/**
* Copyright (c) 2011-2012 Optimax Software Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Optimax Software, ElasticInbox, nor the names
* of its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. 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 com.elasticinbox.lmtp.filter;
import java.util.LinkedList;
import java.util.List;
/**
* This processor is modified implementation of Chain of Responsibility pattern.
* Filters are applied in the given order. Each filter (handler) processes input
* and passes output to the next one. Final result returned by processor.
*
* @author rustam
*
* @param <T>
*/
public class FilterProcessor<T>
{
private List<Filter<T>> filters;
public FilterProcessor() {
filters = new LinkedList<Filter<T>>();
}
/**
* Add filter to the bottom of the chain
*
* @param filter
*/
public void add(Filter<T> filter) {
filters.add(filter);
}
/**
* Perform filtering process
*
* @param input
* @return
*/
public T doFilter(final T input)
{
T output = input;
for (Filter<T> filter : filters) {
output = filter.filter(output);
}
return output;
}
}