woko.hibernate.HibernatePrimaryKeyConverter.java Source code

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Here is the source code for woko.hibernate.HibernatePrimaryKeyConverter.java

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/*
 * Copyright 2001-2012 Remi Vankeisbelck
 *
 * 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 woko.hibernate;

import org.hibernate.SessionFactory;
import org.hibernate.metadata.ClassMetadata;
import woko.util.Util;
import woko.util.WLogger;

import java.io.Serializable;
import java.text.DateFormat;
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Date;

/**
 * Primary key management for hibernate.
 */
public class HibernatePrimaryKeyConverter {

    private static final WLogger logger = WLogger.getLogger(HibernatePrimaryKeyConverter.class);

    /**
     * Convert passed string value to a Serializable primary key for passed target conversion type
     * @param value the strigified value
     * @param targetConversionType the target conversion type
     * @return the Serializable for passed string key
     */
    public Serializable convert(String value, Class<?> targetConversionType) {
        logger.debug("converting String value=$value to type " + targetConversionType.getName() + "...");
        Serializable result = null;
        if (Number.class.isAssignableFrom(targetConversionType)) {
            try {
                result = NumberFormat.getInstance().parse(value);
            } catch (ParseException e) {
                logger.debug("Unable to parse Number from str " + value + ", returning null");
            }
        } else if (Date.class.isAssignableFrom(targetConversionType)) {
            try {
                result = DateFormat.getInstance().parse(value);
            } catch (ParseException e) {
                logger.debug("Unable to parse Date from str " + value + ", returning null");
            }
        } else if (String.class.equals(targetConversionType)) {
            result = value;
        } else {
            String msg = "Supplied primary key type " + targetConversionType.getName() + " is not supported.";
            logger.error(msg);
            throw new UnsupportedOperationException(msg);
        }
        if (result != null) {
            logger.debug("converted String value=" + value + " to " + result + ", class=" + result.getClass());
        }
        return result;
    }

    /**
     * Extract and return primary key value for persistent entity, using mapping metadata.
     * @param sessionFactory the Hibernate session factory
     * @param entity the entity to get the primary key for
     * @param entityClass the entity class
     * @return the primary key value for passed entity
     */
    public Serializable getPrimaryKeyValue(SessionFactory sessionFactory, Object entity, Class<?> entityClass) {
        ClassMetadata cm = sessionFactory.getClassMetadata(entityClass);
        if (cm == null) {
            return null;
        }
        String idPropName = cm.getIdentifierPropertyName();
        if (idPropName == null) {
            return null;
        }
        return (Serializable) Util.getPropertyValue(entity, idPropName);
    }

}