|
1
9
10 package org.nanocontainer.script.jruby;
11
12 import java.io.IOException  ;
13 import java.io.Reader ;
14 import java.io.StringWriter ;
15 import java.util.Collections ;
16
17 import org.jruby.IRuby;
18 import org.jruby.exceptions.RaiseException;
19 import org.jruby.javasupport.JavaEmbedUtils;
20 import org.jruby.runtime.builtin.IRubyObject;
21 import org.nanocontainer.integrationkit.PicoCompositionException;
22 import org.nanocontainer.reflection.DefaultNanoPicoContainer;
23 import org.nanocontainer.script.NanoContainerMarkupException;
24 import org.nanocontainer.script.ScriptedContainerBuilder;
25 import org.picocontainer.PicoContainer;
26 import org.picocontainer.alternatives.EmptyPicoContainer;
27
28
35 public class JRubyContainerBuilder extends ScriptedContainerBuilder {
36 public static final String MARKUP_EXCEPTION_PREFIX = "nanobuilder: ";
37
38 private String script;
39
40 public JRubyContainerBuilder(Reader script, ClassLoader classLoader) {
41 super(script, classLoader);
42 this.script = toString( script );
43 }
44
45 private String toString(Reader script) {
46 int charsRead;
47 char[] chars = new char[1024];
48 StringWriter writer = new StringWriter ();
49 try {
50 while ((charsRead = script.read(chars)) != -1) {
51 writer.write(chars, 0, charsRead);
52 }
53 } catch (IOException e) {
54 throw new RuntimeException ("unable to read script from reader", e);
55 }
56 return writer.toString();
57 }
58
59 protected PicoContainer createContainerFromScript(PicoContainer parentContainer, Object assemblyScope) {
60 if (parentContainer == null) {
61 parentContainer = new EmptyPicoContainer();
62 }
63 parentContainer = new DefaultNanoPicoContainer(getClassLoader(), parentContainer);
64
65 IRuby ruby = JavaEmbedUtils.initialize(Collections.EMPTY_LIST);
66 ruby.getLoadService().require("org/nanocontainer/script/jruby/nanobuilder");
67 ruby.defineReadonlyVariable("$parent", JavaEmbedUtils.javaToRuby(ruby, parentContainer));
68 ruby.defineReadonlyVariable("$assembly_scope", JavaEmbedUtils.javaToRuby(ruby, assemblyScope));
69 try {
70 IRubyObject result = ruby.evalScript(script);
71 return (PicoContainer) JavaEmbedUtils.rubyToJava(ruby, result, PicoContainer.class);
72 } catch (RaiseException re) {
73 if (re.getCause() instanceof NanoContainerMarkupException) {
74 throw (NanoContainerMarkupException) re.getCause();
75 }
76 String message = (String ) JavaEmbedUtils.rubyToJava(ruby, re.getException().message, String .class);
77 if (message.startsWith(MARKUP_EXCEPTION_PREFIX)) {
78 throw new NanoContainerMarkupException(message.substring(MARKUP_EXCEPTION_PREFIX.length()));
79 } else {
80 throw new PicoCompositionException(message, re);
81 }
82 }
83 }
84 }
85 |
Popular Tags |
Java API By Example, From Geeks To Geeks.