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/* --------------------------------------------------------------------
 *  Inugami  
 * --------------------------------------------------------------------
 * 
 * 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, version 3.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License 
 * along with this program. If not, see .
 */
package io.inugami.commons.engine.extractor.srategies;

import java.util.Collection;

import io.inugami.api.tools.NashornTools;
import io.inugami.commons.engine.extractor.ExtractCommand;
import io.inugami.commons.engine.extractor.ExtractCommandStrategy;

/**
 * LengthExtractCommandStrategy
 * @author patrick_guillerm
 * @since 23 mai 2018
 */
public class LengthExtractCommandStrategy implements ExtractCommandStrategy {
    
    // =========================================================================
    // ATTRIBUTES
    // =========================================================================
    @Override
    public boolean accept(Object value, ExtractCommand cmd) {
        return "length".equals(cmd.getFieldName()) && (value instanceof Collection || NashornTools.isArray(value));
    }
    
    @Override
    public Object process(Object value, ExtractCommand cmd) {
        final Collection collection = convertToList(value);
        return collection == null ? 0 : collection.size();
    }
    
    private Collection convertToList(Object value) {
        Collection result = null;
        if (NashornTools.isArray(value)) {
            result = NashornTools.convertToList(value);
        }
        else {
            result = (Collection) value;
        }
        return result;
    }
}