package adql.db.exception;
/*
* This file is part of ADQLLibrary.
*
* ADQLLibrary is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* ADQLLibrary 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 ADQLLibrary. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2012 - UDS/Centre de Données astronomiques de Strasbourg (CDS)
*/
import adql.db.DBChecker;
import adql.parser.ParseException;
import adql.query.from.ADQLTable;
import adql.query.operand.ADQLColumn;
/**
* This exception is thrown by {@link DBChecker} when a table does not exist
* or whose the schema reference is ambiguous.
*
* @author Grégory Mantelet (CDS)
* @version 08/2011
*
* @see DBChecker
*/
public class UnresolvedTableException extends ParseException {
private static final long serialVersionUID = 1L;
private final String tableName;
/* ************ */
/* CONSTRUCTORS */
/* ************ */
/**
* <p><b>UNKNOWN TABLE</b></p>
*
* <p>Builds the exception with an {@link ADQLTable} which does not exist.</p>
*
* @param table The unresolved {@link ADQLTable}.
*/
public UnresolvedTableException(ADQLTable table){
super(buildMessage("Unknown table", table));
initPosition(table);
tableName = (table != null) ? table.getTableName() : null;
}
/**
* <p><b>AMBIGUOUS TABLE NAME</b></p>
*
* <p>
* Builds the exception with an {@link ADQLTable} which does not have a schema reference AND which may come from more than one schema.
* The two given schema names are schemas which contain a table with the same name as the given one.
* </p>
*
* @param table The ambiguous {@link ADQLTable} (no schema reference).
* @param t1 First possibility.
* @param t2 A second possibility.
*/
public UnresolvedTableException(ADQLTable table, String t1, String t2){
super(buildMessage("Ambiguous table name", table, t1, t2));
initPosition(table);
tableName = (table != null) ? table.getTableName() : null;
}
/**
* Initializes the position at which this exception occurs.
*
* @param table The unresolved table.
*/
protected final void initPosition(ADQLTable table){
position = table.getPosition();
}
/**
* <p><b>UNKNOWN TABLE REFERENCE</b></p>
*
* <p>Builds the exception with an {@link ADQLColumn} whose the table reference is unknown.</p>
*
* @param column The {@link ADQLColumn} whose the table reference is unresolved.
*/
public UnresolvedTableException(ADQLColumn column){
super(buildMessage("Unknown table reference", column));
initPosition(column);
tableName = (column != null) ? column.getTableName() : null;
}
/**
* <p><b>AMBIGUOUS TABLE REFERENCE</b></p>
*
* <p>
* Builds the exception with an {@link ADQLColumn} which has an ambiguous table reference.
* The two given table correspond to tables which match with the table reference of the given {@link ADQLColumn}.
* </p>
*
* @param column The {@link ADQLColumn} whose the table reference is ambiguous.
* @param table1 A table whose the name match with the table reference of the column.
* @param table2 Another table whose the name match with the table reference of the column.
*/
public UnresolvedTableException(ADQLColumn column, String table1, String table2){
super(buildMessage("Ambiguous table reference", column, table1, table2));
initPosition(column);
tableName = (column != null) ? column.getTableName() : null;
}
protected final void initPosition(ADQLColumn column){
position = column.getPosition();
}
private static final String buildMessage(String msgStart, ADQLTable t){
StringBuffer msg = new StringBuffer();
msg.append(msgStart).append(" \"");
if (t.isSubQuery())
msg.append(t.getAlias()).append("\" !");
else
msg.append(t.getFullTableName()).append("\"").append(t.hasAlias() ? (" (alias " + t.getAlias() + ")") : "").append(" !");
return msg.toString();
}
private static final String buildMessage(String msgStart, ADQLTable t, String t1, String t2){
if (t1 != null && t2 != null){
StringBuffer msg = new StringBuffer(buildMessage(msgStart, t));
msg.append(" It may be (at least) \"").append(t1).append("\" or \"").append(t2).append("\".");
return msg.toString();
}else
return buildMessage(msgStart, t);
}
private static final String buildMessage(String msgStart, ADQLColumn c){
StringBuffer msg = new StringBuffer();
msg.append(msgStart);
msg.append(" \"").append(c.getFullColumnPrefix()).append("\" in \"").append(c.getFullColumnName()).append("\" !");
return msg.toString();
}
private static final String buildMessage(String msgStart, ADQLColumn c, String table1, String table2){
if (table1 != null && table2 != null){
StringBuffer msg = new StringBuffer(buildMessage(msgStart, c));
msg.append(" It may come (at least) from \"").append(table1).append("\" or from \"").append(table2).append("\".");
return msg.toString();
}else
return buildMessage(msgStart, c);
}
public final String getTableName(){
return tableName;
}
}