/*
* Copyright 2009 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.typehandler;
import java.math.BigDecimal;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.castor.core.util.Messages;
import org.exolab.castor.jdo.PersistenceException;
/**
* Class implementing the KeyGeneratorTypeHandler for BigDecimal type.
*
* @author <a href="mailto:ahmad DOT hassan AT gmail DOT com">Ahmad Hassan</a>
* @author <a href="mailto:ralf DOT joachim AT syscon DOT eu">Ralf Joachim</a>
* @version $Revision$ $Date: 2009-07-13 17:22:43 (Tue, 28 Jul 2009) $
*/
public final class KeyGeneratorTypeHandlerBigDecimal
implements KeyGeneratorTypeHandler <BigDecimal> {
/** Value to be returned by getValue() method if current row of the record set is not valid
* and the type handler should not fail in this case. */
private static final BigDecimal ZERO = new BigDecimal(0);
/** Value to add to another to increment this by one. */
private static final BigDecimal ONE = new BigDecimal(1);
/** <code>true</code> if the type handler should fail when current row of the record set is
* not valid, <code>false</code> otherwise. */
private final boolean _fail;
private BigDecimal allocationSize;
/**
* Construct an type handler for big decimal values.
*
* @param fail <code>true</code> if the type handler should fail when current row of the
* record set is not valid, <code>false</code> otherwise.
*/
public KeyGeneratorTypeHandlerBigDecimal(final boolean fail) {
_fail = fail;
this.allocationSize = ONE;
}
public KeyGeneratorTypeHandlerBigDecimal(final boolean fail, int allocationSize) {
this(fail);
this.allocationSize = new BigDecimal(allocationSize);
}
/**
* {@inheritDoc}
*/
public BigDecimal getNextValue(final ResultSet rs) throws PersistenceException, SQLException {
return increment(getValue(rs));
}
/**
* {@inheritDoc}
*/
public BigDecimal getValue(final ResultSet rs) throws PersistenceException, SQLException {
if (rs.next()) {
BigDecimal value = rs.getBigDecimal(1);
if (value == null) { value = ZERO; }
return value;
} else if (!_fail) {
return ZERO;
}
String msg = Messages.format("persist.keyGenFailed", "");
throw new PersistenceException(msg);
}
/**
* {@inheritDoc}
*/
public BigDecimal increment(final BigDecimal value) {
return value.add(allocationSize);
}
/**
* {@inheritDoc}
*/
public BigDecimal add(final BigDecimal value, final int offset) {
return value.add(new BigDecimal(offset));
}
/**
* {@inheritDoc}
*/
public void bindValue(final PreparedStatement stmt, final int index, final BigDecimal value)
throws SQLException {
stmt.setBigDecimal(index, value);
}
}