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The GraalVM compiler and the Graal-truffle optimizer.

There is a newer version: 24.2.1

/*
 * Copyright (c) 2020, 2024, 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
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 */
package jdk.graal.compiler.graphio.parsing.model;

/**
 * Boilerplate for items that inform the document owner about changes.
 *
 * @author sdedic
 */
abstract class AbstractMutableDocumentItem>
                extends Properties.Entity implements FolderElement, Properties.MutableOwner {
    private boolean writable;

    protected AbstractMutableDocumentItem() {
        super();
    }

    protected AbstractMutableDocumentItem(Properties properties) {
        super(properties);
    }

    @Override
    public synchronized Properties writableProperties() {
        if (writable) {
            return super.getProperties();
        }
        return Properties.newProperties(super.getProperties());
    }

    @Override
    public void updateProperties(Properties props) {
        GraphDocument owner = getOwner();
        synchronized (this) {
            writable = true;
            replaceProperties(props);
        }
        if (owner == null) {
            return;
        }
        owner.notifyPropertiesChanged(this, props);
        getPropertyChangedEvent().fire();
    }
}