com.moss.hibernate.enumeration.AbstractEnumerationUserType.java Source code

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Here is the source code for com.moss.hibernate.enumeration.AbstractEnumerationUserType.java

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/**
 * Copyright (C) 2013, Moss Computing Inc.
 *
 * This file is part of hibernate-toolkit.
 *
 * hibernate-toolkit 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, or (at your option)
 * any later version.
 *
 * hibernate-toolkit 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 hibernate-toolkit; see the file COPYING.  If not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 *
 * Linking this library statically or dynamically with other modules is
 * making a combined work based on this library.  Thus, the terms and
 * conditions of the GNU General Public License cover the whole
 * combination.
 *
 * As a special exception, the copyright holders of this library give you
 * permission to link this library with independent modules to produce an
 * executable, regardless of the license terms of these independent
 * modules, and to copy and distribute the resulting executable under
 * terms of your choice, provided that you also meet, for each linked
 * independent module, the terms and conditions of the license of that
 * module.  An independent module is a module which is not derived from
 * or based on this library.  If you modify this library, you may extend
 * this exception to your version of the library, but you are not
 * obligated to do so.  If you do not wish to do so, delete this
 * exception statement from your version.
 */
package com.moss.hibernate.enumeration;

import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;

import org.hibernate.HibernateException;
import org.hibernate.usertype.EnhancedUserType;

public abstract class AbstractEnumerationUserType implements EnhancedUserType, Serializable {
    private static final int[] SQL_TYPES = { Types.VARCHAR };

    protected abstract Class getReturnedClass();

    protected abstract Object getInstance(String name);

    public int[] sqlTypes() {
        return SQL_TYPES;
    }

    public Class returnedClass() {
        return getReturnedClass();
    }

    public boolean equals(Object x, Object y) {
        return x == y;
    }

    public Object deepCopy(Object value) {
        return value;
    }

    public boolean isMutable() {
        return false;
    }

    public Object nullSafeGet(ResultSet resultSet, String[] names, Object owner)
            throws HibernateException, SQLException {

        String name = resultSet.getString(names[0]);
        return resultSet.wasNull() ? null : getInstance(name);
    }

    public void nullSafeSet(PreparedStatement statement, Object value, int index)
            throws HibernateException, SQLException {

        if (value == null) {
            statement.setNull(index, Types.VARCHAR);
        } else if (value instanceof SimpleEnumeration) {
            statement.setString(index, ((SimpleEnumeration) value).name());
        } else {
            statement.setString(index, objectToSQLString(value));
        }

    }

    public Serializable disassemble(Object value) throws HibernateException {
        if (value instanceof SimpleEnumeration)
            return ((SimpleEnumeration) value).name();
        else
            return objectToSQLString(value);
    }

    public Object assemble(Serializable cached, Object owner) throws HibernateException {
        return getInstance((String) cached);
    }

    public Object replace(Object original, Object target, Object owner) throws HibernateException {
        // return original since this persister is going to be immutable
        return original;
    }

    public int hashCode(Object x) throws HibernateException {
        if (x instanceof SimpleEnumeration)
            return ((SimpleEnumeration) x).name().hashCode();
        else
            return x.toString().hashCode();
    }

    public Object fromXMLString(String arg0) {
        return getInstance(arg0);
    }

    public String objectToSQLString(Object arg0) {
        if (arg0 == null)
            return "NULL";
        else
            return arg0.toString();
    }

    public String toXMLString(Object arg0) {
        if (arg0 == null)
            return "";
        return arg0.toString();
    }

}