/*

 * Copyright (c) 1994, 2003, Oracle and/or its affiliates. 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.  Oracle designates this

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

 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.tools.tree;

import sun.tools.java.*;

import java.util.Hashtable;

/**

 * 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.

 */

abstract public

class BinaryLogicalExpression extends BinaryExpression {

    /**

     * constructor

     */

    public BinaryLogicalExpression(int op, long where, Expression left, Expression right) {

        super(op, where, Type.tBoolean, left, right);

    }

    /**

     * Check a binary expression

     */

    public Vset checkValue(Environment env, Context ctx,

                           Vset vset, Hashtable exp) {

        ConditionVars cvars = new ConditionVars();

        // evaluate the logical expression, determining which variables are

        // set if the resulting value is true or false

        checkCondition(env, ctx, vset, exp, cvars);

        // return the intersection.

        return cvars.vsTrue.join(cvars.vsFalse);

    }

    /*

     * Every subclass of this class must define a genuine implementation

     * of this method.  It cannot inherit the method of Expression.

     */

    abstract

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

                               Hashtable exp, ConditionVars cvars);

    /**

     * Inline

     */

    public Expression inline(Environment env, Context ctx) {

        left = left.inlineValue(env, ctx);

        right = right.inlineValue(env, ctx);

        return this;

    }

}