1 /*

     2  * Copyright 1994-2003 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    25 

    26 package sun.tools.tree;

    27 

    28 import sun.tools.java.*;

    29 import java.util.Hashtable;

    30 

    31 /**

    32  * Parenthesised expressions.

    33  *

    34  * WARNING: The contents of this source file are not part of any

    35  * supported API.  Code that depends on them does so at its own risk:

    36  * they are subject to change or removal without notice.

    37  */

    38 

    39 public

    40 class ExprExpression extends UnaryExpression {

    41     /**

    42      * Constructor

    43      */

    44     public ExprExpression(long where, Expression right) {

    45         super(EXPR, where, right.type, right);

    46     }

    47 

    48     /**

    49      * Check a condition.  We must pass it on to our unparenthesised form.

    50      */

    51     public void checkCondition(Environment env, Context ctx, Vset vset,

    52                                Hashtable exp, ConditionVars cvars) {

    53         right.checkCondition(env, ctx, vset, exp, cvars);

    54         type = right.type;

    55     }

    56 

    57     /**

    58      * Check the expression if it appears as an lvalue.

    59      * We just pass it on to our unparenthesized subexpression.

    60      * (Part of fix for 4090372)

    61      */

    62     public Vset checkAssignOp(Environment env, Context ctx,

    63                               Vset vset, Hashtable exp, Expression outside) {

    64         vset = right.checkAssignOp(env, ctx, vset, exp, outside);

    65         type = right.type;

    66         return vset;

    67     }

    68 

    69     /**

    70      * Delegate to our subexpression.

    71      * (Part of fix for 4090372)

    72      */

    73     public FieldUpdater getUpdater(Environment env, Context ctx) {

    74         return right.getUpdater(env, ctx);

    75     }

    76 

    77     // Allow (x) = 9;

    78     //

    79     // I will hold off on this until I'm sure about it.  Nobody's

    80     // going to clammer for this one.

    81     //

    82     // public Vset checkLHS(Environment env, Context ctx,

    83     //     Vset vset, Hashtable exp) {

    84     //     vset = right.check(env, ctx, vset, exp);

    85     //     type = right.type;

    86     //     return vset;

    87     // }

    88 

    89     public boolean isNull() {

    90         return right.isNull();

    91     }

    92 

    93     public boolean isNonNull() {

    94         return right.isNonNull();

    95     }

    96 

    97     // Probably not necessary

    98     public Object getValue() {

    99         return right.getValue();

   100     }

   101 

   102     /**

   103      * Delegate to our subexpression.

   104      * See the comment in AddExpression#inlineValueSB() for

   105      * information about this method.

   106      */

   107     protected StringBuffer inlineValueSB(Environment env,

   108                                          Context ctx,

   109                                          StringBuffer buffer) {

   110         return right.inlineValueSB(env, ctx, buffer);

   111     }

   112 

   113     /**

   114      * Select the type of the expression

   115      */

   116     void selectType(Environment env, Context ctx, int tm) {

   117         type = right.type;

   118     }

   119 

   120     /**

   121      * Simplify

   122      */

   123     Expression simplify() {

   124         return right;

   125     }

   126 }