jaroslav@717: /**
jaroslav@717:  * Back 2 Browser Bytecode Translator
jaroslav@717:  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
jaroslav@717:  *
jaroslav@717:  * This program is free software: you can redistribute it and/or modify
jaroslav@717:  * it under the terms of the GNU General Public License as published by
jaroslav@717:  * the Free Software Foundation, version 2 of the License.
jaroslav@717:  *
jaroslav@717:  * This program is distributed in the hope that it will be useful,
jaroslav@717:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
jaroslav@717:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
jaroslav@717:  * GNU General Public License for more details.
jaroslav@717:  *
jaroslav@717:  * You should have received a copy of the GNU General Public License
jaroslav@717:  * along with this program. Look for COPYING file in the top folder.
jaroslav@717:  * If not, see http://opensource.org/licenses/GPL-2.0.
jaroslav@717:  */
jaroslav@717: package org.apidesign.bck2brwsr.ide.editor;
jaroslav@717: 
jaroslav@717: import java.lang.reflect.Method;
jaroslav@717: import java.util.HashMap;
jaroslav@717: import java.util.Map;
jaroslav@717: 
jaroslav@717: /**
jaroslav@717:  * JNI Helper.
jaroslav@717:  * To facilitate lookup of methods by name and signature, instead of manually parsing signatures,
jaroslav@717:  * constructs the map of all methods and uses Class.getName() to generate almost-correct signatures.
jaroslav@717:  */
jaroslav@717: public class JNIHelper {
jaroslav@717: 
jaroslav@717:     static Method method(String clazz, String method, String signature) {
jaroslav@717:         final Map<String, Method> methods = methodMap(JNIHelper.clazz(clazz));
jaroslav@717:         return methods.get(methodKey(method, signature));
jaroslav@717:     }
jaroslav@717: 
jaroslav@717:     static Class<?> clazz(String clazz) {
jaroslav@717:         try {
jaroslav@717:             return Class.forName(clazz);
jaroslav@717:         } catch (ClassNotFoundException e) {
jaroslav@717:             throw new IllegalArgumentException(e);
jaroslav@717:         }
jaroslav@717:     }
jaroslav@717: 
jaroslav@717:     static Map<String, Method> methodMap(final Class<?> clazz) {
jaroslav@717:         final Map<String, Method> map = new HashMap<String, Method>();
jaroslav@717:         final Method[] methods = clazz.getDeclaredMethods();
jaroslav@717:         for (int i = 0; i < methods.length; i++) {
jaroslav@717:             final Method method = methods[i];
jaroslav@717:             map.put(methodKey(method.getName(), signature(method)), method);
jaroslav@717:         }
jaroslav@717:         return map;
jaroslav@717:     }
jaroslav@717: 
jaroslav@717:     static String methodKey(String method, String signature) {
jaroslav@717:         return method + '@' + signature;
jaroslav@717:     }
jaroslav@717: 
jaroslav@717:     static String signature(final Method method) {
jaroslav@717:         final Class<?>[] parameterTypes = method.getParameterTypes();
jaroslav@717:         final StringBuilder b = new StringBuilder();
jaroslav@717:         for (int j = 0; j < parameterTypes.length; j++) {
jaroslav@717:             b.append(signature(parameterTypes[j]));
jaroslav@717:         }
jaroslav@717:         return b.toString();
jaroslav@717:     }
jaroslav@717: 
jaroslav@717:     static String signature(final Class<?> clazz) {
jaroslav@717:         if (clazz == boolean.class) return "Z";
jaroslav@717:         else if (clazz == byte.class) return "B";
jaroslav@717:         else if (clazz == char.class) return "C";
jaroslav@717:         else if (clazz == double.class) return "D";
jaroslav@717:         else if (clazz == float.class) return "F";
jaroslav@717:         else if (clazz == int.class) return "I";
jaroslav@717:         else if (clazz == long.class) return "J";
jaroslav@717:         else if (clazz == short.class) return "S";
jaroslav@717:         else if (clazz == void.class) return "V";
jaroslav@717:         else if (clazz.isArray()) return clazz.getName().replace('.','/');
jaroslav@717:         else return "L" + clazz.getName().replace('.','/') + ";";
jaroslav@717:     }
jaroslav@717: }