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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, 2012, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program 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 distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.type;
import javax.persistence.Enumerated;
import javax.persistence.MapKeyEnumerated;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.util.Properties;
import org.jboss.logging.Logger;
import org.hibernate.AssertionFailure;
import org.hibernate.HibernateException;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.internal.util.ReflectHelper;
import org.hibernate.internal.util.config.ConfigurationHelper;
import org.hibernate.usertype.DynamicParameterizedType;
import org.hibernate.usertype.EnhancedUserType;
import org.hibernate.usertype.LoggableUserType;
/**
* Value type mapper for enumerations.
*
* Generally speaking, the proper configuration is picked up from the annotations associated with the mapped attribute.
*
* There are a few configuration parameters understood by this type mapper:
*
* enumClass - Names the enumeration class.
*
*
* useNamed - Should enum be mapped via name. Default is to map as ordinal. Used when
* annotations are not used (otherwise {@link javax.persistence.EnumType} is used).
*
*
* type - Identifies the JDBC type (via type code) to be used for the column.
*
*
*
* @author Emmanuel Bernard
* @author Hardy Ferentschik
* @author Steve Ebersole
*/
@SuppressWarnings("unchecked")
public class EnumType implements EnhancedUserType, DynamicParameterizedType,LoggableUserType, Serializable {
private static final Logger LOG = Logger.getLogger( EnumType.class.getName() );
public static final String ENUM = "enumClass";
public static final String NAMED = "useNamed";
public static final String TYPE = "type";
private Class enumClass;
private EnumValueMapper enumValueMapper;
private int sqlType = Types.INTEGER; // before any guessing
@Override
public int[] sqlTypes() {
return new int[] { sqlType };
}
@Override
public Class returnedClass() {
return enumClass;
}
@Override
public boolean equals(Object x, Object y) throws HibernateException {
return x == y;
}
@Override
public int hashCode(Object x) throws HibernateException {
return x == null ? 0 : x.hashCode();
}
@Override
public Object nullSafeGet(ResultSet rs, String[] names, SessionImplementor session, Object owner) throws SQLException {
if ( enumValueMapper == null ) {
resolveEnumValueMapper( rs, names[0] );
}
return enumValueMapper.getValue( rs, names );
}
private void resolveEnumValueMapper(ResultSet rs, String name) {
if ( enumValueMapper == null ) {
try {
resolveEnumValueMapper( rs.getMetaData().getColumnType( rs.findColumn( name ) ) );
}
catch (Exception e) {
// because some drivers do not implement this
LOG.debugf(
"JDBC driver threw exception calling java.sql.ResultSetMetaData.getColumnType; " +
"using fallback determination [%s] : %s",
enumClass.getName(),
e.getMessage()
);
// peek at the result value to guess type (this is legacy behavior)
try {
Object value = rs.getObject( name );
if ( Number.class.isInstance( value ) ) {
treatAsOrdinal();
}
else {
treatAsNamed();
}
}
catch (SQLException ignore) {
treatAsOrdinal();
}
}
}
}
private void resolveEnumValueMapper(int columnType) {
// fallback for cases where not enough parameter/parameterization information was passed in
if ( isOrdinal( columnType ) ) {
treatAsOrdinal();
}
else {
treatAsNamed();
}
}
@Override
public void nullSafeSet(PreparedStatement st, Object value, int index, SessionImplementor session) throws HibernateException, SQLException {
if ( enumValueMapper == null ) {
resolveEnumValueMapper( st, index );
}
enumValueMapper.setValue( st, (Enum) value, index );
}
private void resolveEnumValueMapper(PreparedStatement st, int index) {
if ( enumValueMapper == null ) {
try {
resolveEnumValueMapper( st.getParameterMetaData().getParameterType( index ) );
}
catch (Exception e) {
// because some drivers do not implement this
LOG.debugf(
"JDBC driver threw exception calling java.sql.ParameterMetaData#getParameterType; " +
"falling back to ordinal-based enum mapping [%s] : %s",
enumClass.getName(),
e.getMessage()
);
treatAsOrdinal();
}
}
}
@Override
public Object deepCopy(Object value) throws HibernateException {
return value;
}
@Override
public boolean isMutable() {
return false;
}
@Override
public Serializable disassemble(Object value) throws HibernateException {
return ( Serializable ) value;
}
@Override
public Object assemble(Serializable cached, Object owner) throws HibernateException {
return cached;
}
@Override
public Object replace(Object original, Object target, Object owner) throws HibernateException {
return original;
}
@Override
public void setParameterValues(Properties parameters) {
final ParameterType reader = (ParameterType) parameters.get( PARAMETER_TYPE );
// IMPL NOTE : be protective about not setting enumValueMapper (i.e. calling treatAsNamed/treatAsOrdinal)
// in cases where we do not have enough information. In such cases we do additional checks
// as part of nullSafeGet/nullSafeSet to query against the JDBC metadata to make the determination.
