001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied. See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019
020package org.apache.bytecode;
021
022import java.lang.reflect.Method;
023import java.util.HashMap;
024
025public class MethodTable {
026
027    private HashMap nameToMethodMap;
028    private ChainedParamReader cpr;
029
030    public MethodTable(Class cls) throws Exception {
031        cpr = new ChainedParamReader(cls);
032        nameToMethodMap = new HashMap();
033        loadMethods(cls);
034    }
035
036    /**
037     * To load all the methods in the given class by Java reflection
038     *
039     * @param cls
040     * @throws Exception
041     */
042    private void loadMethods(Class cls) throws Exception {
043        Method [] methods = cls.getMethods();
044        for (int i = 0; i < methods.length; i++) {
045            Method method = methods[i];
046            if (method.isBridge()) {
047                continue;
048            }
049            nameToMethodMap.put(method.getName(), method);
050        }
051    }
052
053    public String [] getParameterNames(String methodName) {
054        Method method = (Method) nameToMethodMap.get(methodName);
055        if (method == null) {
056            return null;
057        }
058        return cpr.getParameterNames(method);
059    }
060
061
062}