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96 lines
2.5 KiB
96 lines
2.5 KiB
/* CheckNullOperator Copyright (C) 1999-2002 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 Lesser 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 Lesser General Public License
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* along with this program; see the file COPYING.LESSER. 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.LocalInfo;
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import net.sf.jode.decompiler.TabbedPrintWriter;
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///#def COLLECTIONS java.util
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import java.util.Collection;
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///#enddef
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/**
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* This is a pseudo operator, which represents the check against null
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* that jikes and javac generates for inner classes:
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*
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* <pre>
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* outer.new Inner()
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* </pre>
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* is translated by javac to
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* <pre>
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* new Outer$Inner(outer ((void) DUP.getClass()));
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* </pre>
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* and by jikes to
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* <pre>
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* new Outer$Inner(outer (DUP == null ? throw null));
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* </pre>
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*/
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public class CheckNullOperator extends Operator {
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LocalInfo local;
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public CheckNullOperator(Type type, LocalInfo li) {
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super(type, 0);
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local = li;
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initOperands(1);
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}
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public int getPriority() {
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return 200;
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}
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public void updateSubTypes() {
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local.setType(type);
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subExpressions[0].setType(Type.tSubType(type));
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}
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public void updateType() {
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Type newType = Type.tSuperType(subExpressions[0].getType())
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.intersection(type);
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local.setType(newType);
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updateParentType(newType);
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}
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public void removeLocal() {
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local.remove();
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}
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public void fillInGenSet(Collection in, Collection gen) {
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if (gen != null)
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gen.add(local);
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super.fillInGenSet(in, gen);
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}
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public void fillDeclarables(Collection used) {
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used.add(local);
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super.fillDeclarables(used);
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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("("+local.getName()+" = ");
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subExpressions[0].dumpExpression(writer, 0);
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writer.print(").getClass() != null ? "+local.getName()+" : null");
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}
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public boolean opEquals(Operator o) {
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return o instanceof CheckNullOperator;
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}
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}
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