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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.persister.entity;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
import org.hibernate.AssertionFailure;
import org.hibernate.HibernateException;
import org.hibernate.LockMode;
import org.hibernate.MappingException;
import org.hibernate.boot.model.relational.Database;
import org.hibernate.cache.spi.access.EntityDataAccess;
import org.hibernate.cache.spi.access.NaturalIdDataAccess;
import org.hibernate.cfg.Settings;
import org.hibernate.dialect.Dialect;
import org.hibernate.engine.jdbc.env.spi.JdbcEnvironment;
import org.hibernate.engine.spi.ExecuteUpdateResultCheckStyle;
import org.hibernate.engine.spi.Mapping;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.id.IdentityGenerator;
import org.hibernate.internal.FilterAliasGenerator;
import org.hibernate.internal.StaticFilterAliasGenerator;
import org.hibernate.internal.util.collections.ArrayHelper;
import org.hibernate.internal.util.collections.JoinedIterator;
import org.hibernate.internal.util.collections.SingletonIterator;
import org.hibernate.mapping.Column;
import org.hibernate.mapping.PersistentClass;
import org.hibernate.mapping.Subclass;
import org.hibernate.mapping.Table;
import org.hibernate.persister.spi.PersisterCreationContext;
import org.hibernate.sql.SelectFragment;
import org.hibernate.sql.SimpleSelect;
import org.hibernate.type.StandardBasicTypes;
import org.hibernate.type.Type;
/**
* Implementation of the "table-per-concrete-class" or "roll-down" mapping
* strategy for an entity and its inheritance hierarchy.
*
* @author Gavin King
*/
public class UnionSubclassEntityPersister extends AbstractEntityPersister {
// the class hierarchy structure
private final String subquery;
private final String tableName;
//private final String rootTableName;
private final String[] subclassClosure;
private final String[] spaces;
private final String[] subclassSpaces;
private final Object discriminatorValue;
private final String discriminatorSQLValue;
private final Map subclassByDiscriminatorValue = new HashMap();
private final String[] constraintOrderedTableNames;
private final String[][] constraintOrderedKeyColumnNames;
//INITIALIZATION:
public UnionSubclassEntityPersister(
final PersistentClass persistentClass,
final EntityDataAccess cacheAccessStrategy,
final NaturalIdDataAccess naturalIdRegionAccessStrategy,
final PersisterCreationContext creationContext) throws HibernateException {
super( persistentClass, cacheAccessStrategy, naturalIdRegionAccessStrategy, creationContext );
if ( getIdentifierGenerator() instanceof IdentityGenerator ) {
throw new MappingException(
"Cannot use identity column key generation with mapping for: " +
getEntityName()
);
}
final SessionFactoryImplementor factory = creationContext.getSessionFactory();
final Database database = creationContext.getMetadata().getDatabase();
final JdbcEnvironment jdbcEnvironment = database.getJdbcEnvironment();
// TABLE
tableName = determineTableName( persistentClass.getTable(), jdbcEnvironment );
//Custom SQL
String sql;
boolean callable = false;
ExecuteUpdateResultCheckStyle checkStyle = null;
sql = persistentClass.getCustomSQLInsert();
callable = sql != null && persistentClass.isCustomInsertCallable();
checkStyle = sql == null
? ExecuteUpdateResultCheckStyle.COUNT
: persistentClass.getCustomSQLInsertCheckStyle() == null
? ExecuteUpdateResultCheckStyle.determineDefault( sql, callable )
: persistentClass.getCustomSQLInsertCheckStyle();
customSQLInsert = new String[] {sql};
insertCallable = new boolean[] {callable};
insertResultCheckStyles = new ExecuteUpdateResultCheckStyle[] {checkStyle};
sql = persistentClass.getCustomSQLUpdate();
callable = sql != null && persistentClass.isCustomUpdateCallable();
checkStyle = sql == null
? ExecuteUpdateResultCheckStyle.COUNT
: persistentClass.getCustomSQLUpdateCheckStyle() == null
? ExecuteUpdateResultCheckStyle.determineDefault( sql, callable )
: persistentClass.getCustomSQLUpdateCheckStyle();
customSQLUpdate = new String[] {sql};
updateCallable = new boolean[] {callable};
updateResultCheckStyles = new ExecuteUpdateResultCheckStyle[] {checkStyle};
sql = persistentClass.getCustomSQLDelete();
callable = sql != null && persistentClass.isCustomDeleteCallable();
checkStyle = sql == null
? ExecuteUpdateResultCheckStyle.COUNT
: persistentClass.getCustomSQLDeleteCheckStyle() == null
? ExecuteUpdateResultCheckStyle.determineDefault( sql, callable )
: persistentClass.getCustomSQLDeleteCheckStyle();
customSQLDelete = new String[] {sql};
deleteCallable = new boolean[] {callable};
deleteResultCheckStyles = new ExecuteUpdateResultCheckStyle[] {checkStyle};
discriminatorValue = persistentClass.getSubclassId();
discriminatorSQLValue = String.valueOf( persistentClass.getSubclassId() );
// PROPERTIES
int subclassSpan = persistentClass.getSubclassSpan() + 1;
subclassClosure = new String[subclassSpan];
subclassClosure[0] = getEntityName();
// SUBCLASSES
subclassByDiscriminatorValue.put(
persistentClass.getSubclassId(),
persistentClass.getEntityName()
);
if ( persistentClass.isPolymorphic() ) {
Iterator iter = persistentClass.getSubclassIterator();
int k = 1;
while ( iter.hasNext() ) {
Subclass sc = (Subclass) iter.next();
subclassClosure[k++] = sc.getEntityName();
subclassByDiscriminatorValue.put( sc.getSubclassId(), sc.getEntityName() );
}
}
//SPACES
//TODO: i'm not sure, but perhaps we should exclude
// abstract denormalized tables?
