Home | History | Annotate | Download | only in lang 
      1 /*
      2  * Licensed to the Apache Software Foundation (ASF) under one or more
      3  * contributor license agreements.  See the NOTICE file distributed with
      4  * this work for additional information regarding copyright ownership.
      5  * The ASF licenses this file to You under the Apache License, Version 2.0
      6  * (the "License"); you may not use this file except in compliance with
      7  * the License.  You may obtain a copy of the License at
      8  *
      9  *     http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  * Unless required by applicable law or agreed to in writing, software
     12  * distributed under the License is distributed on an "AS IS" BASIS,
     13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  * See the License for the specific language governing permissions and
     15  * limitations under the License.
     16  */
     17 /*
     18  * Copyright (C) 2016 The Android Open Source Project
     19  *
     20  * Licensed under the Apache License, Version 2.0 (the "License");
     21  * you may not use this file except in compliance with the License.
     22  * You may obtain a copy of the License at
     23  *
     24  *      http://www.apache.org/licenses/LICENSE-2.0
     25  *
     26  * Unless required by applicable law or agreed to in writing, software
     27  * distributed under the License is distributed on an "AS IS" BASIS,
     28  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     29  * See the License for the specific language governing permissions and
     30  * limitations under the License.
     31  */
     32 
     33 package java.lang;
     34 
     35 import java.util.Properties;
     36 
     37 /**
     38  * A class encoding all hardcoded system property values on Android. A compiler may
     39  * take advantage of these properties. Changing them at load-time (-D) or runtime
     40  * may not have any effect.
     41  *
     42  * @hide
     43  */
     44 public final class AndroidHardcodedSystemProperties {
     45 
     46     // This value is shared with sun.misc.Version. It is defined here so that the compiler
     47     // can use it.
     48     public final static String JAVA_VERSION = "0";
     49 
     50     final static String[][] STATIC_PROPERTIES = {
     51         // None of these four are meaningful on Android, but these keys are guaranteed
     52         // to be present for System.getProperty. For java.class.version, we use the maximum
     53         // class file version that dx currently supports.
     54         { "java.class.version", "50.0" },
     55         { "java.version", JAVA_VERSION },
     56         { "java.compiler", "" },
     57         { "java.ext.dirs", "" },
     58 
     59         { "java.specification.name", "Dalvik Core Library" },
     60         { "java.specification.vendor", "The Android Project" },
     61         { "java.specification.version", "0.9" },
     62 
     63         { "java.vendor", "The Android Project" },
     64         { "java.vendor.url", "http://www.android.com/" },
     65         { "java.vm.name", "Dalvik" },
     66         { "java.vm.specification.name", "Dalvik Virtual Machine Specification" },
     67         { "java.vm.specification.vendor", "The Android Project" },
     68         { "java.vm.specification.version", "0.9" },
     69         { "java.vm.vendor", "The Android Project" },
     70 
     71         { "java.vm.vendor.url", "http://www.android.com/" },
     72 
     73         { "java.net.preferIPv6Addresses", "false" },
     74 
     75         { "file.encoding", "UTF-8" },
     76 
     77         { "file.separator", "/" },
     78         { "line.separator", "\n" },
     79         { "path.separator", ":" },
     80 
     81         // Turn off ICU debugging. This allows compile-time initialization of a range of
     82         // classes. b/28039175
     83         { "ICUDebug", null },
     84 
     85         // Hardcode DecimalFormat parsing flag to be default. b/27265238
     86         { "android.icu.text.DecimalFormat.SkipExtendedSeparatorParsing", null },
     87         // Hardcode MessagePattern apostrophe mode to be default. b/27265238
     88         { "android.icu.text.MessagePattern.ApostropheMode", null },
     89 
     90         // Hardcode "sun.io.useCanonCaches" to use the default (off). b/28174137, b/62301183
     91         { "sun.io.useCanonCaches", null },
     92         { "sun.io.useCanonPrefixCache", null },
     93 
     94         // Hardcode some http properties to use the default. b/28174137
     95         { "http.keepAlive", null },
     96         { "http.keepAliveDuration", null },
     97         { "http.maxConnections", null },
     98 
     99         // Hardcode "os.name" to "Linux." Aids compile-time initialization, checked in System.
    100         // b/28174137
    101         { "os.name", "Linux" },
    102 
    103         // Turn off javax.net debugging. This allows compile-time initialization of a range
    104         // of classes. b/28174137
    105         { "javax.net.debug", null },
    106 
    107         // Hardcode default value for AVA. b/28174137
    108         { "com.sun.security.preserveOldDCEncoding", null },
    109 
    110         // Hardcode default value for LogManager. b/28174137
    111         { "java.util.logging.manager", null },
    112     };
    113 }
    114