author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 14 Sep 2010 21:06:50 +0300 | |
branch | RCL_3 |
changeset 71 | d5e927d5853b |
parent 66 | 2455ef1f5bbc |
child 83 | 26b2b12093af |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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|
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|
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package com.nokia.mj.impl.rt; |
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|
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import java.util.Hashtable; |
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import com.nokia.mj.impl.rt.support.SystemPropertyProvider; |
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import com.nokia.mj.impl.utils.Logger; |
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|
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/** |
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* A class that will be used to store system properties in CLDC VM. |
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* The class is inherited from Hashtable and there will be only one instance |
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* of it per VM instance. The VM will replace the original Hashtable with |
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* instace of this object which gives us the control when MIDlet is asking |
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* for any system property. Original system properties are in the private |
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* member and the parent hash table is used to store dynamic handlers. |
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* |
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* @author Nokia Corporation |
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* @version 1.0 |
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*/ |
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|
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class SystemPropertyUtils |
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{ |
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|
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private static final String |
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PROPERTY_HANDLER_CLASS_PREFIX = "com.nokia.mj.impl.properties."; |
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|
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/** |
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* Solves the possible dynamic property value. This a utility method |
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* to be called by VM dependent sytem properties extension mechanism. |
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* |
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* The utility will check if the value of the system property indicates |
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* that the method is dynamic. if it is not, then the value is returned |
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* directly, but if it is, then the value of the dynamic property will |
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* be solved by using defined property handler. |
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* |
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* @param propertyName the name of the system property. |
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* @param propertyValue the value of the system property. This must be |
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* passed as an argument even if the original |
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* Hashtable is also passed as third argument. |
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* That can't be used because calling the get method |
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* of the given Hashtable would lead to forever loop. |
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* @param props A hashtable containing the system properties. This is used |
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* to store the "freezed" system property value. |
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* @return value of the system property. |
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*/ |
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public static Object solvePropertyValue(Object propertyName, |
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Object propertyValue, |
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Hashtable systemProperties) |
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{ |
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// Check that the property name and the obtained value are strings |
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if (!(propertyName instanceof String) || |
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!(propertyValue instanceof String)) |
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{ |
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// Not strings, return the non-string property value. |
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return propertyValue; |
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} |
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|
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String propertyNameStr = (String)propertyName; |
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String propertyValueStr = (String)propertyValue; |
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try |
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{ |
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// If the property value starts with ':' it is a dynamic property |
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if (propertyValueStr != null && propertyValueStr.length() > 0 && |
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propertyValueStr.charAt(0) == ':') |
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{ |
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// Note for CDC. If some application wants to define some system |
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// property value that starts with ':' then it is needed to |
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// encode e.g. by using leading ':'. |
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if (propertyValueStr.length() > 1 && |
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propertyValueStr.charAt(1) == ':') |
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{ |
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return propertyValueStr.substring(1); |
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} |
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|
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// Strip the dynamic property prefix away. |
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final String classEnding = propertyValueStr.substring(1); |
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// The result will be the end of the package and of |
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// the class name. |
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String className = PROPERTY_HANDLER_CLASS_PREFIX + |
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classEnding; |
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|
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try |
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{ |
71
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Revision: v2.2.11
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101 |
Class clazz = Class.forName(className); |
19
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Revision: v2.1.22
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102 |
Object providerImpl = clazz.newInstance(); |
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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103 |
|
04becd199f91
Revision: v2.1.22
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104 |
boolean isFrozen = false; |
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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105 |
SystemPropertyProvider systemPropertyProvider = |
04becd199f91
Revision: v2.1.22
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106 |
(SystemPropertyProvider)providerImpl; |
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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107 |
|
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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108 |
propertyValueStr = |
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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109 |
systemPropertyProvider.getProperty(propertyNameStr); |
04becd199f91
Revision: v2.1.22
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110 |
|
04becd199f91
Revision: v2.1.22
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111 |
isFrozen = |
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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112 |
systemPropertyProvider.isStatic(propertyNameStr); |
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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113 |
|
04becd199f91
Revision: v2.1.22
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114 |
// Freeze the value if the provider wants so |
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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115 |
if (propertyValueStr != null && isFrozen) |
04becd199f91
Revision: v2.1.22
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116 |
{ |
04becd199f91
Revision: v2.1.22
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117 |
systemProperties.put(propertyNameStr, |
04becd199f91
Revision: v2.1.22
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118 |
propertyValueStr); |
04becd199f91
Revision: v2.1.22
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119 |
} |
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Revision: v2.1.22
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120 |
return propertyValueStr; |
04becd199f91
Revision: v2.1.22
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121 |
} |
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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122 |
catch (ClassNotFoundException e) |
04becd199f91
Revision: v2.1.22
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123 |
{ |
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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124 |
Logger.ELOG(Logger.EUtils, "Dynamic property handler " + |
04becd199f91
Revision: v2.1.22
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125 |
className + " was not found for " |
04becd199f91
Revision: v2.1.22
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126 |
+ propertyName); |
04becd199f91
Revision: v2.1.22
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127 |
return ""; |
04becd199f91
Revision: v2.1.22
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128 |
} |
04becd199f91
Revision: v2.1.22
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129 |
|
04becd199f91
Revision: v2.1.22
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130 |
} |
04becd199f91
Revision: v2.1.22
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131 |
|
04becd199f91
Revision: v2.1.22
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132 |
// It wasn't dynamic, so returning the static value. |
04becd199f91
Revision: v2.1.22
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133 |
return propertyValueStr; |
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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134 |
} |
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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135 |
catch (Throwable t) |
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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diff
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136 |
{ |
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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diff
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|
137 |
Logger.ELOG(Logger.EUtils, "Error in system properties: Key=" |
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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|
138 |
+ propertyNameStr + ", Val ='" + |
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
139 |
propertyValueStr, t); |
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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140 |
return ""; |
04becd199f91
Revision: v2.1.22
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parents:
diff
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|
141 |
} |
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
142 |
} |
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
143 |
} |
04becd199f91
Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
144 |