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Truffle is a multi-language framework for executing dynamic languages that achieves high performance when combined with Graal.

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/*
 * Copyright (c) 2013, 2016, 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 com.oracle.truffle.api.source;

import java.lang.ref.WeakReference;
import java.util.Objects;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;

final class SourceImpl extends Source implements Cloneable {
    private static Ref SOURCES = null;

    SourceImpl(Content content) {
        super(content);
        registerSource(this);
    }

    @Override
    protected SourceImpl clone() throws CloneNotSupportedException {
        SourceImpl clone = (SourceImpl) super.clone();
        registerSource(clone);
        return clone;
    }

    static synchronized void registerSource(SourceImpl source) {
        SOURCES = new Ref(source, SOURCES);
    }

    static synchronized Source findSource(String name) {
        Ref prev = null;
        Ref now = SOURCES;
        while (now != null) {
            SourceImpl source = now.get();
            if (source == null) {
                if (prev == null) {
                    SOURCES = now.next;
                } else {
                    prev.next = now.next;
                }
            } else {
                prev = now;
                if (Objects.equals(source.getName(), name)) {
                    return source;
                }
            }
            now = now.next;
        }
        return null;
    }

    @TruffleBoundary
    @Override
    public boolean equals(Object obj) {
        if (obj instanceof Source) {
            Source other = (Source) obj;
            return content().equals(other.content()) && equalAttributes(other);
        }
        return false;
    }

    @Override
    public int hashCode() {
        return content().hashCode();
    }

    private static final class Ref extends WeakReference {
        Ref next;

        Ref(SourceImpl source, Ref next) {
            super(source);
            this.next = next;
        }
    }
}