/*
 * (c) Copyright 2007-2011 by Volker Bergmann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, is permitted under the terms of the
 * GNU General Public License.
 *
 * For redistributing this software or a derivative work under a license other
 * than the GPL-compatible Free Software License as defined by the Free
 * Software Foundation or approved by OSI, you must first obtain a commercial
 * license to this software product from Volker Bergmann.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
 * REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
 * HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package org.databene.benerator.wrapper;

import org.databene.benerator.Generator;
import org.databene.benerator.GeneratorContext;
import org.databene.benerator.distribution.Distribution;
import org.databene.benerator.distribution.SequenceManager;

/**
 * A generator proxy that forwards the output of another generator with a random number of repetitions.<br/>
 * <br/>
 * Created: 18.08.2007 17:08:10
 * @author Volker Bergmann
 */
public class RepeatGeneratorProxy<E> extends CardinalGenerator<E, E> {

    private Integer repCount;
    private Integer totalReps;
    private E currentValue;

    public RepeatGeneratorProxy() {
        this(null, 0, 3);
    }

    public RepeatGeneratorProxy(Generator<E> source, int minRepetitions, int maxRepetitions) {
        this(source, minRepetitions, maxRepetitions, 1, SequenceManager.RANDOM_SEQUENCE);
    }

    public RepeatGeneratorProxy(Generator<E> source, int minRepetitions, int maxRepetitions, 
    		int repetitionGranularity, Distribution repetitionDistribution) {
        super(source, false, minRepetitions, maxRepetitions, repetitionGranularity, repetitionDistribution);
    }

    public Class<E> getGeneratedType() {
    	return getSource().getGeneratedType();
    }
    
    @Override
	public void init(GeneratorContext context) {
        super.init(context);
        resetMembers();
    }

	private void resetMembers() {
	    repCount = -1;
	    totalReps = -1;
    }

	public ProductWrapper<E> generate(ProductWrapper<E> wrapper) {
        assertInitialized();
        if (repCount == -1 || repCount >= totalReps) {
    	    wrapper = getSource().generate(wrapper);
    	    if (wrapper == null)
    	    	return null;
    	    else
    	    	currentValue = wrapper.unwrap();
    	    repCount = 0;
    	    totalReps = generateCardinal();
        } else {
            wrapper.wrap(currentValue);
            repCount++;
        }
        return wrapper.wrap(currentValue);
    }
	
	@Override
	public void reset() {
	    super.reset();
	    cardinalGenerator.reset();
	    resetMembers();
	}

}