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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.strats;
import java.sql.SQLException;
import org.apache.openjpa.jdbc.kernel.JDBCFetchConfiguration;
import org.apache.openjpa.jdbc.kernel.JDBCStore;
import org.apache.openjpa.jdbc.meta.Embeddable;
import org.apache.openjpa.jdbc.meta.FieldMapping;
import org.apache.openjpa.jdbc.meta.Joinable;
import org.apache.openjpa.jdbc.meta.ValueHandler;
import org.apache.openjpa.jdbc.schema.Column;
import org.apache.openjpa.jdbc.schema.ColumnIO;
import org.apache.openjpa.jdbc.schema.ForeignKey;
import org.apache.openjpa.jdbc.schema.PrimaryKey;
import org.apache.openjpa.jdbc.sql.DBDictionary;
import org.apache.openjpa.jdbc.sql.Joins;
import org.apache.openjpa.jdbc.sql.Result;
import org.apache.openjpa.jdbc.sql.Row;
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.kernel.OpenJPAStateManager;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.meta.JavaTypes;
import org.apache.openjpa.meta.ValueStrategies;
import org.apache.openjpa.util.InternalException;
import org.apache.openjpa.util.MetaDataException;
import org.apache.openjpa.util.UserException;
/**
* Mapping for a single-valued field that delegates to a {@link ValueHandler}.
*
* @author Abe White
* @since 0.4.0
*/
public class HandlerFieldStrategy
extends AbstractFieldStrategy
implements Joinable, Embeddable {
private static final Object NULL = new Object();
private static final Localizer _loc = Localizer.forPackage
(HandlerFieldStrategy.class);
protected Column[] _cols = null;
protected ColumnIO _io = null;
protected Object[] _args = null;
protected boolean _load = false;
protected boolean _lob = false;
public void map(boolean adapt) {
if (field.getHandler() == null)
throw new MetaDataException(_loc.get("no-handler", field));
assertNotMappedBy();
// map join key (if any)
field.mapJoin(adapt, false);
field.getKeyMapping().getValueInfo().assertNoSchemaComponents
(field.getKey(), !adapt);
field.getElementMapping().getValueInfo().assertNoSchemaComponents
(field.getElement(), !adapt);
_io = new ColumnIO();
_cols = HandlerStrategies.map(field, field.getName(), _io, adapt);
if (field.getValueStrategy() == ValueStrategies.AUTOASSIGN) {
// first see if any columns already marked autoassign; if not mark
// them all
boolean marked = false;
for (int i = 0; !marked && i < _cols.length; i++)
if (_cols[i].isAutoAssigned())
marked = true;
if (!marked)
for (int i = 0; i < _cols.length; i++)
_cols[i].setAutoAssigned(true);
}
// add primary key columns to table pk if logical
field.mapPrimaryKey(adapt);
PrimaryKey pk = field.getTable().getPrimaryKey();
if (field.isPrimaryKey() && pk != null && (adapt || pk.isLogical()))
for (int i = 0; i < _cols.length; i++)
pk.addColumn(_cols[i]);
// set joinable
if (!field.getHandler().objectValueRequiresLoad(field))
for (int i = 0; i < _cols.length; i++)
field.getDefiningMapping().setJoinable(_cols[i], this);
}
public void initialize() {
_load = field.getHandler().objectValueRequiresLoad(field);
if (_load)
field.setUsesIntermediate(true);
for (int i = 0; !_lob && i < _cols.length; i++)
_lob = _cols[i].isLob();
Object args = field.getHandler().getResultArgument(field);
if (args == null)
_args = null;
else if (_cols.length == 1)
_args = new Object[]{ args };
else
_args = (Object[]) args;
}
public void insert(OpenJPAStateManager sm, JDBCStore store, RowManager rm)
throws SQLException {
if (field.getColumnIO().isInsertable(0, false)) {
Row row = field.getRow(sm, store, rm, Row.ACTION_INSERT);
if (row != null) {
Object value = sm.fetch(field.getIndex());
if (!HandlerStrategies.set(field, value, store, row, _cols,
_io, field.getNullValue() == FieldMapping.NULL_NONE))
