ArrayPicker.java

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/*
    Synthia, a data structure generator
    Copyright (C) 2019-2021 Laboratoire d'informatique formelle
    Université du Québec à Chicoutimi, Canada
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    This program 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 Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package ca.uqac.lif.synthia.util;
 
import ca.uqac.lif.synthia.CannotShrinkException;
import ca.uqac.lif.synthia.Picker;
import ca.uqac.lif.synthia.Shrinkable;
import ca.uqac.lif.synthia.collection.CompositePicker;
import ca.uqac.lif.synthia.random.RandomFloat;
 
/**
 * Picker that merges the result of other pickers into an array.
 * @ingroup API
 */
public class ArrayPicker extends CompositePicker<Object[]> implements Shrinkable<Object[]>
{
    /**
     * Creates a new array picker 
     * @param pickers The pickers used to generate the values
     */
    public ArrayPicker(Picker<?> ... pickers)
    {
        super(pickers);
    }
 
    /**
     * Returns a new array picker
     * @param pickers The pickers used to generate the values
     * @return The new array picker
     */
    @Override
    public ArrayPicker newPicker(Picker<?> ... pickers)
    {
        return new ArrayPicker(pickers);
    }
 
 
    /**
     * Return an array of values
     * @param values The values to return
     * @return The values
     */
    @Override
    public Object[] getOutput(Object ... values)
    {
        return values;
    }
 
    @SuppressWarnings({ "rawtypes", "unchecked" })
    @Override
    public ArrayPicker shrink(Object[] o, Picker<Float> decision, float magnitude)
    {
        Picker[] shrunk_pickers = new Picker[m_pickers.length];
        for (int i = 0; i < m_pickers.length; i++)
        {
            if (!(m_pickers[i] instanceof Shrinkable))
            {
                throw new CannotShrinkException(m_pickers[i]);
            }
            shrunk_pickers[i] = ((Shrinkable<Object>) m_pickers[i]).shrink(o[i], decision, 1);
        }
        return new ArrayPicker(shrunk_pickers);
    }
 
    @Override
    public ArrayPicker shrink(Object[] o)
    {
        return shrink(o, RandomFloat.instance, 1);
    }
}