py.una.pol.karaku.dao.entity.interceptors.BigDecimalInterceptor.java Source code

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Here is the source code for py.una.pol.karaku.dao.entity.interceptors.BigDecimalInterceptor.java

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/*-
 * Copyright (c)
 *
 *       2012-2014, Facultad Politcnica, Universidad Nacional de Asuncin.
 *       2012-2014, Facultad de Ciencias Mdicas, Universidad Nacional de Asuncin.
 *       2012-2013, Centro Nacional de Computacin, Universidad Nacional de Asuncin.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301  USA
 */
package py.una.pol.karaku.dao.entity.interceptors;

import java.lang.reflect.Field;
import java.math.BigDecimal;
import org.springframework.stereotype.Component;
import org.springframework.util.ReflectionUtils;
import py.una.pol.karaku.dao.entity.Operation;
import py.una.pol.karaku.exception.KarakuRuntimeException;

/**
 *
 * @author Arturo Volpe
 * @since 1.0
 * @version 1.0 Oct 3, 2013
 *
 */
@Component
public class BigDecimalInterceptor extends AbstractInterceptor {

    /**
     *
     */
    private static final int MAXIMUM_PRECISION = 2;

    @Override
    public Class<?>[] getObservedTypes() {

        return new Class<?>[] { BigDecimal.class };
    }

    @Override
    public Class<?>[] getObservedAnnotations() {

        return new Class<?>[] { void.class };
    }

    @Override
    public void intercept(Operation o, Field field, Object bean) {

        BigDecimal value = (BigDecimal) ReflectionUtils.getField(field, bean);
        if (value == null) {
            return;
        }
        if (value.longValue() < 1) {
            value = value.add(BigDecimal.ONE);
        }
        BigDecimal trailed = value.stripTrailingZeros();
        int precision = trailed.scale();
        if (precision > MAXIMUM_PRECISION) {
            throw new KarakuRuntimeException(
                    String.format("Attribute '%s' of bean '%s' has a precision of {%d}, maximum allowed is {%d}",
                            field.getName(), bean.getClass().getSimpleName(), precision, MAXIMUM_PRECISION));
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean interceptable(Operation op, Field field, Object bean) {

        return op != Operation.DELETE;
    }
}