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 /*
  * Copyright 2010 JBoss Inc
  *
  * 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 org.drools.runtime.rule;
An interface for accumulate external function implementations
 
public interface AccumulateFunction extends Externalizable {

    
Creates and returns a new context object

Returns:
    public Serializable createContext();

    
Initializes the accumulator

Parameters:
context
Throws:
java.lang.Exception
    public void init(Serializable contextthrows Exception;

    
Executes the accumulation action

Parameters:
context
value
    public void accumulate(Serializable context,
                           Object value);

    
Reverses the accumulation action

Parameters:
context
value
Throws:
java.lang.Exception
    public void reverse(Serializable context,
                        Object valuethrows Exception;

    
Returns the current value in this accumulation session

Parameters:
context
Returns:
Throws:
java.lang.Exception
    public Object getResult(Serializable contextthrows Exception;

    
True if the function supports reverse. False otherwise.

Returns:
    public boolean supportsReverse();
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