int spacesSize = 1 + persistentClass.getSynchronizedTables().size();
spaces = new String[spacesSize];
spaces[0] = tableName;
Iterator iter = persistentClass.getSynchronizedTables().iterator();
for ( int i = 1; i < spacesSize; i++ ) {
spaces[i] = (String) iter.next();
}
HashSet subclassTables = new HashSet();
iter = persistentClass.getSubclassTableClosureIterator();
while ( iter.hasNext() ) {
final Table table = (Table) iter.next();
subclassTables.add( determineTableName( table, jdbcEnvironment ) );
}
subclassSpaces = ArrayHelper.toStringArray( subclassTables );
subquery = generateSubquery( persistentClass, creationContext.getMetadata() );
if ( isMultiTable() ) {
int idColumnSpan = getIdentifierColumnSpan();
ArrayList tableNames = new ArrayList();
ArrayList keyColumns = new ArrayList();
if ( !isAbstract() ) {
tableNames.add( tableName );
keyColumns.add( getIdentifierColumnNames() );
}
iter = persistentClass.getSubclassTableClosureIterator();
while ( iter.hasNext() ) {
Table tab = (Table) iter.next();
if ( !tab.isAbstractUnionTable() ) {
final String tableName = determineTableName( tab, jdbcEnvironment );
tableNames.add( tableName );
String[] key = new String[idColumnSpan];
Iterator citer = tab.getPrimaryKey().getColumnIterator();
for ( int k = 0; k < idColumnSpan; k++ ) {
key[k] = ( (Column) citer.next() ).getQuotedName( factory.getDialect() );
}
keyColumns.add( key );
}
}
constraintOrderedTableNames = ArrayHelper.toStringArray( tableNames );
constraintOrderedKeyColumnNames = ArrayHelper.to2DStringArray( keyColumns );
}
else {
constraintOrderedTableNames = new String[] {tableName};
constraintOrderedKeyColumnNames = new String[][] {getIdentifierColumnNames()};
}
initLockers();
initSubclassPropertyAliasesMap( persistentClass );
postConstruct( creationContext.getMetadata() );
}
public Serializable[] getQuerySpaces() {
return subclassSpaces;
}
public String getTableName() {
return subquery;
}
public Type getDiscriminatorType() {
return StandardBasicTypes.INTEGER;
}
public Object getDiscriminatorValue() {
return discriminatorValue;
}
public String getDiscriminatorSQLValue() {
return discriminatorSQLValue;
}
public String[] getSubclassClosure() {
return subclassClosure;
}
public String getSubclassForDiscriminatorValue(Object value) {
return (String) subclassByDiscriminatorValue.get( value );
}
public Serializable[] getPropertySpaces() {
return spaces;
}
protected boolean isDiscriminatorFormula() {
return false;
}
/**
* Generate the SQL that selects a row by id
*/
protected String generateSelectString(LockMode lockMode) {
SimpleSelect select = new SimpleSelect( getFactory().getDialect() )
.setLockMode( lockMode )
.setTableName( getTableName() )
.addColumns( getIdentifierColumnNames() )
.addColumns(
getSubclassColumnClosure(),
getSubclassColumnAliasClosure(),
getSubclassColumnLazyiness()
)
.addColumns(
getSubclassFormulaClosure(),
getSubclassFormulaAliasClosure(),
getSubclassFormulaLazyiness()
);
//TODO: include the rowids!!!!
