/*
 * Copyright 2005 the original author or authors.
 * 
 * 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.wamblee.crawler.kiss.main;

import java.util.List;

import org.wamblee.conditions.Condition;
import org.wamblee.crawler.kiss.guide.MatchVisitor;
import org.wamblee.crawler.kiss.guide.Program;
import org.wamblee.crawler.kiss.guide.TVGuide;

/**
 * Obtains a list of interesting programs from a TV guide and decides what to do
 * with them.
 */
public class ProgramFilter {

    private Condition<Program> _condition;

    private ProgramAction _action;

    /**
     * Constructs the program filter. 
     * @param aCondition Condition used to find interesting programs. 
     * @param aAction Corresponding action to execute for matching programs. 
     */
    public ProgramFilter(Condition<Program> aCondition, ProgramAction aAction) {
        _condition = aCondition;
        _action = aAction;
    }

    /**
     * Gets the action. 
     * @return Action. 
     */
    public ProgramAction getAction() {
        return _action;
    }

    /**
     * Applies the filter to a TV guide. 
     * @param aGuide TV guide. 
     * @return List of matching programs. 
     */
    public List<Program> apply(TVGuide aGuide) {
        MatchVisitor matcher = new MatchVisitor(_condition);
        aGuide.accept(matcher);
        return matcher.getMatches();
    }
}