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/*
* 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;
import java.sql.SQLException;
import org.apache.openjpa.jdbc.kernel.JDBCFetchConfiguration;
import org.apache.openjpa.jdbc.kernel.JDBCStore;
import org.apache.openjpa.jdbc.sql.Joins;
import org.apache.openjpa.jdbc.sql.Result;
import org.apache.openjpa.jdbc.sql.RowManager;
import org.apache.openjpa.jdbc.sql.SQLBuffer;
import org.apache.openjpa.jdbc.sql.Select;
import org.apache.openjpa.jdbc.sql.SelectExecutor;
import org.apache.openjpa.kernel.OpenJPAStateManager;
/**
* Maps a persistent field to the relational schema.
*
* @author Abe White
* @since 0.4.0
*/
public interface FieldStrategy
extends Strategy {
/**
* Set the class mapping using this strategy. This will be called before
* use.
*/
void setFieldMapping(FieldMapping owner);
/**
* Return whether this mapping can perform the given select type.
* Return 0 if the given type is not supported. If the given type is an
* eager parallel type, return the number of UNIONed selects necessary
* to fetch the data. Otherwise, return any positive number if the type
* is supported. The given state manager may be null if selecting
* multiple instances.
*
* @see Select
*/
int supportsSelect(Select sel, int type, OpenJPAStateManager sm,
JDBCStore store, JDBCFetchConfiguration fetch);
/**
* Fill in parallel eager select for related objects.
*
* @see #select
*/
void selectEagerParallel(SelectExecutor sel, OpenJPAStateManager sm,
JDBCStore store, JDBCFetchConfiguration fetch, int eagerMode);
/**
* Fill in joined select to related objects.
*
* @see #select
*/
void selectEagerJoin(Select sel, OpenJPAStateManager sm,
JDBCStore store, JDBCFetchConfiguration fetch, int eagerMode);
/**
* Whether the eager joins or selects used by this field are to-many.
*/
boolean isEagerSelectToMany();
/**
* Select the virtual row columns of this mapping.
*
* @param sel the select to add to
* @param sm the instance being loaded, or null if not
* initialized yet or selecting for multiple instances
* @param store the current store manager
* @param fetch fetch configuration
* @param eagerMode the eager fetch mode to use; this may be more
* restrictive than the mode of the fetch configuration
* @return > 0 if this mapping requires the selected data
* (if any), 0 if it selected data but does not
* require it, or < 0 if no data was selected
*/
int select(Select sel, OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch, int eagerMode);
/**
* Load the batched eager result.
*
* @param res originally the {@link Result} to load from, but this
* method may return a processed result form that will be
* passed to subsequent calls
*/
Object loadEagerParallel(OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch, Object res)
throws SQLException;
/**
* Load the joined eager result.
*/
void loadEagerJoin(OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch, Result res)
throws SQLException;
/**
* Load virtual row data; the given result is not guaranteed to contain
* data for this field, so the field mapping should make sure the
* result contains its needed column data before loading.
*/
void load(OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch, Result res)
throws SQLException;
/**
* Load secondary data using a connection from the store manager.
*/
void load(OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch)
throws SQLException;
///////////
// Queries
///////////
/**
* Translate the given external field value to its datastore equivalent.
* If the mapping occupies multiple columns in the datastore, return an
* object array, else return a single object. Simply returns the given
* object by default.
*/
Object toDataStoreValue(Object val, JDBCStore store);
/**
* Translate the given key value to its datastore equivalent. If the
* mapping occupies multiple columns in the datastore, return an object
* array, else return a single object. Simply returns the given object by
* default.
*/
Object toKeyDataStoreValue(Object val, JDBCStore store);
/**
* Append a where clause to the given statement checking if this value
* is empty. Appends impossible-to-satisfy SQL by default.
*/
void appendIsEmpty(SQLBuffer sql, Select sel, Joins joins);
/**
* Append a where clause to the given statement checking if this value
* is not empty. Appends always-satisfied SQL by default.
*/
void appendIsNotEmpty(SQLBuffer sql, Select sel, Joins joins);
/**
* Append a where clause to the given statement checking if this value
* is null.
*/
void appendIsNull(SQLBuffer sql, Select sel, Joins joins);
/**
* Append a where clause to the given statement checking if this value
* is not null.
*/
void appendIsNotNull(SQLBuffer sql, Select sel, Joins joins);
/**
* Append a where clause to the given statement checking the size
* of the value.
*/
void appendSize(SQLBuffer sql, Select sel, Joins joins);
/**
* Append the ordered column alias to the given statement.
*/
void appendIndex(SQLBuffer sql, Select sel, Joins joins);
/**
* Append the entity discriminator value to the given statement.
*/
void appendType(SQLBuffer sql, Select sel, Joins joins);
/**
* Join this value to the class table. Does nothing by default.
*/
Joins join(Joins joins, boolean forceOuter);
/**
* Join the key value to the class table. Does nothing by default.
*/
Joins joinKey(Joins joins, boolean forceOuter);
/**
* Join this value's table to the table for the related first class object
* type, if any. Does nothing by default.
*
* @param traverse if true, throw proper exception if it is not
* possible for this mapping to traverse into the related type
*/
Joins joinRelation(Joins joins, boolean forceOuter,
boolean traverse);
/**
* Join this value's table to the table for the related first class object
* key type, if any. Does nothing by default.
*
* @param traverse if true, throw proper exception if it is not
* possible for this mapping to traverse into the related type
*/
Joins joinKeyRelation(Joins joins, boolean forceOuter,
boolean traverse);
/**
* Load this field value using the given result. The result
* will contain the columns from {@link ValueMapping#getColumns}.
*/
Object loadProjection(JDBCStore store, JDBCFetchConfiguration fetch,
Result res, Joins joins)
throws SQLException;
/**
* Load this field's key value using the given result. The result will
* contain the columns from {@link ValueMapping#getColumns}.
*/
Object loadKeyProjection(JDBCStore store,
JDBCFetchConfiguration fetch, Result res, Joins joins)
throws SQLException;
//////////////
// Versioning
//////////////
/**
* Return true if this field can be used as part of a state image for
* optimistic locking.
*/
boolean isVersionable();
/**
* Add a WHERE condition to the row for this field such that the field's
* current DB value must equal the given previous value. Only versionable
* mappings must implement this method meaningfully.
*/
void where(OpenJPAStateManager sm, JDBCStore store, RowManager rm,
Object prevValue)
throws SQLException;
}
