//$Id: Alias.java 5685 2005-02-12 07:19:50Z steveebersole $
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;
}
}
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