/*
* 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.sql;
import org.hibernate.dialect.Dialect;
/**
* An alias generator for SQL identifiers
* @author Gavin King
*/
public final class Alias {
private final int length;
private final String suffix;
/**
* Constructor for Alias.
*/
public Alias(int length, String suffix) {
super();
this.length = (suffix==null) ? length : length - suffix.length();
this.suffix = suffix;
}
/**
* Constructor for Alias.
*/
public Alias(String suffix) {
super();
this.length = Integer.MAX_VALUE;
this.suffix = suffix;
}
public String toAliasString(String sqlIdentifier) {
char begin = sqlIdentifier.charAt(0);
int quoteType = Dialect.QUOTE.indexOf(begin);
String unquoted = getUnquotedAliasString(sqlIdentifier, quoteType);
if ( quoteType >= 0 ) {
char endQuote = Dialect.CLOSED_QUOTE.charAt(quoteType);
return begin + unquoted + endQuote;
}
else {
return unquoted;
}
}
public String toUnquotedAliasString(String sqlIdentifier) {
return getUnquotedAliasString(sqlIdentifier);
}
private String getUnquotedAliasString(String sqlIdentifier) {
char begin = sqlIdentifier.charAt(0);
int quoteType = Dialect.QUOTE.indexOf(begin);
return getUnquotedAliasString(sqlIdentifier, quoteType);
}
private String getUnquotedAliasString(String sqlIdentifier, int quoteType) {
String unquoted = sqlIdentifier;
if ( quoteType >= 0 ) {
//if the identifier is quoted, remove the quotes
unquoted = unquoted.substring( 1, unquoted.length()-1 );
}
if ( unquoted.length() > length ) {
//truncate the identifier to the max alias length, less the suffix length
unquoted = unquoted.substring(0, length);
}
if ( suffix == null ) {
return unquoted;
}
else {
return unquoted + suffix;
}
}
public String[] toUnquotedAliasStrings(String[] sqlIdentifiers) {
String[] aliases = new String[ sqlIdentifiers.length ];
for ( int i=0; i<sqlIdentifiers.length; i++ ) {
aliases[i] = toUnquotedAliasString(sqlIdentifiers[i]);
}
return aliases;
}
public String[] toAliasStrings(String[] sqlIdentifiers) {
String[] aliases = new String[ sqlIdentifiers.length ];
for ( int i=0; i<sqlIdentifiers.length; i++ ) {
aliases[i] = toAliasString(sqlIdentifiers[i]);
}
return aliases;
}
}