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