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a Java JDBC driver for reading comma-separated-value files
/*
* CsvJdbc - a JDBC driver for CSV files
* Copyright (C) 2008 Mario Frasca
*
* 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.Date;
import java.sql.SQLException;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
class RelopExpression extends LogicalExpression
{
String op;
Expression left, right;
boolean isValid;
public RelopExpression(String op, Expression left, Expression right)
{
isValid = !(left instanceof LogicalExpression || right instanceof LogicalExpression);
this.op = op;
this.left = left;
this.right = right;
}
public Boolean isTrue(Map env) throws SQLException
{
Boolean result = null;
Comparable leftValue = (Comparable)left.eval(env);
Comparable rightValue = (Comparable)right.eval(env);
Integer leftComparedToRightObj = compare(leftValue, rightValue, env);
if (leftComparedToRightObj != null)
{
int leftComparedToRight = leftComparedToRightObj.intValue();
if (leftValue != null && rightValue != null)
{
if (op.equals("="))
{
result = Boolean.valueOf(leftComparedToRight == 0);
}
else if (op.equals("<>") || op.equals("!="))
{
result = Boolean.valueOf(leftComparedToRight != 0);
}
else if (op.equals(">"))
{
result = Boolean.valueOf(leftComparedToRight>0);
}
else if (op.equals("<"))
{
result = Boolean.valueOf(leftComparedToRight<0);
}
else if (op.equals("<=") || op.equals("=<"))
{
result = Boolean.valueOf(leftComparedToRight <= 0);
}
else if (op.equals(">=") || op.equals("=>"))
{
result = Boolean.valueOf(leftComparedToRight >= 0);
}
}
}
return result;
}
public static Integer compare(Comparable leftValue,
Comparable rightValue, Map env) throws SQLException
{
Integer leftComparedToRightObj = null;
try
{
if (leftValue != null && rightValue != null)
leftComparedToRightObj = new Integer(leftValue.compareTo(rightValue));
}
catch (ClassCastException e)
{
}
try
{
if (leftComparedToRightObj == null)
{
if (leftValue == null || rightValue == null)
{
/*
* Do nothing. Anything compared with NULL is false.
*/
}
else if (leftValue instanceof Date)
{
Expression stringConverter = new ColumnName(StringConverter.COLUMN_NAME);
StringConverter sc = (StringConverter) stringConverter.eval(env);
Date date = sc.parseDate(rightValue.toString());
if (date != null)
leftComparedToRightObj = new Integer(leftValue.compareTo(date));
}
else if (rightValue instanceof Date)
{
Expression stringConverter = new ColumnName(StringConverter.COLUMN_NAME);
StringConverter sc = (StringConverter) stringConverter.eval(env);
Date date = sc.parseDate(leftValue.toString());
if (date != null)
leftComparedToRightObj = new Integer(date.compareTo((Date)rightValue));
}
else if (leftValue instanceof Time)
{
Expression stringConverter = new ColumnName(StringConverter.COLUMN_NAME);
StringConverter sc = (StringConverter) stringConverter.eval(env);
Time time = sc.parseTime(rightValue.toString());
if (time != null)
leftComparedToRightObj = new Integer(leftValue.compareTo(time));
}
else if (rightValue instanceof Time)
{
Expression stringConverter = new ColumnName(StringConverter.COLUMN_NAME);
StringConverter sc = (StringConverter) stringConverter.eval(env);
Time time = sc.parseTime(leftValue.toString());
if (time != null)
leftComparedToRightObj = new Integer(time.compareTo((Time)rightValue));
}
else if (leftValue instanceof Timestamp)
{
Expression stringConverter = new ColumnName(StringConverter.COLUMN_NAME);
StringConverter sc = (StringConverter) stringConverter.eval(env);
Timestamp timestamp = sc.parseTimestamp(rightValue.toString());
if (timestamp != null)
leftComparedToRightObj = new Integer(leftValue.compareTo(timestamp));
}
else if (rightValue instanceof Timestamp)
{
Expression stringConverter = new ColumnName(StringConverter.COLUMN_NAME);
StringConverter sc = (StringConverter) stringConverter.eval(env);
Timestamp timestamp = sc.parseTimestamp(leftValue.toString());
if (timestamp != null)
leftComparedToRightObj = new Integer(timestamp.compareTo((Timestamp)rightValue));
}
else if (leftValue instanceof Boolean)
{
Boolean leftBoolean = (Boolean)leftValue;
Boolean rightBoolean = Boolean.valueOf(rightValue.toString());
// false (0) is less than true (1) in Boolean algebra
if (leftBoolean.equals(rightBoolean))
leftComparedToRightObj = Integer.valueOf(0);
else if (leftBoolean.booleanValue() == false)
leftComparedToRightObj = Integer.valueOf(-1);
else
leftComparedToRightObj = Integer.valueOf(1);
}
else
{
Double leftDouble = new Double(((Number)leftValue).toString());
Double rightDouble = new Double(((Number)rightValue).toString());
leftComparedToRightObj = new Integer(leftDouble.compareTo(rightDouble));
}
}
}
catch (ClassCastException e)
{
}
catch (NumberFormatException e)
{
}
return leftComparedToRightObj;
}
public String toString()
{
return op+" "+left+" "+right;
}
public List usedColumns(Set availableColumns)
{
List result = new LinkedList();
result.addAll(left.usedColumns(availableColumns));
result.addAll(right.usedColumns(availableColumns));
return result;
}
public List aggregateFunctions()
{
List result = new LinkedList();
result.addAll(left.aggregateFunctions());
result.addAll(right.aggregateFunctions());
return result;
}
public boolean isValid()
{
return isValid;
}
}