/**
 *  ServingXML
 *  
 *  Copyright (C) 2006  Daniel Parker
 *    daniel.parker@servingxml.com 
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); 
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at 
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 * See the License for the specific language governing permissions and 
 * limitations under the License. 
 * 
 **/

package com.servingxml.components.service;

import com.servingxml.app.Service;
import com.servingxml.app.ServiceContext;
import com.servingxml.components.error.CatchError;
import com.servingxml.components.task.Task;
import com.servingxml.io.streamsink.StreamSink;
import com.servingxml.util.Name;
import com.servingxml.util.ServingXmlException;
import com.servingxml.app.Flow;
import com.servingxml.app.ParameterDescriptor;

/**
 * The <code>ServiceImpl</code> implements
 * the methods in the <code>Service</code> interface.
 *
 *  
 * @author Daniel A. Parker (daniel.parker@servingxml.com)
 */

public class ServiceImpl implements Service {

  private final ParameterDescriptor[] parameterDescriptors;
  private final Name serviceName;
  private final Task[] tasks;
  private final CatchError catchError;

  public ServiceImpl(ParameterDescriptor[] parameterDescriptors,
    Name serviceName, Task[] tasks, CatchError catchError) {

    this.parameterDescriptors = parameterDescriptors;
    this.serviceName = serviceName;
    this.tasks = tasks;
    this.catchError = catchError;
  }

  public void execute(ServiceContext context, Flow flow) {
    flow = flow.augmentParameters(context,parameterDescriptors);

    try {

      for (int i = 0; i < tasks.length; ++i) {
        Task task = tasks[i];     
        task.execute(context, flow);
      }
    } catch (ServingXmlException e) {
      StreamSink errOutput = flow.getDefaultStreamSink();
      catchError.catchError(context, flow, e, errOutput);
    }
  }
}
