org.apache.commons.jexl2.JadeJexlArithmetic Maven / Gradle / Ivy

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Java implementation of the jade templating language

There is a newer version: 1.3.2

package org.apache.commons.jexl2;

import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.collections.ListUtils;

import java.util.Collection;

public class JadeJexlArithmetic extends JexlArithmetic {

    public JadeJexlArithmetic(boolean lenient) {
        super(lenient);
    }

    /**
     * using the original implementation
     * added check for empty lists
     * defaulting to "true"
     */
    @Override
    public boolean toBoolean(Object val) {
        if (val == null) {
            controlNullOperand();
            return false;
        } else if (val instanceof Boolean) {
            return ((Boolean) val).booleanValue();
        } else if (val instanceof Number) {
            double number = toDouble(val);
            return !Double.isNaN(number) && number != 0.d;
        } else if (val instanceof String) {
            String strval = val.toString();
            return strval.length() > 0 && !"false".equals(strval);
        } else if (val instanceof Collection) {
            return CollectionUtils.isNotEmpty((Collection) val);
        }

        return true;
    }

    @Override
    public Object add(Object left, Object right) {
        if (left instanceof String || right instanceof String) {
            return left.toString() + right.toString();
        }
        else {
            return super.add(left, right);
        }
    }
}