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/***** BEGIN LICENSE BLOCK *****
 * Version: CPL 1.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Common Public
 * License Version 1.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.eclipse.org/legal/cpl-v10.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2009 JRuby project
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the CPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
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 ***** END LICENSE BLOCK *****/

package org.jruby.ext.ffi.jffi;

import org.jruby.Ruby;
import org.jruby.ext.ffi.DirectMemoryIO;
import org.jruby.ext.ffi.InvalidMemoryIO;
import org.jruby.ext.ffi.Pointer;

/**
 * Representation of code (executable) memory blocks
 */
public final class CodeMemoryIO extends InvalidMemoryIO implements DirectMemoryIO {
    private final Pointer pointer;
    private final long address;

    public CodeMemoryIO(Ruby runtime, long address) {
        super(runtime, "code region is inaccessible");
        this.pointer = null;
        this.address = address;
    }

    public CodeMemoryIO(Ruby runtime, Pointer pointer) {
        super(runtime, "code region is inaccessible");
        this.pointer = pointer;
        this.address = pointer.getAddress();
    }

    public long getAddress() {
        return address;
    }

    public boolean isDirect() {
        return true;
    }

    public boolean isNull() {
        return address == 0;
    }
}