ITransformationConnector.java

/* $Id$ */

/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.manifoldcf.agents.interfaces;

import org.apache.manifoldcf.core.interfaces.*;
import org.apache.manifoldcf.agents.interfaces.*;

import java.io.*;
import java.util.*;

/** This interface describes an instance of a connection to a translation engine.
*
* Each instance of this interface is used in only one thread at a time.  Connection Pooling
* on these kinds of objects is performed by the factory which instantiates connector objects
* from symbolic names and config parameters, and is pooled by these parameters.  That is, a pooled connector
* handle is used only if all the connection parameters for the handle match.
*
* Implementers of this interface should provide a default constructor which has this signature:
*
* xxx();
*
* Connector instances are either configured or not.  If configured, they will persist in a pool, and be
* reused multiple times.  Certain methods of a connector may be called before the connector is
* configured.  This includes basically all methods that permit inspection of the connector's
* capabilities. 
*
*
* The purpose of the transformation connector is to allow documents to be transformed prior to them
* being sent to an output connection.
*
*/
public interface ITransformationConnector extends IPipelineConnector
{
  public static final String _rcsid = "@(#)$Id$";

  /** Return a list of activities that this connector generates.
  * The connector does NOT need to be connected before this method is called.
  *@return the set of activities.
  */
  public String[] getActivitiesList();

  /** Request arbitrary connector information.
  * This method is called directly from the API in order to allow API users to perform any one of several connector-specific
  * queries.
  *@param output is the response object, to be filled in by this method.
  *@param command is the command, which is taken directly from the API request.
  *@return true if the resource is found, false if not.  In either case, output may be filled in.
  */
  public boolean requestInfo(Configuration output, String command)
    throws ManifoldCFException;
    
  // UI support methods are inherited from IConnector and IPipelineConnector.
  //
  
}