if (field.getValueStrategy() != ValueStrategies.AUTOASSIGN)
throw new UserException(_loc.get("cant-set-value", row
.getFailedObject(), field, value));
}
}
}
public void update(OpenJPAStateManager sm, JDBCStore store, RowManager rm)
throws SQLException {
if (field.getColumnIO().isUpdatable(0, false)) {
Row row = field.getRow(sm, store, rm, Row.ACTION_UPDATE);
if (row != null) {
Object value = sm.fetch(field.getIndex());
if (!HandlerStrategies.set(field, value, store, row, _cols,
_io, field.getNullValue() == FieldMapping.NULL_NONE))
if (field.getValueStrategy() != ValueStrategies.AUTOASSIGN)
throw new UserException(_loc.get("cant-set-value", row
.getFailedObject(), field, value));
}
}
}
public void delete(OpenJPAStateManager sm, JDBCStore store, RowManager rm)
throws SQLException {
field.deleteRow(sm, store, rm);
}
public int supportsSelect(Select sel, int type, OpenJPAStateManager sm,
JDBCStore store, JDBCFetchConfiguration fetch) {
if ((type == Select.TYPE_JOINLESS && sel.isSelected(field.getTable()))
|| (_load && type == Select.TYPE_TWO_PART))
return 1;
return 0;
}
public int select(Select sel, OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch, int eagerMode) {
if (_cols.length == 0)
return -1;
if (sm != null && sm.getIntermediate(field.getIndex()) != null)
return -1;
if (_lob && !field.isPrimaryKey() && (sel.isDistinct() ||
eagerMode == JDBCFetchConfiguration.EAGER_NONE))
return -1;
sel.select(_cols, field.join(sel));
return 1;
}
public void load(OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch, Result res)
throws SQLException {
if (_cols.length == 0 || !res.containsAll(_cols))
return;
Object val = HandlerStrategies.loadDataStore(field, res, null, _cols);
if (!_load)
sm.store(field.getIndex(), field.getHandler().
toObjectValue(field, val));
else {
if (val == null)
val = NULL;
sm.setIntermediate(field.getIndex(), val);
}
}
public void load(OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch)
throws SQLException {
// even if no columns, allow a handler to load a generated value
if (_cols.length == 0) {
if (_load)
sm.store(field.getIndex(), field.getHandler().
toObjectValue(field, null, sm, store, fetch));
else
sm.store(field.getIndex(), field.getHandler().
toObjectValue(field, null));
return;
}
// load cached intermediate value?
if (_load) {
Object ds = sm.getIntermediate(field.getIndex());
if (ds != null) {
if (ds == NULL)
ds = null;
sm.store(field.getIndex(), field.getHandler().
toObjectValue(field, ds, sm, store, fetch));
return;
}
}
Select sel = store.getSQLFactory().newSelect();
sel.select(_cols);
field.wherePrimaryKey(sel, sm, store);
Result res = sel.execute(store, fetch);
Object val = null;
try {
if (res.next())
val = HandlerStrategies.loadDataStore(field, res, null, _cols);
} finally {
res.close();
}
loadEmbedded(sm, store, fetch, val);
}
public Object toDataStoreValue(Object val, JDBCStore store) {
return HandlerStrategies.toDataStoreValue(field, val, _cols, store);
}
public void appendIsNull(SQLBuffer sql, Select sel, Joins joins) {
joins = join(joins, false);
for (int i = 0; i < _cols.length; i++) {
if (i > 0) {
sql.append(" AND ");
}
// Some databases do not allow IS NULL for every column type - let the DBDictionary decide.
DBDictionary dict = sel.getDictionary();
sql.append(dict.getIsNullSQL(sel.getColumnAlias(_cols[i], joins), _cols[i].getType()));
}
}
public void appendIsNotNull(SQLBuffer sql, Select sel, Joins joins) {
joins = join(joins, false);
if (_cols.length > 1) {
sql.append("(");
}
for (int i = 0; i < _cols.length; i++) {
if (i > 0) {
sql.append(" OR ");
}
// Some databases do not allow IS NOT NULL for every column type - let the DBDictionary decide.
