1/*
2 * Copyright (c) 1994, 2003, Oracle and/or its affiliates. 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.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package sun.tools.tree;
27
28import sun.tools.java.*;
29import java.util.Hashtable;
30
31/**
32 * WARNING: The contents of this source file are not part of any
33 * supported API.  Code that depends on them does so at its own risk:
34 * they are subject to change or removal without notice.
35 */
36abstract public
37class BinaryLogicalExpression extends BinaryExpression {
38    /**
39     * constructor
40     */
41    public BinaryLogicalExpression(int op, long where, Expression left, Expression right) {
42        super(op, where, Type.tBoolean, left, right);
43    }
44
45    /**
46     * Check a binary expression
47     */
48    public Vset checkValue(Environment env, Context ctx,
49                           Vset vset, Hashtable<Object, Object> exp) {
50        ConditionVars cvars = new ConditionVars();
51        // evaluate the logical expression, determining which variables are
52        // set if the resulting value is true or false
53        checkCondition(env, ctx, vset, exp, cvars);
54        // return the intersection.
55        return cvars.vsTrue.join(cvars.vsFalse);
56    }
57
58    /*
59     * Every subclass of this class must define a genuine implementation
60     * of this method.  It cannot inherit the method of Expression.
61     */
62    abstract
63    public void checkCondition(Environment env, Context ctx, Vset vset,
64                               Hashtable<Object, Object> exp, ConditionVars cvars);
65
66
67    /**
68     * Inline
69     */
70    public Expression inline(Environment env, Context ctx) {
71        left = left.inlineValue(env, ctx);
72        right = right.inlineValue(env, ctx);
73        return this;
74    }
75}
76