/**
* Checks if the assignment needs a downcast and inserts it if necessary
*
* @param expression the right hand-side
* @param expressionType the type of the right hand-side. Can be null
* @param ast the AST
* @param variableType the Type of the variable the expression will be assigned to
* @param is50OrHigher if <code>true</code> java 5.0 code will be assumed
* @return the casted expression if necessary
*/
private static Expression createNarrowCastIfNessecary(
Expression expression,
ITypeBinding expressionType,
AST ast,
ITypeBinding variableType,
boolean is50OrHigher) {
PrimitiveType castTo = null;
if (variableType.isEqualTo(expressionType)) return expression; // no cast for same type
if (is50OrHigher) {
if (ast.resolveWellKnownType("java.lang.Character").isEqualTo(variableType)) // $NON-NLS-1$
castTo = ast.newPrimitiveType(PrimitiveType.CHAR);
if (ast.resolveWellKnownType("java.lang.Byte").isEqualTo(variableType)) // $NON-NLS-1$
castTo = ast.newPrimitiveType(PrimitiveType.BYTE);
if (ast.resolveWellKnownType("java.lang.Short").isEqualTo(variableType)) // $NON-NLS-1$
castTo = ast.newPrimitiveType(PrimitiveType.SHORT);
}
if (ast.resolveWellKnownType("char").isEqualTo(variableType)) // $NON-NLS-1$
castTo = ast.newPrimitiveType(PrimitiveType.CHAR);
if (ast.resolveWellKnownType("byte").isEqualTo(variableType)) // $NON-NLS-1$
castTo = ast.newPrimitiveType(PrimitiveType.BYTE);
if (ast.resolveWellKnownType("short").isEqualTo(variableType)) // $NON-NLS-1$
castTo = ast.newPrimitiveType(PrimitiveType.SHORT);
if (castTo != null) {
CastExpression cast = ast.newCastExpression();
if (ASTNodes.needsParentheses(expression)) {
ParenthesizedExpression parenthesized = ast.newParenthesizedExpression();
parenthesized.setExpression(expression);
cast.setExpression(parenthesized);
} else cast.setExpression(expression);
cast.setType(castTo);
return cast;
}
return expression;
}
public CastExpression newCast(Type type, Expression expr) {
CastExpression cast = ast.newCastExpression();
cast.setExpression(expr);
cast.setType(type);
return cast;
}
/**
* Builds a new {@link CastExpression} instance.
*
* @param typeName the name of the type being cast to
* @param expr the expression being cast
* @return a new CastExpression
*/
public CastExpression cast(String typeName, Expression expr) {
final CastExpression ce = ast.newCastExpression();
ce.setType(type(typeName));
ce.setExpression(expr);
return ce;
}