/
EmbedRubyInterfaceAdapterImpl.java
78 lines (72 loc) · 3.26 KB
/
EmbedRubyInterfaceAdapterImpl.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
/**
* **** BEGIN LICENSE BLOCK *****
* Version: EPL 2.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Eclipse Public
* 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.eclipse.org/legal/epl-v20.html
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* Copyright (C) 2009 Yoko Harada <yokolet@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the EPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the EPL, the GPL or the LGPL.
* **** END LICENSE BLOCK *****
*/
package org.jruby.embed.internal;
import org.jruby.Ruby;
import org.jruby.RubyNil;
import org.jruby.embed.EmbedRubyInterfaceAdapter;
import org.jruby.embed.ScriptingContainer;
import org.jruby.javasupport.JavaEmbedUtils;
import org.jruby.javasupport.JavaUtil;
import org.jruby.runtime.builtin.IRubyObject;
/**
* The implementation of {@link EmbedRubyInterfaceAdapter} and implements the
* method that gets a instance of requested interface, which is implemented in Ruby.
*
* @author Yoko Harada <yokolet@gmail.com>
*/
public class EmbedRubyInterfaceAdapterImpl implements EmbedRubyInterfaceAdapter {
private final ScriptingContainer container;
public EmbedRubyInterfaceAdapterImpl(ScriptingContainer container) {
this.container = container;
}
/**
* Returns a instance of a requested interface type from a previously evaluated script.
*
* @param receiver a receiver of the previously evaluated script.
* @param clazz an interface type of the returning instance.
* @return an instance of requested interface type.
*/
public <T> T getInstance(Object receiver, Class<T> clazz) {
if (clazz == null || !clazz.isInterface()) {
return null;
}
final Ruby runtime = container.getProvider().getRuntime();
final Object obj;
if (receiver == null || receiver instanceof RubyNil) {
obj = JavaEmbedUtils.rubyToJava(runtime, runtime.getTopSelf(), clazz);
} else if (receiver instanceof IRubyObject) {
obj = JavaEmbedUtils.rubyToJava(runtime, (IRubyObject) receiver, clazz);
} else {
IRubyObject rubyReceiver = JavaUtil.convertJavaToRuby(runtime, receiver);
obj = JavaEmbedUtils.rubyToJava(runtime, rubyReceiver, clazz);
}
return clazz.cast(obj);
}
}