Logback: the reliable, generic, fast and flexible logging framework.
Copyright (C) 1999-2015, QOS.ch. All rights reserved.
This program and the accompanying materials are dual-licensed under
either the terms of the Eclipse Public License v1.0 as published by
the Eclipse Foundation
  or (per the licensee's choosing)
under the terms of the GNU Lesser General Public License version 2.1
as published by the Free Software Foundation.
/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.core.spi;

import java.util.ArrayList;
import java.util.List;

import ch.qos.logback.core.filter.Filter;
import ch.qos.logback.core.util.COWArrayList;

Implementation of FilterAttachable.
Author:
Ceki Gülcü/**
 * Implementation of FilterAttachable.
 * 
 * @author Ceki Gülcü
 */
final public class FilterAttachableImpl<E> implements FilterAttachable<E> {

    @SuppressWarnings("unchecked")
    COWArrayList<Filter<E>> filterList = new COWArrayList<Filter<E>>(new Filter[0]);

    
Add a filter to end of the filter list.
/**
     * Add a filter to end of the filter list.
     */
    public void addFilter(Filter<E> newFilter) {
        filterList.add(newFilter);
    }

    
Clear the filter chain
/**
     * Clear the filter chain
     */
    public void clearAllFilters() {
        filterList.clear();
    }

    
Loop through the filters in the list. As soon as a filter decides on
ACCEPT or DENY, then that value is returned. If all of the filters return
NEUTRAL, then NEUTRAL is returned.
/**
     * Loop through the filters in the list. As soon as a filter decides on
     * ACCEPT or DENY, then that value is returned. If all of the filters return
     * NEUTRAL, then NEUTRAL is returned.
     */
    public FilterReply getFilterChainDecision(E event) {

        final Filter<E>[] filterArrray = filterList.asTypedArray();
        final int len = filterArrray.length;

        for (int i = 0; i < len; i++) {
            final FilterReply r = filterArrray[i].decide(event);
            if (r == FilterReply.DENY || r == FilterReply.ACCEPT) {
                return r;
            }
        }

        // no decision
        return FilterReply.NEUTRAL;
    }

    public List<Filter<E>> getCopyOfAttachedFiltersList() {
        return new ArrayList<Filter<E>>(filterList);
    }
}