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/*******************************************************************************
* Copyright (c) 2006 Oracle Corporation.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Cameron Bateman/Oracle - initial API and implementation
*
********************************************************************************/
package org.eclipse.jst.jsf.validation.internal.el.operators;
import org.eclipse.emf.common.util.Diagnostic;
import org.eclipse.jst.jsf.common.internal.types.BooleanLiteralType;
import org.eclipse.jst.jsf.common.internal.types.LiteralType;
import org.eclipse.jst.jsf.common.internal.types.TypeCoercer;
import org.eclipse.jst.jsf.common.internal.types.TypeCoercionException;
import org.eclipse.jst.jsf.common.internal.types.TypeConstants;
import org.eclipse.jst.jsf.common.internal.types.TypeTransformer;
import org.eclipse.jst.jsf.common.internal.types.ValueType;
import org.eclipse.jst.jsf.validation.internal.el.diagnostics.DiagnosticFactory;
/**
* Represents te EL unary operators "!" and "not" on a ValueType
* as described by JSP.2.3.6.2
*
* @author cbateman
*
*/
/*package*/ class NotUnaryOperator extends UnaryOperator
{
NotUnaryOperator(DiagnosticFactory diagnosticFactory)
{
super(diagnosticFactory);
}
public Diagnostic validate(ValueType type)
{
if (TypeConstants.TYPE_JAVAOBJECT.equals(type.getSignature())) {
return Diagnostic.OK_INSTANCE;
}
boolean canCoerce =
TypeCoercer.canCoerceToBoolean(TypeTransformer.transformBoxPrimitives(type.getSignature()));
if (canCoerce)
{
// check for constant evaluation
if (type instanceof LiteralType)
{
try
{
Boolean coercedValue = ((LiteralType)type).coerceToBoolean();
// we are logically notting, so coerced is true, then false
// if false then true
return _diagnosticFactory.create_UNARY_OP_CONSTANT_EXPRESSION_EVAL_SAME_ID(
"not" //$NON-NLS-1$
, Boolean.valueOf(!coercedValue.booleanValue()).toString());
}
catch (TypeCoercionException tce)
{
throw new AssertionError("coerce should not throw exception"); //$NON-NLS-1$
}
}
return Diagnostic.OK_INSTANCE;
}
return _diagnosticFactory.create_UNARY_OP_CANNOT_COERCE_ARGUMENT_TO_BOOLEAN();
}
public ValueType performOperation(ValueType type)
{
boolean canCoerce =
TypeCoercer.canCoerceToBoolean(TypeTransformer.transformBoxPrimitives(type.getSignature()));
if (canCoerce)
{
if (type instanceof LiteralType)
{
try
{
Boolean coercedValue = ((LiteralType)type).coerceToBoolean();
// we are logically notting, so coerced is true, then false
// if false then true
return
coercedValue.booleanValue() ?
BooleanLiteralType.FALSE :
BooleanLiteralType.TRUE;
}
catch (TypeCoercionException tce)
{
throw new AssertionError("coerce should not throw exception"); //$NON-NLS-1$
}
}
return new ValueType(TypeConstants.TYPE_BOOLEAN, type.getAssignability());
}
return null;
}
}
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