net.servicefixture.sample.util.EnumUserType.java Source code

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Here is the source code for net.servicefixture.sample.util.EnumUserType.java

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/*
 * Copyright 2006 (C) Chunyun Zhao(Chunyun.Zhao@gmail.com).
 * 
 * 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 net.servicefixture.sample.util;

import java.io.Serializable;
import java.lang.reflect.Method;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.util.Properties;

import org.hibernate.HibernateException;
import org.hibernate.usertype.ParameterizedType;
import org.hibernate.usertype.UserType;

/**
 * @author Chunyun Zhao
 * @since Aug 23, 2006
 */
public class EnumUserType implements UserType, ParameterizedType {
    private static final int[] SQL_TYPES = new int[] { Types.VARCHAR };
    private Class javaType;
    private Method fromStringMethod;

    public void setParameterValues(Properties parameters) {
        String javaTypeName = parameters.getProperty("javaType");
        try {
            javaType = Class.forName(javaTypeName);
            fromStringMethod = javaType.getMethod("fromString", new Class[] { String.class });
        } catch (ClassNotFoundException e) {
            throw new HibernateException("Class " + javaTypeName + " not found ", e);
        } catch (SecurityException e) {
            throw new HibernateException("Can not find method fromString(String) in " + javaTypeName, e);
        } catch (NoSuchMethodException e) {
            throw new HibernateException("Can not find method fromString(String) in " + javaTypeName, e);
        }
    }

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

    public Class returnedClass() {
        return javaType;
    }

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

    public int hashCode(Object x) throws HibernateException {
        return x.hashCode();
    }

    public Object nullSafeGet(ResultSet rs, String[] names, Object owner) throws HibernateException, SQLException {
        String value = rs.getString(names[0]);
        if (rs.wasNull()) {
            return null;
        }
        try {
            return fromStringMethod.invoke(null, new Object[] { value });
        } catch (Exception e) {
            throw new HibernateException("Unable to invoke method fromString(String) method.");
        }
    }

    public void nullSafeSet(PreparedStatement st, Object value, int index) throws HibernateException, SQLException {
        if (value == null) {
            st.setNull(index, Types.VARCHAR);
        } else {
            st.setString(index, value.toString());
        }
    }

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

    public boolean isMutable() {
        return false;
    }

    public Serializable disassemble(Object value) throws HibernateException {
        return (Serializable) value;
    }

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

    public Object replace(Object original, Object target, Object owner) throws HibernateException {
        return original;
    }
}