if ( hasSubclasses() ) {
if ( isDiscriminatorFormula() ) {
select.addColumn( getDiscriminatorFormula(), getDiscriminatorAlias() );
}
else {
select.addColumn( getDiscriminatorColumnName(), getDiscriminatorAlias() );
}
}
if ( getFactory().getSettings().isCommentsEnabled() ) {
select.setComment( "load " + getEntityName() );
}
return select.addCondition( getIdentifierColumnNames(), "=?" ).toStatementString();
}
protected String getDiscriminatorFormula() {
return null;
}
public String getTableName(int j) {
return tableName;
}
public String[] getKeyColumns(int j) {
return getIdentifierColumnNames();
}
public boolean isTableCascadeDeleteEnabled(int j) {
return false;
}
public boolean isPropertyOfTable(int property, int j) {
return true;
}
// Execute the SQL:
public String fromTableFragment(String name) {
return getTableName() + ' ' + name;
}
@Override
protected String filterFragment(String name) {
return hasWhere()
? " and " + getSQLWhereString( name )
: "";
}
@Override
protected String filterFragment(String alias, Set treatAsDeclarations) {
return filterFragment( alias );
}
public String getSubclassPropertyTableName(int i) {
return getTableName();//ie. the subquery! yuck!
}
protected void addDiscriminatorToSelect(SelectFragment select, String name, String suffix) {
select.addColumn( name, getDiscriminatorColumnName(), getDiscriminatorAlias() );
}
protected int[] getPropertyTableNumbersInSelect() {
return new int[getPropertySpan()];
}
protected int getSubclassPropertyTableNumber(int i) {
return 0;
}
public int getSubclassPropertyTableNumber(String propertyName) {
return 0;
}
public boolean isMultiTable() {
// This could also just be true all the time...
return isAbstract() || hasSubclasses();
}
public int getTableSpan() {
return 1;
}
protected int[] getSubclassColumnTableNumberClosure() {
return new int[getSubclassColumnClosure().length];
}
protected int[] getSubclassFormulaTableNumberClosure() {
return new int[getSubclassFormulaClosure().length];
}
protected boolean[] getTableHasColumns() {
return new boolean[] {true};
}
protected int[] getPropertyTableNumbers() {
return new int[getPropertySpan()];
}
protected String generateSubquery(PersistentClass model, Mapping mapping) {
Dialect dialect = getFactory().getDialect();
Settings settings = getFactory().getSettings();
if ( !model.hasSubclasses() ) {
return model.getTable().getQualifiedName(
dialect,
settings.getDefaultCatalogName(),
settings.getDefaultSchemaName()
);
}
HashSet columns = new LinkedHashSet();
Iterator titer = model.getSubclassTableClosureIterator();
while ( titer.hasNext() ) {
Table table = (Table) titer.next();
if ( !table.isAbstractUnionTable() ) {
Iterator citer = table.getColumnIterator();
while ( citer.hasNext() ) {
columns.add( citer.next() );
}
}
}
StringBuilder buf = new StringBuilder()
.append( "( " );
Iterator siter = new JoinedIterator(
new SingletonIterator( model ),
model.getSubclassIterator()
);
while ( siter.hasNext() ) {
PersistentClass clazz = (PersistentClass) siter.next();
Table table = clazz.getTable();
if ( !table.isAbstractUnionTable() ) {
//TODO: move to .sql package!!
buf.append( "select " );
Iterator citer = columns.iterator();
while ( citer.hasNext() ) {
Column col = (Column) citer.next();
if ( !table.containsColumn( col ) ) {
int sqlType = col.getSqlTypeCode( mapping );
buf.append( dialect.getSelectClauseNullString( sqlType ) )
.append( " as " );
}
buf.append( col.getQuotedName( dialect ) );
buf.append( ", " );
}
buf.append( clazz.getSubclassId() )
.append( " as clazz_" );
buf.append( " from " )
.append(
table.getQualifiedName(
dialect,
settings.getDefaultCatalogName(),
settings.getDefaultSchemaName()
)
);
buf.append( " union " );
if ( dialect.supportsUnionAll() ) {
buf.append( "all " );
}
}
}
if ( buf.length() > 2 ) {
//chop the last union (all)
buf.setLength( buf.length() - ( dialect.supportsUnionAll() ? 11 : 7 ) );
}
return buf.append( " )" ).toString();
}
protected String[] getSubclassTableKeyColumns(int j) {
if ( j != 0 ) {
throw new AssertionFailure( "only one table" );
}
return getIdentifierColumnNames();
}
public String getSubclassTableName(int j) {
if ( j != 0 ) {
throw new AssertionFailure( "only one table" );
}
return tableName;
}
public int getSubclassTableSpan() {
return 1;
}
protected boolean isClassOrSuperclassTable(int j) {
if ( j != 0 ) {
throw new AssertionFailure( "only one table" );
}
return true;
}
@Override
public String getPropertyTableName(String propertyName) {
//TODO: check this....
return getTableName();
}
public String[] getConstraintOrderedTableNameClosure() {
return constraintOrderedTableNames;
}
public String[][] getContraintOrderedTableKeyColumnClosure() {
return constraintOrderedKeyColumnNames;
}
@Override
public FilterAliasGenerator getFilterAliasGenerator(String rootAlias) {
return new StaticFilterAliasGenerator( rootAlias );
}
}