/*
* Copyright 2008 Thomas Fach, Ralf Joachim
*
* 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 org.castor.cpa.persistence.sql.keygen;
import java.net.InetAddress;
import java.sql.Connection;
import java.sql.Types;
import java.text.DecimalFormat;
import java.util.Properties;
import java.util.StringTokenizer;
import org.castor.core.util.Messages;
import org.exolab.castor.jdo.PersistenceException;
import org.exolab.castor.mapping.MappingException;
import org.exolab.castor.persist.spi.KeyGenerator;
import org.exolab.castor.persist.spi.PersistenceFactory;
/**
* UUID key generator.
*
* @see UUIDKeyGeneratorFactory
* @author <a href="mailto:thomas DOT fach AT publica DOT de">Thomas Fach</a>
* @author <a href="mailto:bruce DOT snyder AT gmail DOT com">Bruce Snyder</a>
* @author <a href="mailto:ralf DOT joachim AT syscon DOT eu">Ralf Joachim</a>
* @version $Revision: 7951 $ $Date: 2006-04-10 16:39:24 -0600 (Mon, 10 Apr 2006) $
*/
public final class UUIDKeyGenerator implements KeyGenerator {
//-----------------------------------------------------------------------------------
private static final DecimalFormat IP_FORMAT = new DecimalFormat("000");
private static final DecimalFormat TIME_FORMAT = new DecimalFormat("0000000000000");
private static final DecimalFormat COUNTER_FORMAT = new DecimalFormat("00000");
private static final long COUNTER_MAX = 99999;
private static long _staticCounter = 0;
private String _hostAddress;
//-----------------------------------------------------------------------------------
/**
* Initialize the UUID key generator.
*/
public UUIDKeyGenerator(final PersistenceFactory factory, final int sqlType)
throws MappingException {
supportsSqlType(sqlType);
initHostAddress();
}
private void initHostAddress() throws MappingException {
try {
String host = InetAddress.getLocalHost().getHostAddress();
StringBuffer sb = new StringBuffer();
StringTokenizer st = new StringTokenizer(host, ".");
while (st.hasMoreTokens()) {
sb.append(IP_FORMAT.format(new Integer(st.nextToken())));
}
_hostAddress = sb.toString();
} catch (Exception ex) {
throw new MappingException(Messages.format(
"persist.keyGenSQL", getClass().getName(), ex.toString()), ex);
}
}
//-----------------------------------------------------------------------------------
/**
* {@inheritDoc}
*/
public Object generateKey(final Connection conn, final String tableName,
final String primKeyName, final Properties props) throws PersistenceException {
StringBuffer sb = new StringBuffer();
// getting IP (fixed length: 12 character)
sb.append(_hostAddress);
// getting currentTimeMillis (fixed length: 13 character)
sb.append(TIME_FORMAT.format(System.currentTimeMillis()));
// getting static counter (fixed length: 5 character)
if (_staticCounter >= COUNTER_MAX) { _staticCounter = 0; }
_staticCounter++;
sb.append(COUNTER_FORMAT.format(_staticCounter));
return sb.toString();
}
/**
* {@inheritDoc}
*/
public void supportsSqlType(final int sqlType) throws MappingException {
if ((sqlType != Types.CHAR)
&& (sqlType != Types.VARCHAR)
&& (sqlType != Types.LONGVARCHAR)) {
throw new MappingException(Messages.format("mapping.keyGenSQLType",
getClass().getName(), new Integer(sqlType)));
}
}
/**
* {@inheritDoc}
*/
public byte getStyle() {
return BEFORE_INSERT;
}
/**
* {@inheritDoc}
*/
public boolean isInSameConnection() {
return true;
}
/**
* {@inheritDoc}
*/
public String patchSQL(final String insert, final String primKeyName) {
return insert;
}
//-----------------------------------------------------------------------------------
}