if ( reader != null ) {
enumClass = reader.getReturnedClass().asSubclass( Enum.class );
final boolean isOrdinal;
final javax.persistence.EnumType enumType = getEnumType( reader );
if ( enumType == null ) {
isOrdinal = true;
}
else if ( javax.persistence.EnumType.ORDINAL.equals( enumType ) ) {
isOrdinal = true;
}
else if ( javax.persistence.EnumType.STRING.equals( enumType ) ) {
isOrdinal = false;
}
else {
throw new AssertionFailure( "Unknown EnumType: " + enumType );
}
if ( isOrdinal ) {
treatAsOrdinal();
}
else {
treatAsNamed();
}
sqlType = enumValueMapper.getSqlType();
}
else {
String enumClassName = (String) parameters.get( ENUM );
try {
enumClass = ReflectHelper.classForName( enumClassName, this.getClass() ).asSubclass( Enum.class );
}
catch ( ClassNotFoundException exception ) {
throw new HibernateException( "Enum class not found", exception );
}
final Object useNamedSetting = parameters.get( NAMED );
if ( useNamedSetting != null ) {
final boolean useNamed = ConfigurationHelper.getBoolean( NAMED, parameters );
if ( useNamed ) {
treatAsNamed();
}
else {
treatAsOrdinal();
}
sqlType = enumValueMapper.getSqlType();
}
}
final String type = (String) parameters.get( TYPE );
if ( type != null ) {
sqlType = Integer.decode( type );
}
}
private void treatAsOrdinal() {
if ( enumValueMapper == null || ! OrdinalEnumValueMapper.class.isInstance( enumValueMapper ) ) {
enumValueMapper = new OrdinalEnumValueMapper();
sqlType = enumValueMapper.getSqlType();
}
}
private void treatAsNamed() {
if ( enumValueMapper == null || ! NamedEnumValueMapper.class.isInstance( enumValueMapper ) ) {
enumValueMapper = new NamedEnumValueMapper();
sqlType = enumValueMapper.getSqlType();
}
}
private javax.persistence.EnumType getEnumType(ParameterType reader) {
javax.persistence.EnumType enumType = null;
if ( reader.isPrimaryKey() ) {
MapKeyEnumerated enumAnn = getAnnotation( reader.getAnnotationsMethod(), MapKeyEnumerated.class );
if ( enumAnn != null ) {
enumType = enumAnn.value();
}
}
else {
Enumerated enumAnn = getAnnotation( reader.getAnnotationsMethod(), Enumerated.class );
if ( enumAnn != null ) {
enumType = enumAnn.value();
}
}
return enumType;
}
private T getAnnotation(Annotation[] annotations, Class anClass) {
for ( Annotation annotation : annotations ) {
if ( anClass.isInstance( annotation ) ) {
return (T) annotation;
}
}
return null;
}
@Override
public String objectToSQLString(Object value) {
return enumValueMapper.objectToSQLString( (Enum) value );
}
@Override
public String toXMLString(Object value) {
return enumValueMapper.toXMLString( (Enum) value );
}
@Override
public Object fromXMLString(String xmlValue) {
return enumValueMapper.fromXMLString( xmlValue );
}
@Override
public String toLoggableString(Object value, SessionFactoryImplementor factory) {
if ( enumValueMapper != null ) {
return enumValueMapper.toXMLString( (Enum) value );
}
return value.toString();
}
private static interface EnumValueMapper extends Serializable {
public int getSqlType();
public Enum getValue(ResultSet rs, String[] names) throws SQLException;
public void setValue(PreparedStatement st, Enum value, int index) throws SQLException;
public String objectToSQLString(Enum value);
public String toXMLString(Enum value);
public Enum fromXMLString(String xml);
}
public abstract class EnumValueMapperSupport implements EnumValueMapper {
protected abstract Object extractJdbcValue(Enum value);
@Override
public void setValue(PreparedStatement st, Enum value, int index) throws SQLException {
final Object jdbcValue = value == null ? null : extractJdbcValue( value );
final boolean traceEnabled = LOG.isTraceEnabled();
if ( jdbcValue == null ) {
if ( traceEnabled ) {
