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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, 2018, 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;

/**
 * Wrapper to enforce CharSequence contract is not violated by any language.
 */
class CharSequenceWrapper implements CharSequence {

    private final CharSequence delegate;

    CharSequenceWrapper(CharSequence delegate) {
        this.delegate = delegate;
    }

    public int length() {
        return delegate.length();
    }

    public char charAt(int index) {
        return delegate.charAt(index);
    }

    public CharSequence subSequence(int start, int end) {
        return delegate.subSequence(start, end);
    }

    @Override
    public boolean equals(Object obj) {
        if (obj instanceof CharSequenceWrapper) {
            return delegate.equals(((CharSequenceWrapper) obj).delegate);
        } else {
            return delegate.equals(obj);
        }
    }

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

    @Override
    public String toString() {
        return delegate.toString();
    }
}