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rJava/src/java/RJavaImport.java at master · s-u/rJava · GitHub
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RJavaImport.java
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RJavaImport.java
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import
java
.
util
.
regex
.
Pattern
;
import
java
.
util
.
regex
.
Matcher
;
import
java
.
util
.
Vector
;
import
java
.
util
.
HashMap
;
import
java
.
util
.
Map
;
import
java
.
util
.
Collection
;
import
java
.
util
.
Set
;
import
java
.
util
.
Iterator
;
import
java
.
io
.
Serializable
;
/**
* Utilities to manage java packages and how they are "imported" to R
* databases. This is the back door of the <code>javaImport</code>
* system in the R side
*
* @author Romain Francois <francoisromain@free.fr>
*/
public
class
RJavaImport
implements
Serializable
{
/**
* Debug flag. Prints some messages if it is set to TRUE
*/
public
static
boolean
DEBUG
=
false
;
/**
* list of imported packages
*/
/* TODO: vector is not good enough, we need to control the order
in which the packages appear */
private
Vector
/*<String>*/
importedPackages
;
/**
* maps a simple name to a fully qualified name
*/
/* String -> java.lang.String */
/* should we cache the Class instead ? */
private
Map
/*<String,String>*/
cache
;
/**
* associated class loader
*/
public
ClassLoader
loader
;
/**
* Constructor. Initializes the imported package vector and the cache
*/
public
RJavaImport
(
ClassLoader
loader
){
this
.
loader
=
loader
;
importedPackages
=
new
Vector
/*<String>*/
();
cache
=
new
HashMap
/*<String,String>*/
() ;
}
/**
* Look for the class in the set of packages
*
* @param clazz the simple class name
*
* @return an instance of Class representing the actual class
*/
public
Class
lookup
(
String
clazz
){
Class
res
=
lookup_
(
clazz
) ;
if
(
DEBUG
)
System
.
out
.
println
(
" [J] lookup( '"
+
clazz
+
"' ) = "
+ (
res
==
null
?
" "
: (
"'"
+
res
.
getName
() +
"'"
) ) ) ;
return
res
;
}
private
Class
lookup_
(
String
clazz
){
Class
res
=
null
;
if
(
cache
.
containsKey
(
clazz
) ){
try
{
String
fullname
= (
String
)
cache
.
get
(
clazz
) ;
Class
cl
=
Class
.
forName
(
fullname
) ;
return
cl
;
}
catch
(
Exception
e
){
/* does not happen */
}
}
/* first try to see if the class does not exist verbatim */
try
{
res
=
Class
.
forName
(
clazz
) ;
}
catch
(
Exception
e
){}
if
(
res
!=
null
) {
cache
.
put
(
clazz
,
clazz
) ;
return
res
;
}
int
npacks
=
importedPackages
.
size
() ;
if
(
DEBUG
)
System
.
out
.
println
(
" [J] "
+
npacks
+
" packages"
) ;
if
(
npacks
>
0
){
for
(
int
i
=
0
;
i
<
npacks
;
i
++){
try
{
String
p
= (
String
)
importedPackages
.
get
(
i
);
String
candidate
=
p
+
"."
+
clazz
;
if
(
DEBUG
)
System
.
out
.
println
(
" [J] trying class : "
+
candidate
) ;
res
=
Class
.
forName
(
candidate
) ;
}
catch
(
Exception
e
){
if
(
DEBUG
)
System
.
out
.
println
(
" [JE] "
+
e
.
getMessage
() );
}
if
(
res
!=
null
){
cache
.
put
(
clazz
,
res
.
getName
() ) ;
return
res
;
}
}
}
return
null
;
}
/**
* @return true if the class is known
*/
public
boolean
exists
(
String
clazz
){
boolean
res
=
exists_
(
clazz
) ;
if
(
DEBUG
)
System
.
out
.
println
(
" [J] exists( '"
+
clazz
+
"' ) = "
+
res
) ;
return
res
;
}
public
boolean
exists_
(
String
clazz
){
if
(
cache
.
containsKey
(
clazz
) )
return
true
;
return
(
lookup_
(
clazz
) !=
null
);
}
/**
* Adds a package to the list of "imported" packages
*
* @param packageName package path name
*/
public
void
importPackage
(
String
packageName
){
importedPackages
.
add
(
packageName
) ;
}
/**
* Adds a set of packages
*
* @param packages package path names
*/
public
void
importPackage
(
String
[]
packages
){
for
(
int
i
=
0
;
i
<
packages
.
length
;
i
++){
importPackage
(
packages
[
i
] ) ;
}
}
/**
* @return the simple names of the classes currently known
* by this importer
*/
public
String
[]
getKnownClasses
(){
Set
/*<String>*/
set
=
cache
.
keySet
() ;
int
size
=
set
.
size
() ;
String
[]
res
=
new
String
[
size
];
set
.
toArray
(
res
);
if
(
DEBUG
)
System
.
out
.
println
(
" [J] getKnownClasses().length = "
+
res
.
length
) ;
return
res
;
}
public
static
Class
lookup
(
String
clazz
,
Set
importers
){
Class
res
;
Iterator
iterator
=
importers
.
iterator
() ;
while
(
iterator
.
hasNext
()){
RJavaImport
importer
= (
RJavaImport
)
iterator
.
next
() ;
res
=
importer
.
lookup
(
clazz
) ;
if
(
res
!=
null
)
return
res
;
}
return
null
;
}
}
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