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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*
*/
package org.hibernate.loader;
import java.util.Map;
import org.hibernate.persister.entity.Loadable;
import org.hibernate.util.CollectionHelper;
import org.hibernate.util.StringHelper;
/**
* EntityAliases which handles the logic of selecting user provided aliases (via return-property),
* before using the default aliases.
*
* @author max
*
*/
public class DefaultEntityAliases implements EntityAliases {
private final String[] suffixedKeyColumns;
private final String[] suffixedVersionColumn;
private final String[][] suffixedPropertyColumns;
private final String suffixedDiscriminatorColumn;
private final String suffix;
private final String rowIdAlias;
private final Map userProvidedAliases;
/**
* Calculate and cache select-clause aliases
*
* @param userProvidedAliases The explicit aliases provided in a result-set mapping.
* @param persister The persister for which we are generating select aliases
* @param suffix The calculated suffix.
*/
public DefaultEntityAliases(
Map userProvidedAliases,
Loadable persister,
String suffix) {
this.suffix = suffix;
this.userProvidedAliases = userProvidedAliases;
suffixedKeyColumns = determineKeyAlias( persister, suffix );
suffixedPropertyColumns = determinePropertyAliases( persister );
suffixedDiscriminatorColumn = determineDiscriminatorAlias( persister, suffix );
suffixedVersionColumn = determineVersionAlias( persister );
rowIdAlias = Loadable.ROWID_ALIAS + suffix; // TODO: not visible to the user!
}
public DefaultEntityAliases(Loadable persister, String suffix) {
this( CollectionHelper.EMPTY_MAP, persister, suffix );
}
private String[] determineKeyAlias(Loadable persister, String suffix) {
final String[] aliases;
final String[] keyColumnsCandidates = getUserProvidedAliases( persister.getIdentifierPropertyName(), null );
if ( keyColumnsCandidates == null ) {
aliases = getUserProvidedAliases(
"id",
getIdentifierAliases(persister, suffix)
);
}
else {
aliases = keyColumnsCandidates;
}
final String[] rtn = StringHelper.unquote( aliases, persister.getFactory().getDialect() );
intern( rtn );
return rtn;
}
private String[][] determinePropertyAliases(Loadable persister) {
return getSuffixedPropertyAliases( persister );
}
private String determineDiscriminatorAlias(Loadable persister, String suffix) {
String alias = getUserProvidedAlias( "class", getDiscriminatorAlias( persister, suffix ) );
return StringHelper.unquote( alias, persister.getFactory().getDialect() );
}
private String[] determineVersionAlias(Loadable persister) {
return persister.isVersioned()
? suffixedPropertyColumns[ persister.getVersionProperty() ]
: null;
}
protected String getDiscriminatorAlias(Loadable persister, String suffix) {
return persister.getDiscriminatorAlias(suffix);
}
protected String[] getIdentifierAliases(Loadable persister, String suffix) {
return persister.getIdentifierAliases(suffix);
}
protected String[] getPropertyAliases(Loadable persister, int j) {
return persister.getPropertyAliases(suffix, j);
}
private String[] getUserProvidedAliases(String propertyPath, String[] defaultAliases) {
String[] result = (String[]) userProvidedAliases.get(propertyPath);
if (result==null) {
return defaultAliases;
}
else {
return result;
}
}
private String getUserProvidedAlias(String propertyPath, String defaultAlias) {
String[] columns = (String[]) userProvidedAliases.get(propertyPath);
if (columns==null) {
return defaultAlias;
}
else {
return columns[0];
}
}
/**
* {@inheritDoc}
*/
public String[][] getSuffixedPropertyAliases(Loadable persister) {
final int size = persister.getPropertyNames().length;
final String[][] suffixedPropertyAliases = new String[size][];
for ( int j = 0; j < size; j++ ) {
suffixedPropertyAliases[j] = getUserProvidedAliases(
persister.getPropertyNames()[j],
getPropertyAliases( persister, j )
);
suffixedPropertyAliases[j] = StringHelper.unquote( suffixedPropertyAliases[j], persister.getFactory().getDialect() );
intern( suffixedPropertyAliases[j] );
}
return suffixedPropertyAliases;
}
/**
* {@inheritDoc}
*/
public String[] getSuffixedVersionAliases() {
return suffixedVersionColumn;
}
/**
* {@inheritDoc}
*/
public String[][] getSuffixedPropertyAliases() {
return suffixedPropertyColumns;
}
/**
* {@inheritDoc}
*/
public String getSuffixedDiscriminatorAlias() {
return suffixedDiscriminatorColumn;
}
/**
* {@inheritDoc}
*/
public String[] getSuffixedKeyAliases() {
return suffixedKeyColumns;
}
/**
* {@inheritDoc}
*/
public String getRowIdAlias() {
return rowIdAlias;
}
private static void intern(String[] strings) {
for (int i=0; i
