/*
 * (c) Copyright 2006-2011 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.commons.ArrayUtil;

import java.lang.reflect.Array;

/**
 * Keeps an array of generators, of which it combines the products to an array.<br/>
 * <br/>
 * Created: 26.08.2006 09:37:55
 * @since 0.1
 * @author Volker Bergmann
 */
public class SimpleMultiSourceArrayGenerator<S> extends MultiGeneratorWrapper<S, S[]> {

    private Class<S> componentType;
    private boolean available;

    // constructors ----------------------------------------------------------------------------------------------------

    /** Initializes the generator to an array of source generators */
    @SuppressWarnings("unchecked")
	public SimpleMultiSourceArrayGenerator(Class<S> componentType, Generator<? extends S> ... sources) {
        super(ArrayUtil.arrayType(componentType), sources);
        this.componentType = componentType;
        this.available = true;
    }

    // Generator implementation ----------------------------------------------------------------------------------------

    @SuppressWarnings({ "unchecked", "rawtypes" })
	public ProductWrapper<S[]> generate(ProductWrapper<S[]> wrapper) {
		assertInitialized();
    	if (!available)
    		return null;
        S[] array = (S[]) Array.newInstance(componentType, availableSourceCount());
        for (int i = 0; i < array.length; i++) {
            try {
            	ProductWrapper<S> productWrapper = (ProductWrapper<S>) sources.get(i).generate((ProductWrapper) getSourceWrapper());
                if (productWrapper == null) {
                	available = false;
                	return null;
                }
				array[i] = productWrapper.unwrap();
            } catch (Exception e) {
                throw new RuntimeException("Generation failed for generator #" + i + " of " + this, e);
            }
        }
        return wrapper.wrap(array);
    }

    @Override
    public synchronized void reset() {
    	super.reset();
    	this.available = true;
    }
    
    @Override
    public synchronized void close() {
    	super.close();
    	this.available = false;
    }

}