001: /*
002: * Copyright 2002-2005 the original author or authors.
003: *
004: * Licensed under the Apache License, Version 2.0 (the "License");
005: * you may not use this file except in compliance with the License.
006: * You may obtain a copy of the License at
007: *
008: * http://www.apache.org/licenses/LICENSE-2.0
009: *
010: * Unless required by applicable law or agreed to in writing, software
011: * distributed under the License is distributed on an "AS IS" BASIS,
012: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013: * See the License for the specific language governing permissions and
014: * limitations under the License.
015: */
016:
017: package org.springframework.orm.hibernate3.support;
018:
019: import java.sql.PreparedStatement;
020: import java.sql.ResultSet;
021: import java.sql.SQLException;
022: import java.sql.Types;
023: import java.util.Arrays;
024:
025: import javax.transaction.TransactionManager;
026:
027: import org.springframework.jdbc.support.lob.LobCreator;
028: import org.springframework.jdbc.support.lob.LobHandler;
029:
030: /**
031: * Hibernate UserType implementation for byte arrays that get mapped to BLOBs.
032: * Retrieves the LobHandler to use from LocalSessionFactoryBean at config time.
033: *
034: * <p>Can also be defined in generic Hibernate mappings, as DefaultLobCreator will
035: * work with most JDBC-compliant database drivers. In this case, the field type
036: * does not have to be BLOB: For databases like MySQL and MS SQL Server, any
037: * large enough binary type will work.
038: *
039: * @author Juergen Hoeller
040: * @since 1.2
041: * @see org.springframework.orm.hibernate3.LocalSessionFactoryBean#setLobHandler
042: */
043: public class BlobByteArrayType extends AbstractLobType {
044:
045: /**
046: * Constructor used by Hibernate: fetches config-time LobHandler and
047: * config-time JTA TransactionManager from LocalSessionFactoryBean.
048: * @see org.springframework.orm.hibernate3.LocalSessionFactoryBean#getConfigTimeLobHandler
049: * @see org.springframework.orm.hibernate3.LocalSessionFactoryBean#getConfigTimeTransactionManager
050: */
051: public BlobByteArrayType() {
052: super ();
053: }
054:
055: /**
056: * Constructor used for testing: takes an explicit LobHandler
057: * and an explicit JTA TransactionManager (can be <code>null</code>).
058: */
059: protected BlobByteArrayType(LobHandler lobHandler,
060: TransactionManager jtaTransactionManager) {
061: super (lobHandler, jtaTransactionManager);
062: }
063:
064: public int[] sqlTypes() {
065: return new int[] { Types.BLOB };
066: }
067:
068: public Class returnedClass() {
069: return byte[].class;
070: }
071:
072: public boolean isMutable() {
073: return true;
074: }
075:
076: public boolean equals(Object x, Object y) {
077: return (x == y)
078: || (x instanceof byte[] && y instanceof byte[] && Arrays
079: .equals((byte[]) x, (byte[]) y));
080: }
081:
082: public Object deepCopy(Object value) {
083: if (value == null) {
084: return null;
085: }
086: byte[] original = (byte[]) value;
087: byte[] copy = new byte[original.length];
088: System.arraycopy(original, 0, copy, 0, original.length);
089: return copy;
090: }
091:
092: protected Object nullSafeGetInternal(ResultSet rs, String[] names,
093: Object owner, LobHandler lobHandler) throws SQLException {
094:
095: return lobHandler.getBlobAsBytes(rs, names[0]);
096: }
097:
098: protected void nullSafeSetInternal(PreparedStatement ps, int index,
099: Object value, LobCreator lobCreator) throws SQLException {
100:
101: lobCreator.setBlobAsBytes(ps, index, (byte[]) value);
102: }
103:
104: }
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