1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/ide/editor/src/main/java/org/apidesign/bck2brwsr/ide/editor/JNIHelper.java	Wed Feb 13 12:08:00 2013 +0100
     1.3 @@ -0,0 +1,80 @@
     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.ide.editor;
    1.22 +
    1.23 +import java.lang.reflect.Method;
    1.24 +import java.util.HashMap;
    1.25 +import java.util.Map;
    1.26 +
    1.27 +/**
    1.28 + * JNI Helper.
    1.29 + * To facilitate lookup of methods by name and signature, instead of manually parsing signatures,
    1.30 + * constructs the map of all methods and uses Class.getName() to generate almost-correct signatures.
    1.31 + */
    1.32 +public class JNIHelper {
    1.33 +
    1.34 +    static Method method(String clazz, String method, String signature) {
    1.35 +        final Map<String, Method> methods = methodMap(JNIHelper.clazz(clazz));
    1.36 +        return methods.get(methodKey(method, signature));
    1.37 +    }
    1.38 +
    1.39 +    static Class<?> clazz(String clazz) {
    1.40 +        try {
    1.41 +            return Class.forName(clazz);
    1.42 +        } catch (ClassNotFoundException e) {
    1.43 +            throw new IllegalArgumentException(e);
    1.44 +        }
    1.45 +    }
    1.46 +
    1.47 +    static Map<String, Method> methodMap(final Class<?> clazz) {
    1.48 +        final Map<String, Method> map = new HashMap<String, Method>();
    1.49 +        final Method[] methods = clazz.getDeclaredMethods();
    1.50 +        for (int i = 0; i < methods.length; i++) {
    1.51 +            final Method method = methods[i];
    1.52 +            map.put(methodKey(method.getName(), signature(method)), method);
    1.53 +        }
    1.54 +        return map;
    1.55 +    }
    1.56 +
    1.57 +    static String methodKey(String method, String signature) {
    1.58 +        return method + '@' + signature;
    1.59 +    }
    1.60 +
    1.61 +    static String signature(final Method method) {
    1.62 +        final Class<?>[] parameterTypes = method.getParameterTypes();
    1.63 +        final StringBuilder b = new StringBuilder();
    1.64 +        for (int j = 0; j < parameterTypes.length; j++) {
    1.65 +            b.append(signature(parameterTypes[j]));
    1.66 +        }
    1.67 +        return b.toString();
    1.68 +    }
    1.69 +
    1.70 +    static String signature(final Class<?> clazz) {
    1.71 +        if (clazz == boolean.class) return "Z";
    1.72 +        else if (clazz == byte.class) return "B";
    1.73 +        else if (clazz == char.class) return "C";
    1.74 +        else if (clazz == double.class) return "D";
    1.75 +        else if (clazz == float.class) return "F";
    1.76 +        else if (clazz == int.class) return "I";
    1.77 +        else if (clazz == long.class) return "J";
    1.78 +        else if (clazz == short.class) return "S";
    1.79 +        else if (clazz == void.class) return "V";
    1.80 +        else if (clazz.isArray()) return clazz.getName().replace('.','/');
    1.81 +        else return "L" + clazz.getName().replace('.','/') + ";";
    1.82 +    }
    1.83 +}