aoqi@0: /*
aoqi@0:  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.  Oracle designates this
aoqi@0:  * particular file as subject to the "Classpath" exception as provided
aoqi@0:  * by Oracle in the LICENSE file that accompanied this code.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: /* FROM mail.jar */
aoqi@0: package com.sun.xml.internal.org.jvnet.mimepull;
aoqi@0: 
aoqi@0: import java.util.*;
aoqi@0: 
aoqi@0: /**
aoqi@0:  * Utilities to make it easier to get property values.
aoqi@0:  * Properties can be strings or type-specific value objects.
aoqi@0:  *
aoqi@0:  * @author Bill Shannon
aoqi@0:  */
aoqi@0: final class PropUtil {
aoqi@0: 
aoqi@0:     // No one should instantiate this class.
aoqi@0:     private PropUtil() {
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Get a boolean valued System property.
aoqi@0:      */
aoqi@0:     public static boolean getBooleanSystemProperty(String name, boolean def) {
aoqi@0:         try {
aoqi@0:             return getBoolean(getProp(System.getProperties(), name), def);
aoqi@0:         } catch (SecurityException sex) {
aoqi@0:             // fall through...
aoqi@0:         }
aoqi@0: 
aoqi@0:         /*
aoqi@0:          * If we can't get the entire System Properties object because
aoqi@0:          * of a SecurityException, just ask for the specific property.
aoqi@0:          */
aoqi@0:         try {
aoqi@0:             String value = System.getProperty(name);
aoqi@0:             if (value == null) {
aoqi@0:                 return def;
aoqi@0:             }
aoqi@0:             if (def) {
aoqi@0:                 return !value.equalsIgnoreCase("false");
aoqi@0:             } else {
aoqi@0:                 return value.equalsIgnoreCase("true");
aoqi@0:             }
aoqi@0:         } catch (SecurityException sex) {
aoqi@0:             return def;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Get the value of the specified property.
aoqi@0:      * If the "get" method returns null, use the getProperty method,
aoqi@0:      * which might cascade to a default Properties object.
aoqi@0:      */
aoqi@0:     private static Object getProp(Properties props, String name) {
aoqi@0:         Object val = props.get(name);
aoqi@0:         if (val != null) {
aoqi@0:             return val;
aoqi@0:         } else {
aoqi@0:             return props.getProperty(name);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Interpret the value object as a boolean,
aoqi@0:      * returning def if unable.
aoqi@0:      */
aoqi@0:     private static boolean getBoolean(Object value, boolean def) {
aoqi@0:         if (value == null) {
aoqi@0:             return def;
aoqi@0:         }
aoqi@0:         if (value instanceof String) {
aoqi@0:             /*
aoqi@0:              * If the default is true, only "false" turns it off.
aoqi@0:              * If the default is false, only "true" turns it on.
aoqi@0:              */
aoqi@0:             if (def) {
aoqi@0:                 return !((String)value).equalsIgnoreCase("false");
aoqi@0:             } else {
aoqi@0:                 return ((String)value).equalsIgnoreCase("true");
aoqi@0:             }
aoqi@0:         }
aoqi@0:         if (value instanceof Boolean) {
aoqi@0:             return ((Boolean)value).booleanValue();
aoqi@0:         }
aoqi@0:         return def;
aoqi@0:     }
aoqi@0: }