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74 lines
2.2 KiB
74 lines
2.2 KiB
/* CheckCastOperator Copyright (C) 1998-1999 Jochen Hoenicke.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id$
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*/
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package net.sf.jode.expr;
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import net.sf.jode.type.Type;
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import net.sf.jode.decompiler.TabbedPrintWriter;
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public class CheckCastOperator extends Operator {
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Type castType;
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public CheckCastOperator(Type type) {
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super(type, 0);
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castType = type;
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initOperands(1);
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}
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public int getPriority() {
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return 700;
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}
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public void updateSubTypes() {
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subExpressions[0].setType(Type.tUObject);
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}
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public void updateType() {
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}
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public Expression simplify() {
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if (subExpressions[0].getType().getCanonic()
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.isOfType(Type.tSubType(castType)))
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/* This is an unnecessary widening cast, probably that inserted
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* by jikes for inner classes constructors.
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*/
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return subExpressions[0].simplify();
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return super.simplify();
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}
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public void dumpExpression(TabbedPrintWriter writer)
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throws java.io.IOException {
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writer.print("(");
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writer.printType(castType);
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writer.print(") ");
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writer.breakOp();
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/* There are special cases where a cast isn't allowed. We must cast
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* to the common super type before. This cases always give a runtime
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* error, but we want to decompile even bad programs.
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*/
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Type superType = castType.getCastHelper(subExpressions[0].getType());
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if (superType != null) {
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writer.print("(");
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writer.printType(superType);
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writer.print(") ");
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writer.breakOp();
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}
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subExpressions[0].dumpExpression(writer, 700);
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}
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}
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