/**********************************************************************
Copyright (c) 2002 Kelly Grizzle (TJDO) and others. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
Contributors:
2002 Mike Martin (TJDO)
2003 Andy Jefferson - coding standards
...
**********************************************************************/
package org.jpox.store.mapped.expression;
import org.jpox.store.mapped.mapping.JavaTypeMapping;
import org.jpox.store.mapped.query.StatementText;
/**
* Representation of a BooleanChar column expression.
*
* @version $Revision: 1.10 $
**/
public class BooleanCharColumnExpression extends BooleanExpression
{
private boolean truthTest;
private StatementText booleanCondition = new StatementText();
/**
* Constructor. Perform a positive truth test("<i>this</i> = 1").
* @param qs the QueryExpression
* @param mapping the mapping associated to this expression
* @param te the TableExpression where this expression refers to
*/
public BooleanCharColumnExpression(QueryExpression qs, JavaTypeMapping mapping, LogicSetExpression te)
{
this(qs, mapping, te, true);
}
/**
* Constructor. Perform a truth test
* @param qs the QueryExpression
* @param mapping the mapping associated to this expression
* @param te the TableExpression where this expression refers to
* @param truthTest true for positive ("<i>this</i> = 1"), 0 for negative ("<i>this</i> = 0")
*/
public BooleanCharColumnExpression(QueryExpression qs, JavaTypeMapping mapping, LogicSetExpression te, boolean truthTest)
{
super(qs, mapping, te);
this.truthTest = truthTest;
booleanCondition.append(" = ").append(new BooleanCharColumnLiteral(qs, mapping, truthTest));
lowestOperator = OP_EQ;
}
public BooleanExpression not()
{
return new BooleanCharColumnExpression(qs, mapping, te, !truthTest);
}
public BooleanExpression eq(ScalarExpression expr)
{
if (expr instanceof NullLiteral)
{
return expr.eq(new CharacterExpression(qs, mapping, te));
}
else if (expr instanceof BooleanCharColumnExpression)
{
return new BooleanExpression(new CharacterExpression(qs, mapping, te),
OP_EQ,
new CharacterExpression(qs, expr.mapping, expr.te));
}
else
{
return super.eq(expr);
}
}
public BooleanExpression noteq(ScalarExpression expr)
{
if (expr instanceof NullLiteral)
{
return expr.noteq(new CharacterExpression(qs, mapping, te));
}
else if (expr instanceof BooleanCharColumnExpression)
{
return new BooleanExpression(new CharacterExpression(qs, mapping, te),
OP_NOTEQ,
new CharacterExpression(qs, expr.mapping, expr.te));
}
else
{
return super.noteq(expr);
}
}
public BooleanExpression in(ScalarExpression expr)
{
return new BooleanExpression(new CharacterExpression(qs, mapping, te), OP_IN, expr);
}
public StatementText toStatementText(int mode)
{
StatementText st = super.toStatementText(mode);
if( mode == ScalarExpression.FILTER )
{
st.append(booleanCondition,mode);
}
return st;
}
}