/* | |
* Copyright 1994-2003 Sun Microsystems, Inc. All Rights Reserved. | |
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
* | |
* This code is free software; you can redistribute it and/or modify it | |
* under the terms of the GNU General Public License version 2 only, as | |
* published by the Free Software Foundation. Sun designates this | |
* particular file as subject to the "Classpath" exception as provided | |
* by Sun in the LICENSE file that accompanied this code. | |
* | |
* This code is distributed in the hope that it will be useful, but WITHOUT | |
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
* version 2 for more details (a copy is included in the LICENSE file that | |
* accompanied this code). | |
* | |
* You should have received a copy of the GNU General Public License version | |
* 2 along with this work; if not, write to the Free Software Foundation, | |
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
* | |
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
* CA 95054 USA or visit www.sun.com if you need additional information or | |
* have any questions. | |
*/ | |
package sun.tools.tree; | |
import sun.tools.java.*; | |
import sun.tools.asm.Assembler; | |
import java.io.PrintStream; | |
/** | |
* WARNING: The contents of this source file are not part of any | |
* supported API. Code that depends on them does so at its own risk: | |
* they are subject to change or removal without notice. | |
*/ | |
public | |
class NullExpression extends ConstantExpression { | |
/** | |
* Constructor | |
*/ | |
public NullExpression(long where) { | |
super(NULL, where, Type.tNull); | |
} | |
/** | |
* Check if the expression is equal to a value | |
*/ | |
public boolean equals(int i) { | |
return i == 0; | |
} | |
public boolean isNull() { | |
return true; | |
} | |
/** | |
* Code | |
*/ | |
public void codeValue(Environment env, Context ctx, Assembler asm) { | |
asm.add(where, opc_aconst_null); | |
} | |
/** | |
*/ | |
public void print(PrintStream out) { | |
out.print("null"); | |
} | |
} |