LOG.trace(String.format("Binding null to parameter: [%s]", index));
}
st.setNull( index, getSqlType() );
return;
}
if ( traceEnabled ) {
LOG.trace(String.format("Binding [%s] to parameter: [%s]", jdbcValue, index));
}
st.setObject( index, jdbcValue, EnumType.this.sqlType );
}
}
private class OrdinalEnumValueMapper extends EnumValueMapperSupport implements EnumValueMapper, Serializable {
private transient Enum[] enumsByOrdinal;
@Override
public int getSqlType() {
return Types.INTEGER;
}
@Override
public Enum getValue(ResultSet rs, String[] names) throws SQLException {
final int ordinal = rs.getInt( names[0] );
final boolean traceEnabled = LOG.isTraceEnabled();
if ( rs.wasNull() ) {
if ( traceEnabled ) {
LOG.trace(String.format("Returning null as column [%s]", names[0]));
}
return null;
}
final Enum enumValue = fromOrdinal( ordinal );
if ( traceEnabled ) {
LOG.trace(String.format("Returning [%s] as column [%s]", enumValue, names[0]));
}
return enumValue;
}
private Enum fromOrdinal(int ordinal) {
final Enum[] enumsByOrdinal = enumsByOrdinal();
if ( ordinal < 0 || ordinal >= enumsByOrdinal.length ) {
throw new IllegalArgumentException(
String.format(
"Unknown ordinal value [%s] for enum class [%s]",
ordinal,
enumClass.getName()
)
);
}
return enumsByOrdinal[ordinal];
}
private Enum[] enumsByOrdinal() {
if ( enumsByOrdinal == null ) {
enumsByOrdinal = enumClass.getEnumConstants();
if ( enumsByOrdinal == null ) {
throw new HibernateException( "Failed to init enum values" );
}
}
return enumsByOrdinal;
}
@Override
public String objectToSQLString(Enum value) {
return toXMLString( value );
}
@Override
public String toXMLString(Enum value) {
return Integer.toString( value.ordinal() );
}
@Override
public Enum fromXMLString(String xml) {
return fromOrdinal( Integer.parseInt( xml ) );
}
@Override
protected Object extractJdbcValue(Enum value) {
return value.ordinal();
}
}
private class NamedEnumValueMapper extends EnumValueMapperSupport implements EnumValueMapper, Serializable {
@Override
public int getSqlType() {
return Types.VARCHAR;
}
@Override
public Enum getValue(ResultSet rs, String[] names) throws SQLException {
final String value = rs.getString( names[0] );
final boolean traceEnabled = LOG.isTraceEnabled();
if ( rs.wasNull() ) {
if ( traceEnabled ) {
LOG.trace(String.format("Returning null as column [%s]", names[0]));
}
return null;
}
final Enum enumValue = fromName( value );
if ( traceEnabled ) {
LOG.trace(String.format("Returning [%s] as column [%s]", enumValue, names[0]));
}
return enumValue;
}
private Enum fromName(String name) {
try {
return Enum.valueOf( enumClass, name );
}
catch ( IllegalArgumentException iae ) {
throw new IllegalArgumentException(
String.format(
"Unknown name value [%s] for enum class [%s]",
name,
enumClass.getName()
)
);
}
}
@Override
public String objectToSQLString(Enum value) {
return '\'' + toXMLString( value ) + '\'';
}
@Override
public String toXMLString(Enum value) {
return value.name();
}
@Override
public Enum fromXMLString(String xml) {
return fromName( xml );
}
@Override
protected Object extractJdbcValue(Enum value) {
return value.name();
}
}
public boolean isOrdinal() {
return isOrdinal( sqlType );
}
private boolean isOrdinal(int paramType) {
switch ( paramType ) {
case Types.INTEGER:
case Types.NUMERIC:
case Types.SMALLINT:
case Types.TINYINT:
case Types.BIGINT:
case Types.DECIMAL: //for Oracle Driver
case Types.DOUBLE: //for Oracle Driver
case Types.FLOAT: //for Oracle Driver
return true;
case Types.CHAR:
case Types.LONGVARCHAR:
case Types.VARCHAR:
return false;
default:
throw new HibernateException( "Unable to persist an Enum in a column of SQL Type: " + paramType );
}
}
}