DBDictionary dict = sel.getDictionary();
sql.append(dict.getIsNotNullSQL(sel.getColumnAlias(_cols[i], joins), _cols[i].getType()));
}
if (_cols.length > 1)
sql.append(")");
}
public Joins join(Joins joins, boolean forceOuter) {
return field.join(joins, forceOuter, false);
}
public Joins joinRelation(Joins joins, boolean forceOuter,
boolean traverse) {
if (traverse)
HandlerStrategies.assertJoinable(field);
return joins;
}
public Object loadProjection(JDBCStore store, JDBCFetchConfiguration fetch,
Result res, Joins joins)
throws SQLException {
return HandlerStrategies.loadObject(field, null, store, fetch, res,
joins, _cols, _load);
}
public boolean isVersionable() {
return !_lob && !field.isJoinOuter()
&& field.getHandler().isVersionable(field);
}
public void where(OpenJPAStateManager sm, JDBCStore store, RowManager rm,
Object prevValue)
throws SQLException {
Row row = field.getRow(sm, store, rm, Row.ACTION_UPDATE);
if (row != null)
HandlerStrategies.where(field, prevValue, store, row, _cols);
}
///////////////////////////
// Joinable implementation
///////////////////////////
public int getFieldIndex() {
return field.getIndex();
}
public Object getPrimaryKeyValue(Result res, Column[] cols, ForeignKey fk,
JDBCStore store, Joins joins)
throws SQLException {
Column col;
Object val = null;
if (cols.length == 1) {
col = cols[0];
if (fk != null){
col = fk.getColumn(col);
}
//OJ-1793: Get the args from the handler and first check to see if the
//args are null. If they aren't null then use the first element in the args
//array rather than passing into 'getObject' the entire args array. This is
//akin to what is done in the 'else if' leg below.
Object[] args = (Object[]) field.getHandler().getResultArgument(field);
val = res.getObject(col, (args == null) ? null : args[0],
joins);
} else if (cols.length > 1) {
Object[] vals = new Object[cols.length];
Object[] args = (Object[]) field.getHandler().
getResultArgument(field);
for (int i = 0; i < vals.length; i++) {
col = cols[i];
if (fk != null)
col = fk.getColumn(col);
vals[i] = res.getObject(col, (args == null) ? null : args[i],
joins);
}
val = vals;
}
return field.getHandler().toObjectValue(field, val);
}
public Column[] getColumns() {
return _cols;
}
public Object[] getResultArguments() {
return _args;
}
public Object getJoinValue(Object fieldVal, Column col, JDBCStore store) {
Object val = HandlerStrategies.toDataStoreValue(field, fieldVal,
_cols, store);
if (val == null || _cols.length < 2)
return val;
for (int i = 0; i < _cols.length; i++)
if (_cols[i] == col)
return ((Object[]) val)[i];
throw new InternalException();
}
public Object getJoinValue(OpenJPAStateManager sm, Column col,
JDBCStore store) {
return getJoinValue(sm.fetch(field.getIndex()), col, store);
}
public void setAutoAssignedValue(OpenJPAStateManager sm, JDBCStore store,
Column col, Object autoInc) {
Object data;
if (_cols.length == 1)
data = JavaTypes.convert(autoInc, col.getJavaType());
else {
// multiple columns; have to get current value, replace this col's
// value with the given one, and reset
data = field.getHandler().toDataStoreValue(field,
sm.fetch(field.getIndex()), store);
if (data == null)
data = new Object[_cols.length];
for (int i = 0; i < _cols.length; i++) {
if (_cols[i] == col) {
((Object[]) data)[i] = JavaTypes.convert(autoInc,
col.getJavaType());
break;
}
}
}
Object val = field.getHandler().toObjectValue(field, data);
sm.store(field.getIndex(), val);
}
/////////////////////////////
// Embeddable implementation
/////////////////////////////
public ColumnIO getColumnIO() {
return _io;
}
public Object toEmbeddedDataStoreValue(Object val, JDBCStore store) {
// don't use HandlerStrategies.toDataStoreValue b/c we want relation ids
// to be represented by state managers, not the serialized id value
val = field.getHandler().toDataStoreValue(field, val, store);
if (val == null && _cols.length > 1)
return new Object[_cols.length];
return val;
}
public Object toEmbeddedObjectValue(Object val) {
if (!_load)
return field.getHandler().toObjectValue(field, val);
return UNSUPPORTED;
}
public void loadEmbedded(OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch, Object val)
throws SQLException {
if (val == null && _cols.length > 1)
val = new Object[_cols.length];
if (_load)
sm.store(field.getIndex(), field.getHandler().
toObjectValue(field, val, sm, store, fetch));
else
sm.store(field.getIndex(), field.getHandler().
toObjectValue(field, val));
}
}
