Filter.java

/*
 * Copyright © 2014 Cask Data, 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 co.cask.cdap.logging.filter;

import ch.qos.logback.classic.spi.ILoggingEvent;

/**
 * Represents a generic filter to filter ILoggingEvent objects.
 */
public interface Filter {
  boolean match(ILoggingEvent event);

  Filter EMPTY_FILTER = new EmptyFilter();

  /**
   * Empty filter.
   */
  class EmptyFilter implements Filter {
    @Override
    public boolean match(ILoggingEvent event) {
      return true;
    }
  }
}