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a Java JDBC driver for reading comma-separated-value files
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/*
* CsvJdbc - a JDBC driver for CSV files
* Copyright (C) 2015 Simon Chenery
*
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.relique.jdbc.csv;
import java.sql.SQLException;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
class SearchedCaseExpression extends Expression
{
private List conditions;
private List values;
private Expression elseExpression;
public SearchedCaseExpression(List conditions,
List values, Expression elseExpression)
{
this.conditions = conditions;
this.values = values;
this.elseExpression = elseExpression;
}
@Override
public Object eval(Map env) throws SQLException
{
for (int i = 0; i < conditions.size(); i++)
{
Expression condition = conditions.get(i);
if (!(condition instanceof LogicalExpression && condition.isValid()))
{
throw new SQLException(CsvResources.getString("caseNotLogical"));
}
Boolean b = ((LogicalExpression)condition).isTrue(env);
if (b != null && b.booleanValue())
return values.get(i).eval(env);
}
if (elseExpression != null)
return elseExpression.eval(env);
return null;
}
@Override
public String toString()
{
StringBuilder sb = new StringBuilder("CASE");
for (int i = 0; i < conditions.size(); i++)
{
Expression condition = conditions.get(i);
sb.append(" WHEN ").append(condition.toString()).append(" THEN ").append(values.get(i));
}
if (elseExpression != null)
sb.append(" ELSE ").append(elseExpression);
sb.append(" END");
return sb.toString();
}
@Override
public List usedColumns(Set availableColumns)
{
List result = new LinkedList<>();
Iterator it = conditions.iterator();
while (it.hasNext())
{
result.addAll(it.next().usedColumns(availableColumns));
}
it = values.iterator();
while (it.hasNext())
{
result.addAll(it.next().usedColumns(availableColumns));
}
if (elseExpression != null)
result.addAll(elseExpression.usedColumns(availableColumns));
return result;
}
@Override
public List aggregateFunctions()
{
List result = new LinkedList<>();
Iterator it = conditions.iterator();
while (it.hasNext())
{
result.addAll(it.next().aggregateFunctions());
}
it = values.iterator();
while (it.hasNext())
{
result.addAll(it.next().aggregateFunctions());
}
if (elseExpression != null)
result.addAll(elseExpression.aggregateFunctions());
return result;
}
}
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