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/**
* <copyright>
*
* Copyright (c) 2005, 2006, 2007 Springsite BV (The Netherlands) and others
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Martin Taal
* </copyright>
*
* $Id: ENumUserType.java,v 1.5 2007/02/01 12:34:14 mtaal Exp $
*/
package org.eclipse.emf.teneo.hibernate.mapping;
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.HashMap;
import java.util.Properties;
import org.eclipse.emf.common.util.AbstractEnumerator;
import org.eclipse.emf.common.util.Enumerator;
import org.eclipse.emf.teneo.classloader.ClassLoaderResolver;
import org.eclipse.emf.teneo.classloader.StoreClassLoadException;
import org.eclipse.emf.teneo.hibernate.HbMapperException;
import org.eclipse.emf.teneo.hibernate.mapper.HbMapperConstants;
import org.hibernate.HibernateException;
import org.hibernate.usertype.ParameterizedType;
import org.hibernate.usertype.UserType;
/**
* Implements the EMF UserType for an Enum
*
* @author <a href="mailto:mtaal@elver.org">Martin Taal</a>
* @version $Revision: 1.5 $ $Date: 2007/02/01 12:34:14 $
*/
public class ENumUserType implements UserType, ParameterizedType {
/** The sql types used for enums */
private static final int[] SQL_TYPES = new int[] { Types.VARCHAR };
/** The enum type we are handling here */
protected Class enumType;
/** The method which translates a string to an instance of the emf enum */
protected Method getMethod;
/** Hashmap with string to enum mappings */
private final HashMap localCache = new HashMap();
/*
* (non-Javadoc)
*
* @see org.hibernate.usertype.UserType#assemble(java.io.Serializable, java.lang.Object)
*/
public Object assemble(Serializable cached, Object owner) throws HibernateException {
return cached;
}
/*
* (non-Javadoc)
*
* @see org.hibernate.usertype.UserType#deepCopy(java.lang.Object)
*/
public Object deepCopy(Object value) throws HibernateException {
return value;
}
/*
* (non-Javadoc)
*
* @see org.hibernate.usertype.UserType#disassemble(java.lang.Object)
*/
public Serializable disassemble(Object value) throws HibernateException {
return (Serializable) value;
}
/** Compares the int values of the enumerates */
public boolean equals(Object x, Object y) throws HibernateException {
// todo: check compare on null values
if (x == null && y == null)
return true;
if (x == null || y == null)
return false;
if (x.getClass() != y.getClass())
return false;
assert (x instanceof AbstractEnumerator);
return ((AbstractEnumerator) x).getValue() == ((AbstractEnumerator) y).getValue();
}
/*
* (non-Javadoc)
*
* @see org.hibernate.usertype.UserType#hashCode(java.lang.Object)
*/
public int hashCode(Object x) throws HibernateException {
return x.hashCode();
}
/** Not mutable */
public boolean isMutable() {
return false;
}
/*
* (non-Javadoc)
*
* @see org.hibernate.usertype.UserType#nullSafeGet(java.sql.ResultSet, java.lang.String[], java.lang.Object)
*/
public Object nullSafeGet(ResultSet rs, String[] names, Object owner) throws HibernateException, SQLException {
final String name = rs.getString(names[0]);
if (rs.wasNull())
return null;
Enumerator enumValue = (Enumerator) localCache.get(name);
if (enumValue != null)
return enumValue;
// call the getMethod!
try {
enumValue = (Enumerator) getMethod.invoke(null, new Object[] { name });
localCache.put(name, enumValue);
return enumValue;
} catch (Exception e) {
throw new HbMapperException("Exception when getting enum for class: " + enumType.getName()
+ " using value: " + name, e);
}
}
/*
* (non-Javadoc)
*
* @see org.hibernate.usertype.UserType#nullSafeSet(java.sql.PreparedStatement, java.lang.Object, int)
*/
public void nullSafeSet(PreparedStatement st, Object value, int index) throws HibernateException, SQLException {
if (value == null) {
st.setNull(index, Types.VARCHAR);
} else {
st.setString(index, ((AbstractEnumerator) value).getLiteral());
}
}
/*
* (non-Javadoc)
*
* @see org.hibernate.usertype.UserType#replace(java.lang.Object, java.lang.Object, java.lang.Object)
*/
public Object replace(Object original, Object target, Object owner) throws HibernateException {
return original;
}
/** Returns the parameterizezd enumType */
public Class returnedClass() {
return enumType;
}
/** An enum is stored in one varchar */
public int[] sqlTypes() {
return SQL_TYPES;
}
/** Sets the enumclass */
public void setParameterValues(Properties parameters) {
final String enumClassName = parameters.getProperty(HbMapperConstants.ENUM_CLASS_PARAM);
try {
enumType = ClassLoaderResolver.classForName(enumClassName);
getMethod = enumType.getMethod("get", new Class[] { String.class });
} catch (StoreClassLoadException e) {
throw new HbMapperException("Enum class " + enumClassName + " can not be found", e);
} catch (NoSuchMethodException e) {
throw new HbMapperException("Get method not present in enum class " + enumClassName, e);
}
}
}
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