/*

* Copyright 1990-2008, Mark Little, University of Newcastle upon Tyne

* and others contributors as indicated

* by the @authors tag. All rights reserved.

* See the copyright.txt in the distribution for a

* full listing of individual contributors.

* This copyrighted material is made available to anyone wishing to use,

* modify, copy, or redistribute it subject to the terms and conditions

* of the GNU Lesser General Public License, v. 2.1.

* This program is distributed in the hope that it will be useful, but WITHOUT A

* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A

* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

* You should have received a copy of the GNU Lesser General Public License,

* v.2.1 along with this distribution; if not, write to the Free Software

* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

* MA 02110-1301, USA.

*

* (C) 1990-2008,

*/

package org.javasim.streams;

import java.io.IOException;

/**

* Return true or false with probability given when constructed. Uses a

* UniformStream.

*/

public class Draw

{

/**

* Probability of true is 'p'.

*/

public Draw(double p)

{

s = new UniformStream(0, 1);

prob = p;

}

/**

* Probability 'p'. Ignore the first 'StreamSelect' values before starting

* to return values.

*/

public Draw(double p, int StreamSelect)

{

s = new UniformStream(0, 1, StreamSelect);

prob = p;

}

/**

* Probability 'p'. Ignore the first 'StreamSelect' values before starting

* to return values. The seeds to the UniformStream are 'MGSeed' and

* 'LGSeed'.

*/

public Draw(double p, int StreamSelect, long MGSeed, long LCGSeed)

{

s = new UniformStream(0, 1, StreamSelect, MGSeed, LCGSeed);

prob = p;

}

/**

* @return true with specified probability.

*/

public boolean getBoolean () throws IOException

{

if (s.getNumber() >= prob)

return true;

else

return false;

}

private UniformStream s;

private double prob;

}