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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.

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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.javascript.regexp;

/** A utility class for lazily instantiated substrings. */
public class SubString {

    public SubString() {}

    public SubString(String str) {
        this.str = str;
        index = 0;
        length = str.length();
    }

    public SubString(String source, int start, int len) {
        str = source;
        index = start;
        length = len;
    }

    @Override
    public String toString() {
        return str == null ? "" : str.substring(index, index + length);
    }

    String str;
    int index;
    int length;
}