net.sourceforge.atunes.kernel.modules.search.AndLogicalSearchOperator.java Source code

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Here is the source code for net.sourceforge.atunes.kernel.modules.search.AndLogicalSearchOperator.java

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/*
 * aTunes
 * Copyright (C) Alex Aranda, Sylvain Gaudard and contributors
 *
 * See http://www.atunes.org/wiki/index.php?title=Contributing for information about contributors
 *
 * http://www.atunes.org
 * http://sourceforge.net/projects/atunes
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

package net.sourceforge.atunes.kernel.modules.search;

import java.util.Collection;
import java.util.List;

import net.sourceforge.atunes.model.IAudioObject;
import net.sourceforge.atunes.model.ILogicalSearchOperator;
import net.sourceforge.atunes.model.ISearchNode;
import net.sourceforge.atunes.utils.I18nUtils;

import org.apache.commons.collections.CollectionUtils;

/**
 * Calculates "AND" operation
 * 
 * @author alex
 * 
 */
public final class AndLogicalSearchOperator implements ILogicalSearchOperator {

    @Override
    public String getDescription() {
        return I18nUtils.getString("ALL_RULES_ARE_TRUE");
    }

    @SuppressWarnings("unchecked")
    @Override
    public Collection<IAudioObject> evaluate(List<ISearchNode> operands) {
        Collection<IAudioObject> intersection = null;
        for (ISearchNode operand : operands) {
            Collection<IAudioObject> operandResult = operand.evaluate();
            if (operandResult != null) {
                if (intersection == null) {
                    intersection = operandResult;
                } else {
                    intersection = CollectionUtils.intersection(intersection, operandResult);
                }
            }
        }
        return intersection;
    }
}