rt/emul/mini/src/main/java/org/apidesign/bck2brwsr/emul/reflect/AnnotationImpl.java
1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/rt/emul/mini/src/main/java/org/apidesign/bck2brwsr/emul/reflect/AnnotationImpl.java Tue Feb 26 16:54:16 2013 +0100
1.3 @@ -0,0 +1,130 @@
1.4 +/**
1.5 + * Back 2 Browser Bytecode Translator
1.6 + * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
1.7 + *
1.8 + * This program is free software: you can redistribute it and/or modify
1.9 + * it under the terms of the GNU General Public License as published by
1.10 + * the Free Software Foundation, version 2 of the License.
1.11 + *
1.12 + * This program is distributed in the hope that it will be useful,
1.13 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1.14 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.15 + * GNU General Public License for more details.
1.16 + *
1.17 + * You should have received a copy of the GNU General Public License
1.18 + * along with this program. Look for COPYING file in the top folder.
1.19 + * If not, see http://opensource.org/licenses/GPL-2.0.
1.20 + */
1.21 +package org.apidesign.bck2brwsr.emul.reflect;
1.22 +
1.23 +import java.lang.annotation.Annotation;
1.24 +import java.lang.reflect.Method;
1.25 +import java.lang.reflect.Modifier;
1.26 +import org.apidesign.bck2brwsr.core.JavaScriptBody;
1.27 +
1.28 +/**
1.29 + *
1.30 + * @author Jaroslav Tulach <jtulach@netbeans.org>
1.31 + */
1.32 +public final class AnnotationImpl implements Annotation {
1.33 + private final Class<? extends Annotation> type;
1.34 +
1.35 + public AnnotationImpl(Class<? extends Annotation> type) {
1.36 + this.type = type;
1.37 + }
1.38 +
1.39 + public Class<? extends Annotation> annotationType() {
1.40 + return type;
1.41 + }
1.42 +
1.43 + @JavaScriptBody(args = { "a", "n", "arr", "values" }, body = ""
1.44 + + "function f(val, prop, clazz) {\n"
1.45 + + " return function() {\n"
1.46 + + " if (clazz == null) return val[prop];\n"
1.47 + + " if (clazz.isArray__Z()) {\n"
1.48 + + " var valarr = val[prop];\n"
1.49 + + " var cmp = clazz.getComponentType__Ljava_lang_Class_2();\n"
1.50 + + " var retarr = vm.java_lang_reflect_Array(false).newInstance__Ljava_lang_Object_2Ljava_lang_Class_2I(cmp, valarr.length);\n"
1.51 + + " for (var i = 0; i < valarr.length; i++) {\n"
1.52 + + " retarr[i] = CLS.prototype.c__Ljava_lang_Object_2Ljava_lang_Class_2Ljava_lang_Object_2(cmp, valarr[i]);\n"
1.53 + + " }\n"
1.54 + + " return retarr;\n"
1.55 + + " }\n"
1.56 + + " return CLS.prototype.c__Ljava_lang_Object_2Ljava_lang_Class_2Ljava_lang_Object_2(clazz, val[prop]);\n"
1.57 + + " };\n"
1.58 + + "}\n"
1.59 + + "for (var i = 0; i < arr.length; i += 3) {\n"
1.60 + + " var m = arr[i];\n"
1.61 + + " var p = arr[i + 1];\n"
1.62 + + " var c = arr[i + 2];\n"
1.63 + + " a[m] = f(values, p, c);\n"
1.64 + + "}\n"
1.65 + + "a['$instOf_' + n] = true;\n"
1.66 + + "return a;"
1.67 + )
1.68 + private static native <T extends Annotation> T create(
1.69 + AnnotationImpl a, String n, Object[] methodsAndProps, Object values
1.70 + );
1.71 +
1.72 + private static Object c(Class<? extends Annotation> a, Object v) {
1.73 + return create(a, v);
1.74 + }
1.75 +
1.76 + public static <T extends Annotation> T create(Class<T> annoClass, Object values) {
1.77 + return create(new AnnotationImpl(annoClass),
1.78 + annoClass.getName().replace('.', '_'),
1.79 + findProps(annoClass), values
1.80 + );
1.81 + }
1.82 +
1.83 + public static Annotation[] create(Object anno) {
1.84 + String[] names = findNames(anno);
1.85 + Annotation[] ret = new Annotation[names.length];
1.86 + for (int i = 0; i < names.length; i++) {
1.87 + String annoNameSlash = names[i].substring(1, names[i].length() - 1);
1.88 + Class<? extends Annotation> annoClass;
1.89 + try {
1.90 + annoClass = (Class<? extends Annotation>)Class.forName(annoNameSlash.replace('/', '.'));
1.91 + } catch (ClassNotFoundException ex) {
1.92 + throw new IllegalStateException("Can't find annotation class " + annoNameSlash);
1.93 + }
1.94 + ret[i] = create(
1.95 + new AnnotationImpl(annoClass),
1.96 + annoNameSlash.replace('/', '_'),
1.97 + findProps(annoClass),
1.98 + findData(anno, names[i])
1.99 + );
1.100 + }
1.101 + return ret;
1.102 + }
1.103 + @JavaScriptBody(args = "anno", body =
1.104 + "var arr = new Array();"
1.105 + + "var props = Object.getOwnPropertyNames(anno);\n"
1.106 + + "for (var i = 0; i < props.length; i++) {\n"
1.107 + + " var p = props[i];\n"
1.108 + + " arr.push(p);"
1.109 + + "}"
1.110 + + "return arr;"
1.111 + )
1.112 + private static native String[] findNames(Object anno);
1.113 +
1.114 + @JavaScriptBody(args={ "anno", "p"}, body="return anno[p];")
1.115 + private static native Object findData(Object anno, String p);
1.116 +
1.117 + private static Object[] findProps(Class<?> annoClass) {
1.118 + final Method[] marr = MethodImpl.findMethods(annoClass, Modifier.PUBLIC);
1.119 + Object[] arr = new Object[marr.length * 3];
1.120 + int pos = 0;
1.121 + for (Method m : marr) {
1.122 + arr[pos++] = MethodImpl.toSignature(m);
1.123 + arr[pos++] = m.getName();
1.124 + final Class<?> rt = m.getReturnType();
1.125 + if (rt.isArray()) {
1.126 + arr[pos++] = rt.getComponentType().isAnnotation() ? rt : null;
1.127 + } else {
1.128 + arr[pos++] = rt.isAnnotation() ? rt : null;
1.129 + }
1.130 + }
1.131 + return arr;
1.132 + }
1.133 +}