/*
 * (c) Copyright 2007-2010 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.task;

import org.databene.commons.Context;
import org.databene.commons.ErrorHandler;
import org.databene.commons.MessageHolder;

/**
 * Wraps a Task and forwards invocations.<br/>
 * <br/>
 * Created: 06.07.2007 06:36:22
 * @since 0.2
 * @author Volker Bergmann
 */
public abstract class TaskProxy<E extends Task> extends AbstractTask implements Cloneable, MessageHolder  {

    protected E realTask;

    public TaskProxy(E realTask) {
        setRealTask(realTask);
    }

	public E getRealTask() {
	    return realTask;
    }
    
    public void setRealTask(E realTask) {
        this.realTask = realTask;
        setTaskName(realTask != null ? realTask.getClass().getSimpleName() : "undefined");
    }
    
    public TaskResult execute(Context context, ErrorHandler errorHandler) {
        return realTask.execute(context, errorHandler);
    }
    
    @Override
    public void pageFinished() {
        realTask.pageFinished();
    }
    
    @Override
    public boolean isThreadSafe() {
        return realTask.isThreadSafe();
    }
    
    @Override
    public boolean isParallelizable() {
        return realTask.isParallelizable();
    }
    
    public String getMessage() {
    	return (realTask instanceof MessageHolder ? ((MessageHolder) realTask).getMessage() : null);
    }

    @Override
    public void close() {
        realTask.close();
    }
    
    @Override
    public abstract Object clone();

    @Override
    public String toString() {
        return getClass().getSimpleName() + '[' + realTask.toString() + ']';
    }
    
}