/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.openjpa.jdbc.meta.strats;
import java.sql.Blob;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.apache.openjpa.jdbc.kernel.JDBCStore;
import org.apache.openjpa.jdbc.sql.DBDictionary;
import org.apache.openjpa.jdbc.sql.Row;
import org.apache.openjpa.jdbc.sql.SQLExceptions;
import org.apache.openjpa.kernel.OpenJPAStateManager;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.meta.JavaTypes;
import org.apache.openjpa.util.MetaDataException;
/**
* Mapping for serialized fields on a dictionary that has a maximum embedded
* BLOB size.
*
* @author Abe White
* @nojavadoc
* @since 0.4.0
*/
public class MaxEmbeddedBlobFieldStrategy
extends MaxEmbeddedLobFieldStrategy {
private static final Localizer _loc = Localizer.forPackage
(MaxEmbeddedBlobFieldStrategy.class);
private int _maxSize = 0;
protected int getExpectedJavaType() {
return JavaTypes.OBJECT;
}
protected void update(OpenJPAStateManager sm, Row row)
throws SQLException {
byte[] b = (byte[]) sm.getImplData(field.getIndex());
if (b == null || (b.length > _maxSize && !field.getColumns()[0].isNotNull()))
row.setNull(field.getColumns()[0], true);
else {
sm.setImplData(field.getIndex(), null);
DBDictionary.SerializedData dat =
new DBDictionary.SerializedData(b);
row.setObject(field.getColumns()[0], dat);
}
}
protected Boolean isCustom(OpenJPAStateManager sm, JDBCStore store) {
// have we already stored our serialized data?
byte[] b = (byte[]) sm.getImplData(field.getIndex());
if (b == null) {
Object o = sm.fetch(field.getIndex());
if (o == null)
return Boolean.FALSE;
// serialize field value
DBDictionary dict = field.getMappingRepository().getDBDictionary();
try {
b = dict.serialize(o, store);
} catch (SQLException se) {
throw SQLExceptions.getStore(se, dict);
}
// set in impl data so that we don't have to re-serialize on store
sm.setImplData(field.getIndex(), b);
}
return (b.length > _maxSize) ? null : Boolean.FALSE;
}
protected void putData(OpenJPAStateManager sm, ResultSet rs,
DBDictionary dict)
throws SQLException {
byte[] b = (byte[]) sm.setImplData(field.getIndex(), null);
Blob blob = rs.getBlob(1);
dict.putBytes(blob, b);
}
public void map(boolean adapt) {
if (!field.isSerialized())
throw new MetaDataException(_loc.get("not-serialized", field));
super.map(adapt);
}
public void initialize() {
DBDictionary dict = field.getMappingRepository().getDBDictionary();
_maxSize = dict.maxEmbeddedBlobSize;
field.setUsesImplData(Boolean.TRUE);
}
protected Object getValue(OpenJPAStateManager sm) {
byte[] b = (byte[]) sm.getImplData(field.getIndex());
if (b == null || (b.length > _maxSize && !field.getColumns()[0].isNotNull()))
return null;
sm.setImplData(field.getIndex(), null);
DBDictionary.SerializedData dat = new DBDictionary.SerializedData(b);
return dat;
}
}