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lmdbjava/src/main/java/org/lmdbjava/TargetName.java at master · lmdbjava/lmdbjava · GitHub
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TargetName.java
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/*
* Copyright © 2016-2025 The LmdbJava Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package
org
.
lmdbjava
;
import
static
java
.
lang
.
System
.
getProperty
;
import
static
java
.
util
.
Locale
.
ENGLISH
;
import
java
.
io
.
IOException
;
import
java
.
nio
.
file
.
Files
;
import
java
.
nio
.
file
.
Paths
;
import
java
.
util
.
stream
.
Stream
;
/**
* Determines the name of the target LMDB native library.
*
* <p>Users will typically use an LMDB native library that is embedded within the LmdbJava JAR.
* Embedded libraries are built by a Zig cross-compilation step as part of the release process. The
* naming convention reflects the Zig target name plus a common filename extension. This simplifies
* support for future Zig targets (eg with different toolchains etc).
*
* <p>Users can set two system properties to override the automatic resolution of an embedded
* library. Setting {@link #LMDB_NATIVE_LIB_PROP} will force use of that external LMDB library.
* Setting {@link #LMDB_EMBEDDED_LIB_PROP} will force use of that embedded LMDB library. If both are
* set, the former property will take precedence. Most users do not need to set either property.
*/
public
final
class
TargetName
{
/**
* True if the resolved native filename is an external file (conversely false indicates the file
* should be considered a classpath resource).
*/
public
static
final
boolean
IS_EXTERNAL
;
/**
* Java system property name that can be set to override the embedded library that will be used.
* This is likely to be required if automatic resolution fails but the user still prefers to use
* an LmdbJava-bundled library. This path must include the classpath prefix (usually <code>
* org/lmdbjava/native</code>).
*/
public
static
final
String
LMDB_EMBEDDED_LIB_PROP
=
"lmdbjava.embedded.lib"
;
/**
* Java system property name that can be set to provide a custom path to an external LMDB system
* library.
*/
public
static
final
String
LMDB_NATIVE_LIB_PROP
=
"lmdbjava.native.lib"
;
/** Resolved target native filename or fully-qualified classpath location. */
public
static
final
String
RESOLVED_FILENAME
;
private
static
final
String
ARCH
=
getProperty
(
"os.arch"
);
private
static
final
String
EMBED
=
getProperty
(
LMDB_EMBEDDED_LIB_PROP
);
private
static
final
String
EXTERNAL
=
getProperty
(
LMDB_NATIVE_LIB_PROP
);
private
static
final
String
OS
=
getProperty
(
"os.name"
);
static
{
IS_EXTERNAL
=
isExternal
(
EXTERNAL
);
RESOLVED_FILENAME
=
resolveFilename
(
EXTERNAL
,
EMBED
,
ARCH
,
OS
);
}
private
TargetName
() {}
/**
* Resolves the filename extension of the bundled LMDB library for a given operating system.
*
* @param os typically the <code>os.name</code> system property
* @return extension of the LMDB system library bundled with LmdbJava
*/
public
static
String
resolveExtension
(
final
String
os
) {
return
check
(
os
,
"Windows"
) ?
"dll"
:
"so"
;
}
static
boolean
isExternal
(
final
String
external
) {
return
external
!=
null
&& !
external
.
isEmpty
();
}
static
String
resolveFilename
(
final
String
external
,
final
String
embed
,
final
String
arch
,
final
String
os
) {
if
(
external
!=
null
&& !
external
.
isEmpty
()) {
return
external
;
}
if
(
embed
!=
null
&& !
embed
.
isEmpty
()) {
return
embed
;
}
final
String
pkg
=
TargetName
.
class
.
getPackage
().
getName
().
replace
(
'.'
,
'/'
);
return
pkg
+
"/native/"
+
resolveArch
(
arch
)
+
"-"
+
resolveOs
(
os
)
+
"-"
+
resolveToolchain
(
os
)
+
"."
+
resolveExtension
(
os
);
}
/**
* Case insensitively checks whether the passed string starts with any of the candidate strings.
*
* @param string the string being checked
* @param candidates one or more candidate strings
* @return true if the string starts with any of the candidates
*/
private
static
boolean
check
(
final
String
string
,
final
String
...
candidates
) {
if
(
string
==
null
) {
return
false
;
}
final
String
strLower
=
string
.
toLowerCase
(
ENGLISH
);
for
(
final
String
c
:
candidates
) {
if
(
strLower
.
startsWith
(
c
.
toLowerCase
(
ENGLISH
))) {
return
true
;
}
}
return
false
;
}
private
static
String
err
(
final
String
reason
) {
return
reason
+
" (please set system property "
+
LMDB_NATIVE_LIB_PROP
+
" to the path of an external LMDB native library,"
+
" or simply 'lmdb' if LMDB is installed in standard system paths;"
+
" alternatively set property "
+
LMDB_EMBEDDED_LIB_PROP
+
" to the name of an LmdbJava embedded library;"
+
" os.arch='"
+
ARCH
+
"' os.name='"
+
OS
+
"')"
;
}
private
static
String
resolveArch
(
final
String
arch
) {
if
(
check
(
arch
,
"aarch64"
)) {
return
"aarch64"
;
}
else
if
(
check
(
arch
,
"x86_64"
,
"amd64"
)) {
return
"x86_64"
;
}
throw
new
UnsupportedOperationException
(
err
(
"Unsupported os.arch"
));
}
private
static
String
resolveOs
(
final
String
os
) {
if
(
check
(
os
,
"Linux"
)) {
return
"linux"
;
}
else
if
(
check
(
os
,
"Mac OS"
)) {
return
"macos"
;
}
else
if
(
check
(
os
,
"Windows"
)) {
return
"windows"
;
}
throw
new
UnsupportedOperationException
(
err
(
"Unsupported os.name"
));
}
private
static
String
resolveToolchain
(
final
String
os
) {
if
(
check
(
os
,
"Mac OS"
)) {
return
"none"
;
}
return
isMuslLibc
() ?
"musl"
:
"gnu"
;
}
private
static
boolean
isMuslLibc
() {
try
(
Stream
<
String
>
lines
=
Files
.
lines
(
Paths
.
get
(
"/proc/self/maps"
))) {
return
lines
.
anyMatch
(
line
->
line
.
contains
(
"/ld-musl"
));
}
catch
(
final
IOException
e
) {
return
false
;
}
}
}
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