is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2 of the License,
 * or (at your option) any later version.
 *
 * Cobertura is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Cobertura; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */

package net.sourceforge.cobertura.coveragedata;

import java.io.Serializable;
import java.util.Arrays;

/**
 * <p>
 * This class implements HasBeenInstrumented so that when cobertura instruments
 * itself, it will omit this class. It does this to avoid an infinite recursion
 * problem because instrumented classes make use of this class.
 * </p>
 */
public class SwitchData implements BranchCoverageData, Comparable, Serializable,
		HasBeenInstrumented
{
	private static final long serialVersionUID = 9;

	private int switchNumber;
	
	private long defaultHits;

	private long[] hits;
	
	private int[] keys;

	public SwitchData(int switchNumber, int[] keys)
	{
		super();
		this.switchNumber = switchNumber;
		defaultHits = 0;
		hits = new long[keys.length];
		Arrays.fill(hits, 0);
		this.keys = new int[keys.length];
		System.arraycopy(keys, 0, this.keys, 0, keys.length);
	}

	public SwitchData(int switchNumber, int min, int max)
	{
		super();
		this.switchNumber = switchNumber;
		defaultHits = 0;
		hits = new long[max - min + 1];
		Arrays.fill(hits, 0);
		this.keys = new int[max - min + 1];
		for (int i = 0; min <= max; keys[i++] = min++);
	}

	public SwitchData(int switchNumber)
	{
		this(switchNumber, new int[0]);
	}

	public int compareTo(Object o)
	{
		if (!o.getClass().equals(SwitchData.class))
			return Integer.MAX_VALUE;
		return this.switchNumber - ((SwitchData) o).switchNumber;
	}
	
	void touchBranch(int branch) 
	{
		if (branch == -1)
			defaultHits++;
		else 
		{
			if (hits.length <= branch)
			{
				long[] old = hits;
				hits = new long[branch + 1];
				System.arraycopy(old, 0, hits, 0, old.length);
				Arrays.fill(hits, old.length, hits.length - 1, 0);
			}
			hits[branch]++;
		}
	}
	
	public int getSwitchNumber()
	{
		return this.switchNumber;
	}

	public long getHits(int branch)
	{
		if (hits.length > branch)
			return hits[branch];
		return -1;
	}

	public long getDefaultHits()
	{
		return defaultHits;
	}

	public double getBranchCoverageRate()
	{
		int branches = hits.length + 1;
		int hit = (defaultHits > 0) ? 1 : 0;
		for (int i = hits.length - 1; i >= 0; hit += ((hits[i--] > 0) ? 1 : 0));
		return ((double) hit) / branches;
	}

	public boolean equals(Object obj)
	{
		if (this == obj)
			return true;
		if ((obj == null) || !(obj.getClass().equals(this.getClass())))
			return false;

		SwitchData switchData = (SwitchData) obj;
		return (this.defaultHits == switchData.defaultHits)
				&& (Arrays.equals(this.hits, switchData.hits))
				&& (this.switchNumber == switchData.switchNumber);
	}

	public int hashCode()
	{
		return this.switchNumber;
	}

	public int getNumberOfCoveredBranches()
	{
		int ret = (defaultHits > 0) ? 1 : 0;
		for (int i = hits.length -1; i >= 0;i--) 
		{
			if (hits[i] > 0) ret++;
		}
		return ret;
	}

	public int getNumberOfValidBranches()
	{
		return hits.length + 1;
	}

	public void merge(BranchCoverageData coverageData)
	{
		SwitchData switchData = (SwitchData) coverageData;
		defaultHits += switchData.defaultHits;
		for (int i = Math.min(hits.length, switchData.hits.length) - 1; i >= 0; i--)
			hits[i] += switchData.hits[i];
		if (switchData.hits.length > hits.length)
		{
			long[] old = hits;
			hits = new long[switchData.hits.length];
			System.arraycopy(old, 0, hits, 0, old.length);
			System.arraycopy(switchData.hits, old.length, hits, old.length, hits.length - old.length);
		}
		if ((this.keys.length == 0) && (switchData.keys.length > 0))
			this.keys = switchData.keys;
	}

}