/*
 * Copyright (c) 2014, 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.
 *
 * 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 com.oracle.graal.api.replacements;

/**
 * Guards the installation of substitutions for {@link ClassSubstitution} and
 * {@link MethodSubstitution}.
 * <p>
 * Implementor must have a single public constructor with one of the following signatures:
 * <ul>
 * <li>{@code Guard(Architecture)}</li>
 * <li>{@code Guard()} (an implicit constructor is OK as well)</li>
 * </ul>
 */
public interface SubstitutionGuard {

    /**
     * Return true if the substitution should be enabled.
     */
    boolean execute();
}