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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
 * portions of the Software.
 *
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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package com.oracle.js.parser;

Manages global runtime options.
/**
 * Manages global runtime options.
 */
final class Options {
    private static final String OPTION_NAME_PREFIX = "truffle.js.";

    private Options() {
        // should not be constructed
    }

    
Convenience function for getting system properties in a safe way.
Params:
name – of boolean property
defValue – default value of boolean property
Returns:
true if set to true, default value if unset or set to false/**
     * Convenience function for getting system properties in a safe way.
     *
     * @param name of boolean property
     * @param defValue default value of boolean property
     * @return true if set to true, default value if unset or set to false
     */
    public static boolean getBooleanProperty(final String name, final Boolean defValue) {
        try {
            final String property = System.getProperty(OPTION_NAME_PREFIX + name);
            if (property == null && defValue != null) {
                return defValue;
            }
            return property != null && !"false".equalsIgnoreCase(property);
        } catch (final SecurityException e) {
            // if no permission to read, assume false
            return false;
        }
    }

    
Convenience function for getting system properties in a safe way.
Params:
name – of boolean property
Returns:
true if set to true, false if unset or set to false/**
     * Convenience function for getting system properties in a safe way.
     *
     * @param name of boolean property
     * @return true if set to true, false if unset or set to false
     */
    public static boolean getBooleanProperty(final String name) {
        return getBooleanProperty(name, null);
    }
}